Q1
BIOLOGY
Unit 6: Reproduction
Offsets are produced by
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Parthenocarpy
- B. Parthenogenesis
- C. Mitotic divisions
- D. Meiotic divisions
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Q2
BIOLOGY
Unit 7: Genetics and Evolution
The experimental proof for semiconservative replication of DNA was first shown in a
↻ Repeated question — also appeared in
2018 (13 sets)
- A. Plant
- B. Virus
- C. Bacterium
- D. Fungus
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Q3
BIOLOGY
Unit 7: Genetics and Evolution
Select the correct match:
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Matthew Meselson and F. Stahl – Pisum sativum
- B. Francois Jacob and Jacques Monod – Lac operon
- C. Alfred Hershey and Martha Chase – TMV
- D. Alec Jeffreys – Streptococcus pneumoniae
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Q4
BIOLOGY
Unit 7: Genetics and Evolution
Which of the following pairs is wrongly matched?
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2018 (15 sets)
- A. XO type sex determination – Grasshopper
- B. T.H. Morgan – Linkage
- C. ABO blood grouping – Co-dominance
- D. Starch synthesis in pea – Multiple alleles
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Q5
BIOLOGY
Unit 7: Genetics and Evolution
Select the correct statement:
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Spliceosomes take part in translation.
- B. Transduction was discovered by S. Altman.
- C. Punnett square was developed by a British scientist.
- D. Franklin Stahl coined the term linkage.
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Q6
BIOLOGY
Unit 1: Diversity in Living World
Which of the following has proved helpful in preserving pollen as fossils?
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2018 (3 sets)
- A. Oil content
- B. Sporopollenin
- C. Cellulosic intine
- D. Pollenkitt
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Q7
BIOLOGY
Unit 6: Reproduction
Which of the following flowers only once in its life-time?
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2018 (15 sets)
- A. Mango
- B. Papaya
- C. Jackfruit
- D. Bamboo species
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Q8
BIOLOGY
Unit 9: Biotechnology and Its Applications
The correct order of steps in Polymerase Chain Reaction (PCR) is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Denaturation, Extension, Annealing
- B. Denaturation, Annealing, Extension
- C. Annealing, Extension, Denaturation
- D. Extension, Denaturation, Annealing
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Q9
BIOLOGY
Unit 9: Biotechnology and Its Applications
In India, the organisation responsible for assessing the safety of introducing genetically modified organisms for public use is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Research Committee on Genetic Manipulation (RCGM)
- B. Genetic Engineering Appraisal Committee (GEAC)
- C. Council for Scientific and Industrial Research (CSIR)
- D. Indian Council of Medical Research (ICMR)
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Q9
BIOLOGY
Unit 10: Ecology and Environment
In India, the organisation responsible for assessing the safety of introducing genetically modified organisms for public use is
- A. Research Committee on Genetic Manipulation (RCGM)
- B. Genetic Engineering Appraisal Committee (GEAC)
- C. Council for Scientific and Industrial Research (CSIR)
- D. Indian Council of Medical Research (ICMR)
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Q10
BIOLOGY
Unit 9: Biotechnology and Its Applications
Which of the following is commonly used as a vector for introducing a DNA fragment in human lymphocytes?
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2018 (15 sets)
- A. λ phage
- B. pBR322
- C. Ti plasmid
- D. Retrovirus
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Q10
BIOLOGY
Unit 6: Reproduction
Which of the following is commonly used as a vector for introducing a DNA fragment in human lymphocytes?
- A. λ phage
- B. pBR322
- C. Ti plasmid
- D. Retrovirus
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Q11
BIOLOGY
Unit 9: Biotechnology and Its Applications
Use of bioresources by multinational companies and organisations without authorisation from the concerned country and its people is called
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2018 (14 sets)
- A. Biodegradation
- B. Bioexploitation
- C. Biopiracy
- D. Bio-infringement
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Q11
BIOLOGY
Unit 10: Ecology and Environment
Use of bioresources by multinational companies and organisations without authorisation from the concerned country and its people is called
↻ Repeated question — also appeared in
2018 (4 sets)
- A. Biodegradation
- B. Bioexploitation
- C. Biopiracy
- D. Bio-infringement
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Q12
BIOLOGY
Unit 9: Biotechnology and Its Applications
A ‘new’ variety of rice was patented by a foreign company, though such varieties have been present in India for a long time. This is related to
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Lerma Rojo
- B. Basmati
- C. Sharbati Sonora
- D. Co-667
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Q12
BIOLOGY
Unit 10: Ecology and Environment
A 'new' variety of rice was patented by a foreign company, though such varieties had been present in India for a long time. This is related to
- A. Lerma Rojo
- B. Basmati
- C. Sharbati Sonora
- D. Co-667
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Q13
BIOLOGY
Unit 9: Biotechnology and Its Applications
Select the correct match:
↻ Repeated question — also appeared in
2018 (2 sets)
- A. T.H. Morgan – Transduction
- B. G. Mendel – Transformation
- C. F2 × Recessive parent – Dihybrid cross
- D. Ribozyme – Nucleic acid
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Q14
BIOLOGY
Unit 3: Cell Structure and Function
Which of the following is true for nucleolus?
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2018 (15 sets)
- A. It takes part in spindle formation.
- B. It is a site for active ribosomal RNA synthesis.
- C. It is a membrane-bound structure.
- D. Larger nucleoli are present in dividing cells.
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Q15
BIOLOGY
Unit 3: Cell Structure and Function
The Golgi complex participates in
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Respiration in bacteria
- B. Activation of amino acid
- C. Formation of secretory vesicles
- D. Fatty acid breakdown
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Q16
BIOLOGY
Unit 4: Plant Physiology
Which of the following is not a product of light reaction of photosynthesis?
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2018 (15 sets)
- A. NADPH
- B. Oxygen
- C. NADH
- D. ATP
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Q17
BIOLOGY
Unit 1: Diversity in Living World
Which among the following is not a prokaryote?
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2018 (14 sets)
- A. Nostoc
- B. Oscillatoria
- C. Mycobacterium
- D. Saccharomyces
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Q18
BIOLOGY
Unit 4: Plant Physiology
Stomatal movement is not affected by
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2018 (15 sets)
- A. O2 concentration
- B. CO2 concentration
- C. Light
- D. Temperature
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Q19
BIOLOGY
Unit 1: Diversity in Living World
The two functional groups characteristic of sugars are
- A. carbonyl and phosphate
- B. carbonyl and hydroxyl
- C. carbonyl and methyl
- D. hydroxyl and methyl
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Q20
BIOLOGY
Unit 6: Reproduction
The stage during which separation of the paired homologous chromosomes begins is
↻ Repeated question — also appeared in
2018 (4 sets)
- A. Diakinesis
- B. Zygotene
- C. Diplotene
- D. Pachytene
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Q21
BIOLOGY
Unit 2: Structural Organisation in Animals and Plants
Stomata in grass leaf are
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2018 (10 sets)
- A. Rectangular
- B. Barrel shaped
- C. Kidney shaped
- D. Dumb-bell shaped
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Q22
BIOLOGY
Unit 1: Diversity in Living World
Which one is wrongly matched?
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2018 (15 sets)
- A. Gemma cups – Marchantia
- B. Unicellular organism – Chlorella
- C. Biflagellate zoospores – Brown algae
- D. Uniflagellate gametes – Polysiphonia
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Q23
BIOLOGY
Unit 1: Diversity in Living World
Match the items given in Column I with those in Column II and select the correct option given below:
Column I: a. Herbarium, b. Key, c. Museum, d. Catalogue
Column II: i. It is a place having a collection of preserved plants and animals. ii. A list that enumerates methodically all the species found in an area with brief description aiding identification. iii. Is a place where dried and pressed plant specimens mounted on sheets are kept. iv. A booklet containing a list of characters and their alternates which are helpful in identification of various taxa.
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2018 (10 sets)
- A. ii iv iii i
- B. iii iv i ii
- C. iii ii i iv
- D. i iv iii ii
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Q24
BIOLOGY
Unit 6: Reproduction
Winged pollen grains are present in
↻ Repeated question — also appeared in
2018 (11 sets)
- A. Mango
- B. Pinus
- C. Cycas
- D. Mustard
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Q25
BIOLOGY
Unit 6: Reproduction
After karyogamy followed by meiosis, spores are produced exogenously in
- A. Agaricus
- B. Saccharomyces
- C. Alternaria
- D. Neurospora
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Q26
BIOLOGY
Unit 4: Plant Physiology
Oxygen is not produced during photosynthesis by
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Cycas
- B. Chara
- C. Nostoc
- D. Green sulphur bacteria
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Q27
BIOLOGY
Unit 6: Reproduction
Double fertilization is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Fusion of two male gametes with one egg
- B. Syngamy and triple fusion
- C. Fusion of one male gamete with two polar nuclei
- D. Fusion of two male gametes of a pollen tube with two different eggs
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Q28
BIOLOGY
Unit 4: Plant Physiology
Which of the following elements is responsible for maintaining turgor in cells?
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2018 (16 sets)
- A. Potassium
- B. Calcium
- C. Sodium
- D. Magnesium
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Q28
BIOLOGY
Unit 4: Plant Physiology
Which of the following elements is responsible for maintaining turgor in cells?
↻ Repeated question — also appeared in
2018 (16 sets)
- A. Potassium
- B. Calcium
- C. Sodium
- D. Magnesium
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Q29
BIOLOGY
Unit 4: Plant Physiology
Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?
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2018 (1 set)
- A. Banana
- B. Viola
- C. Yucca
- D. Hydrilla
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Q29
BIOLOGY
Unit 10: Ecology and Environment
Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?
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2018 (4 sets)
- A. Banana
- B. Viola
- C. Yucca
- D. Hydrilla
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Q30
BIOLOGY
Unit 6: Reproduction
Pollen grains can be stored for several years in liquid nitrogen having a temperature of
↻ Repeated question — also appeared in
2018 (16 sets)
- A. –196°C
- B. –160°C
- C. –80°C
- D. –120°C
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Q30
BIOLOGY
Unit 6: Reproduction
Pollen grains can be stored for several years in liquid nitrogen having a temperature of
↻ Repeated question — also appeared in
2018 (16 sets)
- A. –196°C
- B. –160°C
- C. –80°C
- D. –120°C
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Q31
BIOLOGY
Unit 5: Human Physiology
What is the role of NAD+ in cellular respiration?
↻ Repeated question — also appeared in
2018 (4 sets)
- A. It is a nucleotide source for ATP synthesis.
- B. It is the final electron acceptor for anaerobic respiration.
- C. It functions as an electron carrier.
- D. It functions as an enzyme.
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Q31
BIOLOGY
Unit 5: Human Physiology
What is the role of NAD+ in cellular respiration?
↻ Repeated question — also appeared in
2018 (4 sets)
- A. It is a nucleotide source for ATP synthesis.
- B. It is the final electron acceptor for anaerobic respiration.
- C. It functions as an electron carrier.
- D. It functions as an enzyme.
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Q32
BIOLOGY
Unit 4: Plant Physiology
In which of the following forms is iron absorbed by plants?
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2018 (16 sets)
- A. Free element
- B. Both ferric and ferrous
- C. Ferrous
- D. Ferric
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Q32
BIOLOGY
Unit 4: Plant Physiology
In which of the following forms is iron absorbed by plants?
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2018 (16 sets)
- A. Free element
- B. Both ferric and ferrous
- C. Ferrous
- D. Ferric
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Q33
BIOLOGY
Unit 10: Ecology and Environment
Niche is
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2018 (15 sets)
- A. the range of temperature that the organism needs to live
- B. the functional role played by the organism where it lives
- C. the physical space where an organism lives
- D. all the biological factors in the organism’s environment
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Q34
BIOLOGY
Unit 10: Ecology and Environment
Which of the following is a secondary pollutant?
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2018 (15 sets)
- A. SO2
- B. O3
- C. CO2
- D. CO
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Q35
BIOLOGY
Unit 10: Ecology and Environment
Natality refers to
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2018 (15 sets)
- A. Number of individuals leaving the habitat
- B. Number of individuals entering a habitat
- C. Birth rate
- D. Death rate
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Q36
BIOLOGY
Unit 10: Ecology and Environment
World Ozone Day is celebrated on
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2018 (15 sets)
- A. 16th September
- B. 22nd April
- C. 21st April
- D. 5th June
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Q37
BIOLOGY
Unit 10: Ecology and Environment
What type of ecological pyramid would be obtained with the following data? Secondary consumer: 120 g; Primary consumer: 60 g; Primary producer: 10 g
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2018 (15 sets)
- A. Upright pyramid of numbers
- B. Upright pyramid of biomass
- C. Pyramid of energy
- D. Inverted pyramid of biomass
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Q38
BIOLOGY
Unit 10: Ecology and Environment
In stratosphere, which of the following elements acts as a catalyst in degradation of ozone and release of molecular oxygen?
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2018 (15 sets)
- A. Fe
- B. Oxygen
- C. Cl
- D. Carbon
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Q39
BIOLOGY
Unit 4: Plant Physiology
Casparian strips occur in
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2018 (1 set)
- A. Cortex
- B. Endodermis
- C. Pericycle
- D. Epidermis
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Q40
BIOLOGY
Unit 2: Structural Organisation in Animals and Plants
Plants having little or no secondary growth are
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2018 (14 sets)
- A. Conifers
- B. Cycads
- C. Deciduous angiosperms
- D. Grasses
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Q41
BIOLOGY
Unit 4: Plant Physiology
Pneumatophores occur in
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2018 (4 sets)
- A. Carnivorous plants
- B. Submerged hydrophytes
- C. Free-floating hydrophytes
- D. Halophytes
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Q42
BIOLOGY
Unit 4: Plant Physiology
Sweet potato is a modified
- A. Tap root
- B. Rhizome
- C. Adventitious root
- D. Stem
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Q43
BIOLOGY
Unit 1: Diversity in Living World
Which of the following statements is correct?
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2018 (15 sets)
- A. Horsetails are gymnosperms.
- B. Stems are usually unbranched in both Cycas and Cedrus.
- C. Selaginella is heterosporous, while Salvinia is homosporous.
- D. Ovules are not enclosed by ovary wall in gymnosperms.
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Q44
BIOLOGY
Unit 1: Diversity in Living World
Select the wrong statement:
↻ Repeated question — also appeared in
2018 (13 sets)
- A. Pseudopodia are locomotory and feeding structures in Sporozoans.
- B. Mitochondria are the powerhouse of the cell in all kingdoms except Monera.
- C. Mushrooms belong to Basidiomycetes.
- D. Cell wall is present in members of Fungi and Plantae.
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Q45
BIOLOGY
Unit 2: Structural Organisation in Animals and Plants
Secondary xylem and phloem in dicot stem are produced by
↻ Repeated question — also appeared in
2018 (14 sets)
- A. Phellogen
- B. Axillary meristems
- C. Vascular cambium
- D. Apical meristems
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Q46
BIOLOGY
Unit 5: Human Physiology
Match the items given in Column I with those in Column II and select the correct option given below:
Column I
a. Glycosuria
b. Gout
c. Renal calculi
d. Glomerular nephritis
Column II
i. Accumulation of uric acid in joints
ii. Mass of crystallised salts within the kidney
iii. Inflammation in glomeruli
iv. Presence of glucose in urine
↻ Repeated question — also appeared in
2018 (9 sets)
- A. ii iii i iv
- B. iv i ii iii
- C. i ii iii iv
- D. iii ii iv i
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Q47
BIOLOGY
Unit 5: Human Physiology
Match the items given in Column I with those in Column II and select the correct option given below:
Column I (Function)
a. Ultrafiltration
b. Concentration of urine
c. Transport of urine
d. Storage of urine
Column II (Part of Excretory System)
i. Henle’s loop
ii. Ureter
iii. Urinary bladder
iv. Malpighian corpuscle
v. Proximal convoluted tubule
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2018 (8 sets)
- A. v iv i ii
- B. v iv i iii
- C. iv i ii iii
- D. iv v ii iii
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Q48
BIOLOGY
Unit 1: Diversity in Living World
Among the following sets of examples for divergent evolution, select the incorrect option:
↻ Repeated question — also appeared in
2018 (1 set)
- A. Brain of bat, man and cheetah
- B. Eye of octopus, bat and man
- C. Heart of bat, man and cheetah
- D. Forelimbs of man, bat and cheetah
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Q49
BIOLOGY
Unit 9: Biotechnology and Its Applications
Which of the following is not an autoimmune disease?
- A. Alzheimer’s disease
- B. Vitiligo
- C. Rheumatoid arthritis
- D. Psoriasis
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Q50
BIOLOGY
Unit 1: Diversity in Living World
Which of the following characteristics represent inheritance of blood groups in humans?
a. Dominance
b. Co-dominance
c. Multiple allele
d. Incomplete dominance
e. Polygenic inheritance
- A. b, d and e
- B. a, c and e
- C. a, b and c
- D. b, c and e
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Q64
BIOLOGY
Unit 10: Ecology and Environment
In a growing population of a country,
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2018 (15 sets)
- A. reproductive and pre-reproductive individuals are equal in number.
- B. pre-reproductive individuals are less than the reproductive individuals.
- C. reproductive individuals are less than the post-reproductive individuals.
- D. pre-reproductive individuals are more than the reproductive individuals.
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Q65
BIOLOGY
Unit 8: Biology and Human Welfare
Which part of poppy plant is used to obtain the drug 'Smack'?
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2018 (13 sets)
- A. Roots
- B. Leaves
- C. Latex
- D. Flowers
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Q66
BIOLOGY
Unit 10: Ecology and Environment
Match the items given in Column I with those in Column II and select the correct option given below:
↻ Repeated question — also appeared in
2018 (1 set)
- A. a-iii, b-iv, c-i, d-ii
- B. a-i, b-ii, c-iv, d-iii
- C. a-i, b-iii, c-iv, d-ii
- D. a-ii, b-i, c-iii, d-iv
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Q67
BIOLOGY
Unit 8: Biology and Human Welfare
Which one of the following population interactions is widely used in medical science for the production of antibiotics?
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2018 (3 sets)
- A. Parasitism
- B. Amensalism
- C. Mutualism
- D. Commensalism
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Q68
BIOLOGY
Unit 10: Ecology and Environment
All of the following are included in ex-situ conservation except
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Botanical gardens
- B. Seed banks
- C. Sacred groves
- D. Wildlife safari parks
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Q69
BIOLOGY
Unit 5: Human Physiology
Which of the following gastric cells indirectly help in erythropoiesis?
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2018 (15 sets)
- A. Goblet cells
- B. Parietal cells
- C. Mucous cells
- D. Chief cells
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Q70
BIOLOGY
Unit 5: Human Physiology
Match the items given in Column I with those in Column II and select the correct option given below:
↻ Repeated question — also appeared in
2018 (4 sets)
- A. a-i, b-iii, c-ii
- B. a-ii, b-iii, c-i
- C. a-i, b-ii, c-iii
- D. a-iii, b-ii, c-i
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Q71
BIOLOGY
Unit 5: Human Physiology
Calcium is important in skeletal muscle contraction because it
↻ Repeated question — also appeared in
2018 (15 sets)
- A. detaches the myosin head from the actin filament.
- B. prevents the formation of bonds between the myosin cross bridges and the actin filament.
- C. activates the myosin ATPase by binding to it.
- D. binds to troponin to remove the masking of active sites on actin for myosin.
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Q72
BIOLOGY
Unit 5: Human Physiology
Which of the following is an occupational respiratory disorder?
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2018 (14 sets)
- A. Botulism
- B. Emphysema
- C. Silicosis
- D. Anthracis
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Q73
BIOLOGY
Unit 5: Human Physiology
Which of the following is an amino acid-derived hormone?
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2018 (15 sets)
- A. Estradiol
- B. Estriol
- C. Ecdysone
- D. Epinephrine
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Q74
BIOLOGY
Unit 5: Human Physiology
Which of the following structures or regions is incorrectly paired with its function?
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2018 (13 sets)
- A. Hypothalamus: production of releasing hormones and regulation of temperature, hunger and thirst.
- B. Corpus callosum: band of fibers connecting left and right cerebral hemispheres.
- C. Limbic system: consists of fibre tracts that interconnect different regions of brain; controls movement.
- D. Medulla oblongata: controls respiration and cardiovascular reflexes.
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Q75
BIOLOGY
Unit 5: Human Physiology
Which of the following hormones can play a significant role in osteoporosis?
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2018 (15 sets)
- A. Estrogen and Parathyroid hormone
- B. Parathyroid hormone and Prolactin
- C. Progesterone and Aldosterone
- D. Aldosterone and Prolactin
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Q91
PHYSICS
Unit 10: Oscillations and Waves
A tuning fork is used to produce resonance in a glass tube. The length of the air column in this tube can be adjusted by a variable piston. At room temperature of 27 °C two successive resonances are produced at 20 cm and 73 cm of column length. If the frequency of the tuning fork is 320 Hz, the velocity of sound in air at 27 °C is
↻ Repeated question — also appeared in
2018 (14 sets)
- A. 350 m/s
- B. 300 m/s
- C. 339 m/s
- D. 330 m/s
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Q92
PHYSICS
Unit 11: Electrostatics
The electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A, is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. proportional to the square root of the distance between the plates.
- B. inversely proportional to the distance between the plates.
- C. linearly proportional to the distance between the plates.
- D. independent of the distance between the plates.
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Q93
PHYSICS
Unit 11: Electrostatics
An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance h. The time of fall of the electron, in comparison to the time of fall of the proton is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. 10 times greater
- B. equal
- C. 5 times greater
- D. smaller
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Q93
PHYSICS
Unit 11: Electrostatics
An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance h. The time of fall of the electron, in comparison to the time of fall of the proton is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. 10 times greater
- B. equal
- C. 5 times greater
- D. smaller
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Q94
PHYSICS
Unit 10: Oscillations and Waves
A pendulum is hung from the roof of a sufficiently high building and is moving freely to and fro like a simple harmonic oscillator. The acceleration of the bob of the pendulum is 20 m/s² at a distance of 5 m from the mean position. The time period of oscillation is
↻ Repeated question — also appeared in
2018 (16 sets)
- A. 2 s
- B. 1 s
- C. π s
- D. 2π s
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Q94
PHYSICS
Unit 10: Oscillations and Waves
A pendulum is hung from the roof of a sufficiently high building and is moving freely to and fro like a simple harmonic oscillator. The acceleration of the bob of the pendulum is 20 m/s^2 at a distance of 5 m from the mean position. The time period of oscillation is
↻ Repeated question — also appeared in
2018 (16 sets)
- A. 2 s
- B. 1 s
- C. π s
- D. 2π s
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Q95
PHYSICS
Unit 12: Current Electricity
Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is 20 div/V. The resistance of the galvanometer is
↻ Repeated question — also appeared in
2018 (11 sets)
- A. 250 Ω
- B. 500 Ω
- C. 25 Ω
- D. 40 Ω
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Q95
PHYSICS
Unit 12: Current Electricity
Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is 20 div/V. The resistance of the galvanometer is
↻ Repeated question — also appeared in
2018 (11 sets)
- A. 250 Ω
- B. 500 Ω
- C. 25 Ω
- D. 40 Ω
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Q96
PHYSICS
Unit 13: Magnetic Effects of Current and Magnetism
A metallic rod of mass per unit length 0.5 kg m−1 is lying horizontally on a smooth inclined plane which makes an angle of 30° with the horizontal. The rod is not allowed to slide down by flowing a current through it when a magnetic field of induction 0.25 T is acting on it in the vertical direction. The current flowing in the rod to keep it stationary is
↻ Repeated question — also appeared in
2018 (14 sets)
- A. 14.76 A
- B. 11.32 A
- C. 5.98 A
- D. 7.14 A
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Q97
PHYSICS
Unit 13: Magnetic Effects of Current and Magnetism
A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational potential energy. The work required to do this comes from
↻ Repeated question — also appeared in
2018 (14 sets)
- A. the lattice structure of the material of the rod
- B. the induced electric field due to the changing magnetic field
- C. the magnetic field
- D. the current source
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Q98
PHYSICS
Unit 14: Electromagnetic Induction and Alternating Currents
An inductor 20 mH, a capacitor 100 μF and a resistor 50 Ω are connected in series across a source of emf, V = 10 sin 314 t. The power loss in the circuit is
↻ Repeated question — also appeared in
2018 (14 sets)
- A. 2.74 W
- B. 1.13 W
- C. 0.43 W
- D. 0.79 W
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Q99
PHYSICS
Unit 16: Optics
An object is placed at a distance of 40 cm from a concave mirror of focal length 15 cm. If the object is displaced through a distance of 20 cm towards the mirror, the displacement of the image will be
↻ Repeated question — also appeared in
2018 (14 sets)
- A. 30 cm towards the mirror
- B. 36 cm towards the mirror
- C. 36 cm away from the mirror
- D. 30 cm away from the mirror
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Q100
PHYSICS
Unit 15: Electromagnetic Waves
An em wave is propagating in a medium with a velocity V = V î. The instantaneous oscillating electric field of this em wave is along +y axis. Then the direction of oscillating magnetic field of the em wave will be along
↻ Repeated question — also appeared in
2018 (15 sets)
- A. − y direction
- B. − x direction
- C. + z direction
- D. − z direction
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Q101
PHYSICS
Unit 14: Electromagnetic Induction and Alternating Currents
The magnetic potential energy stored in a certain inductor is 25 mJ, when the current in the inductor is 60 mA. This inductor is of inductance
↻ Repeated question — also appeared in
2018 (11 sets)
- A. 1.389 H
- B. 13.89 H
- C. 138.88 H
- D. 0.138 H
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Q102
PHYSICS
Unit 16: Optics
The refractive index of the material of a prism is 2 and the angle of the prism is 30°. One of the two refracting surfaces of the prism is made a mirror inwards, by silver coating. A beam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface) if its angle of incidence on the prism is
↻ Repeated question — also appeared in
2018 (14 sets)
- A. 30°
- B. zero
- C. 45°
- D. 60°
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Q103
PHYSICS
Unit 18: Atoms and Nuclei
The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. 2 : −1
- B. 1 : −2
- C. 1 : −1
- D. 1 : 1
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Q104
PHYSICS
Unit 17: Dual Nature of Matter and Radiation
An electron of mass m with an initial velocity V = V0 î (V0 > 0) enters an electric field E = −E0 î (E0 = constant > 0) at t = 0. If λ0 is its de-Broglie wavelength initially, then its de-Broglie wavelength at time t is
↻ Repeated question — also appeared in
2018 (11 sets)
- A. λ0 t
- B. λ0
- C. λ0 (1 + eE0 t / mV0)
- D. λ0 / (1 + eE0 t / mV0)
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Q105
PHYSICS
Unit 18: Atoms and Nuclei
For a radioactive material, half-life is 10 minutes. If initially there are 600 number of nuclei, the time taken (in minutes) for the disintegration of 450 nuclei is
↻ Repeated question — also appeared in
2018 (16 sets)
- A. 30
- B. 15
- C. 10
- D. 20
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Q105
PHYSICS
Unit 18: Atoms and Nuclei
For a radioactive material, half-life is 10 minutes. If initially there are 600 nuclei, the time taken (in minutes) for the disintegration of 450 nuclei is
↻ Repeated question — also appeared in
2018 (16 sets)
- A. 30
- B. 15
- C. 10
- D. 20
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Q106
PHYSICS
Unit 17: Dual Nature of Matter and Radiation
When the light of frequency 2ν0 (where ν0 is threshold frequency), is incident on a metal plate, the maximum velocity of electrons emitted is v1. When the frequency of the incident radiation is increased to 5ν0, the maximum velocity of electrons emitted from the same plate is v2. The ratio of v1 to v2 is
↻ Repeated question — also appeared in
2018 (16 sets)
- A. 4 : 1
- B. 2 : 1
- C. 1 : 4
- D. 1 : 2
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Q106
PHYSICS
Unit 17: Dual Nature of Matter and Radiation
When light of frequency 2v0, where v0 is the threshold frequency, is incident on a metal plate, the maximum velocity of electrons emitted is v1. When the frequency of the incident radiation is increased to 5v0, the maximum velocity of electrons emitted from the same plate is v2. The ratio of v1 to v2 is
↻ Repeated question — also appeared in
2018 (16 sets)
- A. 4 : 1
- B. 2 : 1
- C. 1 : 4
- D. 1 : 2
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Q107
PHYSICS
Unit 19: Electronic Devices
In the circuit shown in the figure, the input voltage Vi is 20 V, VBE = 0 and VCE = 0. The values of IB, IC and β are given by
↻ Repeated question — also appeared in
2018 (8 sets)
- A. IB = 20 μA, IC = 5 mA, β = 250
- B. IB = 40 μA, IC = 5 mA, β = 125
- C. IB = 25 μA, IC = 5 mA, β = 200
- D. IB = 40 μA, IC = 10 mA, β = 250
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Q108
PHYSICS
Unit 19: Electronic Devices
In a p-n junction diode, change in temperature due to heating
↻ Repeated question — also appeared in
2018 (15 sets)
- A. does not affect resistance of p-n junction
- B. affects the overall V-I characteristics of p-n junction
- C. affects only forward resistance
- D. affects only reverse resistance
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Q109
PHYSICS
Unit 19: Electronic Devices
In the combination of the following gates the output Y can be written in terms of inputs A and B as
↻ Repeated question — also appeared in
2018 (8 sets)
- A. BA̅ + A̅B
- B. BA +
- C. A·B̅ + A̅·B
- D. BA
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Q110
CHEMISTRY
Unit 5: Solutions
A carbon resistor of (47 ± 4.7) kΩ is to be marked with rings of different colours for its identification. The colour code sequence will be
- A. Yellow – Green – Violet – Gold
- B. Green – Orange – Violet – Gold
- C. Yellow – Violet – Orange – Silver
- D. Violet – Yellow – Orange – Silver
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Q111
PHYSICS
Unit 12: Current Electricity
A set of n equal resistors, of value R each, are connected in series to a battery of emf E and internal resistance R. The current drawn is I. Now, the n resistors are connected in parallel to the same battery. Then the current drawn from battery becomes 10 I. The value of n is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. 20
- B. 9
- C. 11
- D. 10
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Q113
PHYSICS
Unit 8: Thermodynamics
The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. 6.25%
- B. 12.5%
- C. 20%
- D. 26.8%
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Q114
PHYSICS
Unit 8: Thermodynamics
The volume (V) of a monatomic gas varies with its temperature (T), as shown in the graph. The ratio of work done by the gas, to the heat absorbed by it, when it undergoes a change from state A to state B, is
↻ Repeated question — also appeared in
2018 (5 sets)
- A. 1/3
- B. 2/7
- C. 2/3
- D. 2/5
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Q115
PHYSICS
Unit 10: Oscillations and Waves
The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of the closed organ pipe is 20 cm, the length of the open organ pipe is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. 12.5 cm
- B. 16 cm
- C. 8 cm
- D. 13.2 cm
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Q116
PHYSICS
Unit 9: Kinetic Theory of Gases
At what temperature will the rms speed of oxygen molecules become just sufficient for escaping from the Earth’s atmosphere? Given: mass of oxygen molecule m = 2.76 × 10^-26 kg; Boltzmann’s constant kB = 1.38 × 10^-23 J K^-1
↻ Repeated question — also appeared in
2018 (13 sets)
- A. 5.016 × 10^4 K
- B. 1.254 × 10^4 K
- C. 8.360 × 10^4 K
- D. 2.508 × 10^4 K
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Q117
PHYSICS
Unit 4: Work Energy and Power
The power radiated by a black body is P and it radiates maximum energy at wavelength λ0. If the temperature of the black body is now changed so that it radiates maximum energy at wavelength 4/3 λ0, the power radiated by it becomes nP. The value of n is
- A. 81/256
- B. 256/81
- C. 3/4
- D. 4/3
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Q118
PHYSICS
Unit 7: Properties of Solids and Liquids
Two wires are made of the same material and have the same volume. The first wire has cross-sectional area A and the second wire has cross-sectional area 3A. If the length of the first wire is increased by Δl on applying a force F, how much force is needed to stretch the second wire by the same amount?
↻ Repeated question — also appeared in
2018 (14 sets)
- A. 4 F
- B. F
- C. 6 F
- D. 9 F
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Q118
PHYSICS
Unit 3: Laws of Motion
Two wires are made of the same material and have the same volume. The first wire has cross-sectional area A and the second wire has cross-sectional area 3A. If the length of the first wire is increased by Δl on applying a force F, how much force is needed to stretch the second wire by the same amount?
- A. 4F
- B. F
- C. 6F
- D. 9F
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Q119
PHYSICS
Unit 7: Properties of Solids and Liquids
A small sphere of radius r falls from rest in a viscous liquid. As a result, heat is produced due to viscous force. The rate of production of heat when the sphere attains its terminal velocity, is proportional to
↻ Repeated question — also appeared in
2018 (16 sets)
- A. r^5
- B. r^4
- C. r^2
- D. r^3
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Q119
PHYSICS
Unit 7: Properties of Solids and Liquids
A small sphere of radius r falls from rest in a viscous liquid. As a result, heat is produced due to viscous force. The rate of production of heat when the sphere attains its terminal velocity is proportional to
↻ Repeated question — also appeared in
2018 (16 sets)
- A. r^5
- B. r^4
- C. r^2
- D. r^3
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Q120
PHYSICS
Unit 8: Thermodynamics
A sample of 0.1 g of water at 100°C and normal pressure (1.013 × 10^5 N m^-2) requires 54 cal of heat energy to convert to steam at 100°C. If the volume of the steam produced is 167.1 cc, the change in internal energy of the sample is
↻ Repeated question — also appeared in
2018 (16 sets)
- A. 42.2 J
- B. 84.5 J
- C. 208.7 J
- D. 104.3 J
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Q120
PHYSICS
Unit 8: Thermodynamics
A sample of 0.1 g of water at 100°C and normal pressure (1.013 × 10^5 N m^-2) requires 54 cal of heat energy to convert to steam at 100°C. If the volume of the steam produced is 167.1 cc, the change in internal energy of the sample is
↻ Repeated question — also appeared in
2018 (16 sets)
- A. 42.2 J
- B. 84.5 J
- C. 208.7 J
- D. 104.3 J
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Q121
PHYSICS
Unit 6: Gravitation
The kinetic energies of a planet in an elliptical orbit about the Sun, at positions A, B and C are K_A, K_B and K_C respectively. AC is the major axis and SB is perpendicular to AC at the position of the Sun S as shown in the figure. Then
↻ Repeated question — also appeared in
2018 (10 sets)
- A. K_B < K_A < K_C
- B. K_B > K_A > K_C
- C. K_A > K_B > K_C
- D. K_A < K_B < K_C
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Q122
PHYSICS
Unit 5: Rotational Motion
A solid sphere is in rolling motion. In rolling motion a body possesses translational kinetic energy (K_t) as well as rotational kinetic energy (K_r) simultaneously. The ratio K_t : (K_t + K_r) for the sphere is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. 10 : 7
- B. 2 : 5
- C. 5 : 7
- D. 7 : 10
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Q123
PHYSICS
Unit 5: Rotational Motion
A solid sphere is rotating freely about its symmetry axis in free space. The radius of the sphere is increased keeping its mass same. Which of the following physical quantities would remain constant for the sphere?
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Rotational kinetic energy
- B. Angular momentum
- C. Moment of inertia
- D. Angular velocity
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Q124
PHYSICS
Unit 6: Gravitation
If the mass of the Sun were ten times smaller and the universal gravitational constant were ten times larger in magnitude, which of the following is not correct?
↻ Repeated question — also appeared in
2018 (13 sets)
- A. Time period of a simple pendulum on the Earth would decrease.
- B. g on the Earth will not change.
- C. Walking on the ground would become more difficult.
- D. Raindrops will fall faster.
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Q125
PHYSICS
Unit 4: Work Energy and Power
A body initially at rest and sliding along a frictionless track from a height h (as shown in the figure) just completes a vertical circle of diameter AB = D. The height h is equal to
↻ Repeated question — also appeared in
2018 (11 sets)
- A. 5/7 D
- B. 4/5 D
- C. D
- D. 2/3 D
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Q126
PHYSICS
Unit 5: Rotational Motion
Three objects, A: a solid sphere, B: a thin circular disk and C: a circular ring, each have the same mass M and radius R. They all spin with the same angular speed ω about their own symmetry axes. The amounts of work W required to bring them to rest would satisfy the relation
↻ Repeated question — also appeared in
2018 (15 sets)
- A. W_B > W_A > W_C
- B. W_A > W_C > W_B
- C. W_A > W_B > W_C
- D. W_C > W_B > W_A
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Q127
PHYSICS
Unit 3: Laws of Motion
A moving block having mass m collides with another stationary block having mass 4m. The lighter block comes to rest after collision. When the initial velocity of the lighter block is v, then the value of coefficient of restitution (e) will be
↻ Repeated question — also appeared in
2018 (10 sets)
- A. 0.8
- B. 0.4
- C. 0.25
- D. 0.5
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Q128
PHYSICS
Unit 3: Laws of Motion
Which one of the following statements is incorrect?
↻ Repeated question — also appeared in
2018 (14 sets)
- A. Frictional force opposes the relative motion.
- B. Coefficient of sliding friction has dimensions of length.
- C. Limiting value of static friction is directly proportional to normal reaction.
- D. Rolling friction is smaller than sliding friction.
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Q129
PHYSICS
Unit 5: Rotational Motion
The moment of the force F = 4i + 5j − 6k at (2, 0, −3), about the point (2, −2, −2), is given by
↻ Repeated question — also appeared in
2018 (13 sets)
- A. −7i − 8j − 4k
- B. −7i − 4j − 8k
- C. −4i − j − 8k
- D. −8i − 4j − 7k
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Q130
PHYSICS
Unit 2: Kinematics
A toy car with charge q moves on a frictionless horizontal plane surface under the influence of a uniform electric field E. Due to the force qE, its velocity increases from 0 to 6 m/s in one second duration. At that instant the direction of the field is reversed. The car continues to move for two more seconds under the influence of this field. The average velocity and the average speed of the toy car between 0 to 3 seconds are respectively
↻ Repeated question — also appeared in
2018 (14 sets)
- A. 1 m/s, 3.5 m/s
- B. 1.5 m/s, 3 m/s
- C. 1 m/s, 3 m/s
- D. 2 m/s, 4 m/s
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Q130
PHYSICS
Unit 2: Kinematics
A toy car with charge q moves on a frictionless horizontal plane surface under the influence of a uniform electric field E. Due to the force qE, its velocity increases from 0 to 6 m/s in one second duration. At that instant the direction of the field is reversed. The car continues to move for two more seconds under the influence of this field. The average velocity and the average speed of the toy car between 0 to 3 seconds are respectively
↻ Repeated question — also appeared in
2018 (14 sets)
- A. 1 m/s, 3.5 m/s
- B. 1.5 m/s, 3 m/s
- C. 1 m/s, 3 m/s
- D. 2 m/s, 4 m/s
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Q131
PHYSICS
Unit 3: Laws of Motion
A block of mass m is placed on a smooth inclined wedge ABC of inclination θ as shown in the figure. The wedge is given an acceleration a towards the right. The relation between a and θ for the block to remain stationary on the wedge is
↻ Repeated question — also appeared in
2018 (12 sets)
- A. a = g cos θ
- B. a = g tan θ
- C. a = g/sin θ
- D. a = g/cos θ
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Q131
PHYSICS
Unit 3: Laws of Motion
A block of mass m is placed on a smooth inclined wedge ABC of inclination θ as shown in the figure. The wedge is given an acceleration a towards the right. The relation between a and θ for the block to remain stationary on the wedge is
↻ Repeated question — also appeared in
2018 (12 sets)
- A. a = g cos θ
- B. a = g tan θ
- C. a = g sin θ
- D. a = g sec θ
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Q132
PHYSICS
Unit 20: Experimental Skills
A student measured the diameter of a small steel ball using a screw gauge of least count 0.001 cm. The main scale reading is 5 mm and zero of circular scale division coincides with 25 divisions above the reference level. If screw gauge has a zero error of -0.004 cm, the correct diameter of the ball is
↻ Repeated question — also appeared in
2018 (8 sets)
- A. 0.053 cm
- B. 0.529 cm
- C. 0.525 cm
- D. 0.521 cm
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Q133
PHYSICS
Unit 16: Optics
Unpolarised light is incident from air on a plane surface of a material of refractive index μ. At a particular angle of incidence i, it is found that the reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation?
↻ Repeated question — also appeared in
2018 (15 sets)
- A. i = sin^-1(1/μ)
- B. i = tan^-1(1/μ)
- C. Reflected light is polarised with its electric vector perpendicular to the plane of incidence
- D. Reflected light is polarised with its electric vector parallel to the plane of incidence
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Q134
PHYSICS
Unit 16: Optics
In Young's double slit experiment the separation d between the slits is 2 mm, the wavelength λ of the light used is 5896 Å and distance D between the screen and slits is 100 cm. It is found that the angular width of the fringes is 0.20°. To increase the fringe angular width to 0.21° (with same λ and D) the separation between the slits needs to be changed to
↻ Repeated question — also appeared in
2018 (14 sets)
- A. 2.1 mm
- B. 1.7 mm
- C. 1.9 mm
- D. 1.8 mm
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Q135
PHYSICS
Unit 16: Optics
An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of
↻ Repeated question — also appeared in
2018 (15 sets)
- A. large focal length and large diameter
- B. small focal length and small diameter
- C. large focal length and small diameter
- D. small focal length and large diameter
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Q136
CHEMISTRY
Unit 1: Some Basic Concepts in Chemistry
In which case is the number of molecules of water maximum?
↻ Repeated question — also appeared in
2018 (15 sets)
- A. 0.00224 L of water vapours at 1 atm and 273 K
- B. 10^-3 mol of water
- C. 0.18 g of water
- D. 18 mL of water
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Q137
CHEMISTRY
Unit 10: p-Block Elements
Consider the change in oxidation state of bromine corresponding to different emf values as shown in the diagram below. Then the species undergoing disproportionation is
- A. Br2
- B. HBrO
- C. BrO4^-
- D. BrO3^-
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Q138
CHEMISTRY
Unit 7: Redox Reactions and Electrochemistry
Among CaH2, BeH2, BaH2, the order of ionic character is
- A. BeH2 < BaH2 < CaH2
- B. BaH2 < BeH2 < CaH2
- C. CaH2 < BeH2 < BaH2
- D. BeH2 < CaH2 < BaH2
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Q139
CHEMISTRY
Unit 8: Chemical Kinetics
The correct difference between first- and second-order reactions is that
↻ Repeated question — also appeared in
2018 (15 sets)
- A. a first-order reaction can be catalyzed; a second-order reaction cannot be catalyzed
- B. the rate of a first-order reaction does depend on reactant concentrations; the rate of a second-order reaction does not depend on reactant concentrations
- C. the half-life of a first-order reaction does not depend on [A]0; the half-life of a second-order reaction does depend on [A]0
- D. the rate of a first-order reaction does not depend on reactant concentrations; the rate of a second-order reaction does depend on reactant concentrations
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Q140
CHEMISTRY
Unit 12: Coordination Compounds
The type of isomerism shown by the complex [CoCl2(en)2] is
↻ Repeated question — also appeared in
2018 (16 sets)
- A. Ionization isomerism
- B. Linkage isomerism
- C. Coordination isomerism
- D. Geometrical isomerism
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Q140
CHEMISTRY
Unit 12: Coordination Compounds
The type of isomerism shown by the complex [CoCl2(en)2] is
↻ Repeated question — also appeared in
2018 (16 sets)
- A. Ionization isomerism
- B. Linkage isomerism
- C. Coordination isomerism
- D. Geometrical isomerism
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Q141
CHEMISTRY
Unit 12: Coordination Compounds
Which one of the following ions exhibits d-d transition and paramagnetism as well?
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2018 (6 sets)
- A. MnO4^-
- B. MnO4^2-
- C. Cr2O7^2-
- D. CrO4^2-
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Q141
CHEMISTRY
Unit 12: Coordination Compounds
Which one of the following ions exhibits d-d transition and paramagnetism as well?
↻ Repeated question — also appeared in
2018 (6 sets)
- A. MnO4−
- B. MnO4^2−
- C. CrO4^2−
- D. Cr2O7^2−
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Q142
CHEMISTRY
Unit 12: Coordination Compounds
The geometry and magnetic behaviour of the complex [Ni(CO)4] are
↻ Repeated question — also appeared in
2018 (16 sets)
- A. square planar geometry and paramagnetic
- B. tetrahedral geometry and paramagnetic
- C. tetrahedral geometry and diamagnetic
- D. square planar geometry and diamagnetic
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Q142
CHEMISTRY
Unit 12: Coordination Compounds
The geometry and magnetic behaviour of the complex [Ni(CO)4] are
↻ Repeated question — also appeared in
2018 (16 sets)
- A. square planar geometry and paramagnetic
- B. tetrahedral geometry and paramagnetic
- C. tetrahedral geometry and diamagnetic
- D. square planar geometry and diamagnetic
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Q143
CHEMISTRY
Unit 12: Coordination Compounds
Iron carbonyl, Fe(CO)5 is
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2018 (15 sets)
- A. trinuclear
- B. dinuclear
- C. mononuclear
- D. tetranuclear
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Q143
CHEMISTRY
Unit 12: Coordination Compounds
Iron carbonyl, Fe(CO)5 is
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2018 (15 sets)
- A. trinuclear
- B. dinuclear
- C. mononuclear
- D. tetranuclear
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Q144
CHEMISTRY
Unit 12: Coordination Compounds
Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code:
Column I: a. Co3+, b. Cr3+, c. Fe3+, d. Ni2+
Column II: i. 8 B.M., ii. 3.5 B.M., iii. 3 B.M., iv. 2.4 B.M., v. 1.5 B.M.
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2018 (8 sets)
- A. iv i ii iii
- B. iii v i ii
- C. i ii iii iv
- D. iv v ii i
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Q144
CHEMISTRY
Unit 12: Coordination Compounds
Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code:
Column I: a. Co3+; b. Cr3+; c. Fe3+; d. Ni2+
Column II: i. 8 B.M.; ii. 3.5 B.M.; iii. 3 B.M.; iv. 2.4 B.M.; v. 1.5 B.M.
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2018 (8 sets)
- A. iv i ii iii
- B. iii v i ii
- C. i ii iii iv
- D. iv v ii i
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Q145
CHEMISTRY
Unit 10: p-Block Elements
Which one of the following elements is unable to form MF6^3− ion?
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2018 (14 sets)
- A. B
- B. In
- C. Al
- D. Ga
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Q146
CHEMISTRY
Unit 3: Chemical Bonding and Molecular Structure
In the structure of ClF3, the number of lone pairs of electrons on central atom Cl is
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2018 (13 sets)
- A. four
- B. three
- C. two
- D. one
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Q147
CHEMISTRY
Unit 10: p-Block Elements
The correct order of N-compounds in decreasing order of oxidation states is
↻ Repeated question — also appeared in
2018 (10 sets)
- A. HNO3, NH4Cl, NO, N2
- B. NH4Cl, N2, NO, HNO3
- C. HNO3, NO, NH4Cl, N2
- D. HNO3, NO, N2, NH4Cl
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Q148
CHEMISTRY
Unit 10: p-Block Elements
Which of the following statements is not true for halogens?
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- A. All but fluorine show positive oxidation states.
- B. Chlorine has the highest electron-gain enthalpy.
- C. All are oxidizing agents.
- D. All form monobasic oxyacids.
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Q149
CHEMISTRY
Unit 10: p-Block Elements
Considering Ellingham diagram, which of the following metals can be used to reduce alumina?
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- A. Mg
- B. Cu
- C. Zn
- D. Fe
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Q150
CHEMISTRY
Unit 9: Classification of Elements and Periodicity in Properties
The correct order of atomic radii in group 13 elements is
↻ Repeated question — also appeared in
2018 (12 sets)
- A. B < Ga < Al < Tl < In
- B. B < Ga < Al < In < Tl
- C. B < Al < Ga < In < Tl
- D. B < Al < In < Ga < Tl
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Q152
CHEMISTRY
Unit 17: Organic Compounds Containing Oxygen
Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their
↻ Repeated question — also appeared in
2018 (13 sets)
- A. more extensive association of carboxylic acid via van der Waals force of attraction
- B. formation of intermolecular H-bonding
- C. formation of carboxylate ion
- D. formation of intramolecular H-bonding
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Q154
CHEMISTRY
Unit 14: Some Basic Principles of Organic Chemistry
Which of the following molecules represents the order of hybridisation sp2, sp2, sp, sp from left to right atoms?
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2018 (11 sets)
- A. CH2=CH–CH=CH2
- B. CH3–CH=CH–CH3
- C. CH2=CH–C≡CH
- D. HC≡C–C≡CH
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Q156
CHEMISTRY
Unit 14: Some Basic Principles of Organic Chemistry
Which of the following is correct with respect to −I effect of the substituents? (R = alkyl)
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2018 (13 sets)
- A. −NH2 > −OR > −F
- B. −NR2 > −OR > −F
- C. −NR2 < −OR < −F
- D. −NH2 < −OR < −F
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Q157
CHEMISTRY
Unit 14: Some Basic Principles of Organic Chemistry
Regarding cross-linked or network polymers, which of the following statements is incorrect?
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2018 (7 sets)
- A. Examples are bakelite and melamine.
- B. They contain strong covalent bonds in their polymer chains.
- C. They are formed from bi- and tri-functional monomers.
- D. They contain covalent bonds between various linear polymer chains.
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Q158
CHEMISTRY
Unit 14: Some Basic Principles of Organic Chemistry
Nitration of aniline in strong acidic medium also gives m-nitroaniline because
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2018 (1 set)
- A. In absence of substituents nitro group always goes to m-position.
- B. In acidic (strong) medium aniline is present as anilinium ion.
- C. In electrophilic substitution reactions amino group is meta directive.
- D. In spite of substituents nitro group always goes to only m-position.
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Q158
CHEMISTRY
Unit 16: Organic Compounds Containing Halogens
Nitration of aniline in strong acidic medium also gives m-nitroaniline because
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2018 (1 set)
- A. In absence of substituents nitro group always goes to m-position.
- B. In acidic (strong) medium aniline is present as anilinium ion.
- C. In electrophilic substitution reactions amino group is meta directive.
- D. In spite of substituents nitro group always goes to only m-position.
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Q159
CHEMISTRY
Unit 19: Biomolecules
The difference between amylose and amylopectin is
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2018 (15 sets)
- A. Amylopectin have 1→4 α-linkage and 1→6 β-linkage
- B. Amylose is made up of glucose and galactose
- C. Amylose have 1→4 α-linkage and 1→6 β-linkage
- D. Amylopectin have 1→4 α-linkage and 1→6 α-linkage
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Q159
CHEMISTRY
Unit 19: Biomolecules
The difference between amylose and amylopectin is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Amylopectin have 1 → 4 α-linkage and 1 → 6 β-linkage
- B. Amylose is made up of glucose and galactose
- C. Amylose have 1 → 4 α-linkage and 1 → 6 β-linkage
- D. Amylopectin have 1 → 4 α-linkage and 1 → 6 α-linkage
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Q160
CHEMISTRY
Unit 14: Some Basic Principles of Organic Chemistry
A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. H2SO4. The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP will be
↻ Repeated question — also appeared in
2018 (3 sets)
- A. 2.8
- B. 4.4
- C. 3.0
- D. 1.4
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Q160
CHEMISTRY
Unit 14: Some Basic Principles of Organic Chemistry
A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. H2SO4. The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP will be
↻ Repeated question — also appeared in
2018 (3 sets)
- A. 2.8
- B. 4.4
- C. 3.0
- D. 1.4
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Q161
CHEMISTRY
Unit 9: Classification of Elements and Periodicity in Properties
Which of the following oxides is most acidic in nature?
↻ Repeated question — also appeared in
2018 (9 sets)
- A. BaO
- B. CaO
- C. BeO
- D. MgO
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Q161
CHEMISTRY
Unit 9: Classification of Elements and Periodicity in Properties
Which of the following oxides is most acidic in nature?
↻ Repeated question — also appeared in
2018 (9 sets)
- A. BaO
- B. CaO
- C. BeO
- D. MgO
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Q162
CHEMISTRY
Unit 7: Redox Reactions and Electrochemistry
For the redox reaction MnO4− + C2O4^2− + H+ → Mn2+ + CO2 + H2O, the correct coefficients of the reactants for the balanced equation are
↻ Repeated question — also appeared in
2018 (9 sets)
- A. 2, 5, 16
- B. 2, 5, 6
- C. 1, 5, 16
- D. 2, 3, 8
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Q162
CHEMISTRY
Unit 7: Redox Reactions and Electrochemistry
For the redox reaction MnO4− + C2O4^2− + H+ → Mn2+ + CO2 + H2O, the correct coefficients of the reactants for the balanced equation are
↻ Repeated question — also appeared in
2018 (9 sets)
- A. 2 16 5
- B. 5 16 2
- C. 2 5 16
- D. 16 5 2
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Q163
CHEMISTRY
Unit 4: Chemical Thermodynamics
Which one of the following conditions will favour maximum formation of the product in the reaction, A2(g) + B2(g) ⇌ X2(g), ΔrH = −X kJ ?
- A. High temperature and high pressure
- B. High temperature and low pressure
- C. Low temperature and low pressure
- D. Low temperature and high pressure
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Q164
CHEMISTRY
Unit 8: Chemical Kinetics
When initial concentration of the reactant is doubled, the half-life period of a zero order reaction
↻ Repeated question — also appeared in
2018 (15 sets)
- A. is tripled
- B. remains unchanged
- C. is doubled
- D. is halved
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Q165
CHEMISTRY
Unit 4: Chemical Thermodynamics
The bond dissociation energies of X2, Y2 and XY are in the ratio 1 : 0.5 : 1. ΔH for the formation of XY is −200 kJ mol−1. The bond dissociation energy of X2 will be
↻ Repeated question — also appeared in
2018 (12 sets)
- A. 800 kJ mol−1
- B. 400 kJ mol−1
- C. 100 kJ mol−1
- D. 200 kJ mol−1
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Q166
CHEMISTRY
Unit 4: Chemical Thermodynamics
The correction factor 'a' to the ideal gas equation corresponds to
↻ Repeated question — also appeared in
2018 (3 sets)
- A. electric field present between the gas molecules
- B. forces of attraction between the gas molecules
- C. volume of the gas molecules
- D. density of the gas molecules
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Q167
CHEMISTRY
Unit 5: Solutions
Following solutions were prepared by mixing different volumes of NaOH and HCl of different concentrations: a. 60 mL 10 M HCl + 40 mL 10 M NaOH; b. 55 mL 10 M HCl + 45 mL 10 M NaOH; c. 75 mL 5 M HCl + 25 mL 5 M NaOH; d. 100 mL 10 M HCl + 100 mL 10 M NaOH. pH of which one of them will be equal to 1?
↻ Repeated question — also appeared in
2018 (1 set)
- A. d
- B. c
- C. a
- D. b
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Q168
CHEMISTRY
Unit 12: Coordination Compounds
On which of the following properties does the coagulating power of an ion depend?
- A. Both magnitude and sign of the charge on the ion
- B. The sign of charge on the ion alone
- C. Size of the ion alone
- D. The magnitude of the charge on the ion alone
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Q169
CHEMISTRY
Unit 4: Chemical Thermodynamics
Given van der Waals constant for NH3, H2, O2 and CO2 are respectively 4.17, 0.244, 1.36 and 3.59, which one of the following gases is most easily liquefied?
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2018 (2 sets)
- A. O2
- B. CO2
- C. H2
- D. NH3
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Q170
CHEMISTRY
Unit 5: Solutions
The solubility of BaSO4 in water is 2.42 × 10−3 g L−1 at 298 K. The value of its solubility product (Ksp) will be (Given molar mass of BaSO4 = 233 g mol−1)
↻ Repeated question — also appeared in
2018 (1 set)
- A. 1.08 × 10−14 mol2 L−2
- B. 1.08 × 10−8 mol2 L−2
- C. 1.08 × 10−12 mol2 L−2
- D. 1.08 × 10−10 mol2 L−2
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Q172
CHEMISTRY
Unit 19: Biomolecules
Which of the following compounds can form a zwitterion?
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2018 (9 sets)
- A. Benzoic acid
- B. Glycine
- C. Acetanilide
- D. Aniline
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Q173
CHEMISTRY
Unit 15: Hydrocarbons
The compound C7H8 undergoes the following reactions: The product ‘C’ is
↻ Repeated question — also appeared in
2018 (2 sets)
- A. 3-bromo-2,4,6-trichlorotoluene
- B. p-bromotoluene
- C. o-bromotoluene
- D. m-bromotoluene
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Q174
CHEMISTRY
Unit 10: p-Block Elements
Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity?
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2018 (8 sets)
- A. N2O
- B. NO
- C. NO2
- D. N2O5
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Q174
CHEMISTRY
Unit 10: p-Block Elements
Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity?
↻ Repeated question — also appeared in
2018 (8 sets)
- A. N2O
- B. NO
- C. NO2
- D. N2O5
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Q175
CHEMISTRY
Unit 17: Organic Compounds Containing Oxygen
The compound A on treatment with Na gives B, and with PCl5 gives C. B and C react together to give diethyl ether. A, B and C are in the order
↻ Repeated question — also appeared in
2018 (14 sets)
- A. C2H5Cl, C2H6, C2H5OH
- B. C2H5OH, C2H5ONa, C2H5Cl
- C. C2H5OH, C2H5Cl, C2H5ONa
- D. C2H5OH, C2H6, C2H5Cl
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Q175
CHEMISTRY
Unit 17: Organic Compounds Containing Oxygen
The compound A on treatment with Na gives B, and with PCl5 gives C. B and C react together to give diethyl ether. A, B and C are in the order
↻ Repeated question — also appeared in
2018 (14 sets)
- A. C2H5Cl, C2H6, C2H5OH
- B. C2H5OH, C2H5ONa, C2H5Cl
- C. C2H5OH, C2H5Cl, C2H5ONa
- D. C2H5OH, C2H6, C2H5Cl
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Q176
CHEMISTRY
Unit 15: Hydrocarbons
Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is
↻ Repeated question — also appeared in
2018 (16 sets)
- A. CH3–CH3
- B. CH4
- C. CH2=CH2
- D. CH≡CH
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Q176
CHEMISTRY
Unit 15: Hydrocarbons
Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to a gaseous hydrocarbon containing less than four carbon atoms. (A) is
↻ Repeated question — also appeared in
2018 (16 sets)
- A. CH3–CH3
- B. CH4
- C. CH2=CH2
- D. CH≡CH
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Q177
CHEMISTRY
Unit 3: Chemical Bonding and Molecular Structure
Consider the following species: CN+, CN−, NO and CN. Which one of these will have the highest bond order?
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2018 (14 sets)
- A. CN+
- B. CN
- C. CN−
- D. NO
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Q177
CHEMISTRY
Unit 3: Chemical Bonding and Molecular Structure
Consider the following species: CN+, CN−, NO and CN. Which one of these will have the highest bond order?
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2018 (14 sets)
- A. CN+
- B. CN
- C. CN−
- D. NO
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Q178
CHEMISTRY
Unit 3: Chemical Bonding and Molecular Structure
Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s2 2s2 2p3, the simplest formula for this compound is
↻ Repeated question — also appeared in
2018 (13 sets)
- A. Mg2X
- B. Mg3X2
- C. MgX2
- D. Mg2X3
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Q179
PHYSICS
Unit 7: Properties of Solids and Liquids
Iron exhibits bcc structure at room temperature. Above 900°C, it transforms to fcc structure. The ratio of density of iron at room temperature to that at 900°C (assuming molar mass and atomic radii of iron remain constant with temperature) is
↻ Repeated question — also appeared in
2018 (8 sets)
- A. 2√3/3
- B. 2/1
- C. 2√3/4
- D. 2/3
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Q180
CHEMISTRY
Unit 2: Atomic Structure
Which one is a wrong statement?
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- A. The electronic configuration of N atom is
- B. The value of m for 2dz2 is zero.
- C. An orbital is designated by three quantum numbers while an electron in an atom is designated by four quantum numbers.
- D. Total orbital angular momentum of electron in s orbital is equal to zero.
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