Q1
mcq
1 mark
Magnification of a convex lens is always:
- A. Positive
- B. Negative
- C. Either positive (or) negative
- D. Zero
Correct Answer: C —
Solution
The magnification of a convex lens can be either positive or negative. It is positive when the image formed is virtual and erect, and negative when the image is real and inverted. So the correct answer is (c).
Q2
mcq
1 mark
In which of the following reaction, the mass number decreases by four of the daughter nucleus?
- A. $\alpha$ decay
- B. $\beta$ decay
- C. $\gamma$ decay
- D. neutron decay
Correct Answer: A —
Solution
In $α$ decay, the nucleus emits an alpha particle, which consists of 2 protons and 2 neutrons. Therefore, the mass number of the daughter nucleus decreases by 4. Hence, the correct answer is (a).
Q3
mcq
1 mark
The gram molecular mass of water is:
- A. 2 g
- B. 16 g
- C. 18 g
- D. 8 g
Correct Answer: C —
Solution
The gram molecular mass of water is the molecular mass expressed in grams. For water, $H_2O = 2(1) + 16 = 18$. Therefore, the gram molecular mass of water is 18 g. So the correct answer is (c).
Q4
mcq
1 mark
Which of the following is the universal solvent?
- A. Acetone
- B. Benzene
- C. Water
- D. Alcohol
Correct Answer: C —
Solution
Water is called the universal solvent because it dissolves a large number of substances compared with other liquids. Hence, the correct answer is (c).
Q5
mcq
1 mark
The secondary suffix used in IUPAC nomenclature of an aldehyde is __________.
- A. -ol
- B. -oic acid
- C. -al
- D. -one
Correct Answer: C —
Solution
In IUPAC nomenclature, the secondary suffix for an aldehyde is $-al$. Therefore, the correct answer is (c).
Q6
mcq
1 mark
The heart of amphibians possess __________ chambers.
- A. 3
- B. 4
- C. 2
- D. 5
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Q7
mcq
1 mark
Kreb’s cycle takes place in __________.
- A. chloroplast
- B. mitochondrial matrix
- C. stomata
- D. inner mitochondrial membrane
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Q8
mcq
1 mark
Bipolar neurons are found in:
- A. retina of eye
- B. cerebral cortex
- C. embryo
- D. respiratory epithelium
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Q9
mcq
1 mark
Syngamy results in the formation of __________.
- A. zoospores
- B. conidia
- C. zygote
- D. chlamydospores
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Q10
mcq
1 mark
Match the following:
(1) Sarcoma
(2) Carcinoma
(3) Polydipsia
(4) Polyphagia
- A. (1)-(iii), (2)-(iv), (3)-(ii), (4)-(i)
- B. (1)-(iv), (2)-(iii), (3)-(i), (4)-(ii)
- C. (1)-(i), (2)-(iii), (3)-(iv), (4)-(ii)
- D. (1)-(iv), (2)-(i), (3)-(ii), (4)-(iii)
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Q11
mcq
1 mark
9 : 3 : 3 : 1 ratio is due to:
- A. Segregation
- B. Crossing over
- C. Independent assortment
- D. Recessiveness
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Q12
mcq
1 mark
The term Ethnobotany was coined by:
- A. Khorana
- B. J.W. Harshberger
- C. Ronald Ross
- D. Hugo de Vries
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Q16
short answer
Mention any two applications of Avogadro’s Law.
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Q17
short answer
List out the parasitic adaptations in leech.
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Q18
short answer
What are the structures involved in the protection of brain?
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Q19
short answer
Identify the parts A, B, C and D in the given figure.
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Q22
short answer
Calculate the amount of energy released when a radioactive substance undergoes fusion and results in a mass defect of 2 kg.
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Q23
long answer
Deduce the equation of force using Newton’s Second Law of Motion.
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Q24
long answer
Differentiate the eye defects : Myopia and Hypermetropia.
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Q25
short answer
(a)What do you understand by the term Ultrasonic Vibration ?
(b)What is meant by reflection of sound ?
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Q26
short answer
(a)What is an amalgam ? Give an example.
(b)Mention any two uses of copper.
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Q27
long answer
Explain the mechanism of cleansing action of soap.
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Q28
short answer
(a)Name the three basic tissue systems in a flowering plant.
(b)What are the factors affecting photosynthesis ?
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Q30
long answer
How do rainwater harvesting structures recharge ground water ?
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Q31
short answer
(a)What do you understand by the term phenotype and geno type ?
(b)What are allosomes ?
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Q32
short answer
(a)Calculate the pH of 0.01 M solution of HNO3.
(b)A solution is prepared by dissolving 25 g sugar in 100 g of water. Calculate the mass percentage of solute.
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Q33
long answer
(a)(i)State Joule’s Law of Heating.
(ii)An alloy of nickel and chromium is used as the heatin g element. Why ?
(iii)How does a fuse wire protect electrical appliances ?
OR
(b)(i)What is a longitudinal wave ?
(ii)What is a nuclear reactor ? Explain its essential p arts with their functions.
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Q34
long answer
(a)(i)Define : Atomicity.
(ii)Calculate the percentage of sulphur in H2SO4.
(iii)In what way hygroscopic substances differ from deliquescent substances.
OR
(b)(i)Differentiate reversible and irreversible reaction.
(ii)What is neutralization reaction ? Give an example.
(iii)Give any three characteristics of homologous series.
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Q35
long answer
(a)(i)Which hormone induces parthenocarpy in tomatoes ?
(ii)Why is thyroid hormone referred as ‘personality hormone’ ?
(iii)Explain Lamarck’s theories of evolution.
OR
(b)(i)Which enzyme cuts DNA at specific sites ?
(ii)Name two maize hybrids rich in amino-acid, lysi
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Q37
short answer
Calculate the percentage of sulphur in $H_2SO_4$.
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Q38
short answer
In what way hygroscopic substances differ from deliquescent substances.
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Q39
short answer
Differentiate reversible and irreversible reaction.
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Q40
short answer
What is neutralization reaction ? Give an example.
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Q41
short answer
Give any three characteristics of homologous series.
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Q42
short answer
Which hormone induces parthenocarpy in tomatoes ?
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Q43
short answer
Why is thyroid hormone referred as ‘personality hormone’ ?
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Q45
short answer
Which enzyme cuts DNA at specific sites ?
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Q46
short answer
Name two maize hybrids rich in amino-acid, lysine.
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Q47
short answer
Explain smoking hazards and the harmful effects of tobacco.
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