Q11
mcq
1 mark
Which of the following is not an “element + element → compound” type reaction?
- A. C(s) + O2(g) → CO2(g)
- B. 2K(s) + Br2(l) → 2KBr(s)
- C. 2CO(g) + O2(g) → 2CO2(g)
- D. 4Fe(s) + 3O2(g) → 2Fe2O3(s)
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Q12
mcq
Cancer of the epithelial cell is called as __________.
- A. Leukaemia
- B. Sarcoma
- C. Carcinoma
- D. Lipoma
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Q13
short answer
2 marks
What is coefficient of apparent expansion ?
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Q14
short answer
2 marks
Why is tungsten metal used in bulbs but not used as fuse wires ?
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Q14
long answer
Write any three features of natural and artificial radioactivity.
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Q15
short answer
2 marks
What is rust ? Give the equation for the formation of rust.
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Q15
short answer
Name any two devices, which are working on the heating effect of current.
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Q16
short answer
What happens when $\mathrm{MgSO_4\cdot7H_2O}$ is heated? Write the appropriate equation.
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Q17
short answer
Why is sinoatrial node called as pacemaker of heart?
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Q19
short answer
Identify the parts A, B, C and D in the given figure.
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Q19
short answer
Why should the light dependent reaction occur before light independent reaction during photosynthesis?
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Q20
short answer
What is colostrum? How is milk production hormonally regulated?
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Q21
short answer
Why is Euploidy considered to be advantageous to both plants and animals?
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Q22
short answer
If the pH of a solution is 4.5, find the value of its pOH.
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Q23
long answer
Explain the various types of inertia with examples.
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Q25
short answer
What are the consequences of deforestation?
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Q26
short answer
State the applications of DNA finger printing technique.
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Q27
short answer
Name the acid that renders Aluminium passive. Why?
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Q28
short answer
Calculate the number of moles in $1.51\times10^{23}$ molecules of $\mathrm{NH_4Cl}$.
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Q29
short answer
How are Arteries and Veins structurally different from one another?
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Q30
short answer
Define Ethnobotany and write its importance.
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Q32
short answer
What is the least count of travelling microscope ?
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Q34
short answer
State two conditions necessary for hearing an echo.
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Q35
short answer
What are the medical applications of echo ?
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Q36
short answer
How can you calculate the speed of sound using echo ?
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Q37
short answer
Under same conditions of temperature and pressure, if you collect 3 litre of $O_2$, 5 litre of $Cl_2$ and 6 litre of $H_2$, (A)Which has the highest number of molecules ? (B)Which has the lowest number of molecules ?
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Q38
short answer
Give the salient features of ‘Modern Atomic theory’.
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Q39
short answer
How do detergents cause water pollution ?
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Q40
short answer
An organic compound ‘A’ is widely used as a preservative and has the molecular formula $C_2H_4O_2$. This compound reacts with ethanol to form a sweet smelling compound ‘B’, then (A)Identify the compound ‘A’. (B)Write the chemical equation for its reaction with ethanol to form compound ‘B’. (C)Name this process.
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Q41
short answer
What are synthetic auxins ? Give an example.
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Q42
short answer
With a neat labelled diagram, describe the parts of the typical angiospermic ovule.
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Q43
short answer
Who is called the “Father of Indian Green Revolution” ?
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Q44
short answer
Differentiate between out-breeding and in-breeding.
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Q45
short answer
Differentiate between Type-I and Type-II Diabetes mellitus.
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