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21st February 2015, 11:56 AM
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Join Date: Apr 2013
Re: PCMB Previous years question papers

Hello friend as you want the previous years question papers PCMB so here I am providing you the same…….

PART-A
Answer the following questions in One Word or One Sentence each: - 1Ox1=10
1. Name the hormone that induces rupturing of Graafian follicle.
2. Sertoli cells are very much essential during spermatogenesis. Why?
3. Define convergent evolution.
4. Name the test conducted to confirm Typhoid fever.
5. What is micropropagation?
6. What are Flocs?
7. Mention the uniqueness of DNA polymerase used in PCR.
8. Mention the reason behind auto-immune disease.
9. Why Western Ghats are considered as one of the biodiversity hotspots?
10. "Some animals, if unable to migrate, might avoid the stress by escaping in time". Justify the statement
citing one example.

PART-B
.Answer any FlVE of the following questions in 3-5 sentences each, wherever applicable: 5~2.10
11. What is parthenogenesis? Name an animal showing this.
12. Differentiate between incomplete dominance and co dominance.
13. "Darwin's finches represent one of the best examples for adaptive radiation". Comment.
14. Draw a neat labeled diagram of an antibody molecule.
15. List the objectives of biofortification.
16. Draw a neat labeled diagram of sparged stirred tank bioreactor.
17. Write a note on co-extinction.
18. "India is rich in genetic diversity". Justify this statement by giving two examples.

PART-C
Answer any FIVE of the following Questions in 40-80 words each, wherever applicable. 5x3=15
19. Name the following:
i) Asexual reproductive structures of Hydra.
ii) Vegetative propagules of Agave.
iii)The plant that flowers once in twelve years.
20. Differentiate between microsporogenesis and megasporogenesis.
21. Write the pedigree analysis chart for myotonic dystrophy. Mention the importance of pedigree
analysis.

PART – A
I Answer the following 10 x 1 = 10
1. Write the dimensional formula for linear momentum.
2. What is unit vector?
3. Define workdone by the force.
4. Define radius of gyration.
5. What is the weight of a body at the centre of the earth?
6. Name the SI unit of stress.
7. What is streamline flow?
8. Mention the of degrees of freedom for a triatomic gas molecule.
9. Write Newton’s formula for speed of sound in air.
10. Define amplitude of a wave.

PART – B
II. Answer any FIVE of the following questions 5×2 = 10
11. Name any two fundamental forces in nature.
12. Mention any uses of dimensional analysis.
13. State triangle law of vector addition.
14. Mention any two methods of reducing friction.
15. Define average velocity and instantaneous velocity.
16. State and explain first law of thermodynamics.
17. Write the relation between g and G and explain the terms.
18. Mention an expression for the period of oscillation of a spring and explain the terms.

PART – C
III. Answer any FIVE of the following Questions 5×3 = 15
19. Obtain an expression for time of flight of a projectile.
20. Using Newton’s second law of motion , arrive at F = ma
21. Derive an expression for kinetic energy.
22. Mention the three types of moduli of elasticity.
23. State and explain Bernoulli’s principle.
24. Define a)Specific heat of gas at constant volume b) Specific heat of gas at constant pressure c)Latent heat of fusion.
25. Write any three postulates of kinetic theory of gasses.
26. Give any three differences between progressive wave and a stationary wave.


PART – D
IV. Answer any TWO of the following Questions 2×5 = 10
27. What is uniform circular motion? Derive an expression for centripetal acceleration.
28. State and explain a) Parallel axis theorem and b) perpendicular axes theorem.
29. Derive an expression for maximum speed of a car moving on banked circular road.

V. Answer any TWO of the following Questions 2×5 = 10
30. Define Orbital speed of a satellite. Obtain an expression for the orbital speed of satellite.
31. State and explain the Newton’s law of cooling.
32. What is SHM? Write its characteristics and give its graphical representation.

PART – E
VI. Answer any THREE of the following. 3×5 = 15
33. A stone is dropped from top of a tower 100m height. At the same instant another stone is thrown vertically upward from the base of the tower with the velocity of 25m/s. When and where will the two stones meet? Given g = 10 m/s2.
34. A bullet of mass 0.015kg strikes a metal plate of thickness 10cm with a velocity of 400m/s and emerge from it with a velocity of 260m/s. Find the average resistance offered by the plate to the motion of bullet.
35. A fly wheel of mass 12.5kg and diameter 0.36m rotating at 90rpm has its speed increased to 720rpm in 8s. Find the torque applied to flywheel.
36. A Carnot engine has an efficiency of 0.3, when the temperature of the sink is 350K. Find the change in temperature of the source when the efficiency becomes 0.5.
37. A train is moving at speed of 72kmph towards a station , is sounding a whistle of frequency 600Hz. What are the apparent frequencies of the whistle as heard by a man on the plot form when the train a) approaches him b)recedes from him?(speed of sound in air = 340m/s)


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