PHYSICS and CHEMISTRY Answer Key 
1. If the wavelength of sound wave increases the pitch of sound
Ans.: (A) Decreases  2. A metallic wire of specific resistance s is stretched in such a way that its length is doubled and area of cross section is halved. Then the specific resistance of the wire will be
Ans.:(B) s/2 
3. If a glass prism is placed inside water then its dispersive power
(B) Decreases  4. In case of vibration the restoring force is
Ans.:(A) proportional to displacement 
5. A current is passed through a conducting spring. Then the spring
Ans.:(D) remain unchanged  6. The ratio of the masses of two body P and Q is 1:8 and the ratio of the kinetic energy is 2:1, then the ratio of their momentum is
Ans.: (C) 4:1 
7. A spacecraft of mass M moving with velocity v in space explodes and reaks into pieces. After the explosion a mass m of the spacecraft is left statiobnary. The velocity of the other part is
Ans.: (B) Mv/(Mm)  8. The resultant of two vectors of magnitudes 3 unit and 4 unit is 5 unit. The angel between the two vectors is
Ans.: (A) π/2 
9. If the weight of a body is 9.8 kg then the mass of the body is
Ans.: (C) 9.8 kg  10. The dimension of specific gravity is
(A)M^{0}L^{0}T^{0} 
11. A body of mass 10kg is falling vertically with uniform velocity. What is the resisting force of air?
Ans.: (C) 10 kgwt  12. If the electronic charge is 1.6 x 10^{19} C, then the number of electrons passing through a section of wire per second, when the wire carries a current 2A, is
Ans.: (A) 1.25 x10^{17} 
13. The kinetic energy of a body of mass m is E. The momentum of the body is
Ans.: (B) √(2mE)  14. Image formed by a plane mirror is always
Ans.:(C) virtual and of same size 
15. The minimum distance between the source and the reflector, so that an echo is heard is approximately equ; to (velocity of sound in air 332 m/s)
Ans.: (B) 16.6 m  16. A constant force acts on two particles of masses 4kg and 16 kg during which both of them travel a dsitance of s meter. Both particles were initially at rest and they started off at the same time. The ratios of the speeds attained by them is
Ans.: (C) 2:1 
17. If the acceleration due to gravity g, is about 10 m/s^{2} near the surface of the earth, then at the center of the earth g would have an approximate value of
Ans.: (A) Zero  18. In case of an prism, the angel of deviation is greater for
Ans.: (A) violet 
19. Two resistances are joind in parallel whose resultant is 6/5 Ω. One of the resistance wires is broken and the effective resistance becomes 2 Ω. The resistance in ohm of the wire that got broken is
Ans.: (B) 3 Ω  20. The molar gas constant is the same for all gases because, at the same pressur and temperature, equal volumes of all gass have the same
Ans.: (C) number of molecules 
21. If the object is placed at 2f from a convex lens, then
Ans.: (A) a real image is formed at 2f on the other side  22. Which one of the following instrument can be regard as nonohmic resistance
Ans.: (C) diode valve 
23. Among the moving particles (α, β, γ particle), which one or which ones are not deflected by the magnetic field?
Ans.: (D) γ particle  24. An object is placed infornt of two plane mirrors which are perpendicular to each other. The number of images that can be seen by an observer is
Ans.: (D) Infinite 
25. 540 gm of ice at 0°C mixed with 540 gm of water at 80°C. The final temperature of the mixer is
Ans.: (B) 40°C  26. Three resistance each of 4 ohm are connected to form an equilateral triangle. The equivalent resistance between any two corner is
Ans.: (D) 8/3 ohm 
27. _{92}U^{235}, _{92}U^{238} differ as
(C)_{92}U^{235} has three neutrons less  28. Two bulbs when connected in parallel to a source, take 60 W each, The total power consumed when they are connected in series with the same source is
Ans.: (C) 60 W 
29. A train moving with a speed of 36 km/hr takes 14 sec to cross a bridge of length 100m. The length of the train is
Ans.: (B) 60 m  30. The rate of radioactive disintegration increases
Ans.: (A) with the increase of temperature 
31. When a person uses a convex lens as a simple magnifying glass, the object must be placed at a distance
Ans.:(A) less than the focal length  32. The end product of radioactive decays is
Ans.: (B) lead 
33. When a vapor condenses into liquid
Ans.:(B) it rejects heat  34. One surface of a lens is convex and the other is concave. If radii of curvature are r1 and r2 respectively, then the lens will be convex if
Ans.: (C) r1<r2 
35. An object is placed at a distance of f/2 from a convex lens of focal length f. The image will be
Ans.: (C) at 2f, vertual and erect  36. A motor cycle and a car are moving on a horizontal road with same velocity. If they are brought to rest by the application of brakes, which provided equal retardation, then
Ans.: (C) both will stop at a same distance 
37. Choose the correct sequence of substance which is ordered in an increasing order of forces of attraction between the particles
ans.:(D) Oxygen, Water, Sugar  38.In a Tsunami, the entire ocean, form the surface to the bottom, participate in the wave motion. For such waves, the wave speed is given by v=√(gh) where g is the acceleration due to gravity and h=3.0 Km is the depth of the ocean surface. A Tsunami has been detected at a point 250 Km from the shore. How much time would it take to reach the shore
Ans.:(C) 24 Minutes 
39. A thin wire of resistance 4 Ω is bent to form a circle. The resistance across any diameter is
Ans.: (C) 1 Ω  40. The note middle C played om a piano differs from middle C played on a violin because of a difference in
Ans.: (D) harmonics 
41. A batch of five resistors have the same value. The Ratio of the maximum and the minimum resistance that can be made out of them
Ans.: (D) 25:1  42. Which device would most likely be classified as a load in an electrical circuit?
Ans.: (B) Light bulb 
43. At what common temperature a wooden block and a metallic block would be felt equally cold or equally hot when touched?
Ans.: (C) If the temperature of both the blocks equal the temperature of the person touching them  44. The densities of two substances are the ratio 2:3 and their specific heats are in the ratio 4:3. Their thermal capacities per unit volume are in the ratio
Ans.: (C) 8:9 
45. The freezing point on a thermometer is marked 30° and the boiling point is marked as 180°. The reading of the thermometer at 50°C is
Ans.:(C)105°  46. In a nuclear reactor for control rod we use
Ans.: (D) Cadmium 
47. At STP amoung 32 gm of SO_{2},22 gm of CO_{2} and 17 gm of H_{2}O gas
Ans.: (C) SAll gases have equal number of molecules  48. Ideal gas equation for 1 mole of ideal gas is PV=RT, the SI unit of universal gas constant R is
Ans.: (C) J Kg^{1}K^{1} 
49. Two plane mirrors are inclined to each other at an angle θ. A ray of light is reflected first at one mirror and then at the other. The total deviation of the ray is
Ans.: (A) 2θ  50. Two resistance 1 Ω and 3 Ω are connected parallel and the combination is connected to a 2 volt source. The ratio of electric current through the resistance will be
Ans.: (B) 3:1n

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Q)In case of vibration the restoring force is
Ans) (A) proportional to displacement. (Vibration is a too and fro motion,so it always coming back to its original position after a complete vibration,so it is proportional to displacement)
Q) A body of mass 10 kg is falling vertically with uniform velocity.what is the resisting force of air?
Ans (A) 0 (air cannot produce any resisting force of a free falling object)
Q)In case of a prism,the angle of deviation is greater for
Ans (A) Violet (Google search it and see the explanation or open your book and see the picture,you will see the maximum deviation in violet)
Thank you very much Saptorshi. air produce resisting force when a body falling with uniform velocity. Uniform velocity means there are no acceleration on the body. But when a body falling there is a acceleration force g work on it. Resisting force by air destroy the acceleration g and the body falling with uniform velocity.
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