2. SECTION – A Single Correct Answer Type There are five parts in this question. Four choices are given for each part and one of them is correct. Indicate you choice of the correct answer for each part in your answer-book by writing the letter (a), (b), (c) or (d) whichever is appropriate
3. Problem 01 Two forces of magnitude 8N and 15N respectively act at a point so as to make the resultant force 17 N. The angle between the forces is 120° 90° 45° 25°
4. Problem 02 A particle is projected making an angle 45° with the horizontal having kinetic energy K. The kinetic energy at highest point will be K/y/2 KJ2 2K K
5. Problem 03 A cricket ball of mass 250 g collides with a bat with velocity lOm/s and returns with same velocity within 0.01 sec. The force acted on bat is 25 N 50 N 250 N 500 N
6. Problem 04 A jet engine works on the principle of conservation of linear momentum conservation of mass conservation of energy conservation of angular momentum
7. Problem 05 The maximum speed of a vehicle, so that it should not skid over curved path, is a. b. c. d.
8. Problem 06 A car is racing on a circular track of 180 m radius with a speed of 32 ms-1. What should be the banking angle of the road to avoid changes of skidding of the vehicle at this speed without taking into consideration the friction between the tyre and the road ? 45° 60° 30° 15°
9. Problem 07 A disc of moment of inertia kg m2 is rotating at 600 rpm. If the frequency of rotation changes from 600 rpm to 300 rpm then what is the work done ? 1470 J 1452 J 1567 J 1632 J
10. Problem 08 An adiabatic process occurs at constant temperature pressure heat temperature and pressure
11. Problem 09 If a Carnot engine is working with source temperature at 227°C and sink temperature at 27°C, its efficiency will be 40% 10% 67% 50%
12. Problem 10 Efficiency of a Carnot engine is 50% when temperature of sink is 500 K. In order to increase efficiency up to 60% keeping temperature of source remains the same, temperature of sink is 200 K 400 K 600 K 800 K
13. Problem 11 If the ratio of amplitude of two superposed waves is 2 : 1, then the ratio of maximum intensity and minimum intensity is 9:1 1 : 9 4 : 1 1 : 4
14. Problem 12 The focal length of the lens in a photographic camera is 2 m. What is the power of the lens ? +2 D +50 D +5 D +0.5 D
15. Problem 13 A parallel plate air capacitor is connected to battery. After charging fully, the battery is disconnected and the plates are pulled further apart. The strength of the electric field inside the capacitor would remain unchanged increase decrease oscillate
16. Problem 14 A bulb of 100W, 220V is operated on a line of 110V, then what will be the power consumed ? 25 W 75 W 50 W 90W
17. Problem 15 An electric kettle has two heating elements. One brings it to boil ten minutes and the other in fifteen minutes. If two heating filaments are connected in parallel, the water in kettle will boil in 6 minutes 8 minutes 25 minutes 5 minutes
18. Problem 16 In the series resonance the value of impedance is 3 Ω and the resistance is 4 Ω, then the value of power factor of the circuit is 4/3 3/4 zero infinity
19. Problem 17 "On flowing current in a conducting wire the magnetic field is produced around it." It is a law of Lenz Ampere Ohm Maxwell
20. Problem 18 A radioactive substance has a half-life of four months. Three fourth of the substance will decay will in 12 months 8 months 4 months 3 months
21. Problem 19 In a n-p-n transistor circuit the collector current is 9 mA. If 90% of the electrons emitted reach the collector, then the emitter current is 7 mA 8 mA 9 mA 10 mA
22. Problem 20 Mass defect is known as ionization energy binding energy packing fraction activity
23. Problem 21 I f the distance between the plates of two capacitors is increased then capacitance increase decrease remains constant first increase then decrease
24. Problem 22 Thermions are + vely charged - v e l y charged not charged none of these
25. Problem 23 Surface tension of water will be minimum at 0°C 25°C 60°C 75°C
26. Problem 24 The displacement of a particle moving along straight line depends on time (t) as x = αt3+βt3+ γt + δ The ratio of its initial acceleration to its in velocity depends only on α α and γ β and γ α and β
27. Problem 25 A wire suspended vertically from one of its ends is stretched by attaching a weight of 200 N the lower end. The weight stretches the wire by 1 mm. Then the elastic energy stored in the is 0.2 J 10 J 20 J 0.1 J
28. Problem 26 The length of second pendulum is 1 m on ear If mass and diameter of the planet is double than that of earth, then length becomes lm 2m 0.5 m 4 m
29. Problem 27 Two masses m1 and m2 are suspended together by a massless spring of spring cosntant k. when the masses are in equilibrium, m1 is removed without disturbing the system, then the angular velocity of oscillation of m2 is a. b. c. d.
31. Problem 29 A body is executing simple harmonic motion an angular frequency 2 rad/s. The velocity of the body at 20 mm displacement, when the amplitude of motion is 60 mm, is 40 mm/s 50mm/s 113 mm/s 120 mm/s
32. Problem 30 A pipe open at both the ends produces a note of fundamental frequency f1. When the pipe is kept with ¾ th of its length in water, it produces a note of frequency f2. The ratio of f1/f2 is 4/3 3/4 2 1/2
33. Problem 31 The dimensions of . where ε0 is permittivity of free space and E is electric field are ML-1T-2 ML2T-1 ML2T-1 ML2T-2
34. Problem 32 If an iron ball and a wooden ball of the same radius are released from a height h in vacuum, then time taken by both of them to reach ground, will be unequal exactly equal roughly equal zero
35. Problem 33 The maximum horizontal range of projectile is 400 m. The maximum height attained by it will be 100 m 200 m 400 m 800 m
36. Problem 34 The angular velocity of second's hand of a watch is 0.053 rad/s 0.210 rad/s 0.105 rad/s 0.42 rad/s
37. Problem 35 The density of ice is 0.9 g/c.c. and that of sea water is 1.1 g/c.c. An ice berg of volume V is floating in sea water. The fraction of ice berg above water level is 1/11 2/11 3/11 4/11
38. Problem 36 If length of a closed organ pipe is 1 m and velocity of sound is 330 m/s, then the frequency of first overtone is a. b. c. d.
39. Problem 37 A ray of light is incident on the surface of separation of a medium with the velocity of light at an angle 45° and is refracted in the medium at an angle 30°. What will be the velocity of light in the medium? 1.96 x 108 m/s 2.12 x 108 m/s 3.18 x 108m/s 3. 33 x 108m/s
40. Problem 38 Order of e/m ratio of proton p, a-particle and electron e is e > p > α p > α > e e> α > p none of these
41. Problem 39 The direction of magnetic line of force of a bar magnet is from south to north pole from north to south pole across the bar magnet from south to north pole inside the magnet and from north to south pole outside the magnet
42. Problem 40 The equation of a wave is represented by y = 10"4 sin where y in meter, x in metre and t is in seconds, then the velocity of wave will be 100 m/s 4 m/s 1000 m/s 10 m/s
43. Problem 41 A fan works on the principle of electric dynamo electric motor transformer none of these
44. Problem 42 To obtain a p-type semiconductor, germanium must be doped with arsenic antimony indium phosphorus
45. Problem 43 An a - p a r t i c l e and a proton are accelerated through same potential difference from rest. Find the ratio of their final velocity 4 : 1 1 :1 1: √2 1 : 2
46. Problem 44 An electric lamp is connected to 220 V, 50 Hz supply. Then the peak voltage is 210 V 211V 311V 320 V
47. Problem 45 A hollow metal sphere of radius 10 cm is charged such that the potential on its surface is 80 V. The potential at the centre of the sphere is zero 80 V 800 V 8 V
48. Problem 46 The masses of three wires of copper are in the ratio 1 : 3 : 5 and lengths are in the ratio 5 : 3 : 1 .Then the ratio of their electrical resistance are 1 : 3 : 5 5 : 3 : 1 1 : 15: 25 125:15:1
49. Problem 47 A charge +q is moving upwards vertically. It enters a magnetic field directed to the north. The force on the charged will be towards north south west east
50. Problem 48 The velocity of light in vacuum can be changed by changing frequency amplitude wavelength none of these
51. Problem 49 Why sun has elliptical shape when it rises and sets? It is due to refraction reflection scattering dispersion
52. Problem 50 Rutherford's a-scattering experiment concludes that there is a heavy mass at centre electrons are revolving around the nucleus both (a) and (b) none of these
