CET / SIET SCHOLARSHIP PRACTICE-TEST 05 (SUBJECT: PHYSICS)

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"Please Answer all the Questions to know the correct Answers in view score after submission" .

(Estimated Answering Time Duration: 60 Min to 75 Min)

1.Joule-second is the unit of

1 point

A. Work

B. Momentum

C. Pressure

D. Angular momentum

Clear selection

2. The mass of a box measured by a grocer’s balance is 2.3 kg. Two gold pieces of masses 20.15 g and 20.17 g are added o the box. The total mass of the box is

1 point

A. 2.3 kg

B.2.34 kg

C.2.340 kg

D.2.3403 kg

Clear selection

3.The numerical ratio of displacement to the distance covered is always

1 point

A. Less than one

B. Equal to one

C. Equal to or less than one

D. Equal to or greater than one

Clear selection

4 A body covers a distance of 4 m in 3rd second and 12 m in 5th second. If the motion is uniformly accelerated. How far will it travel in the next 3 second?

1 point

A. 10 m

B. 30 m

C. 40 m

D. 60 m

Clear selection

5. A man projects a coin upwards from the gate of a uniformly moving train. The path of coin for the man will be

1 point

A. Parabolic

B. Inclined straight line

C. Vertical straight line

D. Horizontal straight line

Clear selection

6. A flag is mounted on a car moving due North with velocity of 20km/hr. strong winds are blowing due East with velocity of 20 km/hr. The flag will point in direction

1 point

A. East

B. North-East

C. South-East

D. South-west

Clear selection

1 point

A.32 kg

B. 40 kg

C. 42 kg

D. 48 kg

Clear selection

8. A bird weighs 2 kg and is inside a closed cage of 1 kg. if starts flying, then what is the weight of the bird and cage assembly?

1 point

A.1.5 kg

B. 2.5 kg

C. 3 kg

D. 4 kg

Clear selection

1 point

A.14.8 km

B. 14.8 m

C. 29.6 km

D. 29.6 m

Clear selection

10.

1 point

Clear selection

11. A body of mass 4 kg is moving with momentum of 8 kg m/s. A force of 0.2 N acts on it in the direction of motion of the body for 10 s. The increase in kinetic energy is

1 point

A. 10 J

B. 8.5 J

C. 4.5 J

D. 4J

Clear selection

12. A raindrop of mass 1 g falling from a height of 1 km hits the ground with a speed of 50 m/s. if the resistive force is proportional to the speed of the drop, then the work done by the resistive force is (Take g:10 m/s2)

1 point

A. 10 J

B. -10 J

C. 8.75 J

D. -8.75 J

Clear selection

13. The velocity of centre of mass of the system remains constant, if the total external force acting on the system is

1 point

A. Minimum

B. Maximum

C. Unity

D. Zero

Clear selection

14. A person is standing on a rotating table with metal spheres in his hands. If he withdraws his hands to his chest, then the effect on his angular velocity will be

1 point

A. Increase

B. Decrease

C. Remain same

D. Can’t say

Clear selection

15. The mass moon is 1% of mass of the earth . the ratio of gravitation pull of the earth on the moon and that of the moon on the earth will be

1 point

A. 1:1

B. 1:10

C. 1:100

D. 2:1

Clear selection

16. A Satellite is moving around the earth with speed v in a circular orbit of radius r . if the radius is decreased by 1% ,its speed will

1 point

A. Increased by 1%

B. Increased by 0.5%

C. Decreased by 1%

D. Decreased by 0.5%

Clear selection

17. A copper and steel wire of the same diameter are connected end to end . a deforming force F applied to this composite wire which cause a total elongation of 1cm. the two wires will have

1 point

A. The same stress and strain

B. The same stress but different strain

C. The same stain but different stress

D. Different stress and different strain

Clear selection

18. The dimensions of wires of the same material are given below. In which wire the increase in length will be maximum when the same tension is applied

1 point

A. Length 100cm,diameter 1mm

B. Length 200cm,diameter 2mm

C. Length 300cm,diameter 3mm

D. Length 50cm,diameter 0.5mm

Clear selection

19. A block of ice floats on a liquid of density 1.2 in a beaker then the level of liquid when ice completely melts

1 point

A. Remains same

B. Rises

C. Lowers

D. (A),(B) and (C)

Clear selection

20. What is the ratio of surface energy of 1 small drop and 1 large drop, if 1000 small drops combined to form 1large drop

1 point

A.100:1

B.1000:1

C.10:1

D.1:1000

Clear selection

21.

1 point

A.1g

B.2g

C.4

D.8g

Clear selection

22. Two vessels of different materials are similar in size in every respect. The quantity of ice filled in themGets melted in 20min and 40min respectively. The ratio of there thermal conductivities of the material is

1 point

A. 5:6

B. 6:5

C. 3:1

D. 2:1

Clear selection

23. A gas mixture consists of 2mole of oxygen and 4 mole of argon at temperature T. neglecting all vibrational modes, the total internal energy of the system is

1 point

A .4RT

B. 15RT

C. 9RT

D. 4.11RT

Clear selection

24. The ratio of molar heat capacities of diatomic gas at constant pressure to that at constant volume is

1 point

A. 7/5

B. 3/2

C. 3/5

D. 5/2

Clear selection

25. The gas is compressed adiabatically till its temperature is double. the ratio of its final volume to initial volume will be

1 point

A. 1/2

B. More than 1/2

C. Less than 1/2

D. Between 1 and 2

Clear selection

26. In a given process for an ideal gas, dw=0 and dQ<0 then for the gas

1 point

A. The temperature will be decrease

B. The volume will increase

C. The pressure will remain constant

D. The temperature will increases

Clear selection

27. On a planet a freely falling body takes 2 sec when it is dropped from a height of 8 m, the time period of simple pendulum of length 1 m on that planet is

1 point

A. 3.14 s

B. 16.28 s

C. 1.57 s

D. None of these

Clear selection

28. If a simple pendulum is taken to place where g decreases by 2%, then the time period

1 point

A. Decreases by 1%

B. Increases by 2%

C. Decreases by 2%

D. Increases by 1%

Clear selection

29. A travelling wave passes a point of observation. At this point, the time interval between successive crests is 0.2 second and

1 point

A. The wavelength is 5 m

B. The frequency is 5 Hz

C. The velocity of propagation is 5 m/s

D. The wavelength is 0.2 m

Clear selection

30. In a resonance pipe the first and second resonances are obtained at depths 22.7 cm and 70.2 cm respectively. What will be the end correction?

1 point

A.1.05 cm

B.115.5 cm

C. 92.5 cm

D.113.5 cm

Clear selection

31. Five balls numbered 1 to 5 are suspended using separate threads. Pairs (1, 2), (2, 4), and (4, 1) show electro statistic attraction, while pair (2, 3) and (4,5) show repulsion. Therefore ball 1 must be

1 point

A. Positively charged

B. Negatively charged

C. Neutral

D. Made of metal

Clear selection

32.The electric field due to an electric dipole at a distance r from its centre in axial position is E. If the dipole is rotated through an angle of 900 about its perpendicular axis, the electric field at the same point will be

1 point

A. E

B. E/4

C. E/2

D. 2E

Clear selection

33. If a charged spherical conductor of radius 10 cm has potential V at a point distant 5 cm from its centre, then the potential at a point distant 15 cm from the centre will be

1 point

A. 1/3 V

B. 2/3 V

C. 3/2 V

D. 3 V

Clear selection

34. A parallel plate capacitor is charged and the charging battery is then disconnected. If the plates of the capacitor are moved further apart by means of insulating handles, then

1 point

A. The charge on the capacitor increases

B. The voltage across the plates decreases

C. The capacitance increases

D. The electrostatic energy stored in the capacitor increases

Clear selection

35. On increasing the temperature of a conductor, its resistance increases because

1 point

A. Relaxation time decreases

B. Mass of the electrons increases

C. Electron density decreases

D. None of the above

Clear selection

36. A battery of 24 cells, each of emf 1.5 V and internal resistance 2 Ω is to be connected in order to send the maximum current through a 12 Ω resistor. The Correct arrangement of cells will be

1 point

A. 2 rows of 12 cells connected in parallel

B. 3 rows of 8 cells connected in parallel

C. 4 rows of 6 cells connected in parallel

D. All of these

Clear selection

37. Magnetic fields at two points on the axis of a circular coil at a distance of 0.05 m and 0.2 m from the centre are in the ratio 8:1. The radius of the coil is

1 point

A. 1.0 m

B. 0.1 m

C. 0.15 m

D. 0.2 m

Clear selection

38. A current of 10 amphere is flowing in a wire of length 1.5 m. A force of 15 N acts on it when it is placed in a uniform magnetic field of 2 tesla. The angle between the magnetic field and the direction of the current is

1 point

Clear selection

39.

1 point

A. 0.2 A

B. 0.3 A

C. 0.4 A

D. 0.5 A

Clear selection

40. A bar magnet is oscillating in the earth’s magnetic field with time period T. If its mass is increased four times then its time period will be

1 point

A. 4 T

B. 2 T

C. T

D. T/2

Clear selection

41. A rod of length 20 cm is rotating with angular speed of 100 rps in a magnetic field of strength 0.5 T about its one end. What is the potential difference between two ends of the rod

1 point

A.2.28 V

B. 4.28 V

C. 6.28 V

D. 2.5 V

Clear selection

42. The equivalent inductance of two inductances is 2.4 Henry when connected in parallel and 10 Henry when connected in series. The difference between the two inductances is

1 point

A. 2 Henry

B. 3 Henry

C. 4 Henry

D. 5 Henry

Clear selection

43. A 20V ac is applied to a circuit consisting of a resistance and a coil is negligible resistance, if the voltage across the resistance is 12V, the voltage across the coil is

1 point

A.15V

B.10V

C.8V

D.6V

Clear selection

44. What is the r.m.s. value of an alternating current which when passed through a resister produces heat which is thrice of that produced by a direct current of 2 ampere in the same resister ?

1 point

A.6A

B.2A

C.3.46A

D.0.66A

Clear selection

45. Radius of curvature of concave mirror is 40cm and the size of the image is twice that of object, then the object distance is

1 point

A.60cm

B. 20cm

C. 40cm

D. 30cm

Clear selection

46. The plane surface of Plano-convex lens of focal length f is silvered. It will behave as

1 point

A. Plane mirror

B. Convex mirror of focal length 2f

C. Concave mirror of focal length f/2

D. None of the above

Clear selection

47. Ray diverging from a point source from a wave front that is

1 point

A. Cylindrical

B. Spherical

C. Plane

D. Cubical

Clear selection

48. In Young’s experiment, the distance between slits is reduced to half and the distance between the slit and screen is and doubled, then the fringe width

1 point

A. Will not change

B. become half

C. Will be doubled

D. Will become four times

Clear selection

49. Which radiation is sun light, causes heating effect

1 point

A. Ultraviolet

B. Infrared

C. Visible light

D. All of there

Clear selection

50. Which of the fallowing are not electromagnetic wave

1 point

A. Cosmic rays

B. Gamma rays

C. Beta Ray

D. X-ray

Clear selection

51. As intensity of incident light increases

1 point

A. Photoelectric current increases

B. Photoelectric current decreases

C. Kinetic energy of emitted photoelectron increases

D. Kinetic energy of emitted photoelectron decreases

Clear selection

52. When wavelength of incident photon is decreases then

1 point

A. Velocity of emitted photo-electron decreased

B. Velocity of emitted photo-electron increased

C. Velocity of photo electron does not change

D. Photo electric current increases

Option 5

Clear selection

53. In which of the following system will the radius of the first orbit (n=1) be minimum

1 point

A. Single ionized helium

B .Deuterium

C. Hydrogen atom

D .Doubly ionized lithium

Clear selection

54. An energy of 24.6eV is required to remove one of the electron from a neutral helium atom. The energy required to remove both the electron from a neutral helium atom is

1 point

A. 79.0

B. 51.8

C. 49.2

D. 38.2

Clear selection

55. Outside a nucleus is

1 point

A. Neutron stable

B. Proton and neutron both stable

C. Neutron is unstable

D. Neither neutron nor proton is stable

Clear selection

56. A Chain reaction is continuous due to

1 point

A. Large mass defect

B .Large energy

C .Production of more electron in fusion

D. None of these

Clear selection

57. To obtain P-type semiconcuctor,we need to dope pure Si with

1 point

A. Aluminum

B. Phosphorous

C. Oxygen

D. Germanium

Clear selection

58. The forbidden Gap in the energy bands of germanium at room temperature is about

1 point

A.1.1eV

B.0.1eV

C.0.67eV

D.6.7Ev

Clear selection

59. In which frequency range, space wave are normally propagated

1 point

A.HF

B.VHF

C.UHF

D.SHF

Clear selection

60. Broadcasting antennas are generally

1 point

A. Omni directional

B. Vertical type

C. Horizontal type

D. None of these

Clear selection

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