CET / SIET SCHOLARSHIP PRACTICE-TEST 3 (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. Which pair has the same dimensions?

1 point

A) Work and power

B) Density and relative density

C) Momentum and impulse

D) Stress and strain

Clear selection

2. The dimensional formula for impulse is same the dimensional formula for

1 point

A) Momentum

B) Force

C) Rate of change of momentum

D) Torque

Clear selection

3. A car travels from A to B at a speed of 20km/hr and returns at a speed of 30km/hr. The average speed of the car for the whole journey is

1 point

A) 25km/hr

B) 24km/hr

C) 50km/hr

D) 5km/hr

Clear selection

4. A train has a speed of 60km/h for the first one hour and 40km/h for the next half an hour. Its average speed in km/h is

1 point

A) 50

B) 53.33

C) 48

D) 70

Clear selection

5. If time of flight of a projectile is 10 second. Range is 500 metre. The maximum height attained by it will be

1 point

A) 125 m

B) 50 m

C) 100 m

D) 150 m

Clear selection

6. A motor cyclist going round in a circular track at constant speed has

1 point

A) Constant linear velocity

B) Constant acceleration

C) Constant angular velocity

D) Constant force

Clear selection

7. A person sitting in an open car moving at constant velocity throws a ball vertically up into air. The ball falls

1 point

A) Outside the car

B) In the car to the side of the person

C) In the car to the side of the person

D) Exactly in the hand which threw it up

Clear selection

8. A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads 49N, when the lift is stationary. If the lift moves downward with an acceleration of 5 m/s square, the reading of the spring balance will be

1 point

A) 49 N

B) 24 N

C) 74 N

D) 15 N

Clear selection

9. A car accelerates on a horizontal road due to the force exerted by

1 point

A) The engine of the car

B) The driver of the car

C) The car on the earth

D) The road on the car

Clear selection

10. Which of the following is a self-adjusting force?

1 point

A) Static friction

B) Rolling friction

C) Sliding friction

D) Dynamic friction

Clear selection

11. A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle, the motion of the particle takes place in a plane. It follows that

1 point

A) Its velocity is constant

B) Its acceleration is constant

C) Its kinetic energy is constant

D) It moves in a straight line

Clear selection

12. The energy required to accelerate a car from 10 m/s to 20 m/s is how many times the energy required to accelerate the car from rest to 10m/s

1 point

A) Equal

B) 4 times

C) 2 times

D) 3 times

Clear selection

13. To maintain a rotor at a uniform angular speed of 100 rad/s and engine needs to transmit torque of 100 Nm. The power of the engine is

1 point

10 kW

B) 100 kW

C) 10MW

D) 100 MW

Clear selection

14. A ring solid sphere and a disc are rolling down from the top of the same height, then the sequence to reach on surface is

1 point

A) Ring, disc, sphere

B) Sphere, disc, ring

C) Disc, ring, sphere

D) Sphere, ring, disc

Clear selection

15. The period of a satellite in a circular orbit of radius R is T, the period of another satellite in a circular orbit of radius 4R is

1 point

A) 4T

B) T/4

C) 8T

D) T/8

Clear selection

16. The mass of the moon is about 1.2% of the mass of the earth. Compared to the gravitational force the earth exerts on the moon, the gravitational force the moon exerts on earth

1 point

A) Is the same

B) Is smaller

C) Is grater

D) Varies with its phase

Clear selection

17. Increase in length of a wire is 1 mm when suspended by a weight. If the same weight is suspended on a wire of double its length and double its radius, the increase in length will be

1 point

A) 2mm

B) 0.5mm

C) 4mm

D) 0.25mm

Clear selection

18. A uniform cube is subjected to volume compression. If each side is decreased by 1%, then bulk strain is

1 point

A) 0.01

B) 0.06

C) 0.02

D) 0.03

Clear selection

19. At what speed the velocity head of a stream of water be equal to 40cm of Hg

1 point

A) 282.8cm/s

B) 432.6cm/s

C) 632.6cm/s

D) 832.6cm/s

Option 5

Clear selection

20. A square plate of 0.1m side moves parallel to a second plate with a velocity of 0.1m/s, both plates being immersed in water. If the viscous force is 0.002N and the coefficient of viscosity is 0.01poise, distance between the plates in m is

1 point

A) 0.1

B) 0.05

C) 0.005

D) 0.0005

Clear selection

21. 540g of ice at 00C is mixed with 540g of water at 80oC. The final temperature of the mixture is

1 point

0 degree Celsius

B) 40 degree Celsius

C) 80 degree Celsius

D) Less than 0 degree Celsius

Clear selection

22. A container contains hot water at 100 degree Celsius. if in time T1 temperature falls to 80 degree Celsiusand in time T2 temperature falls to 60 degree Celsius from 80 degree Celsius then

1 point

A) T1 = T2

B) T1 > T2

C) T1< T2

D) None

Clear selection

23. A perfect gas at 27 degree Celsius is heated at constant pressure to 327 degree Celsius.if original volume of gas at 27 degree Celsiusis V, then volume at 327 degree Celsius is

1 point

A) V

B) 3V

C) 2V

D) V/2

Clear selection

24. One mole of a monoatomic ideal gas is mixed with one mole of a diatomic ideal gas. The molar specific heat of the mixture at constant volume is

1 point

A) 8

B) 3/2R

C) 2R

D) 2.5R

Clear selection

25. If R = universal gas constant, the amount of heat needed to raise the temperature of 2 mole of an ideal monoatomic gas from 273K to 373K when no work is done.

1 point

A) 100R

B) 150R

C) 300R

D) 500R

Clear selection

26. When heat is given to a gas in an isothermal change, the result will be

1 point

A) External work done

B) Rise in temperature

C) Increase in internal energy

D) External work done and also rise in temp.

Clear selection

27. A mass m attached to a spring oscillates every 2s. If the mass is increased by 2 kg, then time period increases by 1s. The initial mass is

1 point

A) 1.6 kg

B) 3.9 kg

C) 9.6 kg

D) 12.6 kg

Clear selection

28. The time period of a mass suspended from a spring is T. If the spring is cut into four equal parts and the same mass is suspended from one of the parts, then the new time period will be

1 point

A) T

B) T/2

C) 2T

D) T/4

Clear selection

29. The phase difference between the two particles situated on both the sides of a node is

1 point

A) 0 Degree celsius

B) 90 Degree celsius

C) 180 Degree celsius

D) 360 Degree celsius

Clear selection

30. Two closed pipe produce 10 beats per second when emitting their fundamental nodes. If their length are in ratio of 25:26, then their fundamental frequency in Hz, are

1 point

A) 270,280

B) 260,270

C) 260,250

D) 260,280

Clear selection

31. The charges on two spheres are +7μC and -5μC respectively. They experience a force F. If each of them is given and additional charge of -2μC, the new force of attraction will be

1 point

F/2

F/√3

Clear selection

32. A sphere of radius R has a uniform distribution of electric charge in its volume. At a distance x from its centre, for x< R, the electric field is directly proportional to

1 point

A) 1/2x

B) 1/x

C) x

D) 2x

Clear selection

33. Point charge q1 = 2µC and q2 = -1µC are kept at points x = 0 and x = 6 respectively. Electrical potential will be zero at points

1 point

A) x = 2 and x = 9

B) x = 1 and x = 5

C) x = 4 and x = 12

D) x = -2 and x = +2

Clear selection

34. To form a composite 16 µF, 1000V Capacitor from a supply of identical capacitors marked 8 µF, 250V. We require a minimum number of capacitors

1 point

A) 40

B) 32

C) 8

D) 2

Clear selection

35. A voltmeter of resistance 1000Ω gives full scale deflection when a current of 100 mA flow through it. The shunt resistance required across it to enable it to be used as an ammeter reading 1A at full scale deflection is

1 point

A) 10000 Ω

B) 9000 Ω

C) 222 Ω

D) 111 Ω

Clear selection

36. An electric bulb rated for 500 watts at 100 V is used in a circuit having a 200 V supply. The resistance R that must be put in series with the bulb. So that the bulb draws 500 W is

1 point

A) 10 Ω

B) 20 Ω

C) 50 Ω

D) 100 Ω

Clear selection

37. At a distance of 10 cm from a long straight wire carrying current, the magnetic field is 0.04 T. At the distance of 40 cm, the magnetic field will be

1 point

A) 0.01 T

B) 0.02 T

C) 0.08 T

D) 0.16 T

Clear selection

38. The current in the windings on a toroid is 2.0 A. There are 400 turns and the mean circumferential length is 40 cm. If the inside magnetic field is 1.0 T, the relative permeability is near to

1 point

A) 100

B) 200

C) 300

D) 400

Clear selection

39. At a place, if the earth’s horizontal and vertical components of magnetic fields are equal, then the angle of dip will be

1 point

A) 30 degree

B) 90 degree

C) 45 degree

D) 0 degree

Clear selection

40. At a certain place the angle of dip is 30 degree and the horizontal component of earth’s magnetic field is 0.50 Oersted. The earth’s total magnetic field is

1 point

A) √3

B) 1

C) 1 / √3

D) 1 / 2

Clear selection

41. A coil of wire of a certain radius has 600 turns and a self-inductance of 108 mH. The self inductance of a 2nd similar coil of 500 turns will be

1 point

A) 74 mH

B) 75 mH

C) 76 mH

D) 77 mH

Clear selection

42. The current in a coil of inductance 5H decreases at the rate of 2A/s. The induced e.m.f is

1 point

A) 2 V

B) 5 V

C) 10 V

D) – 10 V

Clear selection

43. An ac supply gives 30 V r.m.s which passes through a 10 Ω resistance. The power dissipated in it is

1 point

A) 90 √2 W

B) 90 W

C) 45 √2 W

D) 45 W

Clear selection

44. Power factor is maximum in an LCR circuit when

1 point

A) XL = XC

B) R = 0

C) XL = 0

D) XC = 0

Clear selection

45. A rectangular tank of depth 8 meter is full of water (µ = 4/3), the bottom is seen at the depth

1 point

A) 6 m

B) 8/3 m

C) 8 cm

D) 10 cm

Clear selection

46. A mark at the bottom of a liquid appears to rise by 0.1 m. The depth of the liquid is 1 m. The refractive index of the liquid is

1 point

A) 1.33

B) 9/10

C) 10/9

D) 1.5

Clear selection

47. In young’s doubled slit experiment, if the slit widths are in the ratio 1 : 9, then the ratio of the intensity at minima to that at maxima will be

1 point

A) 1

B) 1/9

C) 1/4

D) 1/3

Clear selection

48. If yellow light in the young’s doubled slit experiments is replaced by red light, the fringe width will

1 point

A) Decrease

B) Remain Un effected

C) increase

D) first increase and then decrease

Clear selection

49. Which of the following rays has the maximum frequency

1 point

A) Gamma rays

B) Blue light

C) Infrared rays

D) Ultraviolet rays

Clear selection

50. The electromagnetic waves do not transport

1 point

A) Energy

B) Charge

C) Momentum

D) Information

Clear selection

51. The kinetic energy of an electron with de-Brogile wavelength of 0.3 nanometer is

1 point

A) 0.168 eV

B) 16.8 eV

C) 1.68 eV

D) 2.5 eV

Clear selection

52. An electron and proton are moving with the same speed. Mass of proton equal to 1836 times mass of electrons. The ratio of their de-Broglie wave length will be

1 point

A) 1

B) 1836

C) 1/1836

D) 918

Clear selection

53. The ionization potential for second He electron is

1 point

A) 13.6 eV

B) 27.2 eV

C) 54.4 eV

D) 100 eV

Clear selection

54. The radius of electron’s second stationary orbit in Bohr’s atom is R. The radius of the third orbit will be

1 point

A) 3R

B) 2.25R

C) 9R

D) R/3

Clear selection

55. If the binding energy of the deuterium is 2.23 MeV, the mass defect given in a.m.u is

1 point

A) -0.0024

B) -0.0012

C) 0.0012

D) 0.0024

Clear selection

56. A free neutron decays into a proton, an electron and

1 point

A) A neutrino

B) An antineutrino

C) An alpha particle

D) A beta particle

Clear selection

57. When the electrical conductivity of a semi-conductor is due to the breaking of its covalent bonds, then the semiconductor is said to be

1 point

A) Donor

B) Acceptor

C) Intrinsic

D) Extrinsic

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58. (USS 133) Indium impurity in germanium makes

1 point

A) N-type

B) P-type

C) Insulator

D) Intrinsic

Clear selection

59. The total power content of an AM wave is 900W. For 100% modulation, the power transmitted by each side band is

1 point

A) 50 W

B) 100 W

C) 150 W

D) 200 W

Clear selection

60. In an FM system, a 7 KHz signal modulates 108MHz carrier so that frequency deviation is 50 kHz. The carrier swing is

1 point

A) 7.143

B) 8

C) 0.71

D) 350

Clear selection

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