CET / SIET SCHOLARSHIP PRACTICE- TEST 1 (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. Volt / Metre is the unit of

1 point

Work

Electric intensity

Potential

Force

Clear selection

2. Percentage errors in the measurement of mass and speed are 2% and 3% respectively. The error in the estimation of kinetic energy obtained by measuring mass and speed will be

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12%

10%

Clear selection

3. The correct statement from the following is

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A body having zero velocity will not necessarily have zero acceleration

A body having zero velocity will necessarily have zero acceleration

A body having uniform speed can have only uniform acceleration

A body having non-uniform velocity will have zero acceleration

Clear selection

4. A man walks on a straight road from his home to a market 2.5km away with a speed of 5 km/h. Finding the market closed, he instantly turns and walks back home with a speed of 7.5 km/h. The average speed of the man over the interval of time 0 to 10 min. Is equal to

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5 km/h

25/4km/h

30/4 km/h

45/8 km/h

Clear selection

5. A ball is thrown upwards and it returns to ground describing a parabolic path. Which of the following remains constant?

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Kinetic energy of the ball

Speed of the ball

Horizontal component of velocity

Vertical component of velocity

Clear selection

6. The greatest height to which a man can throw a stone is h. The greatest distance to which he can throw it will be

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h/2

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7. A body of mass 2 kg is hang on a spring balance mounted vertically in a lift. If the lift descends with an acceleration equal to the acceleration due to gravity ‘g’ the reading on the spring balance will be

1 point

2 kg

(4 x g) kg

(2 x g) kg

Clear selection

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

1 point

1.5 kg

2.5 kg

3 kg

4 kg

Clear selection

9. A block of mass 2 kg rests on a plane inclined at an angle of 30 degree with the horizontal. The coefficient of friction between the block and the surface is 0.7. what will be the frictional force acting on the block

1 point

10.3 N

23.8 N

11.9 N

6.3 N

Clear selection

10. A mass m is revolving in a vertical circle at the end of a string of length 20 cm. By how much does the tension of the string at the lowest point exceed the tension at the topmost point?

1 point

2 mg

4 mg

6 mg

8 mg

Clear selection

11. A cord is used to lower vertically a block of mass M by a distance d with constant downward acceleration g/4. Work done by the cord on the block is

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Mg d/4

3Mg d/4

-3Mg d/4

Mg d

Clear selection

12. A ball of mass M falls from a height h on a floor which the coefficient of restitution is e. The height attained by the ball after two rebound is

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Option 1

Option 2

Option 3

Option 4

Clear selection

13. The moment of inertia of a body depends upon

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Mass of the body

Axis of rotation of the body

Shape and size of the body

All of the above

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14. Total angular momentum of a rotating body remains constant, if the net torque acting on a body is

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Zero

Maximum

Minimum

Unity

Clear selection

15. Which of the following statements is correct regarding the universal gravitational constant G?

1 point

G has same value in all systems of units

The value of G is same everywhere in the universe

The value of G was first experimentally determined by Johannes Kepler

G is a vector quantity

Clear selection

16. A body weighs 250 N on the surface of the earth. How much will it weigh half way down to the centre of the earth?

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125 N

150 N

175 N

250 N

Clear selection

17. The extension of a wire by the application of load is 3 mm. The extension in a wire of the same material and length but half the radius by the same load is

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12mm

0.75mm

15mm

6mm

Clear selection

18. A wire extends 1 mm when a force is applied. Double the force is applied to another wire of same material and length but of the radius of cross section the elongation of the wire in mm will be

1 point

Clear selection

19. The maximum force, in addition to the weight require to pull a wire of 5 cm long from the surface of water at temperature 20 degree Celcius, is 728 dynes. The surface tension of water Is

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7.28 N/cm

7.28 dyne/cm

72.8 dyne/cm

7.98 dyne/cm

Clear selection

20. The amount of heat required to change 1 g (0 degree Celsius ) of ice into water of 100 degree Celsius, is

1 point

716 cal

500 cal

180 cal

100 cal

Clear selection

21. Latent heat of ice is 80 cal/g. a man melts 60g of ice by chewing in 1min. His power is

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4800 W

336 W

1.33 W

0.75 W

Clear selection

22. The amount of heat required to change 1g(0 degree celcius) of ice into water of 100 degree Celcius, is

1 point

716 cal

500 cal

180 cal

100 cal

Clear selection

23. The heat capacity per mole of water is (R is the universal gas constant)

1 point

10R

Clear selection

24. The internal energy of 1g of helium at 100 K and 1atomospheric pressure is

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100 j

1200 j

300 j

500 j

Clear selection

25. When an ideal monatomic gas is heated at constant pressure, fraction of heat energy supplied which increases the internal energy of gas, is

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2/5

3/5

3/7

3/4

Clear selection

26. An ideal refrigerator as a freezer at a temperature of -13 degree Celcius, the coefficient of performance of engine is 5 the temperature of the air(to which heat is rejected) will be

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25 degree Celcius

39 degree Celcius

43 degree Celcius

48 degree Celcius

Clear selection

27. A spring with 10 coils as spring constant K. it is exactly cut into two halves, then each of these new springs will have a spring constant

1 point

k/2

3k/2

Clear selection

28. A particle performing simple harmonic motion along the x-axis with the amplitude 4 cm and a time period 1.2s. the minimum time taken by the piratical to move from X = 2 cm to X = +4cm and back again is given by

1 point

0.6 s

0.4 s

0.3 s

0.2 s

Clear selection

29. The frequency of tuning fork is 384 s and velocity of sound in air is 352 m/s . how for the sound as traversed while fork complete 36 vibration ?

1 point

3 m

13 m

23 m

33 m

Clear selection

30. The fundamental frequency of a string stretched with weight of 4 kg is 256 Hz . the weight required to produce its octave is

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4kg wt

8kg wt

12kg wt

16kg wt

Clear selection

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

1 point

Positively charged

Negatively charged

Neutral

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 90 degree about its perpendicular axis, the electric field at the same point will be

1 point

E/4

E/2

Clear selection

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

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1/3 V

2/3 V

3/2 V

3 V

Clear selection

34. The diameter of each plate of an air capacitor is 4 cm. To make the capacity of this plate capacitor equal to that of 20 cm diameter sphere, the distance between the plates will be

1 point

Option 1

Option 2

Option 3

Option 4

Clear selection

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

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Relaxation time decreases

Mass of the electron increases

Electron density decreases

None of the above

Clear selection

36. Two wires A and B of same material same mass have radius 2r and r. If resistance of wire A is 34Ω, then resistance of B will be

1 point

544 Ω

2725 Ω

68 Ω

17 Ω

Clear selection

37. Magnetic field 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 ration 8:1. The radius of the coil is

1 point

1 m

0.1 m

0.15 m

0.2 m

Clear selection

38. When a certain length of wire is turned into one circular loop, the magnetic induction at the centre of coil due to some current flowing is B1 if the same wire is turned into three loops to make a circular coil, the magnetic induction of the centre of this coil for the same current will be

1 point

9B1

3B1

27B1

Clear selection

39. The magnetic potential at a point on the axis line of a bar magnet of dipole moment M is V. What is the magnetic potential due to a bar magnet of dipole moment M/4 at the same point?

1 point

V/2

V/4

Clear selection

40. Substance in which magnetic moment of a single atom is not zero is known as

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Diamagnetism

Ferromagnetism

Paramagnetism

Ferrimagnetisms

Clear selection

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

1 point

2.28V

4.28V

6.28V

2.5V

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

2 Henry

3 Henry

4 Henry

5 Henry

Clear selection

43. Alternating current cannot be measured by dc ammeter because

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ac cannot passed through dc ammeter

Average value of complete cycle is zero

ac is virtual

ac changes its direction

Clear selection

44. There is a 5Ω resistance in an ac circuit. Inductance of 0.1H is connected with it in series. If equation of ac e.m.f. is 5 sin50t, then the phase difference between current and e.m.f. is

1 point

5/2

5/6

5/4

Clear selection

45. A point object is placed at a distance of 30 cm from a convex mirror of focal length 30 cm. The image will form at

1 point

infinity

Focus

Pole

15cm behind the mirror

Clear selection

46. An object is placed at distance of 40cm in front of a concave mirror of focal length 20cm. The nature of image is

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Real, inverted and of same size

Virtual and erect and of same size

Real and erect and of same size

Virtual and inverted and of same size

Clear selection

47. Angular width(β) of central maximum of a diffraction pattern on a single slit does not depending upon

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Distance between slit and screen

Wavelength of light used

continuous emission spectrum Width of the slit

Frequency of light used

Clear selection

48. In a YDS set up, the fringe pattern is seen on a screen placed at a distance D. The slits are the separated by a distance D and are illuminated by light of wavelength λ. The distance from the central point to the nearest point where the intensity falls to of the maximum is

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λ D/3d

λD/2d

λD/d

λD/4d

Clear selection

49. Wave which cannot travel in vacuum is. Wave which cannot travel in vacuum is

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X-ray

Infrasonic

Ultraviolet

Radio wave

Clear selection

50. One requires 11electron Volt of energy to dissociate a carbon monoxide molecule into carbon and oxygen atoms. The minimum frequency of the appropriate electromagnetic radiation to achieve the dissociation lies in

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Visible region

Infrared region

Ultraviolet region

Micro wave region

Clear selection

51. As the intensity of incident light increases

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Photoelectric current increases

Photoelectric current decreases

Kinetic energy of emitted photo electrons increases

Kinetic energy of emitted photo electrons decreases

Clear selection

52. The energy that should be added to an electron to reduce its de- Broglie wavelength from 1nm to 0.5nm is

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4 times the initial energy

Equal to the initial energy

Twice the initial energy

Thrice the initial energy

Clear selection

53. With the increase in principal quantum number, the energy difference between the two successive energy levels

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Increases

Decreases

Remains constant

Some time increases some time decreases

Clear selection

54. If the wavelength of a first line of the Ballmer series of hydrogen is 6561 Å, the wavelength of the second line of the series should be

1 point

1312 Å

3280 Å

4860 Å

2187 Å

Clear selection

55. Outside a nucleus

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Neutron is stable

Proton and neutron both are stable

Neutron is unstable

Neither neutron nor Proton is stable

Clear selection

56. A chain reaction is continuous due to

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Large mass defect

Large energy

Production of more neutron in fission

None of these

Clear selection

57. Zener diode is fabricated by

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Heavily doping p and n sides of the junction

Heavily doping the p side and lightly doping the n side of the junction

Heavily doping the n side and lightly doping the p side of the junction

Lightly doping p and n sides of the junction

Clear selection

58. In the middle of the depletion layer of a reverse biased PN junction, the

1 point

Potential energy is zero

Electric field is zero

Potential energy is maximum

Electric field is maximum

Clear selection

59. The process of superimposing signal frequency (i,e audio waves) on the carrier wave is known as

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Transmission

Reception

Modulation

Detection

Clear selection

60. Broadcasting antennas are generally

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Omni directional type

Vertical type

Horizontal type

None of the above

Clear selection

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