CET / SIET SCHOLARSHIP PRACTICE-TEST 04 (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. If a body is in equilibrium under a set of non-collinear forces, then the minimum number of forces has to be

1 point

A) Four

B) Three

C) Two

D) Five

Clear selection

2. A river is flowing from east to west at a speed of 5 m/min. A man on south bank of river, capable of swimming 10m/min in still water, wants to swim across the river in shortest time. He should swim

1 point

A) Due north

B) Due north-east

C) Due north-east with double the speed of river

D) None of these

Clear selection

3. Which of the following quantity is expressed as force per unit area

1 point

A) Work

B) Pressure

C) Volume

D) Area

Clear selection

4. Which pair has the same dimensions

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A) Work and power

B) Density and relative density

C) Momentum and impulse

D) Stress and strain

Clear selection

5. Which of the following is a one dimensional motion

1 point

A) Landing of an aircraft

B) Earth revolving a round the sun

C) Motion of wheels of a moving trains

D) Train running on a straight track

Clear selection

6. A stone is dropped into water from a bridge 44.1 m above the water. Another stone is thrown vertically downward 1 sec later. Both strike the water simultaneously. What was the initial speed of the second stone

1 point

A) 12.25 m / s

B) 14.75 m / s

C) 16.23 m / s

D) 17.15 m / s

Clear selection

7. A body is moving in a circular path with a constant speed. It has

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A) A constant velocity

B) A constant acceleration

C) An acceleration of constant magnitude

D) An acceleration which varies with time

Clear selection

8. A sphere is suspended by a thread of length l . What minimum horizontal velocity has to be imparted the ball for it to reach the height of the suspension

1 point

Clear selection

9. Newton's second law gives the measure of

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A) Acceleration

B) Force

C) Momentum

D) Angular momentum

Clear selection

10. Swimming is possible on account of

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A) First law of motion

B) Second law of motion

C) Third law of motion

D) Newton's law of gravitation

Clear selection

11. Which is a suitable method to decrease friction

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A) Ball and bearings

B) Lubrication

C) Polishing

D) All the above

Clear selection

12. Which one of the following statements is correct

1 point

A) Rolling friction is greater than sliding friction

B) Rolling friction is less than sliding friction

C) Rolling friction is equal to sliding friction

D) Rolling friction and sliding friction are same

Clear selection

13. The force constant of a wire is k and that of another wire is 2k. When both the wires are stretched through same distance, then the work done

1 point

Clear selection

14. If the unit of force and length each be increased by four times, then the unit of energy is increased by

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A) 16 times

B) 8 times

C) 2 times

D) 4 times

Clear selection

15. The weight of a body at the centre of the earth is

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A) Zero

B) Infinite

C) Same as on the surface of earth

D) None of the above

Clear selection

16. If the earth stops rotating, the value of ‘g’ at the equator will

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A) Increase

B) Remain same

C) Decrease

D) None of the above

Clear selection

17. The dimensions of four 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 100 cm, Diameter 1 mm

B) Length 200 cm, Diameter 2 mm

C) Length 300 cm, Diameter 3 mm

D) Length 50 cm, Diameter 0.5 mm

Clear selection

18. The ratio of the adiabatic to isothermal elasticities of a triatomic gas is

1 point

A) 3/4

B) 4/3

C) 1

D) 5/3

Clear selection

19. Two pieces of glass plate one upon the other with a little water in between them cannot be separated easily because of

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A) Inertia

B) Pressure

C) Surface tension

D) Viscosity

Clear selection

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

1 point

A) 100 : 1

B) 1000 : 1

C) 10 : 1

D) 1 : 100

Clear selection

21. Two bodies are in equilibrium when suspended in water from the arms of a balance. The mass of one body is 36 g and its density is 9 g / cm. If the mass of the other is 48 g, its density in g / cm is

1 point

A) 4/3

B) 3/2

C) 3

D) 5

Clear selection

22. Pressure applied to an enclosed fluid is transmitted undiminished to every portion of the fluid and the walls of the containing vessel. This law was first formulated by

1 point

A) Bernoulli

B) Archimedes

C) Boyle

D) Pascal

Clear selection

23. The temperature of a substance increases by 27°C. On the Kelvin scale this increase is equal to

1 point

A) 300 K

B) 2.46 K

C) 27 K

D) 7 K

Clear selection

24. When a copper ball is heated, the largest percentage increase will occur in its

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A) Diameter

B) Area

C) Volume

D) Density

Clear selection

25. S.I. unit of universal gas constant is

1 point

Clear selection

26. First law of thermnodynamics is given by

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A) dQ = dU + PdV

B) dQ = dU x PdV

C) dQ = (dU + dV)P

D) dQ = PdU+ dV

Clear selection

27. In an isothermal expansion

1 point

A) Internal energy of the gas increases

B) Internal energy of the gas decreases

C) Internal energy remains unchanged

D) Average kinetic energy of gas molecule decreases

Clear selection

28. For cooking the food, which of the following type of utensil is most suitable

1 point

A) High specific heat and low conductivity

B) High specific heat and high conductivity

C) Low specific heat and low conductivity

D) Low specific heat and high conductivity

Clear selection

29. Mode of transmission of heat, in which heat is carried by the moving particles, is

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A) Radiation

B) Conduction

C) Convection

D) Wave motion

Clear selection

30. The phase of a particle executing simple harmonic motion is π/2 when it has

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A) Maximum velocity

B) Maximum acceleration

C) Maximum energy

D) None of the above

Clear selection

31. The total energy of a particle executing S.H.M. is proportional to

1 point

A) Displacement from equilibrium position

B) Frequency of oscillation

C) Velocity in equilibrium position

D) Square of amplitude of motion

Clear selection

32. The relation between frequency ‘n’ wavelength ‘λ’ and velocity of propagation ‘v’ of wave is

1 point

A) n = v λ

B) n = λ / v

C) n = v / λ

D) n = 1 / v

Clear selection

33. If the phase difference between the two wave is 2π during superposition, then the resultant amplitude is

1 point

A) Maximum

B) Minimum

C) Maximum or minimum

D) None of the above

Clear selection

34. The electric field E, current density J and conductivity σ of a conductor are related as

1 point

A) σ = E / j

B) σ = j / E

C) σ = jE

D) σ = 1 / jE

Clear selection

35. The lowest resistance which can be obtained by connecting 10 resistors each of 1/10 ohm is

1 point

A) 1 / 250Ω

B) 1 / 200 Ω

C) 1 /100 Ω

D) 1 /10 Ω

Clear selection

36. Two electric lamps of 40 watt each are connected in parallel. The power consumed by the combination will be

1 point

A) 20 watt

B) 60 watt

C) 80 watt

D) 100 watt

Clear selection

37. The thermocouple is based on the principle of

1 point

A) Seebeck effect

B) Thomson effect

C) Peltier effect

D) Joule effect

Clear selection

38. A length L of wire carries a steady current I . It is bent first to form a circular plane coil of one turn. The same length is now bent more sharply to give a double loop of smaller radius. The magnetic field at the centre caused by the same current is

1 point

A) A quarter of its first value

B) Unaltered

C) Four times of its first value

D) A half of its first value

Clear selection

39. The radius of curvature of the path of the charged particle in a uniform magnetic field is directly proportional to

1 point

A) The charge on the particle

B) The momentum of the particle

C) The energy of the particle

D) The intensity of the field

Clear selection

40. Two free parallel wires carrying currents in opposite direction

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A) Attract each other

B) Repel each other

C) Neither attract nor repel

D) Get rotated to be perpendicular to each other

Clear selection

41. magnet of magnetic moment M and pole strength m is divided in two equal parts, then magnetic moment of each part will be A

1 point

A) M

B) M / 2

C) M / 4

D) 2M

Clear selection

42. At the magnetic north pole of the earth, the value of horizontal component of earth's magnetic field and angle of dip are, respectively

1 point

A) Zero, maximum

B) Maximum, minimum

C) Maximum, maximum

D) Minimum, minimum

Clear selection

43. The period of oscillation of a magnet in vibration magnetometer is 2sec. The period of oscillation of a magnet whose magnetic moment is four times that of the first magnet is

1 point

1 sec

B) 4 sec

C) 8 sec

D) 0.5 sec

Clear selection

44. A copper ring is held horizontally and a bar magnet is dropped through the ring with its length along the axis of the ring. The acceleration of the falling magnet while it is passing through the ring is

1 point

A) due to gravity

B) Less than that due to gravity

C) More than that due to gravity

D) Depends on the diameter of the ring and the length of the magnet

Clear selection

45. A long ends will horizontal metallic rod with length along the east-west direction is falling under gravity. The potential difference between its two

1 point

A) Be zero

B) Be constant

C) Increase with time

D) Decrease with time

Clear selection

46. The coefficient of self inductance of a solenoid is 0.18 mH. If a crode of soft iron of relative permeability 900 is inserted, then the coefficient of self inductance will become nearly

1 point

A) 5.4 mH

B) 162 mH

C) 0.006 mH

D) 0.0002 mH

Clear selection

47. In an ac circuit, peak value of voltage is 423 volts. Its effective voltage is

1 point

A) 400 volts

B) 323 volts

C) 300 volts

D) 340 volts

Clear selection

48. A choke coil is preferred to a rheostat in ac circuit as

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A) It consumes almost zero power

B) It increases current

C) It increases power

D) It increases voltage

Clear selection

49. For high frequency, a capacitor offers

1 point

A) More reactance

B) Less reactance

C) Zero reactance

D) Infinite reactance

Clear selection

50. Electron volt is a unit of

1 point

A) Potential

B) Charge

C) Power

D) Energy

Clear selection

51. The de-Broglie wavelength associated with the particle of mass m moving with velocity v is

1 point

A) h /mv

B) mv / h

C) mh /v

D) m / hv

Clear selection

52. When light falls on a metal surface, the maximum kinetic energy of the emitted photo-electrons depends upon

1 point

A) The time for which light falls on the metal

B) Frequency of the incident light

C) Intensity of the incident light

D) Velocity of the incident light

Clear selection

53. If in nature there may not be an element for which the principal quantum number n > 4, then the total possible number of elements will be

1 point

A) 0

B) 32

C) 4

D) 664

Clear selection

54. The particles which can be added to the nucleus of an atom without changing its chemical properties are called

1 point

A) Electrons

B) Protons

C) Neutrons

D) None of the above

Clear selection

55. Crystal structure of NaCl is

1 point

A) Fcc

B) Bcc

C) Both of the above

D) None of the above

Clear selection

56. The majority charge carriers in P-type semiconductor are

1 point

A) Electrons

B) Protons

C) Holes

D) Neutrons

Clear selection

57. The electrical circuit used to get smooth dc output from a rectifier circuit is called

1 point

A) Oscillator

B) Filter

C) Amplifier

D) Logic gates

Clear selection

58. The waves used in telecommunication are

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A) IR

B) UV

C) Microwave

D) Cosmic rays

Clear selection

59. The phenomenon by which light travels in an optical fibres is

1 point

A) Reflection

B) Refraction

C) Total internal reflection

D) Transmission

Clear selection

60. A laser beam is used for carrying out surgery because it

1 point

A) Is highly monochromatic

B) Is highly coherent

C) Is highly directional

D) Can be sharply focussed

Clear selection

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