general science

Physics MCQ Questions and Answers Page - 9

1.

Electric current in a metal wire is due to the flow of –

Answer/ Hint      

Answer : A

Explanation :

2.

Which of the following events occurred first  ?

Answer/ Hint      

Answer : B

Explanation :

3.

Tape recorder should  NOT  be kept near one of the following things  :

Answer/ Hint      

Answer : B

Explanation :

4.

Which of the following is a good conductor of heat but a bad conductor of electricity  ?

Answer/ Hint      

Answer : D

Explanation :

5.

A photostat machine works on

Answer/ Hint      

Answer : B

Explanation :

6.

Lightning is caused due to

Answer/ Hint      

Answer : B

Explanation :

7.

The device which transfer the signal from low resistance region to high resistance region is

Answer/ Hint      

Answer : B

Explanation :

8.

A bird sitting on a high tension electric wire does not get electrocuted because

Answer/ Hint      

Answer : C

Explanation :

9.

Which of the following is arranged in order of decreasing conductivity  ?

Answer/ Hint      

Answer : D

Explanation :

10.

If a copper wire is increased to double its length, its resistance will become

Answer/ Hint      

Answer : C

Explanation :

11.

The resistance of the human body (dry condition) is of the order of

Answer/ Hint      

Answer : D

Explanation :

12.

A device which is used to limit the current in an electrical circuit is called a

Answer/ Hint      

Answer : B

Explanation :

13.

The earth wire of a cable is connected to

Answer/ Hint      

Answer : B

Explanation :

14.

Negative feedback in amplifiers

Answer/ Hint      

Answer : A

Explanation :

15.

The metal whose electrical conductivity is more, is

Answer/ Hint      

Answer : C

Explanation :

16.

Conversion of heat into electrical energy is achieved by using  :

Answer/ Hint      

Answer : D

Explanation :

17.

Moving electric charge produces  :

Answer/ Hint      

Answer : A

Explanation :

18.

The  S.I.  unit of electric charge is  :

Answer/ Hint      

Answer : B

Explanation :

19.

The best material for the core of a transformer is

Answer/ Hint      

Answer : D

Explanation :

20.

In AC circuits, AC meters measure

Answer/ Hint      

Answer : B

Explanation :

21.

The width of depletion layer of a P-N junction

Answer/ Hint      

Answer : D

Explanation :

22.

Safety fuse wire used in domestic electrical appliances is made of metal of low

Answer/ Hint      

Answer : B

Explanation :

23.

Which of the following is a conductor of electricity  ?

Answer/ Hint      

Answer : C

Explanation :

24.

A fuse wire is made of  :

Answer/ Hint      

Answer : B

Explanation :

25.

For which of the following substances, the resistance decreases with increase in temperature  ?

Answer/ Hint      

Answer : A

Explanation :

26.

Full form of  CFL  used in place of electric bulbs is

Answer/ Hint      

Answer : A

Explanation :

27.

Indicate the false statement about the resistance of a wire.

Answer/ Hint      

Answer : C

Explanation :

28.

A wire carrying current is

Answer/ Hint      

Answer : C

Explanation :

29.

The method of magnetisation is  :

Answer/ Hint      

Answer : C

Explanation :

30.

Magnetic keepers are pieces of

Answer/ Hint      

Answer : D

Explanation :

31.

Certain substances loose their electrical resistance completely at super low temperature. Such substances are called.

Answer/ Hint      

Answer : A

Explanation :

32.

‘Farad’  is the unit of  :

Answer/ Hint      

Answer : A

Explanation :

33.

Solids which conduct electricity at higher temperature but not at lower temperature are called

Answer/ Hint      

Answer : C

Explanation :

34.

Light scattering takes place in

Answer/ Hint      

Answer : A

Explanation :

35.

A good conductor while carrying current is

Answer/ Hint      

Answer : B

Explanation :

36.

In a filament type light bulb most of the electric power consumed appears as

Answer/ Hint      

Answer : B

Explanation :

37.

When two semiconductors of p and n-type are brought in contact, they form p-n junction which acts like a/an

Answer/ Hint      

Answer : C

Explanation :

38.

Ohm’s law is valid in case of

Answer/ Hint      

Answer : B

Explanation :

39.

The Laser is a beam of radiations which are

Answer/ Hint      

Answer : B

Explanation :

40.

Magnetic keepers are used to protect magnets from  :

Answer/ Hint      

Answer : C

Explanation :

41.

A current carrying conductor is associated with

Answer/ Hint      

Answer : C

Explanation :

42.

Tesla is a unit of magnetic :

Answer/ Hint      

Answer : D

Explanation :

43.

Super conductors are substances that

Answer/ Hint      

Answer : A

Explanation :

44.

In a conductor

Answer/ Hint      

Answer : D

Explanation :

45.

In which one of the following the phenomenon of total internal reflection of light is used  ?

Answer/ Hint      

Answer : C

Explanation :

46.

A wire of resistance  R  is cut into  ‘n’  equal parts. These parts are then connected in parallel. The equivalent resistance of the combination will be

Answer/ Hint      

Answer : D

Explanation :

47.

Which of these waves can be polarized  ?

Answer/ Hint      

Answer : D

Explanation :

48.

If a wire of resistance  R  is melted and recasted to half of its length, then the new resistance of the wire will be

Answer/ Hint      

Answer : A

Explanation :

49.

The purpose of choke in a fluorescent lamp is  :

Answer/ Hint      

Answer : B

Explanation :

50.

When number of turns in a coil is tripled, without any change in the length of coil, its self-inductance becomes  ?

Answer/ Hint      

Answer : A

Explanation :

51.

Unit of resistance is  :

Answer : B

Explanation :

52.

S.I.  unit of Magnetic flux is

Answer/ Hint      

Answer : A

Explanation :

53.

To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor

Answer/ Hint      

Answer : D

Explanation :

54.

The magnitude of current flowing between two end points of a conductor is proportional to the potential difference between them and is called as  :

Answer/ Hint      

Answer : C

Explanation :

55.

Which of the following was the first theory of super conductivity  ?

Answer/ Hint      

Answer : B

Explanation :

56.

Which of the following is an insulator  ?

Answer/ Hint      

Answer : D

Explanation :

57.

Name the process by which bubbles from liquid are formed  ?

Answer/ Hint      

Answer : A

Explanation :

58.

What is the name of the device used to convert alternating current into direct current  ?

Answer/ Hint      

Answer : C

Explanation :

59.

The  ‘Choke’  used with a tube light is basically

Answer/ Hint      

Answer : A

Explanation :

60.

Which one among the following components is used as an amplifying device  ?

Answer/ Hint      

Answer : D

Explanation :

61.

A galvanometer can be converted into a voltmeter by connecting with it a

Answer/ Hint      

Answer : C

Explanation :

62.

At low temperature, Lead behaves as a  :

Answer/ Hint      

Answer : B

Explanation :

63.

If electric resistance is to be decreased, then the number of resistances should be connected in  _______________

Answer/ Hint      

Answer : B

Explanation :

64.

The material used in electric heater is

Answer/ Hint      

Answer : B

Explanation :

65.

Which one of the following is an ohmic conductor  ?

Answer/ Hint      

Answer : D

Explanation :

66.

The frequency of direct current is  ______________

Answer/ Hint      

Answer : A

Explanation :

67.

For photoelectric effect to take place, the metal used as the cathode should have  ______________

Answer/ Hint      

Answer : C

Explanation :

68.

Flemings  “Left hand Rule”  is associated with the effect of

Answer/ Hint      

Answer : D

Explanation :

69.

Where is a transistor most likely to be found  ?

Answer/ Hint      

Answer : C

Explanation :

70.

Which one of the following is a good electrical conductor  ?

Answer/ Hint      

Answer : A

Explanation :

71.

Which one among the following components can not be developed within  an  “integrated circuit”   ?

Answer/ Hint      

Answer : C

Explanation :

72.

Electromagnet is constructed with which of the following  ?

Answer/ Hint      

Answer : B

Explanation :

73.

The fuse in an electric circuit is connected in

Answer/ Hint      

Answer : D

Explanation :

74.

___________   through a plane surface is the product of the magnetic flux density normal to the surface and the area of the surface.

Answer/ Hint      

Answer : C

Explanation :

75.

____________   states that the total current entering a junction is equal to the current leaving the junction.

Answer/ Hint      

Answer : D

Explanation :

76.

Which material is used in the manufacturing of electric heater coil  ?

Answer/ Hint      

Answer : D

Explanation :

77.

The coil wire in the electric room heater or electric cooking heater is called  _____________ .

Answer/ Hint      

Answer : B

Explanation :

78.

A common fluorescent tube contains  _____________ .

Answer/ Hint      

Answer : B

Explanation :

79.

Kilowatt hour (kWh) represents the unit of which of the following  ?

Answer/ Hint      

Answer : D

Explanation :

80.

Rectifiers are used to convert

Answer/ Hint      

Answer : D

Explanation :

81.

The metal cap of an electric cell is generally the  _____________  terminal of the electric cell.

Answer/ Hint      

Answer : B

Explanation :

82.

When two or more cells are connected to each other by opposite terminals, then it is called as  _____________ .

Answer/ Hint      

Answer : C

Explanation :

83.

A positively charged particle projected towards west is deflected towards north by a magnetic field. What is the direction of magnetic field  ?

Answer/ Hint      

Answer : D

Explanation :

84.

Which of the following affects the resistance of the wire  ?

Answer/ Hint      

Answer : D

Explanation :

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