Electricity and Magnetism TNPSC Group 1 Questions

Physics

Electricity and Magnetism MCQ Questions

13.
A 100 watt bulb will consume on unit of electrical energy in
A.
1 hour
B.
10 hour
C.
one day
D.
60 hours
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ANSWER :
B. 10 hour
14.

Consider the following statements:

An ordinary light bulb has a rather short life because the

1.) filament wire is not uniform

2.) bulb cannot be evacuated completely

3.) wires supporting the filament melt at high temperature

which of the above statements are correct?

A.

1 and 3

B.

2 and 3

C.

1 and 2

D.

1, 2 and 3

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ANSWER :

B. 2 and 3

15.

Consider the following statements:

Assertion (A ): Soft iron is used magnetic shielding

Reason(R ): Soft iron attracts a maximum number of magnetic items into it

A.

A,R both are wrong

B.

A,R both are right

C.

A is right,but R is wrong

D.

A is wrong , but R is right

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ANSWER :

B. A,R both are right

16.
The instrument which is used to measure the current flowing through a circuit is
A.
volt meter
B.
ammeter
C.
ohm meter
D.
magnetometer
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ANSWER :
B. ammeter
17.
In a AC Circuit containing capacitance only,
A.
current lags the emf by π/2
B.
current leads the emf by π/2
C.
current leads the emf by π
D.
current lags the emf by π
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ANSWER :
B. current leads the emf by π/2
18.
When a wave goes from one place to another it transports
A.
Matter
B.
Energy
C.
Mass
D.
nothing
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ANSWER :
B. Energy