Electricity and Magnetism TNPSC Group 4 VAO Questions

Electricity and Magnetism MCQ Questions

1.
The unit of electrical conductivity is
A.
mho
B.
ohm
C.
faraday
D.
coulomb
ANSWER :
A. mho
2.

Two resistances 18 Ω and 6 Ω are connected to a 6 V battery in series.

Calculate

(a) the total resistance of the circuit,

(b) the current through the circuit

A.

24 Ω and 0.25 A

B.

10 Ω and 0.20 A

C.

12 Ω and 1.30 A

D.

30 Ω and 0.25 A

ANSWER :

A. 24 Ω and 0.25 A

3.
Three resistances having the values 5 Ω, 10 Ω, 30 Ω are connected parallel to each other. Calculate the equivalent resistance.
A.
3 Ω
B.
C.
D.
6 Ω
ANSWER :
A. 3 Ω
4.
One unit of electrical energy consumption is equal to
A.
1000 watt per hour
B.
500 watt per hour
C.
100 watt per hour
D.
None of these
ANSWER :
A. 1000 watt per hour
5.

Consider the following statements:

Assertion (A) : In an electric bulb,the filament is in the form of a coiled coil

Reason (R ): A coiled coil filament occupies less space and id therefore,not cooled significantly by the convection current in the bulb.

A.

Both A and R are true, but R is the correct explanation of A

B.

Both A and R are true, but R is not the correct explanation of A

C.

A is true, but R is false

D.

A is false but R is true

ANSWER :

A. Both A and R are true, but R is the correct explanation of A

6.

Consider the following statements:

Assertion (A) : Electric power is transmitted over long distances through conducting wires of very high voltages

Reason (R ): Then only the power can be supplied to the individual houses

A.

Both A and R are true, but R is not the correct explanation of A

B.

Both A and R are true and R is the correct explanation of A

C.

Both A and R are false

D.

A is false but R is true

ANSWER :

A. Both A and R are true, but R is not the correct explanation of A