electric current and magnetism - Category wise Question and Answer Practice Test with Solutions

Question : 21

What should be the characteristic of fuse wire?

a) Low melting point, low specific resistance

b) High melting point, low specific resistance

c) High melting point, high specific resistance

d) Low melting point, high specific resistance

Question : 22

For a transistor amplifier, the voltage gain

a) is high at high and low frequencies and constant in the middle frequency range.

b) is low at high and low frequencies and constant at mid frequencies.

c) remains constant for all frequencies.

d) none of the above

Question : 23

Two magnets A and B are placed with like poles having one above another. What will happen?

a) A will move side ways

b) A will stuck to B

c) A will remain as in figure

d) Can't say

Question : 24

The filament of an electric bulb is of tungsten because

a) it is cheaper

b) its melting point is high

c) its resistance is negligible

d) filament is easily made

Question : 25

When current is passed through an electric bulb, its filament glows, but the wire leading current to the bulb does not glow because

a) the leading wire has more resistance than the filament

b) the leading wire has less resistance than the filament

c) less current flows in the leading wire as compared to that in the filament

d) filament has coating of fluorescent material over it