set 6 MCQ Questions & Answers Detailed Explanation

Question : 1

Electric flux at a point in an electric field is

a) negative

b) zero

c) positive

d) none of these

Question : 2

Which one of the following is the correct angle between the incident and reflected rays when a ray of light incident normally on a plane mirror?

a) 45°

b) 180°

c) 90°

d) 0°

Question : 3

A conducting wire can give magnetic poles when it

a) suspended freely in air

b) bent into the form of a circular ring

c) placed in an external magnetic field

d) All of the above

Question : 4

The primary cell which is used in daily life is

a) Dry cell

b) Daniel cell

c) Leclanche cell

d) Simple voltaic cell

Question : 5

When a body is charged by induction, then the body

a) does not lose any charge

b) loses whole of the charge on it

c) becomes neutral

d) loses part of the charge on it

Question : 6

In extrinsic semiconductors

a) the gap between conduction band and valence band is more than 16 eV

b) the gap between conduction band and valence band is near about 1 eV

c) the conduction band and valence band overlap

d) the gap between conduction band and valence band will be 100 eV and more