set 6 MCQ Questions & Answers Detailed Explanation

Question : 1

Reverse bias applied to a junction diode

a) lowers the potential barrier

b) raises the potential barrier

c) increases the minority carrier current

d) increases the majority carrier current

Question : 2

An electric lamp of 100 watt is used for 10 hours per day. The ‘units’ of energy consumed in one day by the lamp is

a) 10 units

b) 1 unit

c) 0.1 unit

d) 100 units

Question : 3

When a solid with a band gap has a donor level just below its empty energy band, the solid is

a) a conductor

b) p-type semiconductor

c) an insulator

d) n-type semiconductor

Question : 4

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 : 5

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 : 6

Electric flux at a point in an electric field is

a) negative

b) zero

c) positive

d) none of these