set 6 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

Magnets attract magnetic substances are iron, nickel, cobalt, etc. They can also repel

a) diamagnetic substances

b) paramagnetic substances

c) ferromagnetic substances

d) non-magnetic substances

Question : 3

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 : 4

Electric flux at a point in an electric field is

a) negative

b) zero

c) positive

d) none of these

Question : 5

A spherical air bubble is embedded in a piece of glass. For a ray of light passing through the bubble, it behaves like a

a) plano-converging lens

b) converging lens

c) diverging lens

d) plano-diverging len

Question : 6

The primary cell which is used in daily life is

a) Dry cell

b) Daniel cell

c) Leclanche cell

d) Simple voltaic cell