set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

Which of the statements is true for p-type semiconductos?

a) Electrons are minority carriers and pentavalent atoms are the dopants.

b) Holes are minority carriers and pentavalent atoms are the dopants.

c) Electrons are majority carriers and trivalent atoms are the dopants.

d) Holes are majority carriers and trivalent atoms are the dopants.

Question : 2

When a ferromagnetic material is heated to temperature above its Curie temperature, the material:

a) behaves like a diamagnetic material

b) is permanently magnetized

c) remains ferromagnetic

d) behaves like a paramagnetic material

Question : 3

Match list-I with list -II:

a) A – 4 ; B – 3 ; C – 2 ; D – 1

b) A – 3 ; B – 1 ; C – 2 ; D – 4

c) A – 4 ; B – 2 ; C – 3 ; D – 1

d) A – 3 ; B – 4 ; C – 1 ; D – 2

Question : 4

Two pieces of metallic wire having equal lengths and equal volume placed in air have different resistances. The two wires must

a) be of different materials

b) have different cross-sections

c) have different temperatures

d) be of same density

Question : 5

Small drops of the same size are charged to V volts each. If n such drops coalesce to form a single large drop, its potential will be

a) nV

b) $n^{2/3}$V

c) $n^{1/3}$V

d) $n^{–1}$V

Question : 6

Five bulbs each of 100 watt capacity in a tunnel are illuminated continuously for twenty hours. The consumption of electricity will be

a) Ten units

b) One unit

c) Two units

d) Twenty units