set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

Function of rectifier is

a) To convert D.C. into A.C.

b) To convert A.C. into D.C.

c) Both (a) and (b)

d) None of these

Question : 2

The permanent magnet is made from which one of the following substances?

a) Ferromagnetic

b) Diamagnetic

c) Paramagnetic

d) Electromagnetic

Question : 3

Which impurity is doped in Si to form n-type semiconductors?

a) B

b) As

c) Al

d) None of these

Question : 4

Electroplating does not help in

a) shining appearance

b) metals to become hard

c) fine finish to the surface

d) protect metals against corrosion

Question : 5

The distance between two magnetic poles is doubled and their pole-strength is also doubled. The force between them

a) remains unchanged

b) increases to four times

c) decreases by half

d) increases to two times

Question : 6

Alternating current cannot be measured by D.C. ammeter because

a) A.C. changes direction

b) A.C. cannot pass through D.C. ammeter

c) average value of current for complete cycle is zero

d) D.C. ammeter will get damaged