set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

If potential difference and current flowing through a wire is increased twice each, then electric power

a) Will increase two times

b) Will remain unaffected

c) Will increase four times

d) Will decrease half

Question : 3

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 : 4

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

Question : 5

Metals getting magnetised by orientation of atomic magnetic moments in external magnetic field are called

a) ferromagnetics

b) diamagnetics

c) paramagnetics

d) antimagnetics

Question : 6

At absolute zero, Si acts as

a) metal

b) insulator

c) non-metal

d) None of these