set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

At absolute zero, Si acts as

a) metal

b) insulator

c) non-metal

d) None of these

Question : 2

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

a) ferromagnetics

b) diamagnetics

c) paramagnetics

d) antimagnetics

Question : 3

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 : 4

Curie temperature is the temperature above which

a) a ferromagnetic material becomes diamagnetic

b) a ferromagnetic material becomes paramagenetic

c) a paramagnetic material becomes diamagnetic

d) a paramagnetic m aterial becomes ferromagnetic

Question : 5

How does the white light produce in the tube?

a) To accelerate the atoms

b) To heat up the copper wire

c) To heat up the filament

d) To oscillate molecule

Question : 6

The mobility of conduction electrons is greater than that of holes, since electrons

a) are negatively charged

b) require smaller energy for moving through crystal lattice

c) are lighter

d) undergo smaller number of collisions