electric current and magnetism - Category wise Question and Answer Practice Test with Solutions

Question : 26

In an intrinsic semiconductor

a) both holes and electrons carry current

b) both holes and electrons carry current with electrons being majority carriers

c) only electrons are responsible for flow of current

d) only holes are responsible for flow of current

Question : 27

Conductivity increases in the order of

a) Al, Cu, Ag

b) Cu, Al, Ag

c) Al, Ag, Cu

d) Ag, Cu, Al

Question : 28

Match the Column - I and Column - II.

a) A-Q; B-P; C-S; D-R

b) A-P; B-Q; C-S; D-R

c) A-P; B-Q; C-R; D-S

d) A-Q; B-P; C-R; D-S

Question : 29

The forbidden gap in the energy bands of germanium at room temperature is about

a) 0.1 eV

b) 0.67 eV

c) 1.1 eV

d) 6.7 eV

Question : 30 [IAS (Pre) 1999]

Consider the following statements regarding a motor car battery.

1. The voltage is usually 12V.
2. Electrolyte used is hydrochloric acid.
3. Electrodes are lead and copper.
4. Capacity is expressed in ampere-hour.

a) 3 and 4

b) 1 and 2

c) 2 and 3

d) 1 and 4