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

Question : 6 [IAS Prelim]

Consider the following statements regarding a motor car battery:

1. The voltage is usually 12 V.
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

Question : 7 [UPPCS (Pre) 2008]

Electric motors operating at low voltages tend to burn out because

a) They draw heat proportional to $v^2$

b) They draw more current which is inversely proportional to the voltage

c) They draw more current which is inversely proportional to the square root of the voltage

d) Low voltage sets in electrical discharge

Question : 8 [IAS (Pre) 1996]

Domestic electrical wiring is basically a

a) Combination of series and parallel connections

b) Series connection

c) Parallel connection

d) Series connection within each room and parallel connective elsewhere

Question : 9

To obtain a p-type germanium semiconductor, it must be doped with

a) antimony

b) indium

c) arsenic

d) phosphorus

Question : 10

The Donor level in a semiconductor is placed

a) in the forbidden energy gap close to the upper edge of the valence band

b) in the conduction band close to the lower edge to the conduction band

c) half-way in the forbidden energy gap

d) in the forbidden energy gap close to the lower edge of the conduction band