11) Ampere-second is the unit of
a) power
b) energy
c) e.m.f.
d) charge
12) The filament of an electric bulb is made of
a) tungsten
b) nickel
c) steel
d) aliminium
13) The percentage by which the incandescence of lamp decreases due to drop of current by 3% is
a) 6%
b) 3%
c) 9%
d) 12%
14) In which of the following substances the resistance decreases with increase in tempareture?
a) carbon
b) constantan
c) copper
d) silver
15) Eureka has ………. Temperature co-efficient of resistance.
a) almost zero
b) negative
c) positive
d) nne of the above
16) At 0 K, germanium behaves as
a) a conductor
b) an insulator
c) a superconductor
d) a ferromagnetic substance
17) The mass of a proton is ……….. the mass of electron.
a) equal to
b) less than
c) about 1837 times
d) 200 times
18) E.M.F. in a circuit
a) increases circuit resistance
b) decreases circuit resistance
c) maintains potential difference
d) none of the above
19) A copper wire stretched so that its length is increased by 0.1%. The change in its resistance is
a) 0.3%
b) 0.4%
c) 0.2%
d) none of the above
20) In case of liquids,Ohm’s law is
a) fully obeyed
b) partially obeyed
c) there is no relation between current and p.d.
d) none of the above
Best Wishes for the All Candidates!