1. The S.I. unit of
power is
(a) Henry
(b) coulomb
(c) watt
(d) watt-hour
Ans: c
2. Electric
pressure is also called
(a) resistance
(b) power
(c) voltage
(d) energy
3. The rating of a
fuse wire is always expressed in
(a) ampere-hours
(b) ampere-volts
(c) kWh
(d) amperes
Ans: d
4. The minimum
charge on an ion is
(a) equal to the
atomic number of the atom
(b) equal to the
charge of an electron
(c) equal to the
charge of the number of electrons in an atom (#) zero
Ans: b
5. In a series
circuit with unequal resistances
(a) the highest
resistance has the most of the current through it
(b) the lowest
resistance has the highest voltage drop
(c) the lowest
resistance has the highest current
(d) the highest
resistance has the highest voltage drop
Ans: d
6. The filament of
an electric bulb is made of
(a) carbon
(b) aluminium
(c) tungsten
(d) nickel
Ans: c
7. A 3 Q resistor
having 2 A current will dissipate the power of
(a) 2 watts
(b) 4 watts
(c) 6 watts
(d) 8 watts
Ans: c
8. Which of the
following statement is true?
(a) A galvanometer
with low resistance in parallel is a voltmeter
(b) A galvanometer
with high resistance in parallel is a voltmeter
(c) A galvanometer
with low resistance in series is an ammeter
(d) A galvanometer
with high resistance in series is an ammeter
Ans: c
9. The resistance
of a few meters of wire conductor in closed electrical circuit is
(a) practically
zero
(b) low
(c) high
(d) very high
Ans: a
10. If a parallel
circuit is opened in the main line, the current
(a) increases in
the branch of the lowest resistance
(b) increases in
each branch
(c) is zero in all
branches
(d) is zero in the
highest resistive branch
Ans: c
11. If a wire
conductor of 0.2 ohm resistance is doubled in length, its resistance becomes
(a) 0.4 ohm
(b) 0.6 ohm
(c) 0.8 ohm
(d) 1.0 ohm
Ans: a
12. Three 60 W
bulbs are in parallel across the 60 V power line. If one bulb burns open
(a) there will be
heavy current in the main line
(b) rest of the two
bulbs will not light
(c) all three bulbs
will light
(d) the other two
bulbs will light
Ans: d
13. The substances
which have a large number of free electrons and offer a low resistance are
called
(a) insulators
(b) inductors
(c) semi-conductors
(d) conductors
Ans: d
14. In a circuit a
33 Q resistor carries a current of 2 A. The voltage across the resistor is
(a) 33 V
(b) 66 v
(c) 80 V
(d) 132 V
Ans: b
15. A light bulb
draws 300 mA when the voltage across it is 240 V. The resistance of the light
bulb is
(a) 400 Q
(b) 600 Q
(c) 800 Q
(d) 1000 Q
Ans: c
16. The resistance
of a parallel circuit consisting of two branches is 12 ohms. If the resistance
of one branch is 18 ohms, what is the resistance of the other ?
(a) 18 Q
(b) 36 Q
(c) 48 Q
(d) 64 Q
Ans: b
17. Electric
current passing through the circuit produces
(a) magnetic effect
(b) luminous effect
(c) thermal effect
(d) chemical effect
(e) all above
effects
Ans: c
18. Resistance of a
material always decreases if
(a) temperature of
material is decreased
(6) temperature of
material is increased
(c) number of free
electrons available become more
(d) none of the
above is correct
Ans: c
19. If the
efficiency of a machine is to be high, what should be low ?
(a) Input power
(b) Losses
(c) True component
of power
(d) kWh consumed
(e) Ratio of output
to input
Ans: b
20. When electric
current passes through a metallic conductor, its temperature rises. This is due
to
(a) collisions
between conduction electrons and atoms
(b) the release of
conduction electrons from parent atoms
(c) mutual
collisions between metal atoms
(d) mutual
collisions between conducting electrons
Ans: a
