1. When a voltage of one volt is
applied, a circuit allows one micro ampere current to flow through it. The
conductance of the circuit is
(a)
1 n-mho
(b)
106 mho
(c)
1 milli-mho
(d)
none of the above
Ans:
a
2.
Which of the following can have negative temperature coefficient ?
(a)
Compounds of silver
(6)
Liquid metals
(c)
Metallic alloys
(d)
Electrolytes
3.
Conductance : mho ::
(a)
resistance : ohm
(b)
capacitance : henry
(c)
inductance : farad
(d)
lumen : steradian
Ans:
a
4.
1 angstrom is equal to
(a)
10-8 mm
(6)
10″6 cm
(c)
10″10 m
(d)
10~14 m
Ans:
c
5.
One newton meter is same as
(a)
one watt
(b)
one joule
(c)
five joules
(d)
one joule second
Ans:
b
6.
Two copper conductors have equal length. The cross-sectional area of one
conductor is four times that of the other. If the conductor having smaller
cross-sectional area has a resistance of 40 ohms the resistance of other
conductor will be
(a)
160 ohms
(b)
80 ohms
(c)
20 ohms
(d)
10 ohms
Ans:
d
7.
A nichrome wire used as a heater coil has the resistance of 2 £2/m. For a
heater of 1 kW at 200 V, the length of wire required will be
(a)
80 m
(b)
60 m
(c)
40 m
(d)
20 m
Ans:
a
8.
Temperature co-efficient of resistance is expressed in terms of
(a)
ohms/°C
(b)
mhos/ohm°C
(e)
ohms/ohm°C
(d)
mhos/°C
Ans:
c
9.
The insulation on a current carrying conductor is provided
(a)
to prevent leakage of current
(b)
to prevent shock
(c)
both of above factors
(d)
none of above factors
Ans:
c
10.
The thickness of insulation provided on the conductor depends on
(a)
the magnitude of voltage on the conductor
(b)
the magnitude of current flowing through it
(c)
both (a) and (b)
(d)
none of the above
Ans:
a
11.
Out of the following which is not a poor conductor ?
(a)
Cast iron
(b)
Copper
(c)
Carbon
(d)
Tungsten
Ans:
b
12.
Out of the following which is an insulating material ?
(a)
Copper
(b)
Gold
(c)
Silver
(d)
Paper
Ans:
d
13.
The property of a conductor due to which it passes current is called
(a)
resistance
(b)
reluctance
(c)
conductance
(d)
inductance
Ans:
c
14.
Conductance is reciprocal of
(a)
resistance
(b)
inductance
(c)
reluctance
(d)
capacitance
Ans:
a
15.
Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as
(a)
4 : 25
(b)
25 : 4
(c)
2 : 5
(d)
5 : 2
Ans:
c
16.
A glass rod when rubbed with silk cloth is charged because
(a)
it takes in proton
(b)
its atoms are removed
(c)
it gives away electrons
(d)
it gives away positive charge
Ans:
c
17.
It becomes more difficult to remove
(a)
any electron from the orbit
(6)
first electron from the orbit
(c)
second electron from the orbit
(d)
third electron from the orbit
Ans:
d
18.
The four bulbs of 40 W each are connected in series swift a battery across
them, which of the following statement is true ?
(a)
The current through each bulb in same
(b)
The voltage across each bulb is not same
(c)
The power dissipation in each bulb is not same
(d)
None of the above
Ans:
a
19.
Two resistances Rl and Ri are connected in series across the voltage source
where Rl>Ri. The largest drop will be across
(a)
Rl
(b)
Ri
(c)
either Rl or Ri
(d)
none of them
Ans:
a
20.
What will be energy used by the battery if the battery has to drive 6.28 x 1018
electrons with potential difference of 20 V across the terminal ?
(a)
5 joules
(b)
10 joules
(c)
15 joules
(d)
20 joules
Ans:
d
