1.
2.
The resistance of human body is around

A

5 ohms

B

25 ohms

C

250 ohms

D

1000 ohms

Answer/ Hint

3.
The draft velocity of the electron is

A

Very small as compared to speed of light

B

Equal to speed of light

C

Almost equal to speed of light

D

Greater than speed of light

Answer/ Hint

4.
5.
The electrical energy required to heat a bucket of water to a certain temperature is 4 kWh. If the heat losses are 20 percent, the energy input is

A

2 kWh

B

3.2 kWh

C

5 kWh

D

6 kWh

Answer/ Hint

6.
In gases the flow of current is due to

A

Electrons only

B

Positive ions only

C

Electrons and positive ions

D

Electrons, positive ions, negative ions

Answer/ Hint

7.
The maximum current rating for a 10KΩ, 0.5 W resistor is

A

0.77 mA

B

14.14 mA

C

7.07 mA

D

28.28 mA

Answer/ Hint

8.
An electrical lamp consumes 100 W of power. If the supply voltage is 220 V the energy consumed in 30 minutes is

A

0.005 kWh

B

0.05 kWh

C

0.5 kWh

D

5 kWh

Answer/ Hint

9.
The S.I. unit of power is

A

Henry

B

Coulomb

C

Watt

D

Watt-hour

Answer/ Hint

10.
Electric pressure is also called

A

Resistance

B

Power

C

Voltage

D

Energy

Answer/ Hint

11.
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

Answer/ Hint

12.
Out of the following which is not a poor conductor?

A

Cast iron

B

Copper

C

Carbon

D

Tungsten

Answer/ Hint

13.
Out of the following which is an insulating material?

A

Copper

B

Gold

C

Silver

D

Paper

Answer/ Hint

14.
15.
Conductance is reciprocal of

A

Resistance

B

Inductance

C

Reluctance

D

Capacitance

Answer/ Hint

16.
The resistance of a conductor caries inversely as

A

Length

B

Area of cross-section

C

Temperature

D

Resistivity

Answer/ Hint

17.
With rise in temperature the resistance of pure metals

A

Increases

B

Decrease

C

First increases and then decreases

D

Remains constant

Answer/ Hint

18.
With in temperature the resistance of semi-conductors

A

Decreases

B

Increases

C

First increases and then decreases

D

Remain constant

Answer/ Hint

19.
Three resistances of 10 ohms, 15 ohms and 30 ohms are connected in parallel. The total resistance of the combination is

A

5 ohms

B

10 ohms

C

15 ohms

D

55 ohms

Answer/ Hint

20.
The resistance of two wires is 25 Ω when connected in series and 6 Ω when joined in parallel. The resistance of each wire is

A

10 Ω, 15 Ω

B

20 Ω, 30 Ω

C

5 Ω, 10 Ω

D

10 Ω, 20 Ω

Answer/ Hint

21.
22.
In a circuit a 33 Ω 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

Answer/ Hint

23.
A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is

A

400 Ω

B

600 Ω

C

800 Ω

D

1000 Ω

Answer/ Hint

24.
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 Ω

B

36 Ω

C

48 Ω

D

64 Ω

Answer/ Hint

25.
Current velocity through a copper conductor is

A

The same as propagation velocity of electrical energy

B

Independent of current strength

C

Of the order of a few µs/m

D

Nearly 3 x 10 ^{8} m/s

Answer/ Hint

26.
Which of the following material has nearly zero temperature co-efficient of resistance?

A

Manganin

B

Porcelain

C

Carbon

D

Copper

Answer/ Hint

27.
You have to replace 1500 Ω resistor in radio. You have no 1500 Ω resistor but have several 1000 Ω ones which you would connect

A

Two in parallel

B

Two in parallel and one in series

C

Three in parallel

D

Three in series

Answer/ Hint

28.
Two resistor are said to be connected in series when

A

Same current passes in turn through both

B

Both carry the same value of current

C

Total current equals to the sum of branch current

D

Sum of IR drops equals to the applied e.m.f

Answer/ Hint

29.
Which of the following statement is true both for a series and a parallel DC circuit?

A

Elements have individual currents

B

Currents are additive

C

Voltages are additive

D

Power are additive

Answer/ Hint

30.
OHM’S law is not applicable to

A

Vacuum tubes

B

Carbon resistors

C

High voltage circuits

D

Circuits with low current densities

Answer/ Hint

31.
Which is the best conductor of electricity?

A

Iron

B

Silver

C

Copper

D

Carbon

Answer/ Hint

32.
Which of the following can be have negative temperature coefficient?

A

Compounds of silver

B

Liquid metals

C

Metallic alloys

D

Electrolytes

Answer/ Hint

33.
Conductance: mho ::

A

Resistance : ohm

B

Capacitance : henry

C

Inductance : farad

D

Lumen : steradian

Answer/ Hint

34.
1 angstrom is equal to

A

10^{-8} mm

B

10^{-6} cm

C

10^{-10} m

D

10^{-14} m

Answer/ Hint

35.
One newton meter is same as

A

One watt

B

One joule

C

Five joules

D

One joule second

Answer/ Hint