Welcome to your DC Circuits MCQ practice assessment.

Electrical appliances are not connected in series because

Appliances have different current ratings

Resistances are different

Series circuit is complicated

Power loss is more

None

Which of the following materials has a negative temperature coefficient of resistance?

Brass

Aluminum

Carbon

Copper

None

A resistance having rating 10 ohms, 10 W is likely to be a

wire wound resistor

metallic resistor

carbon resistor

variable resistor

None

Which of the following material has nearly zero temperature coefficient of resistance

Porcelain

Manganin

Copper

Carbon

None

The resistance of wire varies inversely as

temperature

area of cross section

length

resistivity

None

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

5 ohms

15 ohms

55 ohms

10 ohms

None

In a circuit a 33 ohms resistor carries a current of 2 A. The voltage across the resistor is

33 V

132 V

80 V

66 v

None

Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 0.25 Q. If the same four wires are connected is series the effective resistance will be ___ ohms.

2

1

4

3

None

With rise in temperature the resistance of semi-conductors

first increases and then decreases

decreases

remains constant

increases

None

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

three in series

two in parallel

three in parallel

two in parallel and one in series

None

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

1000

800

600

400

None

Two resistors are said to be connected in series when

total current equals the sum of branch currents

both carry the same value of current

same current passes in turn through both

sum of IR drops equals the applied e.m.f.

None

An instrument which detects electric current is known as

galvanometer

wattmeter

rheostat

voltmeter

None

According to Kirchoff’s voltage law,

The algebraic sum of all the e.m.f’s in the circuit is zero

Algebraic sum all the voltage drops in the circuit is zero

The algebraic sum of all the e.m.f’s in the circuit is infinity

Algebraic sum of e.m.f’s plus algebraic sum of voltage drops is equal to zero

None

If a number of resistors are connected in parallel, then the reciprocal of total resistance is equal to

Reciprocal of the sum of individual resistances

Product of individual resistances

Sum of individual resistances

Sum of the reciprocal of individual resistances

None

The purpose of load in an electric circuit is to

Increase electrical energy

Increase the circuit current

Decrease the circuit current

Utilize electrical energy

None

The curve representing ohm's law is

parabolic

constant

linear

cyclic

None

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 ?