DC Circuits - MCQTrip

The curve representing ohm's law is

cyclic

constant

linear

parabolic

With rise in temperature the resistance of pure metals

increases

first increases and then decreases

decreases

remains constant

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

80 V

132 V

33 V

66 v

A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is

6.4 A, 6.9 A

4.6 A, 9.6 A

6.4 A, 9.6 A

4.6 A, 6.9 A

The substances which have a large number of free electrons and offer a low resistance are called

inductors

insulators

conductors

semi-conductors

Specific resistance of a material is

Directly proportional to the area of cross section and inversely proportional to the length of material

Inversely proportional to the both area of cross section and length of material

Inversely proportional to the area of cross section and directly proportional to the length of material

Directly proportional to the both area of cross section and length of material

A DC circuit has ___________ as a load

Capacitance and Inductance

Resistance

Capacitance

Inductance

An instrument which detects electric current is known as

rheostat

wattmeter

voltmeter

galvanometer

The property of a conductor due to which it passes current is called

conductance

resistance

inductance

reluctance

With rise in temperature the resistance of semi-conductors

remains constant

first increases and then decreases

increases

decreases

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

1000

600

400

800

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

Porcelain

Manganin

Copper

Carbon

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.

1

3

2

4

According to Kirchoff’s voltage law,

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

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

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

Algebraic sum all the voltage drops in the circuit is zero

The S.I. unit of power is

coulomb

watt

Henry

watt-hour

One coulomb of charge is equal to the charge of

6.242 x 10 exp 18 electrons

6.025 x 10 exp–19 electrons

1.625 x 10 exp–31 electrons

1.095 x 10 exp–19 electrons

Two resistors are said to be connected in series when

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

total current equals the sum of branch currents

same current passes in turn through both

both carry the same value of current

The resistance of wire varies inversely as

area of cross section

temperature

resistivity

length

If a current of 5A flows through a resistor of 12 ohm then the power developed and the energy dissipated in 2 minutes are

380 W, 35000 J

360 W, 30000 J

300 W, 36000 J

380 W, 36000 J

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

three in parallel

two in parallel

two in parallel and one in series