Practice Current Electricity Multiple Choice Questions Quiz-1 - MCQGeeks.com

Q.1

Out of the following which is an insulating material?

Copper
Gold
Silver
Paper

Q.2

It becomes more difficult to remove

Any electron from the orbit
First electron from the orbit
Second electron from the orbit
Third electron from the orbit

Q.3

An open resistor, when checked with an ohmmeter reads

Zero
Infinite
High but within tolerance
Low but not zero

Q.4

Sparking occurs when a load is switched off because the circuit has high

Resistance
Inductance
Capacitance
Impedance

Q.5

Electric current passing through the circuit produces

Magnetic effect
Luminous effect
Thermal effect
Chemical effect

Q.6

In the case of direct current

Magnitude and direction of current remains constant
Magnitude and direction of current changes with time
Magnitude of current changes with time
Magnitude of current remains constant

Q.7

In a lamp load when more than one lamp are switched on the total resistance of the load

Increases
Decreases
Remains same
None of the above

Q.8

One Newton meter is same as

One watt
One joule
Five joules
One joule second

Q.9

The filament of an electric bulb is made of

Carbon
Aluminium
Tungsten
Nickel

Q.10

A 3 Q resistor having 2 A current will dissipate the power of

2 watts
4 watts
6 watts
8 watts

Q.11

Electric pressure is also called

Resistance
Power
Voltage
Energy

Q.12

Whether circuit may be AC. or D.C. one, following is most effective in reducing the magnitude of the current.

Reactor
Capacitor
Inductor
Resistor

Q.13

Varistors are

Insulators
Nonlinear resistors
Carbon resistors
Resistors with zero temperature coefficients

Q.14

The hot resistance of the bulb's filament is higher than its cold resistance because the temperature coefficient of the filament is

Zero
Negative
Positive
About 2 ohms per degree

Q.15

Voltage dependent resistors are used

For inductive circuits
To suppress surges
As heating elements
As current stabilizers

Q.16

Voltage dependent resistors are usually made from

Charcoal
Silicon carbide
Nichrome
Graphite

Q.17

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?

18 Q
36 Q
48 Q
64 Q

Q.18

Temperature coefficient of resistance is expressed in terms of

ohms/°C
mhos/ohm°C
ohms/ohm°C
mhos/°C

Q.19

With rise in temperature the resistance of pure metals

Increases
Decreases
First increases and then decreases
Remains constant

Q.20

Which of the following statement is correct?

A semiconductor is a material whose conductivity is same as between that of a conductor and an insulator
A semiconductor is a material which has conductivity having average value of conductivity of metal and insulator
A semiconductor is one which conducts only half of the applied voltage
A semiconductor is a material made of alternate layers of conducting material and insulator

Q.21

The resistance of a copper wire 200 m long is 21 ω. If its thickness (diameter) is 0.44 mm, its specific resistance is around

1.2 x 10^-8 ω-m
1.4 x 10^-8 ω-m
1.6 x 10^-8 ω-m
1.8 x 10^-8 ω-m

Q.22

The weight of an aluminium conductor as compared to a copper conductor of identical cross-section, for the same electrical resistance, is

50 %
60 %
100 %
150 %

Q.23

Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct?

100 W lamp will glow brighter
40 W lamp will glow brighter
Both lamps will glow equally bright
40 W lamp will fuse

Q.24

With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals

10 W
20 W
40 W
60 W

Q.25

The insulation on a current carrying conductor is provided

To prevent leakage of current
To prevent shock
Both of above factors
None of above factors

Q.26

Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be

9 times
1/9 times
1/3 times
3 times

Q.27

When current flows through heater coil it glows but supply wiring does not glow because

Current through supply line flows at slower speed
Supply wiring is covered with insulation layer
Resistance of heater coil is more than the supply wires
Supply wires are made of superior material

Q.28

Which method can be used for absolute measurement of resistances?

Lorentz method
Raleigh method
Ohm's law method
Wheatstone bridge method

Q.29

A field of force can exist only between

Two molecules
Two ions
Two atoms
Two metal particles

Q.30

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

33 V
66 V
80 V
132 V

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