Electricity: MCQ Test (25 questions)

Question 1 of 25

Faraday's constant-

Adepends on the amount of electrolyte
Bdepends on the electric current passed through the electrolyte
CDepends on the volume of the solvent in which the electrolyte is dissolved.
Dis a universal constant (e) None of the above More than one of the above

Question 2 of 25

A metallic wire having a resistance of 200 Ω is cut lengthwise into two equal parts and then these parts are connected in parallel. What is the resistance of this parallel combination equal to?

A1Ω
B10Ω
C5 ohms
D15Ω

Question 3 of 25

By what is alternating current converted into direct current?

AFilter
BRectifier
CMotor
DTransformers

Question 4 of 25

Which of the following is the unit of electric current?

AKelvin
Bmole
Ccandela
DAmpere

Question 5 of 25

Which of the following is not a semiconductor?

AGermanium
BSilicon
CSelenium
DArsenic

Question 6 of 25

The SI unit of specific resistance is-

AOm
Bohm-meter
Cohm/meter
Dohm/meter2

Question 7 of 25

If a 100 watt electric bulb burns for 10 hours, then the electricity cost at the rate of ₹5 per unit will be-

A₹ 5
B₹ 10
C₹ 25
D₹ 50

Question 8 of 25

The electrolyte used in a car battery is—

Ahydrochloric acid
Bsulfuric acid
Cnitric acid
Ddistilled water

Question 9 of 25

100 W electric bulb is used for 10 hours a day. How many units of energy will be used in 30 days?

A1
B10
C30
D300

Question 10 of 25

The commonly used safety fuse wire is made of-

Aalloy of tin and nickel
Bfrom an alloy of lead and iron
Calloy of nickel and lead
Dfrom an alloy of tin and lead

Question 11 of 25

How much is 1 volt equal to?

A1 joule
B1 joule/coulomb
C1 newton coulomb
D1 joule/newton

Question 12 of 25

The electricity consumption bill is based on the measurement of 1. Wattage 2. Voltage 3. Ohm 4. Ampere Choose the correct answer from the codes given below:

Aonly 1
B1 and 2
C2 and 3
D1 and 4

Question 13 of 25

'Dry cell' is-

Aprimary cell
BSecondary Cell
Ctertiary cell
Dquartile cell

Question 14 of 25

Who invented the lightning conductor?

AGraham Bell
BLord Lister
CBenjamin Franklin
DEinstein

Question 15 of 25

Dynamo is a machine whose function is-

Aconverting high voltage to low
Bconverting low voltage to high
Cconverting electrical energy into mechanical energy
Dconverting mechanical energy into electrical energy

Question 16 of 25

The electrical resistance of a conductor is independent of

Atemperature
Bpressure
Ccross-sectional area
Dlength

Question 17 of 25

Statement 'A' and reason 'R' are given below. Study and select the correct answer from the codes given below. Statement (A) Lightning conductors protect buildings from destruction. Reason (R) They transmit the electric charge to the earth.

ABoth A and R are correct and R is the correct reason for A
BBoth A and R are correct, but R is not the correct reason for A
CA is correct, but R is wrong.
DA is wrong, but R is correct

Question 18 of 25

Fluorescent tubes are preferred over electric bulbs because-

AIts illuminating surface is large
BIt is not affected by voltage fluctuations
CElectrical energy in the tube is almost completely converted into light energy
DIts light is not harmful to the eyes.

Question 19 of 25

Which of the following is the best conductor of electricity?

ACopper
BIron
Caluminum
DSilver

Question 20 of 25

Copper is mainly used for conducting electricity because-

AIt has a high melting point
BIt is cheap.
CIt is very durable
DIts electrical resistivity is low

Question 21 of 25

The device for converting electrical energy into mechanical energy is-

ADynamo
Btransformer
Celectric motor
DInductor

Question 22 of 25

"In the process of electrolysis, the amount of substance liberated at an electrode is directly proportional to the total charge flowing through it. This law is-

AFaraday's first law of electrolysis
BFaraday's second law of electrolysis
CFaraday's third law of electrolysis
Dnone of these

Question 23 of 25

What is the resistance of an ideal voltmeter?

AZero
BLower
CUnlimited
DHigh

Question 24 of 25

A fuse wire is used in an electric circuit to

ATo reduce the cost of electrical energy transmission
BTo keep the voltage level constant
CTo prevent excess current from flowing through a circuit
DTo prevent the electrical wire from overheating

Question 25 of 25

A fuse wire is used for

Atransmit high electric current without causing harm
Bbreak the electric circuit when excessive current flows
Cto protect a person from electric shock
Dnone of these