Electricity: MCQ Test (50 questions)

Question 1 of 50

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 2 of 50

Fans, bulbs etc. installed in houses are fitted with-

Ain order of rank
Bin mixed order
Cin parallel order
Din any order

Question 3 of 50

The filament of an electric bulb glows when current flows through it, but the wires carrying current to the filament do not glow. This is because:

AMore current flows through the filament than through the wire
BThe resistance of the filament is less than that of the wire
CThe resistance of the filament is higher than that of the wire
DOnly tungsten metal glows when electric current is passed through it.

Question 4 of 50

When two or more resistances are connected in series with each other, they are connected in _______.

Ain order of rank
Bin parallel order
Cstraight
Din line

Question 5 of 50

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 6 of 50

If the radius of a wire is halved, its resistance-

Awill be half
Bwill double
COne fourth will remain
Dwill be sixteen times

Question 7 of 50

The device used to change the speed of an electric fan is-

Aamplifier
Bregulator
CSwitch
DRectifier

Question 8 of 50

An electrical fuse wire must have which of the following property sets for general applications?

AThick wire, high melting point alloy, short length
BThick wire, low melting point alloy, greater length
CShort elongation, low melting point alloy, thin wire
DLonger length, lower melting point alloy, thinner wire

Question 9 of 50

The electrolyte in a typical dry cell is-

AZinc
Bsulfuric acid
Cammonium chloride
Dmanganese dioxide

Question 10 of 50

Which instrument measures electrical resistance?

AAmmeter
Bpotentiometer
Cvoltameter
Dohm meter

Question 11 of 50

The cost of energy to operate an industrial refrigerator that uses 5 kW of power when it operates for 10 hours a day for 30 days is [given that the charge per kWh of energy is ₹4]

A₹ 600
B₹ 6,000
C₹ 1,200
D₹ 1,500

Question 12 of 50

Who invented the lightning conductor?

AGraham Bell
BLord Lister
CBenjamin Franklin
DEinstein

Question 13 of 50

Mica is -

Abad conductor of both heat and electricity
Bconductor of both heat and electricity
Cbad conductor of heat and conductor of electricity
Dconductor of heat and bad conductor of electricity

Question 14 of 50

In a three pin electrical plume the longest pin should be connected to-

Afrom the base end
BSanjeev from the beginning
Cfrom an indifferent head
Dfrom any end

Question 15 of 50

The total charge of a charged conductor is its-

Aresides on the inside page
Blives on an external page
CSome are on the inner page and some are on the outer page.
DAll are true

Question 16 of 50

Which of the following is the unit of electric current?

AKelvin
Bmole
Ccandela
DAmpere

Question 17 of 50

Ampere is the unit of measurement of what?

Avoltage
Belectric current
Cresistance
DPower

Question 18 of 50

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 19 of 50

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

Question 20 of 50

The device that converts alternating current into direct current is called-

AInverters
BRectifier
Ctransformer
Dtransmitter

Question 21 of 50

It is measured by the work done in moving a unit positive charge from one point to another in an electric circuit, the distance between those points-

Ato resistance
Bto the potential difference
Cto the stream
Dthe strength of the electric current

Question 22 of 50

If a resistive wire is made longer, then its resistance-

Aincreases
Bdecreases
Cremains constant
DAll of these

Question 23 of 50

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 24 of 50

What is the purpose of choke in fluorescent lamp?

Areducing the flow of current
Bincrease the flow of current
Creduce resistance
DMomentary voltage reduction

Question 25 of 50

Earth is used in electrical equipment for-

Ato reduce expenses
BBecause the appliances operate on 3-phase
CFor safety
DAs a fuse

Question 26 of 50

Tungsten is used in the manufacture of filament of electric bulb because it-

Ahas high specific resistance
Bhas low specific resistance
CHas high light emission capacity
Dhas a high melting point

Question 27 of 50

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 28 of 50

Which metal is used to generate electricity?

AUranium
Baluminium
Ccopper
DIron

Question 29 of 50

When an ebonite rod is rubbed against the skin of a cat, the ebonite rod-

Abecomes negatively charged
BIt becomes positively charged.
Cremains indifferent
Dfirst negatively charged then positively charged

Question 30 of 50

The safety fuse wire used in domestic electrical appliances is made of the metal whose-

Aresistance is low
Bhave a lower melting point
Cthe specific density is low
Dconductivity is low

Question 31 of 50

The instrument used to detect the presence of electric current in a circuit is-

Arefractometer
Bgalvanometer
Cviscometer
Ddiffractometer

Question 32 of 50

"If there is no change in the physical state of a conductor, such as temperature, then the potential difference applied across the conductor is directly proportional to the current flowing through it." This law is---

ACoulomb's law
BOhm's law
CFaraday's law
DKirchhoff's law

Question 33 of 50

How much is 1 volt equal to?

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

Question 34 of 50

What does Ohm's law define?

Aresistance
Bonly stream
Cvoltage only
Dboth current and voltage

Question 35 of 50

Lightning conductors are made of-

Aof iron
Bof aluminum
Ccopper
Dof steel

Question 36 of 50

The SI unit of specific resistance is-

AOm
Bohm-meter
Cohm/meter
Dohm/meter2

Question 37 of 50

The MCB which cuts off the power supply in case of a short circuit works by—

AOn the magnetic effect of current
Belectroplating effect of current
COn the chemical effects of current
DOn the heating effect of current

Question 38 of 50

Which of the following is marked on commonly used fluorescent tube lights?

A220 K
B273 K
C6500 K
D9000 K

Question 39 of 50

Which of the following is not a semiconductor?

AGermanium
BSilicon
CSelenium
DArsenic

Question 40 of 50

When a glass rod is rubbed with silk, the rod-

Abecomes negatively charged
Bbecomes positively charged
Cremains indifferent
Dfirst negatively charged then positively charged

Question 41 of 50

Electricity resides in mercury lamp-

Amercury at low pressure
Bmercury at high pressure
CNeon and mercury
Dnone of these

Question 42 of 50

Kilowatt hour is the unit of what?

Apotential difference
Belectric power
Celectrical energy
Delectric potential

Question 43 of 50

A current carrying conductor is related to-

Afrom the magnetic field
Bfrom the electric field
Cfrom the electromagnetic field
Dfrom the electrostatic field

Question 44 of 50

The electrolyte used in a car battery is—

Ahydrochloric acid
Bsulfuric acid
Cnitric acid
Ddistilled water

Question 45 of 50

house has two bulbs, one of which gives more light than the other. Which of the following statements is correct?

AThe brightness of the light does not depend on the resistance
BBoth bulbs have the same resistance
CThe resistance of the bulb with more light is higher
DDim light bulbs have higher resistance.

Question 46 of 50

"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 47 of 50

'Dry cell' is-

Aprimary cell
BSecondary Cell
Ctertiary cell
Dquartile cell

Question 48 of 50

If the distance between two electric charges is halved, then the value of the electric force between them will become-

Ahalf
Bdouble
Cquadruple
Done fourth

Question 49 of 50

'Faraday's law' is related to-

Aby electrolysis
Bby the pressure of gases
Cby electrical disconnection
Dby electrical propagation

Question 50 of 50

When a soap bubble is charged, then-

AIt shrinks,
BIt spreads
CThere is no change in its size
Dnone of the above