Electricity: MCQ Test (50 questions)

Question 1 of 50

The electrical resistance of a conductor is independent of

Atemperature
Bpressure
Ccross-sectional area
Dlength

Question 2 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 3 of 50

A conductor has a resistance of 440 ohms. How much current will flow through it if it is connected to a 110 volt source?

A0.5A
B0.25A
C4A
D1.25A

Question 4 of 50

The filament of an electric bulb is made of which element?

ACopper
BIron
Clead
Dtungsten

Question 5 of 50

The unit of resistance is-

AAmpere
BCoulomb
CHenry
DOm

Question 6 of 50

battery converts...........energy into electrical energy.

Aheat
Bmechanical
Cchemical
DLight

Question 7 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 8 of 50

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

A220 K
B273 K
C6500 K
D9000 K

Question 9 of 50

Which of the following is the unit of electric current?

AKelvin
Bmole
Ccandela
DAmpere

Question 10 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 11 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 12 of 50

What is the effect of conductive materials on electrical insulation and electrical conductivity when the temperature is increased?

AElectrical resistance increases, while electrical conductivity decreases
BElectrical resistance decreases, while electrical conductivity increases.
CBoth electrical resistance and electrical conductivity increase.
DBoth electrical resistance and electrical conductivity decrease

Question 13 of 50

The algebraic sum of the currents meeting at a point in a circuit is-

Ainfinite
BZero
Cbetween zero and infinity
Dnone of the above

Question 14 of 50

The conversion of chemical energy into electrical energy is as follows:

Aby electrolysis
Bby photosynthesis
Cby respiration
Dby perspiration

Question 15 of 50

'Faraday's law' is related to-

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

Question 16 of 50

Lightning conductors are made of-

Aof iron
Bof aluminum
Ccopper
Dof steel

Question 17 of 50

Which law of physics states that when the distance between two electric charges is doubled, the force between them reduces to one-fourth of its original value?

ACoulomb's law
BPascal's law
CStefan's law
DHooke's law

Question 18 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 19 of 50

Metals are good conductors of electricity because-

Athey contain free electrons
Btheir atoms are lighter
Ctheir melting point is high
DAll of the above

Question 20 of 50

The force between two stationary charges is directly proportional to the product of their quantities and inversely proportional to the square of the distance between them." This law is—

AOhm's law
BKirchhoff's law
CCoulomb's law
DFaraday's law

Question 21 of 50

The device for converting electrical energy into mechanical energy is-

ADynamo
Btransformer
Celectric motor
DInductor

Question 22 of 50

If the electrical resistance of a typical substance drops to zero, what is that substance called?

Asuperconductor
Bsemiconductor
CDriver
Danti-inflammatory

Question 23 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 24 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 25 of 50

By what is alternating current converted into direct current?

AFilter
BRectifier
CMotor
DTransformers

Question 26 of 50

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 27 of 50

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

Aamplifier
Bregulator
CSwitch
DRectifier

Question 28 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 29 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 30 of 50

What is the coating of zinc on iron called?

Agalvanization
Belectroplating
CIonization
DNone of these

Question 31 of 50

Transformers are used in-

ATo convert AC to DC
BTo convert DC to AC
CTo oxidize DC voltage
DTo oxidize or reduce AC voltage

Question 32 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 33 of 50

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

Arefractometer
Bgalvanometer
Cviscometer
Ddiffractometer

Question 34 of 50

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 35 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 36 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 37 of 50

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 38 of 50

The SI unit of specific resistance is-

AOm
Bohm-meter
Cohm/meter
Dohm/meter2

Question 39 of 50

The force between two electric charges is related to-

AAmpere's law
BCoulomb's law:
CFaraday's law
DOhm's law

Question 40 of 50

What does Ohm's law define?

Aresistance
Bonly stream
Cvoltage only
Dboth current and voltage

Question 41 of 50

What is the source of electrical energy in an artificial satellite?

AThermopile
BSolar Cell
Csmall nuclear reactor
DDynamo

Question 42 of 50

Those substances which do not have free electrons in normal state, but free electrons can be obtained under special conditions like high temperature or by adding impurities, are called-

Agood conductor material
Binsulator material
Cdielectric material
Dsemiconductor material

Question 43 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 44 of 50

"The potential difference across the ends of a conductor is directly proportional to the current flowing through it." This law is-

ACoulomb's law
BFaraday's law
CJoule's law
DOhm's law

Question 45 of 50

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 46 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 47 of 50

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

Aincreases
Bdecreases
Cremains constant
DAll of these

Question 48 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 49 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 50 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