# MCQs For NCERT Class 10 Science Chapter 12 Electricity

Please refer to the MCQ Questions for Class 10 Science Chapter 12 Electricity with Answers. The following Electricity Class 10 Science MCQ Questions have been designed based on the current academic year syllabus and examination guidelines for Class 10. Our faculty has designed MCQ Questions for Class 10 Science with Answers for all chapters as per your NCERT Class 10 Science book.

## Electricity Class 10 MCQ Questions with Answers

Please see below Electricity Class 10 Science MCQ Questions, solve the questions and compare your answers with the solutions provided below.

Question: In parallel circuit, which of the following is same across resistors
(a) Current
(b) Potential difference
(c) Resistance
(d) Resistivity

B

Question: Two conducting wires of the same material and of equal lengths and equal diameter are first connected in series and then in parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combinations would be
(a) 1:2
(b) 2:1
(c) 1:4
(d) 4:1

C

Question: When resistance is doubled at constant voltage, current will become.
(a) 1/2
(b) 2 times
(c) 1/4
(d) 4 times

A

Question: When the current passing through each resistor is same, the circuit is called
(a) series circuit
(b) parallel circuit
(b) Both (a) and (b)
(c) None of these

A

Question: Resistance in a circuit if current flowing is doubled will become
(a) double
(b) half
(c) four times
(d) remains same

D

Question: A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel.If the equivalent resistance of this combination is R′, then the ratio R/R′ is
(a) 1/25
(b) 1/5
(c) 5
(d) 25

D

Question: An electric kettle consumes 1 kW of electric power when operated at 220 V. A fuse wire of what rating must be used for it?
(a) 0.454A
(b) 2 A
(c) 4 A
(d) 5 A

A

Question: In an electrical circuit three incandescent bulbs A, B and C of rating 40 W, 60 W and 100 W respectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness?
(a) Brightness of all the bulbs will be the same
(b) Brightness of bulb A will be the maximum
(c) Brightness of bulb B will be more than that of A
(d) Brightness of bulb C will be less than that of B

C

Question: The type of current supplied by cell or battery is
(a) A.C
(b) D.C
(c) Both (a) and (b)
(d) None of these

B

Question: In an electrical circuit two resistors of 2 Ω and 4 Ω respectively are connected in series to a 6 V battery.The heat dissipated by the 4 Ω resistor in 5 s will be
(a) 5 J
(b) 10 J
(c) 20 J
(d) 30 J

C

Question: Unit of electric power may also be expressed as:
(a) volt-ampere
(b) kilowatt-hour
(c) watt-second
(d) joule-second

Question: Identify the circuit (Fig) in which the electrical components have been properly connected.

(a) (i)
(b) (ii)
(c) (iii)
(d) (iv)

B

Question: Electric current flows from ‘A’ to ‘B’ in metallic conductor. The point is at higher potential is
(a) A
(b) B
(c) Both have equal potential
(d) Both have lower potential

A

Question. A cylindrical conductor of length ‘l’. and uniform area of cross-section ‘A’ has resistance ‘R’. The area of cross-section of another conductor of same material and same resistance but of length ‘2l’ is
(a) A/2
(b) 3A/2
(c) 2A
(d) 3A

C

Question. Which of the following terms does not represent electrical power in a circuit ?
(a) I2R
(b) IR2
(c) VI
(d) V2/R

B

Question. Let us consider the current flowing through a metallic wire if the temperature of the entire system increases.
What will happen from the following options ?
(a) Potential difference (V) increases
(b) Resistance (R) decreases
(c) Potential difference (V) decreases
(d) V and R remains the same

C

Question. An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be :
(a) 100 W
(b) 75 W
(c) 50 W
(d) 25 W

D

Question. Electrical resistivity of an alloy of copper and nickel is ________ when compared with the electrical resistivity of an alloy of copper, manganese and nickel.
(a) Same
(b) Double
(c) More
(d) Less

C

Question. Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combinations would be :
(a) 1 : 2
(b) 2 : 1
(c) 1 : 4
(d) 4 : 1

C

Question. The maximum resistance which can be made using four resistors each of resistance 1/2Ω is :
(a) 2 Ω
(b) 1 Ω
(c) 2.5 Ω
(d) 8 Ω

A

Question. Which of the following obeys Ohm’s law ?
(a) Filament of a bulb
(b) LED
(c) Nichrome
(d) Transistor

C

Question. A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R2, then the ratio R/Ris :
(a) 1/25
(b) 1/5
(c) 5
(d) 25

D

Question. There is a dual of 8 ohm resistance on the aerial. Determine the aerial’s new resistance.
(a) 2 Ω
(b) 4 Ω
(c) 7 Ω
(d) 10 Ω

A

Question: Electrical resistivity of a given metallic wire depends upon
(a) its length
(b) its thickness
(c) its shape
(d) nature of the material

D

Question: If electrons flow from A to B, current will flow from
(a) A to B
(b) B to A
(c) It will not flow
(d) None of these

B

Question: A cell, a resistor, a key and ammeter are arranged as shown in the circuit given below. The current recorded in the ammeter will be

(a) maximum in (i)
(b) maximum in (ii)
(c) maximum in (iii)
(d) the same in all the cases

D

Question: When a 4V battery is connected across an unknown resistor there is a current of 100 mA in the circuit.
The value of the resistance of the resister is:
(a) 4 Ω
(b) 40 Ω
(c) 400 Ω
(d) 0.4 Ω

B

Question:Two resistors of resistances 2 Ω and 4 Ω when connected to a battery will have:
(a) same current flowing through them when connected in parallel
(b) same current flowing through them when connected in series
(c) same potential difference across them when connected in series
(d) different potential differences across them when connected in parallel

B

Question: In an electrical circuit, two resistors of 2 Ω and 4 Ω respectively are connected in series to a 6 V battery. The heat dissipated by the 4 Ω resistor in 5 s will be:
(a) 5 J
(b) 10 J
(c) 20 J
(d) 30 J

C

Question: An electric kettle consumes 1 kW of electric power when operated at 220 V. A fuse-wire of what rating must be used for it?
(a) 1 A
(b) 2 A
(c) 4 A
(d) 5 A

D

Question: In an electrical circuit three incandescent bulbs A, B and C of rating 40 W, 60 W and 100 Wrespectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness?
(a) brightness of all the bulbs will be the same.
(b) brightness of bulb A will be the maximum
(c) brightness of bulb B will be more than that of A
(d) brightness of bulb C will be less than that of B

C

Question: Unit of electric power may also be expressed as:
(a) volt ampere
(b) kilowatt hour
(c) watt second
(d) joule second

A

Question. An electric fuse works on the :
(a) chemical effect of current
(b) magnetic effect of current
(c) lighting effect of current
(d) heating effect of current

d

Question. How many joules of electrical energy are transferred per second by a 6 V ; 0.5 A lamp ?
(a) 30 J/s
(b) 12 J/s
(c) 0.83 J/s
(d) 3 J/s

d

Question. At a given time, a house is supplied with 100 A at 220 V. How many 75 W, 220 V light bulbs could be switched on in the house at the same time (if they are all connected in parallel) ?
(a) 93
(b) 193
(c) 293
(d) 393

c

Question. If the potential difference between the ends of a fixed resistor is halved, the electric power will become :
(a) double
(b) half
(c) four times
(d) one-fourth

d

Question. The heat produced by passing an electric current through a fixed resistor is proportional to the square of
(a) magnitude of resistance of the resistor
(b) temperature of the resistor
(c) magnitude of current
(d) time for which current is passed

C

Question. The current passing through an electric kettle has been doubled. The heat produced will become :
(a) half
(b) double
(c) four times
(d) one-fourth

C

Question. The elements of electrical heating devices are usually made of :
(a) tungsten
(b) bronze
(c) nichrome
(d) argon

C

Question. The heat produced in a wire of resistance ‘x’ when a current ‘y’ flows through it in time ‘z’ is given by :
(a) x2 × y × z
(b) x × z × y2
(c) y × z2 × x
(d) y × z × x

B

Question. Which of the following characteristic is not suitable for a fuse wire ?
(a) thin and short
(b) thick and short
(c) low melting point
(d) higher resistance than rest of wiring

B

Question. In a filament type light bulb, most of the electric power consumed appears as :
(a) visible light
(b) infra-red-rays
(c) ultraviolet rays
(d) fluorescent light

B

Question. Keeping the p.d. constant, the resistance of a circuit is halved. The current will become :
(a) one-fourth
(b) four times
(c) half
(d) double

D

Question. The resistance of a wire of length 300 m and cross-section area 1.0 mm2 made of material of resistivity 1.0 × 10–7 Ωm is :
(a) 2 Ω
(b) 3 Ω
(c) 20 Ω
(d) 30 Ω

D

Question. Keeping the resistance constant, the potential difference applied across the ends of a component is halved. By how much does the current change ?

Current becomes half

Question. Which has less electrical resistance : a thin wire or a thick wire (of the same length and same material) ?

Thick wire

Ohm’s law states a relation between potential difference and ……………………

current

Question. What happens to the resistance as the conductor is made thicker ?

Resistance decreases

Question. If the length of a wire is doubled by taking more of wire, what happens to its resistance ?

Resistance gets doubled

Question. Which among iron and mercury is a better conductor of electricity ?

Iron

Question. Name the material which is used for making the heating element of an electric iron.

Nichrome

True or False :

Question. A dentist uses a convex mirror to view the inner parts of a patient’s mouth.

True

Question. Two wires of resistances 2 W and 4 W are connected in series. The combination is connected to a 220 V supply. The power dissipated in 2 W resistor is more.

False

Question. The temperature coefficient of resistance of a wire is 0.00125/cC. The resistance of the wire is 1 ohm at 300 K. The resistance will be 2 ohm at 1100 K.

False

Question. The sun looks red at sunset because most of the blue light in sun rays is scattered leaving behind red yellow lights.

False

Question. The series arrangement is used for domestic circuits.

False

Question. Fuse is a thin wire which melts and breaks the electric circuit due to only high voltage.

False

Question. Clouds look white because water droplets of clouds scatter all colours of light equally.

False

Question. In the circuit to verify Ohm’s law, ammeter and voltmeters both are connected in series with resistance and cell in the circuit.

False

Question. The equivalent resistance of several resistors in series is equal to the sum of their individual resistances.

True

Question. Two wires of resistances 2 Ω and 4 Ω are connected in parallel. The combination is connected to a 220 V supply. The power dissipated in 2 Ω resistor is more.

True

Fill in the following blanks :

Question. ……… is a property that resists the flow of electrons in a conductor.

Resistance

Question. In a parallel circuit, each circuit, each circuit element has the same ……….

Potential difference

Question. The rate at which electrical work is done, known as ……………

Electric power

Question. In parallel connection, of electrical appliances, overall resistance of household circuit is …………….

reduced

Question. …………… is the best conductor of electricity.

Silver metal.

Question. One watt of power is consumed when 1 A of current flows at a potential difference of ………

1 V

Question. Potential difference is a ………. quantity.

Scalar

Question. 1 volt X1 conductor.

Joule

Question. Materials whose resistivity suddenly becomes ………. at a particular critical temperature is called as ………..

zero, superconductor

Question. Two resistances of 2 W each are connected in parallel. The equivalent resistance is ………. .

1 W

Question. Current is considered as ………. along the direction of flow of ………. charge and opposite for ……….. charge.

positive, positive, negative

Question. The unit of power is ……….

watt (W)

Question. The resistance of a wire is ……… proportional to the square of its radius.

Inversely

Question. Current = Charge x

time

Question. Resistance is measured in………… The resistance of a wire increases as the length………; as the

Ohms ; increases

Question. temperature…………. ; and as the cross-sectional area………….

increases ; decreases

Question. Give the law of combination of resistances in series.

1 ohm

Question. If 3 resistances of 3 ohm each are connected in parallel, what will be their total resistance ?

1 ohm

Question. How should the two resistances of 2 ohms each be connencted so as to produce an equivalent resistance of 1 ohm ?

In parallel

Question. Two resistances X and Y are connected turn by turn : (i) in parallel, and (ii) in series. In which case the resultant resistance will be less than either of the individual resistances ?

In parallel

In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
(a) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.

Question: Assertion: In series combination of 200 W, 100 W and 25 W bulbs, the bulb of 200 W bulb shine most brightly.
Reason: 25 W has maximum resistance and so p.d. across it is maximum.

D

Question: Assertion: The connecting wires are made of copper.
Reason: Copper has very high electrical conductivity.

A

Question: Assertion: The total potential in system of resistors connected in series is equal to the sum of the individuals‘ potentials across each resistor.
Reason: The total current in system of resistors connected in parallel is equal to the sum of the individuals‘ currents moving through each resistor.

B

Question: Assertion: Electric current flow from a body at 15 V to 10 V.
Reason: Electric current flow from a body at higher potential to lower potential.

A

Question: Assertion: A fuse used in electric circuit has high resistance and low melting point.
Reason: During the flow of any unduly high electric current the fuse wire melts and protects the circuits and appliances

A

Question: Assertion: The resistance of a given mass of copper wire is inversely proportional to the square of length.
Reason: When a copper wire of given mass is stretched to increase its length, its cross-sectional area also decreases.

D

Question: Assertion: According to Joules law of heating, the head produced in a resistor increases with the magnitude of current, resistance and time.
Reason: According to Joules law of heating, the heat produced in a resistor is directly proportional tothe square of the current for a given resistance.

A

Question: Assertion: In domestic electric circuits, the wires in the supply, usually with read insulation cover, is called live wire (or positive)
Reason: Another wire, with black insulation, is called neutral wire (or negative)

B

Question:  Assertion: The commercial unit of electrical energy is kilowatt hour.
Reason: The SI unit of power is volt.

C

Question:  Assertion: In domestic electric circuits, metallic body is connected to the earth wire, which provides alow-resistance conducting path for the current.
Reason: It ensures that any leakage of current to the metallic body of the appliance keep its potential to that of the earth, and the user may not get a severe electric shock.

A

Question: Assertion: The phenomenon of the conduction of electricity through electrolytes and chemical decomposition is called cracking.
Reason: The phenomenon of the conduction of electricity through electrolytes and chemical decomposition is called electrolysis.

D

(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true.
(e) Both Assertion and Reason are false.

Question. Assertion : Two resistance having value R each. Their equivalent resistance is R/2 .
Reason : Given Resistance is connected in parallel.

A

Question. Assertion : When the length of a wire is doubled, then its resistance also gets doubled.
Reason : The resistance of a wire is directly proportional to its length.

A

Question. Assertion : When the resistances are connected endto- end consecutively, they are said to be in series.
Reason : In case the total resistance is to be increased, then the individual resistances are connected in series.

B

Question. Assertion : A tube light emits white light.
Reason : Emission of light in a tube takes place at a very high temperature

C

Question. Assertion : In a simple battery circuit the point of lowest potential is positive terminal of the battery.
Reason : The current flows towards the point of the lower potential as it flows in such a circuit from the negative to the positive terminal.

D

Question. Assertion : The product of resistivity and conductivity of a conductor depends on the material of the conductor.
Reason : Because each of resistivity and conductivity depends on the material of the conductor.

C

Question. Assertion : The connecting wires are made of copper.
Reason : The electrical conductivity of copper is high.

A

Question. Assertion : Electric appliances with metallic body have three connections, whereas an electric bulb has a two pin connection.
Reason : Three pin connections reduce heating of connecting wires.

C

Case study questions

1. Ohm’s law gives the relationship between current flowing through a conductor with potential difference across it provided the physical conditions and temperature remains constant. The electric current flowing in a circuit can be measured by an ammeter.
Potential difference is measured by voltmeter connected in parallel to the battery or cell. Resistances can reduce current in the circuit. A variable resistor or rheostat is used to vary the current in the circuit.

Question: What type of conductor is represented by the following graph?

(a) Non-ohmic conductor like thermistor
(b) Non-ohmic conductor like metal filament
(c) Ohmic conductor like copper
(d) None of these

C

Question: What type of conductors are represented by the following graph?

(a) Non-ohmic conductor like thermistor
(b) Non-ohmic conductor like metal filament
(c) Ohmic conductor like copper
(d) None of these

B

Question: Which type of conductor is represented by the graph given alongside?

(a) Non-ohmic conductor like thermistor
(b) Non-ohmic conductor like metal filament
(c) Ohmic conductor like copper
(d) None of these

A

Question: What is the slope of graph in (i) equal to?
(a) V
(b) I
(c) R
(d) VI

C

Question: Which of the following is the factor on which resistance of a conductor does not depend?
(a) Length
(b) Area
(c) Temperature
(d) Pressure

D

2. Study this table related to material and their resistivity and answer the questions that follow.

Question: Which property of the alloy makes it useful in heating devices like electric iron, toasters,immersion rods, etc.?
(a) Higher resistivity
(b) Do not oxidise at low temperature
(c) Do not reduce at high temperature
(d) Oxidise at high temperature

A

Question: Which of the following is used in transmission wires?
(a) Cr
(b) Al
(c) Zn
(d) Fe

B

Question: Which of the following is used as a filament in electric bulbs?
(a) Nichrome
(b) Tungsten
(c) Manganese
(d) Silver

B

Question: What is the range of resistivity in metals, good conductors of electricity?
(a) 10–8 to 10–6 Ωm
(b) 10–6 to 10–4 Ωm
(c) 1010 to 1014 Ωm
(d) 1012 to 1014 Ωm

A

Question: Which is the best conducting metal?
(a) Cu
(b) Ag
(c) Au
(d) Hg

B

ONE MARK QUESTIONS

Question: When one coulomb of charge flows in one second across any cross section of a conductor, the current in it is one _______

ampere

Question: The electric potential of a charge at infinity is _______

zero

Question: The potential difference between two points in a current carrying conductor when 1 joule of work is done to move a charge of 1 coulomb from one point to the other is          1 volt

1 volt

Question: The direction of electric current is taken as opposite to the direction of the flow of _______

electrons

Question: Charges will move in a conductor if there is a _______across their end.

Potential difference

Question: _______states that at constant temperature the steady current (I) flowing through a conductor is directly proportional to the potential difference (V) between its ends.

Ohm’s law

Question: The mathematical formula to calculate resistance is _______

R = V/I

Question: Positive charges move from _______to _______potential regions. Electrons, being negatively charged,move from lower to higher potential regions.

higher, lower

Question: Any material which has some resistance is called a _______

Resistor

Question: The amount of work done if a body is given a charge Q coulomb raise its potential by V volt is ______

VQ

Question: The resistance of an air gap is _______

Infinity

Question: 1 kW = _______W

1000W

Question: The resistance of a closed plug-key is _______

Zero

Question: The property of a conductor to resist the flow of charges through it is called _______

Resistance

Question: If the resistors are connected to end to end, then we say that the resistors are connected in _______