A $$10\ k\Omega$$ resistor can be obtained by using

$$3\ k\Omega,5\ k\Omega,2\ k\Omega$$ resistors in series

$$3\ k\Omega,5\ k\Omega,2\ k\Omega$$ Resistors in parallel

$$3\ k\Omega,5\ k\Omega$$ in series and combination in parallel to $$2\ k\Omega$$ resistor in series

$$5\ k\Omega,5\ k\Omega,2\ k\Omega,$$ Resistors in series

conduct electricity only at low temperatures.

conduct electricity at room temperature.

MCQ Questions for Class 10 Physics Electricity Quiz 3

A substance that allows electricity to pass through it, is called ______

0%
electrical conductor
0%
electrical insulator
0%
electrical semiconductor
0%
None of these

State whether given statement is True or False.
Silver is a good conductor of electricity.

0%
True
0%
False

Human nails are good insulators

0%
True
0%
False

________are substances which do not allow electricity to pass through them.

0%
Insulators
0%
Conductors
0%
Semi-conductors
0%
None of these

Explanation

The substance which do not allow electricity to pass through them are called

$insulators$ .

Answer-(A)

Find odd man out

Plastic, Rubber, Glass, Silver

0%
Glass
0%
Rubber
0%
Silver
0%
Plastic

For a heater rated at

$4.4 \ kW \ , \ 220 \ V$ . Calculate the current drawn by the heater.

0%
$40 \ A$
0%
$20\ A$
0%
$12.6 \ A$
0%
$0 \ A$

Explanation

Given:

$V =220$ volts

$P = 4.4 \ kW = 4400 \ W$

Since,

$P = VI$

Current drawn by heater

$I =\dfrac{P}{V} = \dfrac{4400}{220} = 20 \ A$

For a heater rated at

$4 \ kW$ ;

$220 \ V$ . Calculate the resistance of the heater element.

0%
$20 \Omega$
0%
$21.6\Omega$
0%
$200\Omega$
0%
$12.2\Omega$

Explanation

Given:

$V =220$ volts

$P = 4000$ W

Electric power is given by

$P=\dfrac{V^2}{R}$ where

$R$ is resistance and

$V$ is voltage.

$\therefore$ Resistance of the heater

$R = \dfrac{V^2}{P} =\dfrac{220^2}{4000} = 12.1\Omega$

For a heater rated at 4.4 KW; 220 V, calculate the energy consumed by the heater in 4 hours?

0%
12 KWh
0%
17.6 KWh
0%
0 KWh
0%
4.4 KWh

Explanation

Given :

$P = 4.4$ KW,

$t = 4$ h

$\therefore$ Energy consumed in 4 h

$\Rightarrow E= P\times t =4.4\times 4 = 17.6$ kWh

Mark the correct reason why a fuse is always connected in series

0%
When fuse melts, it breaks down the entire home circuit and no current flows
0%
In series connection the current for the entire house pass through the fuse
0%
Both
0%
None

Explanation

A fuse is always connected in series because

when fuse melts, it breaks down the entire home circuit and no current flows

$\rightarrow$ In series connection the current for the entire house pass through the fuse

Motion of charges is nothing but:

0%
electric current
0%
magnetic effect of current
0%
heating effect of current
0%
all of the above

The rate of flow of electric charges is known as:

0%
Electric potential
0%
Electric conductance
0%
Electric current
0%
None of these

Explanation

Electric current is defined as the rate of flow of electric charges.

Current

$I = \dfrac{q}{t}$

$A$ , where

$q$ is the amount of charge that flows in time

$t$ .

The SI unit of electric current is:

0%
Ohm
0%
Ampere
0%
Volt
0%
Faraday

Explanation

Electric current is defined as the rate of flow of electric charges.

Current

$I = \dfrac{q}{t}$

The electric current is expressed by a unit called ampere (A), named after the French scientist, Andre-Marie Ampere.

The source of electricity in a flash torch is its bulb.

0%
True
0%
False

An electric bulb is rated

$750 \ W - 200 \ V$ . Calculate the magnitude of current.

0%
$200 \ A$
0%
$3.75 \ A$
0%
$15 \ A$
0%
$2 \ A$

Explanation

Given, voltage

$V = 200 \ V$ , Power

$P = 750 \ W$ .

Using ,

$P = Vi$

$i = \dfrac{P}{V} = \dfrac{750}{200} = 3.75 \ A$

Hence,

$i = 3.75 \ A$ .

Heating effect of current is due to

0%
the flow of voltage through the conductor.
0%
the flow of current through a conductor.
0%
both A and B.
0%
neither A nor B.

Explanation

Whenever an electric current passes through a conductor, it gets heated up. The amount of heat produced is directly proportional to the square of the current (

$H\propto i^2$ ).

When a current flows through a conductor its temperature

0%
May increase or decrease
0%
Remains same
0%
Decreases
0%
Increases

Calculate the current through a lamp of 25w operating at 220v.

0%
2A
0%
25A
0%
0.114A
0%
6A

Explanation

Given :

$P = 25$ W

$V= 220$ volts

$\therefore$ Current through the lamp

$I = \dfrac{P}{V} = \dfrac{25}{220} = 0.114$ A

The direction of current is taken as

0%
The opposite to the direction of flow of current.
0%
Opposite to the direction of flow of protons.
0%
Opposite to the direction of flow of electrons.
0%
All

When resistances are connected in series

0%
Same voltage is applied across all resistors
0%
Resistances must be same
0%
Same current flows through all resistances
0%
All

Explanation

The electrical components are said to be connected in series if physically same amount of current flows through them whereas potential difference gets divided according to the resistance across each component . Thus same current flows through all resistances which are connected in series.

This is because the current entering the one end of the series combination must leave its other end entirely because the combination doesn't store any charge.

i.e.

$I_{entering}=I_{leaving}$

An electric stove uses _________ resistances.

0%
High
0%
Low
0%
Medium
0%
None

Explanation

According to Joule’s law of heating, heat produced in a resistor

$(H)$ is

(i) directly proportional to the square of current

$(I)$ for a given resistance

(ii) directly proportional to resistance

$(R)$ for a given current, and

(iii) directly proportional to the time

$(t)$ for which the current flows through the resistor

$H=I^2Rt$

An electric stove uses high resistance.

A bulb uses 5000J of energy in 10s, calculate its power.

0%
50 $J/s$
0%
500 $Watts$
0%
5 $Watts$
0%
600 $J/s$

Explanation

Given :

$E = 5000$ J

$t = 10$ s

Power of the bulb

$Power=\dfrac{Energy \quad spent}{Time}$

$P = \dfrac{E}{t} = \dfrac{5000}{10} = 500$

$Watts$

SI unit of electrical energy is

0%
Joule
0%
Kilowatt hour
0%
KiloJoule
0%
Watt hour

Explanation

SI unit of electrical energy is Joule.

$1 Joule = 1 Volt \times 1 ampere \times 1 second$

An electric bulb works on the principle of:

0%
Archimedes
0%
Heating effect of current
0%
Magnetic effect of current
0%
None of these

What is the series equivalent of

$1000 \ \Omega$ resistor and

$2700 \ \Omega$ resistor in series?

0%
$2700 \ \Omega$
0%
$3000 \ \Omega$
0%
$3700 \ \Omega$
0%
$1000 \ \Omega$

Explanation

Given :

$R_1 = 1000\Omega$

$R_2 = 2700\Omega$

Equivalent resistance in series combination is given by

$R_{eq} = R_1+R_2 = 1000+2700 = 3700$

$\Omega$

What is the total resistance when four resistors of

$20, 40, 60$ , and

$80$ respectively are connected in parallel (in ohm)?

0%
$4.4$
0%
$9.6$
0%
$14.8$
0%
$20$
0%
$25.2$

Explanation

Given :

$R_1 =20\Omega$

$R_2 =40\Omega$

$R_3 =60\Omega$

$R_4 =80\Omega$

Equivalent resistance for parallel combination

$\dfrac{1}{R_{eq}} = \dfrac{1}{R_1} +\dfrac{1}{R_2}+\dfrac{1}{R_3}+\dfrac{1}{R_4}$

$\therefore$

$\dfrac{1}{R_{eq}} = \dfrac{1}{20} +\dfrac{1}{40}+\dfrac{1}{60}+\dfrac{1}{80}$

$\implies R_{eq} =9.6\Omega$

Identify the changes in a circuit on adding a light bulb in parallel to the actual resistance of the circuit. It will:

0%
Decrease the total resistance
0%
Increase the total resistance
0%
Make the voltage lost in each light bulb different
0%
Make the current through each light bulb the same
0%
Not change the total current through the circuit

Explanation

For the parallel combination of two resistances

$\dfrac{1}{R_{eq}} =\dfrac{1}{R_1} +\dfrac{1}{R_2}$

$\Rightarrow R_{eq}< min {R_1, R_2}$

Light bulb has its own resistance and hence the total resistance of the circuit decreases when it is connected in parallel to the actual resistance of the circuit.

$10\ k\Omega$ resistor can be obtained by using

0%
$3\ k\Omega,5\ k\Omega,2\ k\Omega$ resistors in series
0%
$3\ k\Omega,5\ k\Omega,2\ k\Omega$ Resistors in parallel
0%
$3\ k\Omega,5\ k\Omega$ in series and combination in parallel to $2\ k\Omega$ resistor in series
0%
$5\ k\Omega,5\ k\Omega,2\ k\Omega,$ Resistors in series

Explanation

When three resistors are connected in series, the equivalent resistance is

$R_{eq}=R_1+R_2+R_3$ .

In the question,

$R_1=3\ k\Omega$ ,

$R_2=5\ k\Omega$ ,

$R_3=2\ k\Omega$ .

$\therefore R_{eq}=3+5+2 = 10\ k\Omega$

Current in circuit, which makes bulb glow or heats up the wire, is:

0%
motion of charges
0%
motion of atoms
0%
motion of molecules
0%
none of the above

The amount of charges that pass any section of the conductors in one second is called:

0%
Current
0%
Power dissipation
0%
Electromotive force
0%
Internal resistance

Explanation

Current is defined as the amount of charges that passes any section of the conductors in one second.

$i = \dfrac{Q}{t}$

$Q$ ; the amount of charges passing through cross section area

Identify the changes in a circuit on adding a light bulb to a series circuit. It will:

0%
increase the total resistance
0%
make the current through each light bulb different
0%
decrease the total resistance
0%
change the voltage of the battery
0%
make the voltage lost in each light bulb equal

Explanation

For series combination of two resistances

$R_{eq} = R_1 + R_2$

Light bulb has its own resistance and thus the total resistance of the circuit increases when it is connected in series with the circuit.

What is the equivalent resistance of three

$1000 \ \Omega$ resistors in series?

0%
$1000 \ \Omega$
0%
$3000 \ \Omega$
0%
$2000 \ \Omega$
0%
$1100 \ \Omega$

Explanation

Given :

$3$ resistors of resistance

$R = 1000 \ \Omega$

Equivalent resistance in series combinationis given by,

$R_{eq} = R_1+R_2+R_3$

$R_{eq} = R+R+R = 3R = 3000 \ \Omega$

What is the power produced by an appliance marked "240 V, 2 A"?

0%
8.3 mW
0%
60 W
0%
120 W
0%
480 W

Explanation

$V=240 , I=2A$

Power,

$P=V\times I=240\times 2=480W$

Which of the following is an insulator?

0%
Wood
0%
Iron
0%
Carbon
0%
Silver

Conventional current is the direction of electric current from positive terminal of a cell to negative terminal.

0%
True
0%
False

Electricity is a form of ____________

0%
Force
0%
Energy
0%
Tension
0%
Shock

Insulators

0%
conduct electricity.
0%
do not conduct electricity.
0%
conduct electricity only at low temperatures.
0%
conduct electricity at room temperature.

Explanation

$\textbf{Explanation}$

$\bullet$ Insulators doesn’t have free electrons , so current doesn’t flow through them.

$\bullet$ Hence they are not able to transfer electricity untill very high temperature is applied. Thus, insulators do not conduct electricity.

$\textbf{ Hence option B correct}$

Your are given three equal resistances. In how many combinations can they be arranged?

0%
Three
0%
Four
0%
Five
0%
Two

Which of the following component is connected in parallel in the circuit?

0%
Rheostat
0%
Capacitor
0%
Bulb
0%
LED

The equivalent resistance due to series connection of

$10\ \Omega$ and

$10\ \Omega$ resistors is

0%
$5\ \Omega$
0%
$10\ \Omega$
0%
$0\ \Omega$
0%
$20\ \Omega$

Explanation

For series connection(Current remains same):

$R_{ (total)} = R_1 + R_2$

In series combination equivalent resistance is total sum of the resistances.

$\Rightarrow R_{total}=10+10$

$\Rightarrow R_{total}=20\Omega$

If three resistors 2 ohm, 3 ohm and 4 ohm are connected in series, then effective resistance in a circuit will be _______ ohm.

0%
9
0%
6
0%
1
0%
5

Explanation

$R_{eq}=R_1 + R_2 + R_3$

$=2+3+4= 9 \Omega$

State whether given statement is True or False
In conductors, the innermost electrons are free to move :

0%
True
0%
False

Which of the following is not a correct statement with respect to the given circuit?

0%
Switch $S$ is closed
0%
Current is flowing in the circuit
0%
$B$ and $C$ are connected in series
0%
$A$ is connected in series to $B$ and $C$

Materials that allow electrons to flow through them are known as

0%
Insulator
0%
Conductors
0%
Electrolytes
0%
Bases

State whether given statement is True or False
The total resistance of a series circuit is equal to the difference between the largest and smallest value resistors.

0%
True
0%
False

Explanation

A series circuit is a circuit in which resistors are arranged in a chain, so the current has only one path to take. The current is the same through each resistor. The total resistance of the circuit is found by simply adding up the resistance values of the individual resistors:

equivalent resistance of resistors in series :

$R_s = R_1 + R_2 + R_3 + ...$

Series aiding is a term sometimes used to describe voltage sources of the same polarity in series.

0%
True
0%
False

If the equivalent resistance is to be increased, then the number of resistances should be connected in:

0%
Series
0%
Parallel
0%
Mixed arrangement
0%
None of the above

Explanation

Equivalent resistance is maximum and current flow is minimum when number of resistances are connected in series.

$R_{eq}= R_1 + R_2 + R_3$ ; where

$R_1,R_2,R_3$ are resistances.

Why is electrical wiring usually made from copper?

0%
Because copper is shiny.
0%
Because copper conducts electricity.
0%
Because copper is not magnetic
0%
none of these

Which of the following is true:

The direction of electric current in a conducting wire is _______

0%
in the direction of negatively charged particles but opposite to the positively charged particles
0%
in the direction of motion of electrons
0%
opposite to the direction of motion of electrons
0%
in the direction opposite to the motion of positively charged particles

What is the unit of electric charge in SI system?

0%
Coulomb
0%
Volt
0%
Watt
0%
Ampere

In any electric circuit, when the switch is on and the current is flowing through it why do the wire, switches, bulb or devices in the circuit become hot?

0%
Because of the heating effect of electric current
0%
Because of the magnetic effect of electric current
0%
Because of the luminous effect of electric current
0%
None of these

CBSE Questions for Class 10 Physics Electricity Quiz 3 - MCQExams.com

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Practice Class 10 Physics Quiz Questions and Answers

CBSE Questions for Class 10 Physics Electricity Quiz 3 - MCQExams.com

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Practice Class 10 Physics Quiz Questions and Answers

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