CBSE Questions for Class 10 Physics Electricity Quiz 8 - MCQExams.com

An electricity bulb of 100 watt is connected to  supply of electricity of 220V. Resistance of filament is
  • $$\displaystyle 484\Omega $$
  • $$\displaystyle 100\Omega $$
  • $$\displaystyle 22000\Omega $$
  • $$\displaystyle 242\Omega $$
When two resistances $$\displaystyle { R }_{ 1 }$$ and $$\displaystyle { R }_{ 2 }$$ are connected in series, they consume 12W power. When they are connected in parallel, they consume 50W power. What is the ratio of the powers of $$\displaystyle { R }_{ 1 }$$ and $$\displaystyle { R }_{ 2 }$$
  • $$1/4$$
  • $$4$$
  • $$3/2$$
  • $$3$$
Watt hour represents:
  • Electric energy
  • Current
  • Voltage
  • Power
Unit used in selling electrical energy to consumer is:
  • $$Volt-Ampere$$
  • $$Kilowatt-hour$$
  • $$Volt/second$$
  • None of these
Number of KWh in 1 Joule.
  • $$\displaystyle 3.6\times { 10 }^{ 6 }\ KWh$$
  • $$\displaystyle 2.77\times { 10 }^{ -7 }\ KWh$$
  • $$\displaystyle 600\ KWh$$
  • $$\displaystyle 1.6\times { 10 }^{ -19 }\ KWh$$
In the circuit, $$\displaystyle 5\Omega $$ resistor develops 45J/s due to current flowing through it. The power developed per second across $$\displaystyle 12\Omega $$ resistor is:
451249_e915d42edf5449f2968db0b330cc3033.png
  • 16W
  • 192W
  • 36W
  • 64W
The equivalent resistance of parallel combination is:
  • Lower than the value of lowest resistance in the combination
  • Higher than the value of lowest resistance in the combination
  • Both A and B
  • None of these
How much current is drawn by the motor of 1 H.P. from 220 volt supply.
  • 3.4A
  • 2A
  • 6A
  • 22A
A bulb of $$22\ \Omega $$ is producing light when connected to a $$220\ V$$ supply. What is the electric power of the bulb?
  • $$2200\ W$$
  • $$1000\ W$$
  • $$22\ W$$
  • $$220\ W$$
Calculate the monthly bill if a heater of 100 watt is used at the rate of rs. 1 per unit for 1 hour daily.
  • Rs. 200
  • Rs. 6000
  • Rs. 100
  • Rs. 3
An electric bulb of resistance of $$1000   \Omega$$ draws a current of $$0.05   A$$. Calculate the power of the bulb :
  • $$500 \ W$$
  • $$25 \ kW$$
  • $$250 \ W$$
  • $$650 \ W$$
An electric bulb of resistance $$20   \Omega$$ draws a current of $$0.04   A$$. Calculate the potential difference at the ends.
  • $$0.8 V$$
  • $$2 V$$
  • $$0.032 V$$
  • $$5 V$$
The attached circuit diagram shows connection of 3 resistors. All are connected in parallel . Thus what is the equivalent resistance.

462688_840eed5b500a4447a25eb273ea5e9536.png
  • 1 ohm
  • 4 ohm
  • 3ohm
  • 2 ohm
A certain household has consumed $$250$$ units of energy during a month. How much energy is this in joules?
  • $$9 \times 10^{10}\ J$$
  • $$9 \times 10^{8}\ J$$
  • $$9 \times 10^{9}\ J$$
  • $$9 \times 10^{-8}\ J$$
Find energy in kWh consumed in 10 hours by four devices of power $$500\ W$$ each?
  • $$10\ kWh$$
  • $$20\ kWh$$
  • $$30\ kWh$$
  • $$40\ kWh$$
Smallest commercial unit of energy is
  • Kilowatt hour
  • Watt second
  • Watt hour
  • Watt minutes
Convert $$28.8  kJ$$ into kilo watt hour.
  • $$8 \times {10}^{-3} kwh$$
  • $$8 kwh$$
  • $$8 \times {10}^{3} kwh$$
  • None of these
Calculate the equivalent resistance when two resistances of $$3\ \Omega$$ and $$6\ \Omega$$ are connected in parallel.
  • $$1 \ \Omega$$
  • $$3 \ \Omega$$
  • $$2 \ \Omega$$
  • $$6 \ \Omega$$
If n resistance (each R) are connected in parallel then the resultant will be
  • $$nR$$
  • $$R/n$$
  • $$\displaystyle { n }^{ 2 }R$$
  • $$\text{None}$$
Commercial unit of energy is .......................
  • Joule
  • Volt
  • Kilowatt hour
  • Watt second
Whenever an electric current is passed through a conductor, it gets heated up. this means that a part of electrical energy given to the conductor gets converted to 
  • potential energy
  • gravitational energy
  • heat energy
  • none of these
Imagine that you have a 100$$\Omega$$ resistor. You want to add a resistor in series with this 100$$\Omega$$ resistor in order to limit the current to 0.5A when $$110 $$ Volts is placed across two resistors in series. How much resistance should you use?
  • $$100\Omega$$
  • $$120  \Omega$$
  • $$250 \Omega$$
  • $$300 \Omega$$
What is the highest equivalent resistance that can be secured by combinations of four coils of resistance $$4\ \Omega$$, $$8\ \Omega$$, $$12\ \Omega$$, $$24\ \Omega$$?
  • $$24\ \Omega$$
  • $$48\ \Omega$$
  • $$12\ \Omega$$
  • $$4\ \Omega$$
A wire of resistance R is elongated n-fold to make a new uniform wire. The resistance of new wire
  • $$nR$$
  • $$n^2R$$
  • $$2nR$$
  • $$2n^2R$$
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 $$\dfrac{R}{R'}$$ is - 
  • $$\dfrac{1}{25}$$
  • $$\dfrac{1}{5}$$
  • $$5$$
  • $$25$$
The resistance across $$A$$ and $$B$$ in the given figure will be:
467016.png
  • $$3R$$
  • $$R$$
  • $$\cfrac{R}{3}$$
  • None of the above
An electric bulb is rated $$220\ V$$ and $$100\ W%$$. When it is operated on $$110\ V$$, the power consumed will be:
  • $$100\ W$$
  • $$75\ W$$
  • $$50\ W$$
  • $$25\ W$$
In shown diagram, if voltage of battery is doubled and resistance kept constant then what is the new Power dissipated at resistor(Consider $$P$$ was the initial power dissipation) ?

479418_f36c840b0e314ae0af3d95fee643e382.jpg
  • $$\dfrac{P}{4}$$
  • $$\dfrac{P}{2}$$
  • P
  • 2P
  • 4P
Five resistors each of $$1\ ohm$$ are connected in parallel. The resultant resistance of the combination is
  • $$5\Omega$$
  • $$1\Omega$$
  • $$0.2\Omega$$
  • $$2\Omega$$
If a third identical resistor is added in parallel in a circuit of two identical parallel resistors. Calculate the ratio of the new equivalent resistance to the old?
  • $$\dfrac{4}{9}$$
  • $$\dfrac{2}{3}$$
  • $$1$$
  • $$\dfrac{3}{2}$$
  • $$\dfrac{9}{4}$$
Three resistor of $$10 \Omega$$, $$20 \Omega$$, and $$30 \Omega$$ are connected in parallel in a circuit. Calculate the equivalent resistance.
  • $$6000 \ \Omega$$
  • $$0.017 \ \Omega$$
  • $$1 \ \Omega$$
  • $$60 \ \Omega$$
  • $$5.45 \ \Omega$$
Three resistors $$R_1, R_2$$, and $$R_3$$ are connected as shown below.
The resistance of $$R_3$$ is $$1 \Omega$$ and it is known that the value of $$R_3$$ is smaller than the values of $$R_1$$ or $$R_2$$. The resistances of $$R_1$$ and $$R_2$$ are unknown.
Select the best statement describing the equivalent resistance of this combination:

496321.jpg
  • The equivalent resistance of this combination must be lower than $$1\Omega$$.
  • The equivalent resistance of this combination may be lower than $$1\Omega$$.
  • The equivalent resistance of this combination must be greater than $$1\Omega$$.
  • The equivalent resistance of this combination may be greater than $$1\Omega$$.
  • The equivalent resistance of this combination cannot be estimated without additional information.
In a DC circuit when a switch is closed to operate the circuit, the electrons that cause the current:
  • travel from the negative plate of the battery to the positive plate
  • travel from the positive plate of the battery to the negative plate
  • travel from one resistance to the next resistance
  • travel from the negative plate of the battery to the positive plate inside the battery
  • travel from one atom in the circuit to the next atom
A current is flowing in a circuit consisting of a resistor and a battery.
What happens to the power dissipated in the resistor when the resistance is quadrupled and the voltage remains constant?
  • It is doubled
  • It is quadrupled
  • It is halved
  • It is quartered
  • It remains the same
Calculate the unknown resistance R of the circuit as shown in figure, all resistance are connected in the series. The current is flowing through circuit is 2A and battery is of 20 voltage.

487234.png
  • $$1 \Omega$$
  • $$2 \Omega$$
  • $$4 \Omega$$
  • $$6 \Omega$$
  • $$12 \Omega$$
A 100 and a 50 ohm  resistor are wired to a 12 V battery as shown in the diagram below. From the list of statements listed below please select the correct statements.
496294.jpg
  • These resistors are wired in parallel.
  • These resistors are wired in series.
  • The potential difference across these resistors is the same.
  • The potential difference across the 100 resistor is higher.
  • The electrical current passing through the 50 resistor is half the current through the 100 resistor.
Three resistors ($$2, 5$$ and $$7$$ ohm) are wires as shown in the diagram. The equivalent resistance of this combination (in ohm) is:
496296.jpg
  • $$\dfrac{59}{70}$$
  • $$\dfrac{70}{59}$$
  • $$\dfrac{1}{14}$$
  • $$14$$
  • Cannot be determined without additional information.
This question relates to the DC circuit shown below.
The values for current, voltage, and resistance in the circuit are graphed from point A through point G in the graphs directly below.
Which of the graphs shows the resistance from point A to point G?

480187.jpg
  • A
  • B
  • C
  • D
  • E
An electric circuit contains an operating heating element and a lit lamp. Which statement best explains why the lamp remains lit when the heating element is removed from the circuit?
  • The lamp and heating element were connected in parallel.
  • The lamp has less resistance than the heating element.
  • The lamp has more resistance than the heating element.
  • The lamp and heating element were connected in series.
All resistors in the circuit have the same resistance, $$R$$, and the battery is having a constant voltage of $$V$$.
Find out power dissipated by resistor $$f$$. Given that  the power dissipated by resistor $$e$$ is $$P$$:
479865.jpg
  • $$\dfrac{P}{6}$$
  • $$\dfrac{P}{3}$$
  • $$\dfrac{P}{2}$$
  • $$P$$
  • $$2P$$
Two electrical bulbs have tungsten filament of same length. If one of them gives 60 watts and other 100 watts, then
  • 100 watts bulb has thicker filament
  • 60 watt bulb has thicker filament
  • Both filaments are of same thickness
  • It is impossible to get different wattage unless lengths are different
What is the power dissipated by each lamp of resistance $$60 \Omega$$?
523167_9a9528ae0b134edba911e59c4148ea51.png
  • 1 W
  • 2 W
  • 6 W
  • 12 W
Metals are good conductor because
  • outer electrons are strongly bound to the atom.
  • outer electrons are loosely bound to the atom.
  • inner electrons are loosely bound to the atom.
  • protons can detach from the nucleus and conduct electricity.
If four resistances, each of value $$1\ ohm$$, are connected in series, what will be the resultant resistance?
  • 3 ohm
  • 4 ohm
  • 5 ohm
  • 2 ohm
The dry cell of E.M.F $$12\ V$$, is connected in series to a $$3 \Omega$$ and a $$6 \Omega$$ resistor. Calculate the total power supplied by the dry cell.
523200_d201446871e84fb0b97d17cc41516404.png
  • $$9\ W$$
  • $$72\ W$$
  • $$16\ W$$
  • $$2\ W$$
An air conditioner is rated 240 V, 1.5 kW. The air conditioner is switched on 8 hours each day. What is electrical energy consumed in 30 days?
  • 2.88 kWh
  • 360 kWh
  • 120 kWh
  • 240 kWh
Electrical power P is given by the expression  P = $$\dfrac{Q \times V}{t}$$. time. What does $$Q$$ and $$V$$ stand for?
  • Charge, energy
  • Current, voltage
  • Current, power
  • Charge, voltage
Two resistance are connected in series as shown in diagram. What is the current through the $$5\ ohm$$ resistance?
523763_e542d1a87fea48f09f19a9c689f4b009.png
  • $$2 A$$
  • $$3 A$$
  • $$4 A$$
  • $$5 A$$
Two resistance are connected in series as shown in diagram. What is the value of $$R$$?
523766_dbabba44388a4c1c98b103df3650aa26.png
  • $$4 \Omega$$
  • $$6 \Omega$$
  • $$5 \Omega$$
  • $$3 \Omega$$
When a number of resistances are connected in parallel then combined resistance is less than the smallest individual resistance.
  • True
  • False
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