CBSE Questions for Class 10 Physics Electricity Quiz 11 - MCQExams.com

Power dissipated across the $$8\Omega$$ resistor in the circuit shown here is $$2W$$. The power dissipated in watt units across the $$3\Omega$$ resistor is
1269541_7077b965f1404c4989b36fe4a239a155.png
  • $$2$$
  • $$1$$
  • $$0.5$$
  • $$3$$
Equivalent resistance between $$A$$ and $$B$$ is 
1290211_cefbd30a479348779624a992be14f62a.png
  • $$3 \Omega$$
  • $$6 \Omega$$
  • $$1.5 \Omega$$
  • $$4.5 \Omega$$
The equivalent resistance of fig shown between 'a' and 'b' is
1272365_84833921f2a748f487c09193d47a732d.png
  • $$\dfrac {2r} {8}$$
  • $$\dfrac {5r} {8}$$
  • $$\dfrac {r} {8}$$
  • $$\dfrac {3r} {8}$$
The resistance across A and B is
1288848_054a7f7d1ddf4438b6969733a4a98e55.png
  • $$\dfrac {R} {2}$$
  • $$R$$
  • $$\dfrac {6R} {5}$$
  • $$4R$$
Find a TRUE statement
  • Ohm's law is applicable to all conductors of electricity
  • The resistance of an incandescent lamp is lesser when the lamp is switched on
  • Specific resistance of a wire depends upon its dimensions
  • The resistance of carbon decreases with an increase in temperature
A wire of resistance 'R' is bent into a circular ring of radius r. Equivalent resistance between two points 'x' and 'y' on its circumference, when angle XOT is A, can be given by
1301744_5b19439f27964944a82908e2618319e0.PNG
  • $$\dfrac { Ra }{ { 4\pi }^{ 2 } } \left( 2\pi -a \right) $$
  • $$\dfrac { R }{ { 2\pi } } \left( 2\pi -a \right) $$
  • $$R\left( 2\pi -a \right) $$
  • $$\dfrac { 4\pi }{ { Ra } } \left( 2\pi -a \right) $$

When two resistors are connected in parallel, then the equivalent resistance is 
  • $${R_1} + {R_2}$$
  • $$\dfrac{1}{{{R_1}}} + \dfrac{1}{{{R_2}}}$$
  • $$\dfrac{{{R_1} \times {R_2}}}{{{R_1} + {R_2}}}$$
  • $$\dfrac{{{R_1}}}{{{R_2}}}$$
Potential difference across $$AB$$ shown in the figure is:
1309413_8da9f45245714500b821613c51428d7c.png
  • 10 V
  • 12 V
  • 8 V
  • 0 V
A wire of resistance R is cut into n equal parts these parts are then connected in parallel with each other. The equivalent resistance of the combination is :      
  • $$nR$$
  • $$\cfrac {R}{n}$$
  • $$\cfrac {n}{R^2}$$
  • $$\cfrac {R}{n^2}$$
A conductor of resistance $$3 \Omega$$ is stretched uniformly till its length is doubled. The wire is now bent in the form of an equilateral triangle. The effective resistance between the ends of any side of the triangle in $$\Omega$$
  • $$\dfrac{9}{2}$$
  • $$\dfrac{8}{3}$$
  • $$2$$
  • $$1$$
Electric current flows from the positive terminal of a battery to the negative terminal.
  • True
  • False
When resistors are connected in parallel, the current divides in the ...................
  • Direct ratio of resistances
  • Inverse ratio of resistances
  • Inverse ratio of the potential differences
  • None of these
In the circuit shown in the figure below, the magnitude and direction of the current will be  
1392285_a142598f84ee4749908aa0ca54bf251a.png
  • $$2.3 \ Amp$$ from A to B via E
  • $$2.3 \ Amp$$ from B to A via E
  • $$1.0 \ Amp$$ from B to A via E
  • $$1.0 \ Amp$$ from A to B via E
A toaster operating at $$240V$$ has a resistance of 120$$\Omega $$. The power is
  • $$400 W$$
  • $$200 W$$
  • $$480 W$$
  • $$240 W$$
What is the minimum resistance which can be made using five resistors each of $$\dfrac{1}{5} \Omega$$?
  • $$\dfrac{1}{5}\Omega$$
  • $$\dfrac{1}{25}\Omega$$
  • $$\dfrac{1}{10}\Omega$$
  • $$\dfrac{1}{50} \Omega$$
Inside a cell in a closed circuit the conventional electric current
  • always travels from - ve terminal to + ve terminal
  • always travels from + ve terminal to - ve terminal
  • may travel from +ve terminal to -ve terminal
  • may travel from -ve terminal to +ve terminal
Ashokbhai goes to an electric shop to buy an electric bulb to obtain light in a small room of his home. Which of the following statement is scientifically correct
  • Give bulb of $$60\ V$$
  • Give bulb of $$60\ J/s$$
  • Give bulb of $$60\ A$$
  • Give bulb of $$60\ W$$
Find the current flowing through the resistance $${ R }_{ 1 }$$ of the circuit shown in the figure if the resistances are equal to $${ R }_{ 1 }=10\Omega ,{ R }_{ 2 }=20\Omega $$ and $${ R }_{ 3 }=30\Omega $$ and the potential of points 1,2 and 3 are equal to $${ \varphi  }_{ 2 }=6V,and{ \varphi  }_{ 3 }$$ 5 V.
1468659_e6c10a328d8448fd82e6e29a76f93cd8.png
  • 0.1 A
  • 0.2 A
  • 0.3 A
  • 0.4 A
A uniform wire is cut into $$10$$ equal parts and all the equal parts are connected in parallel. The effective resistance
  • decreases $$10$$ times
  • increases $$10$$ times
  • increases $$100$$ times
  • decreases $$100$$ times
When three resistors of resistances $$  3 \Omega, 4 \Omega  $$ and 5 $$  \Omega  $$ are connected in parallel, the currents
through them are in the ratio
  • $$5:4:3$$
  • $$20:15:12$$
  • $$3:4:5$$
  • $$9:8:7$$
Inside a cell in a closed circuit the conventional electric current:
  • always travels from $$- ve$$ terminal to $$+ ve$$ terminal
  • always travels from $$+ ve$$ terminal to $$- ve$$ terminal
  • may travels from $$- ve$$ terminal to $$+ ve$$ terminal
  • may travels from $$+ ve$$ terminal to $$- ve$$ terminal
A lamp of $$  600 \mathrm{W}-240 \mathrm{V}  $$ is connected to 220 $$ \mathrm{V}  $$ mains. Its resistance is
  • $$

    96 \Omega

    $$
  • $$

    84 \Omega

    $$
  • $$

    90 \Omega

    $$
  • $$

    64 \Omega

    $$
Graphs between electric current and potential difference across two conductors A and B are shown in the figure. Which of the following conductor has more resistance?
1462948_cce2ce0fe65b44d59daea33e61158a57.PNG
  • B
  • A
  • Both have equal resistance
  • None of these
For the circuit shown in figure given below, the equivalent resistance between points A and B is
1516345_784e551e26c941d1a28742e38330a976.PNG
  • $$10\Omega$$
  • $$5\Omega$$
  • $$\dfrac{10}{3} \Omega$$
  • $$2\Omega$$
If $$5$$ resistors of $$2.5 \Omega$$ each are connected in parallel then what would be its resultant resistance?
  • $$5\Omega$$
  • $$0.5\Omega$$
  • $$50\Omega$$
  • $$6.25\Omega$$
If five equal pieces of $$25\ \Omega$$ are connected in parallel, then their equivalent resistance will be _____
  • $$25\Omega$$
  • $$1\Omega$$
  • $$5\Omega$$
  • $$\cfrac{1}{5}\Omega$$
Three resistances are arranged as shown. The potential of the point O is :
1525937_191ad18bb0954099820ea1f038888db7.png
  • 3 V
  • 1 V
  • 4 V
  • 5 V
Which unit is not used in either the definition of the coulomb or the definition of the volt?
  • ampere
  • joule
  • ohm
  • second
A $$220 \ V$$ and $$100 \ W$$ lamp is connected to $$220 \ V$$ power supply. What is the power consumed?
  • $$100$$W
  • $$200$$W
  • More than $$100$$W
  • None of these
A wire has resistance $$12\Omega$$. It is bent in the form of a circle. The effective resistance between the two points on any diameter of the circle is?
  • $$12\Omega$$
  • $$24\Omega$$
  • $$6\Omega$$
  • $$3\Omega$$
Three $$2\Omega$$ resistors are connected to form a triangle. The resistance between any two corners is?
  • $$6\Omega$$
  • $$2\Omega$$
  • $$\dfrac{3}{4}\Omega$$
  • $$\dfrac{4}{3}\Omega$$
In the circuit shown, the current in $$3\Omega$$ resistance is?
1704589_e6231362a9da4753bc6e9512e9a54158.png
  • $$1$$A
  • $$1/7$$A
  • $$5/7$$A
  • $$15/7$$A
The power consumed by $$4$$V battery in the circuit as shown is?
1704921_ca0ad257d42347fd95fc4f6694caf70e.png
  • $$8$$W
  • $$7$$W
  • $$6$$W
  • $$5$$W
An electrical conductor has a resistance of $$5.6k\Omega$$. A potential difference (p.d.) of $$9.0V$$ is applied
across its ends.
How many electrons pass a point in the conductor in one minute?
  • $$6.0\times 10^{20}$$
  • $$1.0\times 10^{19}$$
  • $$6.0\times 10^{17}$$
  • $$1.0\times 10^{16}$$
Choose the correct option:
Three bulbs of $$100 \ W$$, $$200 \ W$$ and $$40 \ W$$ are connected in series to the main supply of $$200$$V. The current will be?
  • Maximum through $$100$$W
  • Maximum through $$200$$W
  • Maximum through $$40$$W
  • Same in all
If two identical heaters each rated as ($$1000$$W-$$220$$V) are connected in parallel to $$220$$V, then the total power consumed is?
  • $$200$$W
  • $$2500$$W
  • $$250$$W
  • $$2000$$W
The ratio $$R_{2}/R_{3}$$ is
  • $$\dfrac{(k-1)^{2}}{k}$$
  • $$k^{2}-\dfrac{1}{k}$$
  • $$\dfrac{k}{k-1}$$
  • $$k-\dfrac{1}{k^{2}}$$
The equivalent resistance between $$A$$ and $$B$$ ( of the circuit as shown ) is 
1753914_23d60febf4f14dc1b1bcc5bae8d53629.png
  • $$4.5\Omega$$
  • $$12\Omega$$
  • $$5.4\Omega$$
  • $$20\Omega$$
The equivalent resistance between $$A$$ and $$B$$ in the network in figure is 
1753700_de8ebc5e73174f95a578f35e85763bba.png
  • $$\dfrac{4}{3}\Omega$$
  • $$\dfrac{3}{2}\Omega$$
  • $$3\Omega$$
  • $$2\Omega$$
In the network shown, each resistance is equal to R. The equivalent
resistance between diagonally opposite corners is:


41581_0ea02188a8d643f5ab968d403c21825e.png
  • R
  • $$\frac{R}{3}$$
  • $$\frac{2R}{3}$$
  • $$\frac{4R}{3}$$
The ratio $$R_{1}/R_{2}$$ is
  • $$k^{2}-\dfrac{1}{k}$$
  • $$\dfrac{k}{k-1}$$
  • $$k-\dfrac{1}{k^{2}}$$
  • $$\dfrac{(k-1)^{2}}{k}$$
In Fig. when an ideal voltmeter is connected across 4000$$\Omega $$ resistance, it reads 30 V. If the voltmeter is connected across 3000$$\Omega $$ resistance, it will read
1753591_a820e82486bd4197aa0bb45f1bada7fd.png
  • $$20 V$$
  • $$22.5 V$$
  • $$35 V$$
  • $$40 V$$
A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if
  • both the length and the radius of the wire are halved
  • both the length and the radius of the wire are doubled
  • the radius of the wire is doubled
  • the length of the wire is doubled
The equivalent resistance in series combination is :
  • smaller than the largest resistance.
  • larger than the largest resistance
  • smaller than the smallest resistance
  • larger than the smallest resistance.
An Insulator like wood and rubber has a very low electrical resistance. 
  • True
  • False
Write true or false for the following statements :
The resistance of a piece of rubber is more than that of piece copper.  
  • True
  • False
Write true or false for the following statements :
Heat dissipated by a conductor when a current is passed through it is directly proportional to the resistance of the conductor. 
  • True
  • False
Variation of current and voltage in a conductor has been shown in the diagram below. The resistance of the conductor is.
1815238_563018952aa3455b97e8809d2c6e877d.png
  • $$4$$ ohm
  • $$2$$ ohm
  • $$3$$ ohm
  • $$1$$ ohm
Two wires of the same material are given. The first wire is twice as long as the second and has twice the diameter of the second. The resistance of the first will be.
  • Twice of the second
  • Half of the second
  • Equal of the second
  • Four times of the second
Two resistors of resistance $$R_{1}$$ and $$R_{2}$$ having $$R_{1} > R_{2}$$ are connected in parallel. For equivalent resistance $$R$$ , the correct statement is
  • $$R > R_{1}+R_{2}$$
  • $$R_{1} < R < R_{2}$$
  • $$R_{2} < R < (R_{1}+R_{2})$$
  • $$R < R_{1}$$
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 10 Physics Quiz Questions and Answers