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

Power dissipated across the 8Ω resistor in the circuit shown here is 2W. The power dissipated in watt units across the 3Ω resistor is
1269541_7077b965f1404c4989b36fe4a239a155.png
  • 2
  • 1
  • 0.5
  • 3
Equivalent resistance between A and B is 
1290211_cefbd30a479348779624a992be14f62a.png
  • 3Ω
  • 6Ω
  • 1.5Ω
  • 4.5Ω
The equivalent resistance of fig shown between 'a' and 'b' is
1272365_84833921f2a748f487c09193d47a732d.png
  • 2r8
  • 5r8
  • r8
  • 3r8
The resistance across A and B is
1288848_054a7f7d1ddf4438b6969733a4a98e55.png
  • R2
  • R
  • 6R5
  • 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
  • Ra4π2(2πa)
  • R2π(2πa)
  • R(2πa)
  • 4πRa(2πa)

When two resistors are connected in parallel, then the equivalent resistance is 

  • R1+R2
  • 1R1+1R2
  • R1×R2R1+R2
  • R1R2
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
  • Rn
  • nR2
  • Rn2
A conductor of resistance 3Ω 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 Ω
  • 92
  • 83
  • 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 120Ω. The power is
  • 400W
  • 200W
  • 480W
  • 240W
What is the minimum resistance which can be made using five resistors each of 15Ω?
  • 15Ω
  • 125Ω
  • 110Ω
  • 150Ω
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 R1 of the circuit shown in the figure if the resistances are equal to R1=10Ω,R2=20Ω and R3=30Ω and the potential of points 1,2 and 3 are equal to φ2=6V,andφ3 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 3Ω,4Ω and 5 Ω 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 600W240V is connected to 220 V mains. Its resistance is

  • 96Ω
  • 84Ω
  • 90Ω
  • 64Ω
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
  • 10Ω
  • 5Ω
  • 103Ω
  • 2Ω
If 5 resistors of 2.5Ω each are connected in parallel then what would be its resultant resistance?
  • 5Ω
  • 0.5Ω
  • 50Ω
  • 6.25Ω
If five equal pieces of 25 Ω are connected in parallel, then their equivalent resistance will be _____
  • 25Ω
  • 1Ω
  • 5Ω
  • 15Ω
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?
  • 100W
  • 200W
  • More than 100W
  • None of these
A wire has resistance 12Ω. It is bent in the form of a circle. The effective resistance between the two points on any diameter of the circle is?
  • 12Ω
  • 24Ω
  • 6Ω
  • 3Ω
Three 2Ω resistors are connected to form a triangle. The resistance between any two corners is?
  • 6Ω
  • 2Ω
  • 34Ω
  • 43Ω
In the circuit shown, the current in 3Ω resistance is?
1704589_e6231362a9da4753bc6e9512e9a54158.png
  • 1A
  • 1/7A
  • 5/7A
  • 15/7A
The power consumed by 4V battery in the circuit as shown is?
1704921_ca0ad257d42347fd95fc4f6694caf70e.png
  • 8W
  • 7W
  • 6W
  • 5W
An electrical conductor has a resistance of 5.6kΩ. 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?
  • 6.0×1020
  • 1.0×1019
  • 6.0×1017
  • 1.0×1016
Choose the correct option:
Three bulbs of 100 W, 200 W and 40 W are connected in series to the main supply of 200V. The current will be?
  • Maximum through 100W
  • Maximum through 200W
  • Maximum through 40W
  • Same in all
If two identical heaters each rated as (1000W-220V) are connected in parallel to 220V, then the total power consumed is?
  • 200W
  • 2500W
  • 250W
  • 2000W
The ratio R2/R3 is
  • (k1)2k
  • k21k
  • kk1
  • k1k2
The equivalent resistance between A and B ( of the circuit as shown ) is 
1753914_23d60febf4f14dc1b1bcc5bae8d53629.png
  • 4.5Ω
  • 12Ω
  • 5.4Ω
  • 20Ω
The equivalent resistance between A and B in the network in figure is 
1753700_de8ebc5e73174f95a578f35e85763bba.png
  • 43Ω
  • 32Ω
  • 3Ω
  • 2Ω
In the network shown, each resistance is equal to R. The equivalent
resistance between diagonally opposite corners is:


41581_0ea02188a8d643f5ab968d403c21825e.png
  • R
  • R3
  • 2R3
  • 4R3
The ratio R1/R2 is
  • k21k
  • kk1
  • k1k2
  • (k1)2k
In Fig. when an ideal voltmeter is connected across 4000Ω resistance, it reads 30 V. If the voltmeter is connected across 3000Ω resistance, it will read
1753591_a820e82486bd4197aa0bb45f1bada7fd.png
  • 20V
  • 22.5V
  • 35V
  • 40V
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 R1 and R2 having R1>R2 are connected in parallel. For equivalent resistance R , the correct statement is
  • R>R1+R2
  • R1<R<R2
  • R2<R<(R1+R2)
  • R<R1
0:0:3


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