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Online Tests
ECAT Physics Chapter 12 Electrostatics Online Test MCQs With Answers
Question # 1
A heater coil rated at (1000 W - 200 V) is connected to 110 volt line. What will be the power consumed?
Choose an answer
200 W
302.5
250 W
350 W
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Question # 2
The charge per unit time through any cross-section of a conductor is called
Choose an answer
capacitance
electric power
current
potential difference
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Question # 3
The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor is
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21 x 10
3
+
10%
23 x 10
1
+
10%
21 x 10
3
+
5%
12 x 10
3
+
5%
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Question # 4
Battery is charged in motor cars, which is based on
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Chemical effect
Magnetic effect
Electric effect
None
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Question # 5
The electric flux from a closed surface
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Is independent of the shape of the surface
Depends on the charge enclosed by the surface
Both a and b
None of the above
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Question # 6
Surface density of charge is defined as
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Charge per unit volume
Charge per unit length
Charge per unit area
Charge per unit mass
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Question # 7
At ordinary temperature, an increase in temperature increases the conductivity of
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Conductor
Semiconductor
Insulator
Alloy
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Question # 8
Equal charges are given to two spheres of different radii. The potential will
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Be more on the smaller sphere
Be more on the bigger sphere
Be equal on both the sphere
Depend on the nature of the material of the sphere
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Question # 9
In bringing an electron towards another electron, electrostatic potential energy of system
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Decreases
Increases
Remains uncharged
Becomes zero
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Question # 10
A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor
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Increases
Decreases
Remain unchanged
Becomes infinite
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Question # 11
A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance
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Increase k time
Decreases k times
Decreases 1/K times
Remains unchanged
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Question # 12
The SI unit of current is
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watt
coulomb
volt
ampere
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Question # 13
If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be
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0.1 watt
1 watt
10 watt
100 watt
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Question # 14
The resistance of 20 cm long wire is 10
Ω
. When the length is changed to 40 cm. The new resistance is
Choose an answer
10
Ω
20
Ω
30
Ω
40
Ω
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Question # 15
Some charge is being given to a conductor. Then its potential
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Is maximum at surface
Is maximum at centre
Is remain same throughout the conductor
Is maximum somewhere between surface and centre
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