# PHYSICS : REVISION TEST ON TOPICS OF CLASS XII ---XIII

If the dielectric constant and dielectric strength be denoted by K and X respectively, then a material suitable for use as a dielectric in a capacitor must have ____.
High K and high X
High K and low X
Low K and low X
Low K and high X
A parallel plate condenser is immersed in an oil of dielectric constant 2. The field between the plates is ____.
increased proportional to 2
Eight small drops, each of radius r and having same charge q are combined to form a big drop. The ratio between the potentials of the bigger drop and the smaller drop is ____.
8 : 1
4 : 1
2 : 1
1 : 8

5
1.25
4
2.5
The outer sphere of a spherical air capacitor is earthed. For increasing its capacitance ____.
vacuum is created between two spheres
dielectric material is filled between the two spheres
the space between two spheres is increased
the earthing of the outer sphere is removed
/
The energy of a charged capacitor resides in ____.
the electric field only
the magnetic field only
both the electric and magnetic field
Neither in electric nor magnetic field
A capacitor with air as the dielectric is charged to a potential of 100 volts. If the space between the plates is now filled with a dielectric of dielectric constant 10, the potential difference between the plates is ____.
1000
100 Volts
10 Volts
Zero
A parallel plate capacitor is charged and the charging battery is then disconnected. If the plates of the capacitor are moved further apart by means of insulating handles, then ____.
the charge on the capacitor increases
the voltage across the plates decreases
the capacitance increases
the electrostatic energy stored in the capacitor increases

it will remain stationary on the table
it is pulled by the capacitor and will pass on the other end
it is pulled between the plates and will remain there
All the above statements are false
Description:

TOPICS: ELECTROSTATICS: CAPACITORS

Discussion

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2404 days 18 hours 21 minutes ago

the test was good

3655 days 18 hours 13 minutes ago

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3811 days 22 hours 54 minutes ago

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3811 days 22 hours 54 minutes ago

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They r very useful

3828 days 12 hours 6 minutes ago

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3927 days 17 hours 38 minutes ago

a goood test

3949 days 3 hours 29 minutes ago

Kajal Sengupta
Physics 9th to 12 th grade,CIE, Edexcel, AP, IB , CBSE, ICSE
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