Question # 1

A metal plate of thickness half the separation between the capacitor plates of capacitance C is inserted. The new capacitance is

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C

C/2

Zero

2C

A conducting wire is drawn to double its length. Final resistivity of the material will be

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Double of the original one

Half of the original one

One fourth of the original one

Same as original one

If a 40 watt light bulb burns for 2 hours. how much heat is generated

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288 x 10³J

288 x 10⁸J

288 x 10⁵J

288 x 10⁶J

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10^-15is

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9 x 10⁵V

9 V

8 x 10⁶V

80 V

Specific resistance of a wire depends upon

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Length

Cross-section area

Mass

None

In a charged capacitor the energy is stored in

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Both in positive and negative charges

Positive charges

The edges of the capacitor plates

The electric field between the plates

The current through a metallic conductor is due to the motion of

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protons

neutrons

electrons

free electrons

One electron volt is equal to

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1.6 x 1019eV

6.25 x 1018 eV

1.6 x 1018 eV

6.25 x 1019eV

The value of electrical constant of proportionality k is

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9 x 10⁹Nm²C^-2

9 x 10^-9Nm²C^-2

9 x 10¹⁰Nm²C²

9.85 x 10^-12N^-1C^-2

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then

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The charge in the plates reduces and potential difference increase

Potential difference between the plates increase, stored energy decreases and charge remains the same

Potential difference between the plates decreases and charge remains unchanged

None of the above

The electric flux is linked with a surface will be maximum when

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The surface is held parallel to the electric field

The surface is held perpendicular to the electric field

The surface makes an angle of 45° with the electric field

All of the above

Three resistors of resistance 2,3 and 6 ohms are connected in parallel, their equivalent resistance is

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11.0 ohm

1.0 ohm

7.0 ohm

3.0 ohm

The minimum resistance that can be obtained by connecting 5 resistance of 1/4Ωeach is

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4/5Ω

5/4Ω

20Ω

0.05 Ω

The speed of randomly moving electrons depends upon

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pressure

volume

temperature

mass

The ratio of the gravitational force F_gto the electrostatic force F_ebetween two electrons at the same distance apart is approximately

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9.8

24 x 10¹⁹

24 x 10⁴²

24 x 10^-44

The potential difference across each resistance in series combination is

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same

different

zero

none of these

Ohm established a relation between

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voltage and resistance

voltage and charge

voltage and current

voltage resistance and charge

If we increase the distance between two plates of the capacitor, the capacitance will

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Increase

Decrease

Remain same

First increase then decrease

Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?

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3RΩ

2R/4Ω

R/3Ω

2R/3Ω

The energy stored in a charge capacitor

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1/2CV²

1/2C²V

1/2C/V²

None of these

If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy

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Ve

V/e

e/V

2Ve

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

One joule is equal to

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1.6 x 10¹⁹eV

6.25 x 10¹⁸eV

1.6 x 18¹⁸eV

6.25 x 10¹⁹eV

In RC series circuit the time during which the capacitor acquires 0.63 times the equilibrium charge is called

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Time constant

Decay constant

None of these

All of above

A charge of 0.1 c accelerated through a potential difference of 1000V acquires kinetic energy

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200 J

100 J

1000 J

400 J

A 10 F capacitor is charged to a potential difference of 50 V and is connected to another uncharged capacitor in parallel. Now the common potential difference becomes 20 volt.The capacitance of second capacitor is

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10μF

20μF

30μF

15μF

A (100 W , 200 W) bulb is connected to a 160 V power supply. The power consumption would be

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64 W

80 W

100 W

125 W

The unit of conductance is

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ohm

meter

mho

ohm-meter

Electric potential of earth is taken to be zero because the earth is good

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Semiconductor

Conductor

Insulator

Dielectric

The resistivity of a substance depends upon the

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length

mass

area

temperature

Which one of the following has larger value of relative permitivity E_rat room temperature?

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Vaccum

Air

Glass

Water

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