Question # 1

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 potencial difference increase

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

Potencial difference between the plates decreases, stored energy decreases and charge remains unchanged

None of them

If the resistance of 500 Ohm have fourth band of silver colour then its upper maximum resistance will be.

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600 Ohm

550 Ohm

450 Ohm

400 Ohm

An inductor of 1 henry inductance has a reactance 500 ohms, then the frequency required is approximately

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50 Hz

100 Hz

80 Hz

120 Hz

To convert a galvanometer into a volt meter a high resistance is connected.

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In series

In parallel

In perpendicular

Along tangent

The slope of q-t curve at any instant of time gives.

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Voltage

Current

Charge

Botha a and b

If a charge body moved against the electric field it will again

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Potential energy

K.E

Mechanical Energy

Electric potential energy

Net charge enclosed by Gaussian surface is:

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zero

maximum

depend on intensity

none of all

Force per unit charge is called:

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Gravitational force

Electric field intensity

Coulomb's force

None of these

The electric field created by positive charge is

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Radially inward

Zero

Circular

Radially outward

e.m.f is the conversion of --------------- energy into electrical energy

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Chemical

Solar

Light

None of these

I amu =

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9.31 MeV

931 MeV

9.031 MeV

None of above

When Ohm meter gives full scale deflection it indicates.

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Zero resistance

Infinite resistance

Small resistance

Very High resistance

In gas the charge carriers are:

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Electrons

Ions

Both a & b

None of above

The p-n junction in which p side is connected to+ive and n-side is -ve the junction is said to be:

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Neutral

Forward biased

Reversed biased

None of above

There is regular arrangement of molecules in:

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Amorphous solids

Crystalline solids

Both a and b

None of above

If the separation between the plates of a capacitor is doubled then its capacitance become.

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Double

Half

One fourth

Three times

Output of D.C. motor is

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A.C. energy

Mechanical energy

Chemical energy

D.C. energy

When meta I is heated sufficiently electrons are given off by the metal. This phenomenon is known as.

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Photoelectric effect

Piezo electric effect

Thermionic emission

Secondary emission

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