Question # 1

Identify the practical application of electrostatic force.

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Inkjet printer

x rays

Laser

A.C. Generator

Lorentz force means the force acting on a particle, which is

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Magnetic force only

Electric force only

Sum of electric and magnetic force

None of these

The direction of induced current is always so as to oppose the change which causes the current is:

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Faraday's law

Lenz's law

Ohm's law

Kirchhoff's 1st rule

Lenz's law is a consequence of the law of conservation of

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Charge

Momentum

Energy

Angular momentum

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

Natural rubber is an example of:

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Crystalline solids

Amorphous solids

Polymeric solids

None of above

If there is no fourth band, tolerance is shows as

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10%

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 critical temperature of mercury is.

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1.18 K

4.2 K

3.72 K

7.2 K

Charge on positron is:

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Negative

Positive

Netural

None of these

A transistor has:

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Two regions

Three regions

Single regions

Four regions

The total flux through a closed surface.

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Directly proportional to shape and geometry

Independent of medium

Depend on shape and geometry

Dependent on medium and the charge enclosed

The solid with definite M.L are called:

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Crystalline

Amorphous

Polymeric

None of above

The rest mass x ray photon is

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Infinite

Zero

1.67 X^-17 kg

All of the above

The winding of the electromagnet in motor are usually called.

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Magnetic coils

Field coils

Electric coils

electric o electric coils

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

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Chemical

Solar

Light

None of these

In gas the charge carriers are:

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Electrons

Ions

Both a & b

None of above

When a nucleus emits an alpha particle, its atomic mass decreases by

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1

2

3

4

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