Question # 1

If I_o is the peak value of current, then its root mean square value is given by

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2 I_o

I_o

0.7 I_o

Young's modulus for water's is

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Zero

1

2

3

A semiconductor in its extremely pure form is known as:

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Intrinsic

Extrinsic

Both a and b

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

If both the magnitude of charges and distance between them is doubled, then coulomb's force will be.

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Doubled

Hlaf

Remain same

One fourth

Application of wave like nature of particle is

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Photodiode

Optical microscope

Electron microscope

Compound microscope

If both the length and radius of the rod are doubled, then the modulus of elasticity will:

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Increase

Decrease

Remains the same

Doubled

A light emitting diode emits light only when

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Reverse biased

Forward biased

Unbiased

None of these

We can never accurately describes all aspects of sbatomic particles simulatanously. It is correct according to:

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Uncertainity Priciple

De-broglie Theory

Einstin Theory

Photo electric effect

The most common source of an A.C. Voltage is.

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Motor

Cell

Generator

Thermo couple

The north pole of a magnet is brought near a metallic ring. The direction of induced current in the ring will be:

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Antoclockwise

Clockwise

First Clockwise and then Antoclockwise

First anticlockwise and then Clockwise

Cobalt -60 is the source for

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Alpha rays

Gama rays

Beta rays

Neutron

A° is the unit of:

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Energy

Length

Nuclear energy

Work

The current induced can be increased by:

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Using a stronger magnetic field

Moving the loop faster

Replacing the loop bay coi of many turns

All of above

In RLC series circuit at resonance the phase difference between capacitor and inductor reactance is.

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90^o

270^o

0^o

180^o

The electric field lines are closer where the field is

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Strong

Weak

Uniform

Variable

Albert Einstein got noble prize in:

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1926

1921

1918

1931

Out of the following which material is brittle.

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Wrought iron

Copper

Tungsten

High steel carbon

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