Question # 1

The ratio of potential barriers of Ge to Si at room temperatrue is.

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7:3

1:3

2:5

3:7

For electromagnetic waves, Maxwell generalized

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Gauses law for magnetism

Gauses law for eletricity

Fradays law

Amperes law

Maximum Compton shift is observed at.

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30^oC

90^oC

45^oC

180^oC

The current flowing through each resistor of equal resistance in parallel combination is.

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Same

Different

Zero

Infinite

Eddy current is produced when:

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A metal is light in varying magnetic field

A metal is kept in steady magnetic field

A circular coil is placed in a steady magnetic field

A current is passed through a circualr coil

The dimensions of Plank's constant is same as that of.

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Energy

Power

Acceleration

Angular momentum

Two opposite point charge of same magnitude separated by distance 2d, electric potential mid way between them is.

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1 V

2 V

Zero

V/2

Energy needed to produce an electron hole in solid state detector is.

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1 to 2 eV

3 to 4 eV

6 to 7 eV

8 to 9 eV

Force per unit charge is called:

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Gravitational force

Electric field intensity

Coulomb's force

None of these

For accurate measurement of current through a circuit, the resistance of ammeter should be

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Very small

Very high

Neither small nor high

None of the above

Two parallel wires carrying currents in the opposite direction.

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Repel each other

Attract each other

Have no effect upon each other

They cancel out their individual magnetic fields.

Cosmic rays consist of

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Protons

High energy photons

Positron

All of above

The e/m of a neutron is

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Less than electron

The same as electron

Zero

Greater than election

SI unit of reactance is.

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Ohm

Mho

Farad

Henry

A certain wire has a resistance R, the resistivity of an other wire of an identical material with the first, except for twice its diameter is.

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1/4 R

4R

2R

Same as R

The electric field created by positive charge is

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Radially inward

Zero

Circular

Radially outward

Shear modulus is expressed as:

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G = tanθ/F/A

F/A/tanθ

F/tanθ

tanθ/A

Which of the following has least hysteresis loop area.

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Steel

Wrought Iron

Soft Iron

Cobalt

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