Question # 1

A potential barrier of 0.7 V exists across p-n junction made from:

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Germanium

Silicon

Arsenic

Gallium

Indium

A spring of constant k = 0.4 N m^-1_{is to be extended thorugh 10 cm at a place where g = 10 m sec}^-2. The mass to be suspended should be:

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4 gms

0.4 gms

40 gms

None of these

The conductivity of a superconductor is

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Infinite

Very large

Very small

Zero

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

An aircraft is moving with a velocity of 300 ms^-1. If all the forces acting on it are balanced, then

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It still moves with the same velocity

It will be just floating at the same point in space

It will be fall down instantaneously

It will lose its velocity gradually

The direction of velocity is along the direction of

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distance

displacement

acceleration

all of them

Battery is charged in motor cars, which is based on

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Chemical effect

Magnetic effect

Electric effect

None

Light year is a unit of:

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Time

Distance

Velocity

Intensity of light

The branch of physics which deals with the properties of fundamental particles is called:

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High energy physics

Molecular physics

Astrophysics

Space physics

The capacitance of a parallel plate capacitor depends upon

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Area of the plates

Separation between the plates

Medium between the plates

All of the above

The value of the input resistance of OP-AMP is of the order of

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few ohms

few hundred ohms

several kilo ohms

several maga ohms

Which of the following colors suffers maximum deviation in a prism?

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Yellow

Blue

Green

Orange

Which phenomenon of light takes place in Young's double-slit experiment?

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polarization of light

diffraction of light

interference of light

reflection of light

The rotational analogue of power is given by

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τω

τv

F ω

τ/ω

When a droplet falls through a medium with terminal velocity the acceleration is

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Maximum

Minimum

Constant

Zero

1 joule is equal to electrons volt

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1.6 x 10^-19

1.6 x 10¹⁹

6.25 x 10¹⁹

6.25 x 10¹⁸

Equal charges are given to two spheres of different radii The potential will

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Be more on the smaller sphere

Be more on the bigger sphere

Be equal on both sphere

Depend on the nature of material of sphere

A visual representation of an electric field in terms of an electric field lines was proposed by

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Coulomb

Faraday

Gauss

Lenz

The electrons occupying the conduction band are known as

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conduction electrons

free electrons

both of them

none of them

The displacement coincides with the path of the motion when a body moves in a

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curved line

straight line

either straight or curved

none of them

If S is the stress and Y is Young's modulus of the material of a wire, the energy stored in the wire per unit volume is

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2 S²Y

S²/2Y

2Y/S²

S/2Y

The valence energy band may be either

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Completely filled

Partially filled

a and b

All of them

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