Question # 1

From sand, we get a material used for construction of computer chips. That material is called:

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Germanium

Silicon

Copper

Lead

The smallest three dimensional basic structure is called as:

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An atom

Unit cell

Crystal lattice

Polymer

None of these

A 100 W, 200 V bulb is connected to a 160 volts supply. The actual power consumption would be

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64 W

80 W

100 W

125 W

Which of the following does not have the same units:

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Work

Heat

Kinetic energy

Power

The ratio of velocity of sound in air at 4 atm pressure and that at 1 atm pressure would be

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1 : 2

4 : 1

1 : 4

2 : 1

The nature of radiations emitted by a hot body depends upon its:

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Metarial

Temperature

colour

Volume

Length

Which of the following statements for an object in equilibrium is not true?

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The object must be at rest

The object can be at rest

The object is moving at constant speed

The acceleration of the object is zero

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

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Germanium

Silicon

Arsenic

Gallium

Indium

The characteristic of a body executing S.H.M is that its acceleration is

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inversely proportional to displacement

directly proportional to displacement

independent of displacement

equal to zero

The vector is space has:

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One Component

Two Compnents

Three Components

Non of these

Electric field strength is defined as

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Work done on unit charge

Force exerted on unit charge

Distance covered by unit charge

Power exerted by unit charge

None of these

If the cover of a red book is observed in monochromatic blue light,It will appear

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White

Red

Black

Blue

A completely transparent material will be invisible in vacuum when the refractive index n is

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Unity

More than unity

Less than unity

Equal to 1.33

If a body has zero acceleration, it means that it is

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At rest

Uniform velocity

Both

None of these

A radioactive nucleus can emit:

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Electron

𝛼 particles

Positron

Any of these

The information carrying capacity in an optical fibre is called

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wavelength

frequency

bandwidth

none of them

Temperature of a system is defined as

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Initial K.E. of its molecules

Instantaneous K.E. of its molecules

Average K.E. of its molecules

All of these

The Earth axis of rotation is

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Remains fixed

Remains fixed in one direction

Not fixed

None of these

The ratio of kinetic energy to potential energy for solids is

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A charge is placed at the centre of cube,the flux emitted through its one face is

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q/ε_∘

q/2ε_∘

q/6ε_∘

q/12ε_∘

The unpolarized light is

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An ordinary incandescent bulb

Sun

Moon

All of these

The waves propagate in space by the motion of the

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wavelengths

frequencies

wavefronts

none of them

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