Question # 1

In wilson cloud chamber, the air becomes saturated with:

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Alcohol vapours

Water

Helium gas

Nitrogen gas

None of these

Acceleration produced in a body by a force varies

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inversely as the applied force

directly as the applied force

directly as the mass of the body

none of them

During the positive half-cycle in the half-wave rectification,the diode

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does not conduct

conducts

either of these

neither of these

Computer chips are made from:

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Iron

Silicon

Helium

Stontium

Aluminium

The induced current in the loop can be increased by:

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Using a strong magnetic field

Moving the loop faster

Replacing the loop by a coil of many turns

All of above

None of these

Rate of flow can be expressed in

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litre/sec

litre-sec

sec/litre

sec/litre-m

The materials in which valence electrons are bound very tightly to their atoms and are not free, are known as

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conductors

insulators

semi-conductors

all of them

The work is stored in the inductor as

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Electric potential energy

Elastic potential energy

Magnetic energy

Absolute potential energy

When the droplet moves with terminal velocity in a fluid, the net force acting on the droplet is:

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F_D-mg

Zero

mg-F_D

None of these

According to the special theory of relativity

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mass and energy are same entities

mass and energy are same entities but interconverible

mass and energy are different entities but interconverible

mass and energy are different entities but non-interconveritble

The electrons occupying the conduction band are known as

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conduction electrons

free electrons

both of them

none of them

A line which represents the direction of travel of a wave is known as:

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Spherical wavefront

Locus

Ray

Either B or C

Identify the pair whose dimensions are equal

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Torque and work

Stress and energy

Force and stress

Force and work

A device which convert DC into AC is calleD)

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Invertor

Generator

Rectifier

Motor

A constant volume gas thermometer is more sensitive than liquid thermometer because

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Gas expand more than liquid

Gases are easily obtained

Gases are much lighter

Gases do not easily change their state

According to Einsteins theory, gravity follows the inverse square law expect in

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Weak gravitational field

Strong gravitational field

Very very weak gravitational field

None of these

When an atom is isolated, it energy levels are

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Distinct

Very close

Very very close

None of these

A gas which strictly obeys the gas laws under all conditions of temperatures and pressure is called:

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Ideal gas

Inert gas

Real gas

None of these

Two bodies with kinetic energies in the ratio 4 : 1 are moving with equal linear momentum.The ratio of their masses is

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1 : 2

1 : 1

4 : 1

1 : 4

Which of the material have largest value of young's modulus

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Copper

Diamond

Aluminum

Iron

In Young s experiment the distance between two adjacent fringes for blue light is than that for green light

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Lesser

Greater

Equal

Lesser if distance between source and screen is large

When the fuel ignited it turns to a gas at

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Low pressure

High pressure

Extremely high pressure

None of these

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