Question # 1

Adiabatic change occurs when the gas

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expands

compressed

expands or compressed

expands or compressed rapidly

The mass of the nucleus is always less than the total man of the protons and neutron that make up the nucleus. The difference of the two masses is called

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nuclear fission

nuclear fusion

man defect

radioactivity

The free electrons in metals:

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Are in random motion and their speed depends upon temperature

Move in particular direction

Move with speed of light

Move such that their speed does not depend on their temperature

None of these

The number of "Earth Stations" which transmit signals to satellites and receive signals fro them are

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3

24

126

200

Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called

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deuteron

deterium

protium

tritium

Watt x second is unit of:

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Force

Work

Power

None of these

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

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1.66 m

1.0 m

0.66 m

2.66 m

Work done in lower and bucket into the well is:

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Zero

Positive

Negative

None of these

Which are not the elementary particles?

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Photons

Leptons

Hadrons

Quarks

None of these

Eddy current is produced when:

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A metal is kept 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 circular coil

A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

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Increases

Decreases

Remain unchanged

Becomes infinite

To observe the phenomenon of interference of light, the light should be

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Monochromatic

Phase coherence

Coherent sources

All of these

Light has:

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Wave nature

Particle nature

Dual nature

None of them

The speed at which light travels within the material depends upon

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Refractive index of medium

Wavelength

Frequency

Intensity

When V₁ is approximately zero then Bernoulli's equation reduces to

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Torricelli's theorem

Venturi relation

Equation of continuity

None of these

Two forces of 6 N and 8 N can produce a resultant of

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0 N

1 N

10 N

18 N

The cars usually have cylinders on the crankshaft are

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2

3

4

6

The product of force and time of impact force is called

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Momentum

Impulsive force

Impulse

Rate of change of momentum

The displacement-time graph of a particle is as shown below.It indicates that

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The particle starts with a certain velocity,but the motion is retarded and finally the particle stops

The velocity of the particle is constant throughout

The acceleration of the particle is constant throughout

The particle starts with a velocity the motion is accelerated and finally the particle moves with a constant velocity

A Gaussian surface is always an imaginary

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Open surface

Closed surface

Both

None of these

The amorphous material (solids) have

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No structure

No melting point

No definite shape

All of them

Propagation of light in an optical fiber requires that light should be

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Refracted from air to fiber

Continuously refraction

Totally reflected within the fiber

Both B and C

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