Question # 1

Which one of the following phenomenon cannot be explained on the bases of Huygen's theory

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Refraction

Reflection

Diffraction

Formation of spectrum

In transverse waves, the individual particles of the medium move:

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In circles

Perpendicular to the direction of level

Parallel to the direction of level

None of these

A one microfarad capacitor of a TV is subjected to 4000 V potential difference. The energy stored in capacitor is

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8 J

16 J

4 x 10^-3J

2 x 10^-3J

If a vector lies in second quadrant, than B_xand B_yare:

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-,+

+,-

+,+

-,-

If the acceleration of a body is not uniform, then velocity-time graph will be:

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Curve

Straight line

Sphere

All of these

Two samples A and B of a gas initially of the same temperature and pressure are compressed from a volume V to a volume V/2 such that A is compressed isothermally and B adiabatically. The final pressure

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A greater than than of B

A is equal to that of B

A is less than that of B

A is twice the pressure of B

A typical four stroke petrol engine undergoes how many successive processes in each cycle

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one

two

three

four

At low speeds, the drag force is

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proportional to speed

inversely proportional to speed

not simply proportional to speed

none of them

Pair production is the phenomenon in which

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matter is converted into energy

energy is converted into matter

light is converted into electrical energy

electrical energy is converted into light

What is frequency of radio waves transmitted by a station, if the wavelength of those waves is 300 m?

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1 MHz

10 Hz

1 GHz

100000 Hz

The terms phase difference and path difference are:

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Same

Different

Equal

None of these

The relative velocity before and after the collision is

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V₁+ V₂= V'₂+ V'₂

V₁- V₂= V'₂- V'₁

V₁- V₂=-( V'₂- V'₁)

None of these

A person is standing on a rotating stool spreading his arms.He suddenly contracts his arms.His

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Angular momentum increases

Momentum of inertia increases

Momentum of inertia decreases

Angular momentum decreases

In photo phone modulated beam of reflected sun light focused on a detector several hundred meters away with the divice

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Germanium

Selinium

Silicon

None of these

Cladding in an optical fiber is used to

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Absorb unneccessary light

Produce total internal reflection

Transmit light

Filter light

Substances which donot easily flow have coefficient of viscosity as

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Small

Very small

Large

None of these

The smallest portion of a crystal lattice that if repeated in three-dimensions will generate the entire lattice is called:

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Unit cell

Lattice plane

Crystal

None of these

In Bernoulli's equation, the work done due to fluid is

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Find the average speed of oxygen molecule in the air at S.T.P

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591 ms^-1

461 ms^-1

396 ms^-1

372 ms^-1

A ball of mass m moving with uniform speed collides elastically with another stationary ball.The incident ball will lose maximum kinetic energy when mass of the stationary ball is:

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m

2 m

4 m

Infinity

Which of the given strains can also be written as tan θ

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Compressional strain

Volumetric strain

Shear strain

All of these

Two sources are said to be coherent if they have:

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Same amplitude

Same wavelength

Definite phase relation with each other

None of them

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