Question # 1

The speed of sound in air does not depend upon

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Temperature

Pressure

Density

Medium

The dot product of two vectors A and B will be zero, if angle between A and B is

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Zero

30^o

90^o

180^o

Diffraction is a special type of

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Reflection

Polarization

Interference

Refraction

If the time period of simple pendulum is 2 seconds its frequency will be.

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1 Hz

0.5 Hz

1.5 Hz

2 Hz

The magnifying power of an astronomical telescope is 10. If the focal length of objective is 100 cm, then what is the focal length of eye piece.

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10 cm

100 cm

1000 cm

5 cm

Light entering rom air glass does not change in its.

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Frequency

Wavelength

Velocity

Direction

The direction of angular velocity is determined.

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Left hands rule

Head to tail rule

Right hand rule

General rule

The path followed by a projectile in known as its

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Range

Trajectory

Cycle

Height

The unit o pressure of gas is

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Nm^-2

Pascal

Atmosphere

All of these

The curve representing an adiabatic process is called.

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An adiabatic

An isotherm

Both of these

None of these

Sound waves are

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Electromagnetic waves

Transverse waves

Compressional waves

Matter waves

When sound waves enter in different medium, the quantity that remains unchanged is.

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Intensity

Speed

Frequency

Wave length

The SI unit of flow rate are

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m-sec^-2

m³-sec^-1

m³-sec^-2

m-sec^-3

When the amplitude of a wave become double, its energy becomes

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One half

Two times

Three times

Four times

A ray of light shows the direction of propagation of light It is line which is.

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Normal to the wave front

Parallax to the wave front

Opposite to the wave front

Equal to the wave front

The centre of Newton's fringe is dark due to.

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Destructive interference

Diffraction

Constructive interference

Polarization

Maximum number of components of a vector may be

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Infinite

One

two

three

Identity the non conservative force among the following.

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Frictional force

Electrical force

Gravitational force

Elastic restoring force

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