Question # 1

According to Huygen's principle the points on primary wave front can be considered as

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Secondary wavelets

Ray of light

Source of light

None of these

If heat is added to a system, then its entropy will.

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Increases and positive

Decrease and positive

Increases but negative

Decreases but negative

The branch of Physics wich deals with velocities approaches the velocity of light is called

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Quantum Physics

Relati vistics Mechanics

Wave Mechanics

None of these

If velocity time graph is parallel to time axis, then acceleration of moving body will be.

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Maximum

Positive

Zero

Negative

Time period of simple pendulum depends upon

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Mass of pendulum

Weight of pendulum

Length of pendulum

Shape of pendulum

A man weight 1000 N in a stationary lift. If the lift moves up with an acceleration of 10 ms-2. then its weight becomes.

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1000 N

2000 N

3000 N

0 N

The mechanism of transports energy of all the waves is

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Different

Same

Complicated

Easy

The acceleration produced by elastic restoring force is

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Perpendicular to force

Opposite to force

In same direction as force

Zero

The efficiency of any heat engine can never be

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+ve

100%

-ve

None of these

A 2 meter of high tank is full of water. If a hole appears at its middle, then the speed of efflux is.

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4.4 ms-1

10 ms-1

6.2 ms-1

20 ms-1

The error in a certain measurement occurs due to

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Negligence of a person

In appropriate technique

Faulty Appraatus

All of rhe above

The distance between two consecutive trough is called.

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Displacement

Amplitude

Wave length

Wave front

If a stretched string 4 m long and it has 4 loops of stationary waves, then the wave length is.

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1m

2 m

3 m

4 m

The magnifying power of a convex lens of focal lendth 10 cm is

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7

9.6

11

3.5

Speed of sound in vacuum is

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280 ms-1

332 ms-1

333 ms-1

Zero ms-1

2 radian = ____

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2 m

4 m

57.3 m

114.6 m

10 waves pass through a point in 2 seconds with speed 10 ms-1 the frequency of wave will be

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1 Hz

2 Hz

5 Hz

10 Hz

The Idea that light is electromagnetic waves was indroduced by

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Maxwell Planck

Newton

Fermi

Crooks

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