Question # 1

Sound wave in air are

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Longitudinal waves

Transvers waves

Electromagnetic waves

Matter waves

A car is travelling with uniform acceleration the road has check posts every 100 m When the car passes one post , it has a speed of 10 m s-1 and when passes the next one its speed is 20 ms-1 What is the cars acceleration.

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0.67 m s-2

1.5 m s2

2.5 m s-2

6.0 m s-2

The unit Planck's constant is equivalent to that of.

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Energy

Force

Velocity

Angular momentum

A CE amplifier with by passed emitter resistor is an example of.

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Current series feedback

Voltage sires feed back

Current shunt feedback

Voltage shunt feed back

A thin layer of oil the surface of water looks coloured due to.

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Pillarization of light

Different elements present in the oil

Interference of light

Transmission of light

Why hydrogen atom does not emit x-rays.

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its size is very small

It contains only single electron

In it energy levels are for apart

In it energy levels are close to each other

The unit of intensity level is.

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Watt

Joule

Bel

Sabin

In a transistor which one is very thin.

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Collector

Emitter

Base

Depletion region

When a newton's right interference pattern a viewd from above by means of reflected light , the central spot is

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Multicoloured

Alternately white and black

Bright

Dark

A Fly is found to be sitting on a telescope when it is focused towards the moon What effect is expected on the photograph of the moon.

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Intensity remains unchanged

No effect

The complete field of view is blocked

Coloured image will be seen

Let at constant temperature the pressure of an ideal gas be doubled so that the new volume is.

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Doubled the original volume

Same as original volume

Reduced to half the original volume

Reduced to two times the original volume

Who wrote books on sound and music.

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Galileo

Alkundi

Alberuni

Ibn al Haithem

Which of the following is non renewable source of energy.

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Wind

Coal

Hydroelectric

Biomass

The moment of linear momentum is equal to

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Implies

Torque

Angular momentum

Couple

Which of the following is a non contacting device that intercepts and measures thermal radiation.

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Thermometer

Pyrometer

Voltmeter

Lactometer

The unit of electrochemical potential is.

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J mol-1

volt

J C-1

Mol J-1

In the experiment of production of X rays the anti cathode should be bombarded with.

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A particles

Beta particles

Electrons

Protons

In rectifiers silicon junction diodes are preferred to germanium type because.

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They are cheaper

They are durable

Their much lower reverse current makes them more efficient

Of their geometry

Two tuning forks have same natural frequency One of them is now loaded with wax. When both the forks are sounded together the will

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Produce interference

Produce vibrations

Remain in resonance

Produce beats

An example of continuous spectrum is.

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Black body radiation spectrum

Molecular spectra

Atomic spectra

All of the above

The energy equivalent of 1 kg of matter a

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10^-15 J

1 J

10¹²J

10¹⁷ J

The product of cross sectional area of the pipe and the fluid velocity at any point along the pipe is equal to.

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Zero

Flow rate

A constant

A varibale

Mosley's law establishes the x rays fluorescence's of target element with its.

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Atomic weight

Atomic number

Density

Lattice constant

A positive and a Negative charge are initially 4 cm apart When they are moved closer together so that they are now only 1 cm part the force between them is.

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4 times smaller than befor

4 times larger than before

8 times larger than before

16 times larger than before

A fixed pulley is emplyed to

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Do some work

Change the directionof force

Do more work with the same force but without using the pulling

Have mechanical advantage greater than 1

If volume of the gas doubled without changing its temperature the pressure of the gas is

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Reduced to half of original value

Not changed

Reduced to one fourth of original value

Doubled

The part of theory of relativity which deals with accelerated bodies is called.

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special theory of relativity

General theory of relativity

Lorentz's theory of relativity

Galilean theory of relativity

If a body a moving with constant acceleration the velocity time graph will be a

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zig zag

Straight line

Constant value

zero value

If we use two diodes and a centre tapped transformer we eill get

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Transistor

Amplifier

Half wave rectifier

Full wave rectifier

In vacuum all electromagnetic waves have the same.

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Frequency

Amplitude

Speed

Wavelength

Significant motion for the molecules of a monoatomic gas is.

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Rotatory

Vibratory

Translatory

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