Question # 1

LED is a p-n junction that emits

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Visible light

X- rays

Ultraviolet light

electromagnetic waves

Which quantity has different base units from the other three.

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Density x volume x velocity

Rate of change of momentum

The Young's modulus x area

Weight

Resistance and resistivity of a substance

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Increase with rise in temperature

Decrease with rise in temperature

Remains same at every temperature

Increases at high voltage

If the earth stopped rotating the weight of the object at the equator would.

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Be greater

Be same as before

Be less

Very with altitude

The diffraction of light was discovered by

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Newton

Young

Francesco Grimaldi

Hertz

When a positive charge is allowed to move from positive to negative plate, then it will gain

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P.E.

K.E

Gravitational energy

Electrical P.E.

The escape velocity from the earth's surface is

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1.2 km s-1

1.7 km s-1

10.2 km s-1

11.2 km s-1

What is zoom lens

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It is a lens having fixed focal length

It is a lens having variable focal length

It is a lens used in radii to telescope

All of the above

The internal energy of monoatomic gas is.

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3/2 RT

Independent of temperature

In the form of K.E.

Partially kinetic and partially potential

In a purely resistive circuit carrying A.C. current the.

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Current and voltage are always in phase

Current lags the voltage by 1/4 cycle

Voltage lags the current by 1/4 cycle

Current leads the voltage by 1/2 cycle

When an arrow is shot from a bow, it has K.E. which is given to it by

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The elongated tail

The stretched string of bow

The throw of archer

The sharp arrows head

When a hot liquid is mixed with a cold liquid temperature of the mixture.

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First decreases and then becomes constant

First increases and then becomes constant

Continuously decreaes

Is undefined for some time and then nearly becomes constant

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

X-rays can cause

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Malaria

Dysentery

Cancer

Blood pressure

In CC configuration voltage gain is.

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Less than one

More than one

One

Zero

when a body accelerates.

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Its direction always changes

Its mass always changes

Its velocity always changes

It falls towards the earth

The temperature scale based upon triple point of water was given by

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Rumford

Carnot

Kelvin

Celsius

A wave source of frequency 1,000 Hz emits waves of wavelength 0.1 m How long does it take for the waves to travel 2500 m.

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4 s

25 s

40 s

100 s

Abu abdullah ibn Jabir Al battani was the greatest

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Philospher

Mathematician

Astronomer

Palmist

Which quantity is common for systems in thermal equilibrium.

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Heat

Temperature

Momentum

Specific heat

Which one of the following is an example of a reversible process.

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Work done against friction

Heat produced by current

Melting of ice

See back effect

Liquids with disordered structure frozen in are an example of

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Amorphous solids

Glassy solids

Crystalline solids

Polymeric molecules

What is world's average surface air temperature.

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5 ^oC

10^oC

15 ^oC

20 ^oC

Who developed hypothetical heat engine that has the maximum possible efficiency in 1824

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Saadi carnot

August Otto

rudolf Diesel

Kari Benz

Which of the following is a set of supplementary units.

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Radian and steradian

Radian and mole

Steradian and candela

Radian and kelvin

The graph between restoring force and time in SHM is a

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Straight line

Parabola

Sine wave

Circle

The decimal equivalent of 1111 is

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5

10

15

120

Which law states that the angle of incidence equals the angle of refraction.

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Law of reflection

Law of refraction

Snell's law

Hygens's principle

Ultrasonic sound waves

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Can be heard by a normal human ear

Can be heard with the help of hearing apparatus

Can be heard with the help of microphone

cannot be heard

Thermocouple is used for

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Converting atomic energy into heat energy

Measure the radiant energy

Storing the heat energy

Measuring current

Ashes from a campfire deep in a cave show carbon -14 activity of only one eighth the activity of fresh wood. How long ago was that campfire made.

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13590 years

15190 years

17190 years

21190 years

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