Question # 1

The range of wavelengths of colurs in the visible colours is

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140 nm to 456 nm

10 nm to 56 nm

410 nm to 656 nm

910 nm to 956 nm

None of these

The SI unit of flux density is

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Newton/Amp-meter

Newton-m/Ampere

Newton-m/Amp²

Newton-Amp/meter

Which of the following does not obey ohm's law?

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Copper

Al

Diode

None

Which instrument is expensive and difficult to use?

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Voltmeter

Potentiometer

CRO

Both A and C

Both A and B

Semi-conductor elements have atoms with

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2 valence electrons

3 valence electrons

4 valence electrons

5 valence electrons

The resistance of 20 cm long wire is 10Ω. When the length is changed to 40 cm. The new resistance is

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10Ω

20Ω

30Ω

40Ω

Which is modified form of galvanometer

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potentiometer

battery

voltmeter

slide wire bridge

Due to relative motion of observer and the frame of reference of events, time always:

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Dilates itself

Contracts itself

Stretches itself

Both (A) and (C)

None of these

At constant volume temperature is increased. Then

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Collision on walls will be less

Number of collisions per unit time will increase

Collision will be in straight lines

Collision will not change

At what temperature the adiabatic change is equivalent to the isothermal change?

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Zero degree Celsius

Zero Kelvin

Critical temperature

Above critical temperature

If an iron ball and a wooden ball of the same radius was released from a height 'h' in vacuum, then time taken by both of them to reach ground will be

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Unequal

Exactly equal

Roughly equal

Zero

Kilowatt-hour is a unit of

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Power

Energy

Electrical Energy

None of these

If a source of light is moving away from stationary observer then frequency of light wave appears to change because of

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Doppler's effect

Interference

Diffraction

None of the above

A constant volume gas thermometer is more sensitive than liquid thermometer because

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Gas expand more than liquid

Gases are easily obtained

Gases are much lighter

Gases do not easily change their state

Wavelength of red color as compared to that of violet color is

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Smaller

Longer

Equal

None of these

What is the weight of a 700 g of body on a planet whose mass is 1/7th of that of earth and radius is 1/2 of earth?

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400 gf

300 gf

700 gf

500 gf

The field in which the work done be independent of the path followed is called

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Conservative fields

Non-conservative field

Varying intensity field

None of these

Sunlight is also partially polarized because of Earth's atmosphere due to scattering by

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Water vapours

Air particles

Dust particles

All of these

Phenomenon of interference and diffraction support the:

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Quantum nature of light

Tranverse nature of light

Wave nature of light

Complex nature of light

The spacing between the parallel lines are served as

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slits

source of light

opaque lines

fringes

Selenium is an insulating material when exposed to

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Light

Dark

Monochromatic light

None of these

The state of rest and state of motion are

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Irrelevant

Relative

Both

None of these

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