Question # 1

To make an LED, it is impreacticable to use:

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Silicon

Gallium arsenide

Gallium arsenide phosphide

Iron

Both (B) and (C)

The first super conductor was discovered in

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1811

1890

1901

1911

Good absorbers of heat are

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Poor emitters

Non emitters

Good emitters

Highly polarized

The minimum charge on any object can not be less than

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1.6 x 10^-19C

3.2 x 10^-19C

1.0 C

4.8 x 10^-19C

In the forward biases situation, the current flowing across the p-n junction is a few:

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amperes

Milli amperes

Micro amperes

Pico amperes

None of these

Wave disturbances may also come in a concentrated bundle, like shock wave from an aeroplane flying at

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subsonic speed

sonic speed

super sonic speed

any one of them

Radio telescope is used to gather information from

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Earth

Moon only

Far side of the universe

Sea water

'K' is the proportionality constant of force experienced by conductor. What is the value of 'K' in SI units?

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0

1

0.5

-1

If we plot graph between potential difference (V) and current (I) obeying ohm's law, it will give us

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parabola

straight line

hyper bola

ellipse

If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be

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0.1 watt

1 watt

10 watt

100 watt

The unit of decay constant is

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sex

sec²

sec^-1

sec^-2

A boat of mass 40 kg os at rest.A dog of mass 4 kg moves in the boat with a velocity of 10 m/s.What is the velocity of boat?

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4 m/s

2 m/s

8 m/s

1 m/s

Kilowatt-hour is a unit of

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Power

Energy

Electrical Energy

None of these

Indicate the force / forces which obeys inverse square law

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Strong Nuclear force

Gravitational force

Coulomb's force

b and c

Which one of the following can act approximately as a source of monochromatic light

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Neon lamp

Fluorescent tube

Sodium lamp

none of these

For fast moving particles, such as atomic particles in an accelerator, the following branch of physics is applicable

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newtonian mechanics

classical mechanics

relativistic mechanics

all of them

In the doping process, the ratio of the doping atoms to the semi-conductor atom is

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1 to 10

1 to 10³

1 to 10⁶

1 to 10⁹

The methods used for the conversion of biomass into fuels are

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Fermentation

Direct combustion

Direct sunlight

a & b

The SI unit of stress is same as that of.

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Momentum

Pressure

Force

Length

If the water exists from the pipe at the rate 1.5 kgs^-1 at speed of 0.3 ms^-1. If the water strikes a wall normally, find the force on the wall is

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5.53 N

5.03 N

1.35 N

0.45 N

A body of mass 'm' is moved to a height 'h' equal to the radius of the earth.The increase in potential energy is

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2 mgR

mgR

1/2 mgR

1/4 mgR

Find the change in internal energy when heat transferred to the system is 42 J

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15 J

10 J

5 J

2.5 J

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