Question # 1

A potential barrier of 0.7 V exists across p-n junction made from:

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Germanium

Silicon

Arsenic

Gallium

Indium

The inside cavity of the black body is

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painted white

painted silver

blackened with soot

painted red

Which of the following options states the names of fluids in the order of increasing viscosity?

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mercury, motor oil, methanol

methanol, mercury, motor oil

motor oil, mercury, methanol

methanol, motor oil, mercury

Teh consumption of energy by a 1000 watt heater in half an hour is:

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5 Kwh

0.5 Kwh

2.5 Kwh

3.2 Kwh

Force is a:

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Scalar quantity

Base quantity

Derived quantity

None of these

The restoring force is _____ and opposite to the applied force within ______,:

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Equal, elastic limit

Different, the walls of the laboratory

Different, elastic limit

None of these

In RLC series circuit, resonance occurs when

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X_{L > Xc}

X_{L < Xc}

X_{L = Xc}

None of these

Which of the following is a state variable

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entropy

pressure

volume

all of them

Substances that flow easily have

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large coefficient of viscosity

small coefficient of viscosity

either of them

none of them

If two waves of length 50 cm and 51 cm produced 12 beats per second, the velocity of sound is

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360 m/s

306 m/s

331 m/s

340 ms

A body moves a distance of 10 m along a straight line under the action of a force of 5 N and work done is 25J. the angle which the force makes with the direction of motion will be:

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60°

90°

30°

0°

The critical temperature T for is

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1.6 K

2.71 K

3.72 K

2.82 K

The unit Compton wavelength is same as:

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Compton wavelength

Compton frequency

Compton shift

Both (a) & (b)

The fundamental frequency in a stretched string is 10 Hz. To double the frequency, the tension in it must be changed to:

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T₂ = 2T₁

T₂ = 4T₁

T₂ = T₁

none of these

1 torr = ______

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1.20 Nm^-2

1.38 Nm^-2

1.33 Nm^-2

1.31 Nm^-2

The typical speed of has working aunt is

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0.1 ms^-1

0.01 ms^-1

0.001 ms^-1

0.025 ms^-1

If the volume of a gas is to be increased four times then

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Its temperature must be doubled

At constant temperature its pressure must be decreased four times

At constant temperature its pressure must be increased two times

It cannot be increased

The re conversion of light signals into electrical signals takes place due to

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Transmitter

Receiver

Generator

None of these

Bulk modulus is involved when the deformation is

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One dimensional

Two dimensional

Three dimensional

All of these

While passing through the atmosphere, total energy is reduced by the dust particles, water vapours and other gases due to

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Reflection

Scattering

Absorption

All of these

Thermal radiations are a type of:

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Mechanical waves

Electromagnetic waves

Alpha rays

Electrons

Sun has elliptical shape when it rises and sets due to

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Refraction

Reflection

Scattering

Dispersion

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