Question # 1

A solar cell is made from:

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Iron

Silicon

Germanium

Copper

Physics deals with the study of

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Matter

Energy

Both of them

Human Body

The quantity F x t is called as

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momentum

velocity

acceleration

impulse

A reversible cycle is the one in which

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some of the changes are reversible

all of the changes are reversible

all of the changes are irreversible

none of them

The number of "Earth stations" which transmit signals to satellites and receive signals from them are:

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3

24

126

200

The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is

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10 KJ

5 KJ

2 KJ

1 KJ

In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:

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Short wavelength

Large wavelength

Very large wavelenth

Low frequency

Both (B) and (C)

The r.m.s. value of alternating current is equal to its maximum value at angle of

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60°

45°

30°

90°

The resistivity of a substance depends upon the

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length

mass

area

temperature

Fluids can transmit:

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Transverse wave

Compressional wave

Both of them

None of them

At any point on the right bisector of the line joining two equal and opposite charges

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At electric field is zero

The electric potential is zero

The electric potential decreases with increasing distance from the centre

The electric field is perpendicular to the line joining the charges

Compton studied the scattering of x-rays by loosely bound electrons from:

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NaCl crystal

Graphite crystal

Zirconia

Copper crystal

None of these

Which of the following pairs does not have identical dimensions?

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Torque and energy

Energy and work

Momentum and impulse

Mass and moment of inertia

If we connect a A.C. volt meter to read A.C. voltage, It would read its:

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RMS value

Instantaneous value

Valued average over a cycle

Zero

Both (B) and (C)

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

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60°

90°

30°

0°

The SI unit of strain is

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N

Dynes

Pascal

Dimensionless

Branch of physics which deals with the study of stars and galaxies is called:

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Solid state physics

Astrophysics

Molecular physics

Chemical physics

Above a certain velocity of a fluid is called

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turbulent flow

steady flow

either of them

both of them

Velocity of particle executing SHM will be maximum at

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Extreme position

Mean position

b/w mean and extreme

None

By CAT scans, we can detect the density difference of the order of:

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1%

20%

30%

50%

70%

Find the total displacement of a body in 8 seconds starting from rest with an acceleration of 20 cm/s²

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0.064 m

640 cm

64 cm

64 m

The wave nature of light was proposed by:

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Newton

Thomas Young

Huygen

None of these

The force acting as one meter length of the conductor placed at right angle to the magnetic field, when one A current is passing through it, defines the

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magnetic flux

magnetic induction

magnetic field

self inductance

An LED emits light when it is:

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Forward biased

Reverse biased

Operated without battery

Operated with heat source

None of these

It is impossible to devise a processes which may convert heat, extracted from a single reservoir, entirely into work without leaving any change in the working system. This is the statement of

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Clausius statement of second law

Kelvin'sstatement of second law

Clausius statement of first law

Kelvin's statement of first law

Which quantity has the same units as impulse

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force

work

linear momentum

acceleration

The space around the earth within it exerts a force of attraction on other bodies of known as:

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Nuclear field

Conservative field

Electric field

Gravitational field

In case of an ideal gas, the P.E associated with its molecule is

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maximum

zero

minimum

not fixed

Newton published laws of motion in his famous book "principia" in

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1867

1667

1676

1687

Work is a

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Scalar quantity

Vector quantity

Base quantity

None of these

The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called

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Diffraction

Interference

Polarization

Dispersion

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