Question # 1

When the pn-junction is in reversed biased, current flows through the junction due to the

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majority carriers

minority carriers

either of them

none of them

According to slok's law, drag force depends on

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Radius of the spherical body

Terminal velocity of body

Coefficient of viscosity

All of above

For the working of a heat engine, there must be

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a source of heat at high temperature

a sink at low temperature

both of them

none of them

In a container having water filled up to a height h, a hole is made in the bottom. The velocity of water flowing out of the hole is

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Independent of h

Proportional to h^1/2

Proportional to h

Proportional to h²

The value of current at resonance in series LCR circuit is affected by the value

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R only

C only

L only

R, C and L

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

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

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0°

30°

60°

90°

The expression for restoring force is

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F=ma

F=kx

F= -kx

Kx=ma

A body moving along the circumference of a circle of radius R completes one revolution. The radius of the covered path to the angle subtended at the center is:

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Radius of the circle

Twice the radius

Thrice the radius

None of these

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

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Max plank

Newton

Einstein

J.J. Thomson

A swing has

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one natural frequency

two natural frequencies

three natural frequencies

four natural frequencies

The capacity of a condenser when a dielectric is placed in between its plates

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Increases

Decreases

Doest not change

When refractive index of core is 1.50 and of 1.48 of cadding then find the angle of entry for an optical fibre is

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11.2^o

14.2^o

15.4^o

13.6^o

G.P Thomson revealed:

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Particle nature of electron

Dual nature of electron

Wave nature of electron

Electromagnetic nature of electron

When the torque acting on a system is zero, which of the following will be constant

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linear momentum

angular momentum

impulse

force

The original source of Wind energy is

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Tides

Waves

Sun

Moon

A unit vector is defined as

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Whose magnitude is one

Show the given direction

Opposite direction

a and b

Which device converts the light signals which these amplified and decoded

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Photo cell

Photo diode

Photo transistor

None of these

According to Huygen's principle:

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Light travel in straight line

Light is a transvers wave

Light has dual nature

All point on the primary wavefront are the sources of secondary wavelets

Bernoulli s equation applicable in the case of

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Streamlined flow of compressible fluids

Streamlined flow of incompressible fluids

Turbulent flow of compressible fluids

In the formula for velocity of efflux v = √2gh, h is the

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Height of liquid column from bottom of vessel

Height of orifice from the bottom of the vessel

Height of liquid column above the orifice

Height of the vessel

The vector sum of three vectors gives a zero resultant. What can be the orientations

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90^o

60^o

120^o

180^o

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