Question # 1

Least distance of distinct vision of an old man possibly becomes:

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A little less than 25 cm

A little more than 25 cm

Much less than 25 cm

None of these

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

Surface tension of water is reduced by adding

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Detergents

Camphor

Plastic

Both A and B

Which of the following waves are more energetic

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radio waves

infrared waves

ultraviolet

γ-rays

Shock absorber of the car is an example of

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resonance

forced oscillations

interference

damped oscillations

Ohm is the unit of

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current

capacitance

energy

resistance

Transmitting antenna emits

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Magnetic waves

Electric waves

Electromagnetic waves

Sound waves

The SI unit of conductivity is

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ohm-m

ohm^-1m^-1

ohm-m^-1

ohm^-1m

A body of mass 5 kg is acted upon by a constant force of 20 n for 7 seconds. The total change in momentum will be:

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10 NS

100 NS

140 NS

200 NS

Free oscillations are always produced by:

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An applied force

Gravitational force

Restoring force and inertia

Inertia only

The whole structure obtained by the repetition of unit cells is called:

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Crystal lattice

Amorphous solid

Polymeric solid

Polysterne

None of these

The motion of molecules in gases is:

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Orderly

Random

Circular

All of these

In frequency modulation (FM), the carrier waves amplitude

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Remains constant

Increase

Decreases

None of these

It is possible to recognize a person by hearing his voice even if he is hidden behind a solid wall. This is due to the fact that his voice

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Has a definite pitch

Has a definite quality

Has a definite capacity

Can penetrate the wall

With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are

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Energy, momentum and mass

Energy

Energy and mass

Energy and linear momentum

The number of different crystals systems based on the geometrical arrangement of their atoms and the resultant geometrical structure are

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5

7

9

14

Stars twinkle due to

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The fact that they do not emit light continuously

The refractive index of earth's atmosphere fluctuates

The Star's atmosphere absorbs its light intermittently

None of these

The body oscillates due to _____ accelerates and overshoots the rest position due to______,:

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Applied force, inertial

Restoring force, friction

Frictional force, inertial

Restoring force, inertial

When some compass needles are placed on a card board along a circle with the center at the wire, they will

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Point the direction of N-S

Set themselves tangential to the circle

Point in the direction of E-W

None of these

Point in direction of S-E

If time period of a pendulum is doubled by increasing its length, then its frequency will

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Also be doubled

Become half

Become one fourth

Becomes four times

At the present time, the main frontiers of fundamental science are

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2

3

4

5

Field lines are closer to each other in the region where the field is:

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Stronger

Weaker

Much weaker

Absent

None of these

Relativistic mechanics is a branch of physics, which deal with the bodies moving with velocities:

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More then c

Approaching c

Equal to c

Much less than x

Position was discovered by Carl Anderson in

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1920

1925

1928

1932

Choose the set of physical quantities, which have both numerical and directional properties:

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Velocity, mass

Speed, acceleration

acceleration weight

Distance, force

The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.

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Equal to

Greater than

Smaller than

None of these

The number of all the protons and neutrons in a nucleus is known as

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atomic number

mass number

charge number

none of these

A field in which the work done in moving a body along closed path is zero is called

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Nuclear Field

Conservative field

Gravitational field

Non-conservative field

For the virtual image, option _______ is not correct:

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1/p = 1/f -1/q

1/f = 1/p -1/q

1/p=1/p-1/f

1/p=1/f+1/q

When the emitter-base junction of a transistor is reverse biased, collector current

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Reverses

Increases

Decreases

Stops

The special theory of relativity is based on the

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one postulate

two postulates

three postulates

four postulates

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