Question # 1

If a wave can be polarized, it must be

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An electromagnetic wave

A longitudinal wave

A progressive wave

A transverse wave

Work done is maximum when angle between force and displacement is

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0°

90°

180°

None of these

The change of order of vectors in a dot product of two vectors:

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Changes its value

Doesn't change it's value

Changes the direction product quantity

None of these

The substance in which atoms are so oriented that the field produced by spin and orbital motion of the electrons might add up to zero,are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

Work is a Quantity

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Vector

Scalar

Non-physical

None of these

A second's pendulum is a pendulum whose time period is

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1 second

2 seconds

3 seconds

4 seconds

Which of the following is an example of a S.H.M?

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motion of a projectile

motion of a train along a circular path

motion of swing

electrons revolving sound the nucleus

If the volume of the gas is to be increased by 4 times, then

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Temperature and pressure must be doubled

At constant P the temperature must be increased by 4 times

At constant T the pressure must be increased by four times

It cannot be increased

A device which converts Electrical energy into mechanical energy is called as

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Transformer

Generator

Motor

All of these

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

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Germanium

Silicon

Arsenic

Gallium

Indium

When the object lies between F and 2F, the image formed by is formed at:

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Real

Virtual

Diminished

Erect

A force of 12 N gives an acceleration of 4 ms^-2 to an object.The force required to give it an acceleration of 10 ms^-2is

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15 N

20 N

25 N

30 N

Thermal radiations are a type of:

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Mechanical waves

Electromagnetic waves

Alpha rays

Electrons

A wire is stretched to double of its length.The strain is

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2

1

Zero

0.5

Frequency of red colour as compared to that of violet colour is:

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Equal

Smaller

Greater

None of these

Period of typical radio waves is

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1 × 10^-8 sec

1 × 10^-6 sec

1 × 10^-5 sec

Super conductors are the those materials whose resistivity becomes zero below certain temperature called

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Curie temperature

Fixed temperature

Critical temperature

None of these

In Newton,s rings apparatus, we also use

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Spectroscope

Telescope

Microscope

Turn table

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10^-15 m is

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9 x 10⁵ V

9 V

8 x 10⁶ V

80 V

The direction of the acceleration is the same as that of

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Displacement

Velocity

Both

None of these

Which of the following is dimensionally correct

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Pressure = energy per unit area

Pressure = energy per unit volume

Pressure = force per unit volume

Pressure = Momentum per unit volume per unit time

The correct unit of Kinematic viscosity in SI system is

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ra(D) s^-2

m².s^-1

g.s^-2

N .sm^-2

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