Question # 1

The waves in which the particles of the medium have displacement along the direction of propagation of waves are called

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longitudinal waves

transverse waves

non-mechanical waves

none of them

The combined effect of resistance and reactance in a.c. circuit is called

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conductance

resistance

impedance

choke

With the increase of temperature viscosity

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Increase

Decrease

Remains same

Doubles

The current in LCR circuit will be maximum whenωis

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As large as possible

Equal to natural frequency of LCR system

The substances which break just after the elastic limit is reached, are known as

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brittle substances

ductile substances

plastic substances

elastic substances

The effect of applying a force on a moving body is to change

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its direction of motion only

its speed of motion only

both the direction and speed of motion

its inertia only

If 42 J heat is transferred to the system and the work done by the system is 32 J then what will be the change in internal energy

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0 J

2 J

5 J

10 J

The tidal energy is due to gravitational pull of :

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sun

moon

Mars

None of these

Selenium is:

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An insulator

A conductor

Insulator in the dark and becomes conductor when exposed to light

Conductor in the dark only

None of these

Unit of viscosity is:

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Kg m^-1sec^-1

N s m^-2

J s m^-3

All of these

When two objects come to common temperature, the body is said to be in:

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Static equilibrium

Dynamic equilibrium

Thermal equilibrium

None of these

An airplane flies 400 m from north and then files 300 m south and then flies 1200 m upwards then net displacement is

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1200 m

1300 m

1400 m

1500 m

The speed of efflux is equal to the velocity gained by the falling fluid under the action of gravity through a certain height is known as

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Equation of continuity

Bernoulli s equation

Torrucelli s Theorem

Venturi s relation

How many phone calls can be carried by single mode step index fibre

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25000

96000

14000

21000

The time taken by light for its passage from M to m and back is

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2c/d

d/2c

2d/c

d²/2c

A fly is sitting on the objective of a telescope pointed towards the moons what effect is impacted in a photograph of the moon taken through the telescope

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The entire field of vision is blocked

There is image of the fly on the photograph

There is no effect at all

There is the reduction in intensity of the image

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 h²

The stopping potential for a certain metal is 10 volt, the max. Energy of emitted electron is:

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10 J

100 J

1.6 × 10-18 J

1.6 × 10-19 J

The spacing between the parallel lines are served as

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slits

source of light

opaque lines

fringes

Spherical balls of radius 'r' are falling in a viscous fluid of viscosity 'η' with a velocity 'v'. The retarding viscous force acting on the spherical ball is

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Inversely proportional to both r and v

Directly proportional to both r and v

Directly proportional to r but inversely proportional to v

Inversely proportional to r but directly proportional to v

A Perpetual motion is that motion which is

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Temporary

Continuous

Forever

None of these

The relative velocity before and after the collision is

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V₁+ V₂= V'₂+ V'₂

V₁- V₂= V'₂- V'₁

V₁- V₂=-( V'₂- V'₁)

None of these

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