Question # 1

The velocity given to a body to go out of the influence of earth's gravity is known as:

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Terminal velocity

Orbital velocity

Escape velocity

None of these

When a transistor is used as a switch the circuit in which the current is to be switched OFF and ON, is connected between the

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base and emitter

collector and emitter

base and collector

any one of these

Charge on proton is

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1.59 x 10^-9C

1.59 x 10^-7C

-1.59 x 10^-19C

1.59 x 10^-19C

One radian is equal to:

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30.3°

45.3°

50.3°

57.3°

Which of the following quantity for particle executing SHM is non-zero at mean position

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Force

Acceleration

Velocity

Displacement

The device which can convert heat energy into electrical energy is called:

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Thermistor

Thermometer

Thermostat

Thermocouple

Both (C) and (D)

Free oscillations are always produced by:

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An applied force

Gravitational force

Restoring force and inertia

Inertia only

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

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Stronger

Weaker

Much weaker

Absent

None of these

Consider a spherical shell of metal at he centre of which a positive point charge is kept

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The electric filed is zero outside the shell

The electric field is zero everywhere

The electric field is zero in the region inside the shell

The electric field is non-zero in both regions outside and inside the shell

The concept of entropy was introduced into the study of thermodynamics in

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1856

1865

1656

1685

The shortest distance between two points directed from its initial point to final point is called:

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Velocity

Displacement

Speed

Distance

At terminal velocity the net force acting on it is

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Maximum

Minimum

Zero

None of these

Shear modulus for steel is

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20

84

95

202

For all the irreversible processes the entropy of the system

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Increases

Decreases

Remains constant

None of these

If the instantaneous velocity of a body does not change, the body is said to be moving with

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average velocity

uniform velocity

instantaneous velocity

variable velocity

In coordinate axes, the left ward forces are taken as

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Positive

Negative

Just units only

None of these

The fluid which is incompressible and have streamline flow is called _________ fluid

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Ideal

Viscous

Non ideal

None of these

Stoke's law holds for bodies of the shape

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Spherical

Rectangular

Oblog

All of these

The typical speed of Earth around the sun is

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29700 ms^-1

29600 ms^-1

29500 ms^-1

29400 ms^-1

Glass and high carbon steel are

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Brittle substances

Insulator

Ductile substances

None of these

The disadvantage of the step-index fibre can be reduced by

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graded index fibre

non-graded index fibre

both of these

none of these

How the fringe spacing varies as the separation of the slits increases

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Increases

Decreases

Increases very little

None of these

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