Question # 1

An irreversible heat flow from a hot to cold substances of a system, causes the disorder to

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decrease

remains the same

increase

any one of them

Essential characteristic of equilibrium is

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Momentum equal to zero

Acceleration equal to zero

Kinetic energy equal to zero

Velocity equal to zero

The wave motion set up in any medium depends upon:

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Elasticity

Inertia

Density

All of these

In the study of thermodynamics, which gas is considered as the working substance

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real gas

ideal gas

any gas may be ideal or real

none of them

During the negative half-cycle of the half-wave rectification, the diode

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does not conduct

conducts

either of these

none of these

A choke coil is used as a resistance in

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d.c. circuit

a.c. circuit

d.c. potentiometer circuit

wheatstone bridge

In the theory of dimensional analysis, heat may be properly represented by:

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ML²T^-2

MT^-2

ML^-1T^-1

None of these

Which one is related to angular motion:

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Moment of a force

Moment of inertia

Moment of momentum

None of these

The SI unit of spring constant is identical with that of

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Force

Surface tension

Pressure

Loudness

The number if neutrons in the nucleus of ₉₂U²³⁵are

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Infinite

92

235

143

The charge carriers in gases are

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electrons

ions

protons

ions and electrons

Spectrometer can measure quite accurately prism

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Deviation of light by a glass prism

Angle of prism

Refractive index of the material of prism

None of these

In Huygen's wave theory the locus of all points in the same state of vibration is called

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A half-period zone

Vibrator

Wave front

A ray

Find the potential at a point, where a charge of 1 × 10^-3 coulomb is placed at a distance of 10 m is

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1 mV

1.9 KV

1.6 KV

.15 KV

According to the Huygen's principle, the secondary wavelets propagate in the forward direction with a speed equal to

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speed of wave motion

speed of medium

speed of electrons

speed of protons

Let a ray of light enters from air into two media of different refractive indices. The speed of light will be ______ to refractive index

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Directly proportional

Inversely proportional

Sometimes inversely

Equal

Two resistances 4Ω and 6Ω are in series they are in parallel with a 10Ω resistance.The equivalent resistance is

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5Ω

8Ω

12Ω

20Ω

When a plane polarized light is passed through certain crystals they

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Are totally absorbed

Are totally reflected

Rotate the plane of polarization

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

The SI units of displacement is

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m

kg

ms^-1

None of these

The drag force increase if the speed of the object moving through a fluid

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Increases

Decreases

remains constant

None of these

A unit vector is defined as

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Whose magnitude is one

Show the given direction

Opposite direction

a and b

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