Question # 1

The velocity of sound at same temperature is maximum in

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H₂

N₂

O₂

NH₃

A coil of constant area is placed in a constant magnetic field. An induced current is produced in the coil when:

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The coil is distorted

The coil is rotated

The coil is neither distorted nor rotated

Both A and B

None of these

For production of beats the two sources must have

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Different frequencies and same amplitude

Different frequencies

Different frequencies, same amplitude and same phase

Different frequencies and same phase

The principle characteristics of an ideal standard are

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Inaccessible and Invariable

Accessible and Invariable

Accessible and Variable

None of these

The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called

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Diffraction

Interference

Polarization

Dispersion

A monkey sits on the pan of spring scale kept in an elevator. The reading of the spring scale will be maximum when

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Elevator is stationary

Elevator cable breaks and it falls freely towards earth

Elevator accelerates downwards

Elevator accelerates upward

A black body is

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an ideal absorber

an ideal radiator

both of them

none of them

Mechanical waves on the surface of a liquid are

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Transverse

Longitudinal

Torsional

both transverse and longitudinal

The velocity of falling raindrops attains limited value because of

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Up thrust of air

Air currents of the earth atmosphere

Surface tension effect

Viscous force exerted by air

A ball is dropped vertically down and it takes time t to reach the ground. At time t/2

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The ball had covered exactly half the distance

The velocity of the ball was V/3 where V is the velocity when it reached the ground

The ball had covered less than half the distance

The ball had covered more than half the distance

When a vector is multiplied by a negative number, its direction:

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Remains the same

Changes

Changes by 180°

None of these

The force which maintains the strict long-range order between atoms of a crystalline solid is the:

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Nuclear force

Cohesive force

Adhesive force

Coulomb force

None of these

A telescope is rotatable about the same vertical axis as the turntable, with a scale which is

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Main scale

Vernier scale

Half degree scale

None of these

The relative permitivity ∈_r for Paraffined paper is

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1.9

2.0

2.2

2.9

Bouncing off the squash ball several times from wall bears

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Total displacement

Average displacement

No displacement

None of these

Work done per unit charge is

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Electric Flux

Electric potential

Electric intensity

None of these

The S.I. unit of angular displacement is

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Degrees

Revolution

Radian

All of them

In cause of YDS experiment, the distance between adjacent bright fringes is given by

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Δy =λL/d

ΔY = L/λd

ΔY =λ/L

None of these

The idea of light as wave produced by

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Huygen

Newton

Thomos Young

Michelson

When the temperature difference between the source and the the sink increases, the efficiency of the heat engine will

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Increase

Decrease

Is not affected

May increase or decrease depending upon the nature of the working substance

An object is placed at a distance 18 cm from a convex lens. The image is formed at a distance of 9 cm the focal length of the lens is

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6 cm

9 cm

10 cm

18 cm

The number of molecules in one mole of gas is equal to:

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Avogadro number N_A

Gas constant R

Boltzmann constant k

None of these

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