Question # 1

Fog droplets are suspended in air when their weight is balanced by:

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Force of gravity

Upward trust due to air

Surface tension

None of these

The passage of current is accompanied by a magnetic field in the surrounding space:

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Always accompanied

Sometimes accompanied

Never accompanied

Any of above

None of these

Watt x second is unit of:

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Force

Work

Power

None of these

A ball falls on the surface from 10 m height and rebounds to 2.5 m. if the duration of contact with the floor is 0.01 seconds then the average acceleration during contact is

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2100 m/s²

1400 m/s²

700 m/s²

400 m/s²

Which one of the following is dimensionless.

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Acceleration

Velocity

Density

Angle

Two electric bulbs of 200 W and 100 W have same voltage. If R₁and R₂be their resistance respectively then

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R₁= 2R₂

R₂= 2R₁

R₂=4R₁

R₁= 4R₂

The earth’s potential and potential at infinity are taken:

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Equal

Zero

First is greater than the second

Second is greater than the first

Both (A) and (B)

Resonance occurs when one of the natural frequencies of vibration of the forced or driven harmonic oscillator

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greater than the frequency of applied force

equal to the frequency of applied force

less than the frequency of applied force

all of them

When a shall explodes a mid-air, the total momentum of its fragments is

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less than the momentum of shell

equal to the momentum of shell

greater than the momentum of shell

none of them

A body moves a distance of 10 m along a straight line under the action of a force of 5 N. If the work done is 25 J, the angle which force makes with the direction of motion of a body is:

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0°

30°

60°

90°

Resolving power in mth order diffraction for grating is given by:

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R = N/m

R = m/N

R = N x m

None of these

A beam of light of wavelength is incident normally on a grating of element d the angle between the zero-order and first -order spectra depends on

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λ only

d only

λ and d

λ d and distance of screen from the grating

Crystal lattice is a repetition of

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Atoms

Molecules

Unit cell

All of them

To find wavelength of light by his experiment. Newton utilized:

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Principle of phase change

Snell's Law

Bragg's law

Both (A) and (C)

According to equation E = mc² Kg mass is actually the enrgy

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8 × 10¹⁵ J

9 × 10¹⁷ J

9 × 10¹⁶ J

8 × 10¹⁵ J

A light body A and a heavy body B have equal linear momentum.Then the K.E.of the body A

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is equal to that of B

Is greater than that of B

Is smaller than that of B

Is zero

At systolic pressure, at the point the first surges of blood flow through the narrow stricture produces

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High flow speed

Sound heard

Initially turbulent

All of these

The pattern of NaCI particles have a shape which is:

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Cubic

Body centred cubic

Simple cubic

Face centred

Both A and C

The density of human blood is equal to that of

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Oil

Glycerin

Honey

Water

If the earth suddenly shrinks to half of its present radius the acceleration due to gravity will be

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g/2

4g

g/4

2g

Geometrical optics cannot give following characteristics for a microscope

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Image position

Image size

Resolution of image

Any of the above

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

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Equal

Smaller

Greater

None of these

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