Question # 1

The appearance of the colour in the soap (oil) film results from:

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Dispersion

Interference

Reflection

Refraction

Example of vibratory motion is

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mass suspended from a spring

a bob of simple pendulum

mass attached to a spring placed

all of them

Referring to above figure, a changing current in coil P can be produced:

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At the instant the switch is closed

At the instant the switch is opened

With the help of rheostat

All of these

None of these

The smooth or steady stream-line flow is know as

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Laminar flow

Turbulent flow

Both a and b

None of the above

Amplitude in SHM is equivalent to_____ in circular motion:

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Diameter

Radius

Circumference

None of these

Hydrogen and helium of same volume V at same temperature T and same pressure P are mixed to have same volume V. The resulting pressure of the mixtures will be

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R/2

P

2P

Depending on the relative mass of the gases

Lyman series in the spectrum of hydrogen exists in the :

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Infra-red region

Visible region

Ultraviolet region

Both(A) and (B)

None of these

Electrolysis is the study of conduction of electricity through:

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Solids

Liquids

Gases

Plasma

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°

The work performed on an object does not depend on:

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Force applied

Angle at which force is inclined to the displacement

Initial velocity of the object

Displacement

The contrast in the fringes in an interference pattern depends upon

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Fringe width

Relative difference intensities of the two sources

Distance between the slits

Wavelength

The light source used in multimode step index fibre is

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A monochromatic source

Red light

White light

None of these

A glass plate on which a large number of very fine equidistant parallel lines are drawn is called

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convex lens

thin film

diffraction grating

interferometer

The total magnification of a combination of two lenses having individual magnification M1 and M2 is

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M₁+ M₂

M₁M₂

M₁- M₂

M₁/ M₂

Michelesion's interferometer is an instrument usually used to measure

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intensity of light

speed of light

wavelength of light

dispersion of light

The engine of a car produces acceleration of 4 m/s²in the car.If this car pulls another car same mass,what will be the acceleration produces in m/s²

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2

8

4

12

In the study of interference and diffraction, we consider

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plane waves

plane wavefronts

both of them

none of them

To get high resolving power for a telescope one should use

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Objective of large aperture

Objective of large focal length

Eye piece of large focal length

Eye piece of small focal length

Fringe spacing ΔY is the distance between two adjacent bring fringes on the screen is

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ΔY = Lλ/d

ΔY = Ld/λ

ΔY = dλ/L

ΔY = Lλ/d m

Which effect provides direct experimental evidence that light is a transverse rather than a longitudinal wave motion?

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Light can be diffracted

Two coherent light waves can be made to interfere.

The intensity of light from a point source falls off inversely as the square of the distance from the source

Light can be polarized

A diode characteristics curve is a graph plotted between;

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Current and time

Voltage and time

Voltage and current

Forward voltage and reverse current

When the light is incident on polarizing angle which of the following is completely polarized?

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Reflected light

Refracted light

Both reflected and refracted light

Neither reflected nor refracted light

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