General Science/Basic Science Electromagnetic Waves Sample Test,Sample questions

Question:
A device used to get plane polarized light is


1.grating

2. spectrometer

3. polarizer

4. pyroheliometer


Question:
A device using micro crystal of herapathite (iodosulphate of quinine) is used for the production of

1. diffraction

2. X-rays

3. interference pattern

4. polarization of light


Question:
A mixture of plane polarized light and un-polarized light is known as

1. plane polarized light

2. partially polarized light

3. un-polarized light

4. polarized light


Question:
According to Brewsters law the tangent of polarizing angle is

1. equal to the refractive index of the medium

2. directly proportional to the square root of the refractive index of the medium

3. same in only one direction namely along the optic axis

4. directly proportional to the square of the refractive index of the medium


Question:
Along the direction of the optic axis of a calcite crystal the ordinary rays travel with

1. the same velocity as that of the extraordinary rays

2. half the velocity of the extraordinary rays

3. two times the velocity of the extraordinary rays

4. ?2 times the velocity of the extraordinary rays


Question:
An example of biaxial crystal is


1.Quartz

2.Mica

3.Ice

4.Calcite


Question:
Brewsters law in polarization of light by reflection states that

1. � = 1/tan ip

2. tan ip = �

3.tan r = �

4. tan-1(ip) = �


Question:
Double diffraction is exhibited by


1. glass

2. gas

3. calcite

4.liquid


Question:
Double diffraction phenomenon was first observed by


1. Newton

2. Fresnel

3.Bartholinus

4. Brewster


Question:
Example of biaxial crystal is

1. calcite

2.quartz

3. ice

4. topaz


Question:
Example of uniaxial crystal is




1. mica

2.quartz

3.topaz

4.selenite


Question:
For one incident ray there will be generally two refracted rays in double refraction in calcite crystals Which of the following statement is correct?

1. Out of two refracted rays one is polarized and the other is not

2. Both are polarize in the same plane of polarization

3. Both are polarized but their planes of polarization are at right angles to each other

4. Neither is polarized


Question:
From Brewsters law we find that polarizing angle depends on

1. the plane of vibration of the beam

2. the plane of polarization of the beam

3. the refractive index of the medium

4. the thickness of the medium


Question:
H- Polaroid is a thin film of
nitrocellulose

1. herpatite impregnated with

2. quinine iodosulphate impregnated with iodine

3.polyvinyl chloride

4. polyvinyl alhohol


Question:
H-polaroids and K-polaroids are prepared by using

1. Nicol prisms

2. iodosulphate of quinine

3. a thin film of polyvinyl alcohol

4. calcite crystal


Question:
If the polarizing angle for glass plate is 60� then the refractive index of the glass plate is 05

1. 05

2. ?3/2

3. ?3

4. 1/?2


Question:
If the refraction index of a medium like glass is � the polarizing angle ip is given by

1. ip = sin-1 (�)

2. ip = cos-1 (�)

3.ip = tan-1 (�)

4.ip = tan �


Question:
In a doubly refracting crystal along the optic axis the ordinary ray and the extraordinary ray

1. travel with the same velocity

2. have different velocities

3. travel slowly

4. travel faster


Question:
In Nicol prism the phenomenon that takes place at the layer of Canada balsam isextraordinary and refraction 

1. reflection only

2. total internal reflection for ordinary and refraction for extraordinary rays

3. total internal reflection for

4.for ordinary rays refraction only


Question:
In Nicol prism the refractive indices for the ordinary ray and the extraordinary ray are


1. 149 and 166 respectively

2. 166 and 149 respectively

3. 155 and 166 respectively

4. 155 for both


Question:
In polarization the plane of vibration is the plane

1. parallel to the vibration of particles

2. containing the optic axis in which vibrations occur

3. perpendicular to the optic axis

4. containing the direction of propagation of polarized light


Question:
Light is incident on a surface at a polarizing angle 57� Then the reflected beam is at


1.57�

2.33�

3.90�

4.60�


Question:
Light waves are



1.longitudinal

2.transverse

3. like sound waves

4. like pressure waves


Question:
Nicol prism is made up of

1. Nicol crystal

2. calcite

3. mica

4. quartz


Question:
Nicol prism is used to produce

1. diffraction of light

2. polarized light

3. spectrum

4. refraction of light


Question:
On rotating the analyzer if the intensity of light rays coming out of it varies from maximum to zero then the incident beam of light is

1. un-polarized

2. plane polarized

3. partially polarized

4. polarized


Question:
On rotating the analyzer if the rays coming out of it has same intensity then the incident beam is


1. plane polarized

2.partially polarized

3. un-polarized

4.polarized


Question:
On rotating the analyzer if the rays coming out of it has the intensity varies from maximum to minimum then the incident light is

1. un-polarized

2. plane polarized

3. partially polarized

4. polarized


Question:
Plane of polarization is the plane

1. containing the optic axis

2. in which vibration of particles takes place

3. perpendicular to the plane of vibration containing the direction of propagation of polarized light

4. parallel to the plane of vibration


Question:
Polarization of light by reflection on the surface of glass was discovered by





1.Bartholinus

2.Malus

3.Brewster

4.Fresnel


Question:
Polarized light when used for viewing Aerial Pictures gives

1. a brighter image

2. more contrast to the image

3. a better perception of depth

4. different colors to the image


Question:
Polaroid are used in aero planes to

1. reduce pressure

2. increase incoming radiations

3. reduce incoming radiations

4. increase pressure


Question:
Sound waves cannot be polarized while light waves can be polarized because

1. sound travels slower than light

2. light waves are transverse while sound waves are longitudinal

3. light waves are longitudinal while sound waves are transverse

4. sound waves have longer wavelength than waves


Question:
The angle of inclination of pile of plates to the axis of the tube is

1. 725�

2. 325�

3. 575�

4. 90�


Question:
The light emerging from a Nicol prism

1. has vibration in all directions

2. has vibration in one direction only

3. has no vibration at all

4. has vibrations in two mutually perpendicular directions


Question:
The light which cannot be completely plane polarized by reflection is

1. red color

2. green color

3.white color

4. blue color


Question:
The optical component used to produce stereoscopic motion picture is

1.Polaroid

2. Diffraction gratings

3. Beam splitters

4. Interferometers


Question:
The phenomenon that takes place in a Nicol prism is

1. dispersion

2.scattering

3.deviation

4. double refraction


Question:
The phenomenon used in the construction of pie of plates is

1. interference of light

2.diffraction of light

3. refraction of light

4. polarization by reflection


Question:
The phenomenon which proves that light waves are transverse wave is


1.diffraction

2. refraction

3. polarization

4. total internal reflection


Question:
The planes of vibrations of the extraordinary and the ordinary rays are

1. parallel to each other

2. perpendicular to each other

3. making an angle of 575� with the axis

4. making an angle of 325� with the axis


Question:
The polarizing angle for glass is about

25

1. 360�

2. 420�

3. 575�

4. 900�


Question:
The production of stereoscopic motion picture uses the principle of


1. interference

2.diffraction

3. polarization

4. reflection


Question:
The property that distinguishes the transverse waves from the longitudinal waves is



1. reflection

2. dispersion

3.polarization

4.interference


Question:
The velocity of the extraordinary ray and that of the ordinary ray in calcite crystal are

1. same in all directions

2. different in all directions

3. same in only one direction namely along the optic axis

4. zero in one direction and more than zero in perpendicular direction


Question:
Tourmaline crystal is

1. an uniaxial crystal

2. a biaxial crystal

3. an opaque crystal

4. a single refracting crystal


Question:
When light is incident on a plane surface at the polarizing angle the angle between the reflected beam and the refracted beam





1.45�

2.90�

3.575�

4.325�


Question:
Which one of the following cannot be polarized

1. sound waves

2. X-rays

3. microwaves

4. radio waves


Question:
Which one of the following is an example biaxial crystal



1.Tourmaline

2.Quartz

3.Calcite

4.Mica


Question:
Which one of the following is used to give a three dimensional view in stereoscopic motion picture

1. Polaroid

2. grating

3. prism

4. glass slab


Question:
Which one of the following may be used both as a polarizer and a analyzer

1. Nicol prism

2. liquid prism

3. rock crystal

4. crystal of diamond


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