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

1.Quartz

2.Mica

3.Ice

4.Calcite

1. � = 1/tan ip

2. tan ip = �

3.tan r = �

4. tan-1(ip) = �

1. glass

2. gas

3. calcite

4.liquid

1. Newton

2. Fresnel

3.Bartholinus

4. Brewster

1. calcite

2.quartz

3. ice

4. topaz

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

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

1.57�

2.33�

3.90�

4.60�

Question: ```Light waves are ```

1.longitudinal

2.transverse

3. like sound waves

4. like pressure waves

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

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

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

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

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

1. 360�

2. 420�

3. 575�

4. 900�

1. interference

2.diffraction

3. polarization

4. reflection

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

1.45�

2.90�

3.575�

4.325�

1. sound waves

2. X-rays

3. microwaves

1.Tourmaline

2.Quartz

3.Calcite

4.Mica

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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