MDCAT Physics Chapter 7 MCQ Test With Answer for (Light )

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  A
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  B
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  C
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  D

Which phenomenon of light takes place in Young's double-slit experiment?

• polarization of light A
• diffraction of light B
• interference of light C
• reflection of light D

Diffraction effect is

• More for a round edge A
• More for a sharp edge B
• Less for a sharp edge C
• None of these D

A planet is observed by an astronomical refracting telescope having an objective of focal length 16 m and an eyepiece of focal length 2 cm.

• The distance between the objective and the eyepiece is 8m A
• The angular magnification of the planet is 200 B
• The image of the planet is inverted C
• The objective is smaller than the eyepiece D

The distance between the concentric wavefronts is

• half wavelength A
• one wavelength B
• one and a half wavelength C
• none of them D

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

• Δy =λL/d A
• ΔY = L/λd B
• ΔY =λ/L C
• None of these D

Which type of fibre is used to send the signals of long distances?

• single mode step index fibre A
• multimode step index fibre B
• multimode graded index fibre C
• all of them D

Two sources are said to be coherent if they have:

• Same amplitude A
• Same wavelength B
• Definite phase relation with each other C
• None of them D

We can divide the optical fibres on the basis of the mode by which they propagate light in

• two types A
• three types B
• four types C
• many types D

Whenever high magnification is desired

• A telescope is used A
• A compound microscope is used B
• A microscope is used C
• None of these D

For interference to occur, the light coming from the two slits should

• be monochromatic A
• come from the same source B
• have a constant path difference C
• all of them D

Graham Bell photo phone used a modulated beam of

• Reflected sun light A
• Refracted sun light B
• Diffracted sun light C
• None of these D

Which of the following theories of light are explained by the Young's double slit experiment?

• wave theory of light A
• particle nature of light B
• dual nature of light C
• corpuscular nature of light D

In Michelsion's interferometer, if a dark fringe is seen in the beginning, the next dark fringe will appear by moving the moveable mirror through a distance

• λ/2 A
• λ/4 B
• λ C
• 2λ D

A completely transparent material will be invisible in vacuum when the refractive index n is

• Unity A
• More than unity B
• Less than unity C
• Equal to 1.33 D

When a plane polarized light is passed through certain crystals they

• Are totally absorbed A
• Are totally reflected B
• Rotate the plane of polarization C
• None of these D

For total internal reflection to take place, the angle of incidence must be ______ than critical angle and the light should travel from ______ to ______ medium

• Greater, rarer, denser A
• Smaller, rarer, denser B
• Smaller, denser, rarer C
• Greater, denser, rarer D

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

• convex lens A
• thin film B
• diffraction grating C
• interferometer D

Light waves are:

• Transverse waves A
• Longitudinal waves B
• Compressional waves C
• None of them D

The splitting of white light into several colors on passing through a glass prism is due to

• Refraction A
• Reflection B
• Interference C
• Diffraction D