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

The wavelength of refractive wave in a denser medium is

• Same as that of the incident wave A
• Become smaller than the incident B
• Becomes greater than the incident wave C
• None of these D

The ratio of size of the image to the size of the object is called

• Resolving power A
• Magnification B
• Power C
• None of these D

When 'θ' is small then

• tan θ ≈ sin θ A
• cos θ ≈ sin θ B
• sin θ ≈ tan θ C
• None of these D

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

• M₁+ M₂ A
• M₁M₂ B
• M₁- M₂ C
• M₁/ M₂ D

In Michelsion's interoferometer, if the moveable mirror is moved through a distance 0.05 mm and 500 finges are observed, then the wavelength of light used is

• 1 x 10^-7m A
• 2 x 10^-7m B
• 1.5 x 10^-7m C
• 1 x 10^-8m D

Power of a lens is equal to

• Focal length in meters A
• Reciprocal of focal length expressed in meters B
• Double the focal length C
• Half the focal length D

Michelson,s interferometer can be used to measure

• Wavelength of light A
• Intensity of light B
• Amplitude of wave C
• None of these D

For the sustained interference of light the necessary condition is that the two sources should

• Have constant phase difference A
• Be narrow B
• Be close to each other C
• Of same amplitude D

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

• λ only A
• d only B
• λ and d C
• λ d and distance of screen from the grating D

• 
  A
• 
  B
• 
  C
• 
  D

The central ring is bright in case of newton's ring produced by:

• Reflected light A
• Transmitted light B
• Wedged film C
• None of above D

The property of bending of light around the obstacle is known is

• Interference A
• Polarization B
• Diffraction C
• None of these D

Fire optics has ability to transmit

• Thousand telephone conversation A
• Several television programs B
• Numerous data signals between stations C
• All of these D

On a diffraction grating which thing acts as a slit

• the lines which are ruled on it A
• the spacing between the lines B
• either of them C
• none of them D

The spacing between the parallel lines are served as

• slits A
• source of light B
• opaque lines C
• fringes D

The fringe spacing in case of blue light

• Increases A
• Remains the same B
• Decreases C
• None of these D

Let a ray of light enters from air into two media of different refractive indices. The speed of light will be ______ to refractive index

• Directly proportional A
• Inversely proportional B
• Sometimes inversely C
• Equal D

A convex ens acts as diverging lens when the object is placed

• Between F and 2F A
• At 2F B
• Within the focal length C
• Beyond 2F D

The fringes produced in Young's double slit experiment will be wider if the distance between the two slits is

• small A
• large B
• zero C
• very large 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