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

In order to observe interference , the interfering beams must be

• monochromatic A
• coherent B
• either of them C
• both of them D

While viewing a distant object with a telescope suddenly a housefly sits on objective lens.The correct statement is that

• Housefly will be seen enlarged in image A
• Housefly will be seen reduced in image B
• Intensity of image will be decreased C
• Intensity of image will be increased D

In Bragg's Equation 2d sin θ = nλ, where 'n' is

• Order of spectrum A
• Number of reflections B
• Order of reflection C
• None of these D

How many phone calls can be carried by single mode step index fibre

• 25000 A
• 96000 B
• 14000 C
• 21000 D

Alexander graham bell transmits a voice message via a

• Beam of light A
• Telescope B
• Compound microscope C
• Mirror D

Which light travels faster in optical fibres?

• visible light A
• ultraviolet B
• infra-red C
• any one of them D

The light waves and radio waves differ in

• Speed A
• Frequency B
• Wavelength C
• Both B and C D

At what distance should a book be placed from a 50 Cd bulb so that the luminance on the book becomes 2 Im m^-2

• 50 m A
• 10 m B
• 5 m C
• 1 m D

• 
  A
• 
  B
• 
  C
• 
  D

If the bright fringe into be observed then we have relation

• Y = mLd/λ A
• Y = mλL/d B
• Y = λd/mL C
• Y = λL/md D

The reflected light is

• Unpolarized A
• Polarized B
• Partially polarized C
• None of these D

According to Huygen,every point on a wavefront may be regarded as a.........of secondary wavelets.

• Base A
• Source B
• Producer C
• Origin D

In case of destructive interference of two waves, the amplitude of the resultant wave will be_______either of the waves:

• Greater than A
• Smaller than B
• Equal to C
• none of these D

Colours seen on oily water surface by the incident white light is due to

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

The brilliance of diamond is

• Entirely due to refractive index A
• Entirely due to total internal reflection B
• Partly due to total internal reflection C
• None of the above D

To observe the phenomenon of interference of light, the light should be

• Monochromatic A
• Phase coherence B
• Coherent sources C
• All of these D

Wave length of red colour as compared to that of violet colour is:

• Smaller A
• Longer B
• Equal C
• None of these D

The different parts of spectrometer

• Collimator A
• Turn table B
• Telescope C
• All of these D

A convex lens is dipped in a liquid whose refractive index is equal to the material of the lens. Then its focal length will become

• Infinite A
• Zero B
• Extremely small C
• Extremely large 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