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

Michelson's interferometer is an instrument that is capable of measuring distance with

• low precision A
• high precision B
• extremely high precision C
• extremely low precision D

The wave nature of light was proposed by

• Einstein A
• Maxwell B
• Huygen C
• Newton D

The image formed by an eyepiece of compound microscope is

• Real and diminished A
• Real and enlarged B
• Virtual and enlarged C
• Virtual and diminished D

Such type of fibre in which center core is of high refractive index and the layer over the central core is low refractive index is called

• Step index fibre A
• Multi mode step index fibres B
• Multimode graded index fibre C
• None of these D

Which mode can carry more than 14 TV channels or 14000 phone cells?

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

In newton's rings apparatus, we also use:

• Spectroscope A
• Telescope B
• Microscope C
• Any of these 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

A ray of light passing from a rarer to a denser medium

• Bends towards normal A
• Bends away from normal B
• Suffers no change in direction C
• None of these D

In the thin film, the path difference of two reflected ray depends upon

• Thickness of the film A
• Nature of the film B
• Angle of incidence C
• All of these D

In a spectrometer experiment monochromatic light is incident normally on a diffraction grating having 4.5 x 105 lines per meter.The second order line is seen at an angle of 30 to the normal what is the wavelength of the light?

• 200 nm A
• 430 nm B
• 500 nm C
• 556 nm D

Light waves are:

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

Which of the following is an optical fibre in which the density of central core decreases towards its periphery?

• multi-mode step index fibre A
• multi-mode graded index fibre B
• both of them C
• none of them 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

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

• 
  A
• 
  B
• 
  C
• 
  D

A beam of light enters air from water.Which of the following characteristics of light will not change in water?

• Frequency A
• Wavelength B
• Velocity C
• Amplitude D

Who confirm the wave theory of light ?

• Newton A
• Michelson B
• Newton C
• Thomos Young D

The dichronic substances are used in the process getting plane polarized light

• Selective absorption A
• Refraction through crystals B
• Reflection from different surfaces C
• None of these D

Every point of a wavefront may be considered as a

• Source A
• Source of wavefront B
• Source of secondary wavefront C
• None of these D

Wavelength of a laser beam can be used as a standard of

• Time A
• Angle B
• Length C
• Temperature D