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

The property of light which does not change with the nature of the medium is

• Frequency A
• Amplitude B
• Wavelength C
• None of these D

In which mode, the refractive index steps down form 1.52 to 1.48 at the boundary with the cladding?

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

Spectrometer using diffraction grating can measure

• Wavelength of light A
• Frequency of light B
• Intensity of light C
• None of these D

The most common method to obtain plane polarized light by using dichoric substance is:

• Selective absorption A
• Reflection from different surfaces B
• Refraction from different surfaces C
• Scattering D

In Michelsion's interferometer the path difference is varied by moving

• compensatory plate A
• moveable mirror B
• fixed mirror C
• telescope D

The information received at the other end of a fibre can be inaccurate due to

• dispersion of light signal A
• spreading of light signal B
• both of them C
• none of them D

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity:

• Fringe width will decrease A
• Fringe width will increase B
• Fringe width will remain unchanged C
• Fringe will become less intense D

Monochromatic light means waves of:

• Same frequency A
• Same colour B
• Same wavelength C
• All of them D

• 
  A
• 
  B
• 
  C
• 
  D

If the focal length of objective is 10 mm find its magnification

• 18 A
• 19 B
• 20 C
• 21 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

The waves propagate in space by the motion of the

• wavelengths A
• frequencies B
• wavefronts C
• none of them D

In Newton's rings the thickness of air film at the point of contact is

• maximum A
• minimum B
• equal to wavelength C
• zero 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

The appearance of colours in the shape (or oil) film results from:

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

How many fringes will pass a reference point if the moveable mirror of a Michelson s interferometer is moved 0.06 mm The wavelength of light used is 5.89 x10^-3 mm

• 200 A
• 300 B
• 20.4 C
• 2.3 D

For interference to occur the two light waves should be:

• Of two different frequencies A
• Coming from opposite directions B
• Of high intensity C
• Monochromatic D

The polarized can be achieved by using process like

• Coherent sources A
• Diffraction B
• Selective absorption C
• None of these D

There will be no change in _______ of light entering glass

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

The ratio of diameters of two convex lenses is ______ the ratio of their focal lengths

• Greater than A
• Less than B
• Equal to C
• Square of D