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

The fibre core has constant refractive index such as

• 1.48 A
• 1.5 B
• 1.52 C
• 1.56 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 spectrum which contains all wavelengths without any break is called

• Emission spectrum A
• Line spectrum B
• Continuous emission spectrum C
• All of them D

For the normal setting of a telescope

• Only the object is at infinity A
• Only the final image is at infinity B
• Both the object and the final image is at infinity C
• Neither the object nor the final image has to be at infinity D

A compound microscope is consists of

• One convex lens A
• Two convex lenses B
• Two concave lenses C
• None of these D

A spectrometer is an optical device used to study the spectra from different sources of light which is

• Absorption spectra A
• Emission spectra  B
• Discrete spectra C
• None of these D

In the thin film, the path difference between the two reflecting waves depends upon

• thickness of film A
• nature of film B
• angle of incidence C
• all of them 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

Proportion of light in an optical fibre requires that the light-should be within the fibre

• Very little confined A
• Largely confined B
• Totally confined C
• None of these D

The fiber of which refractive index ______ gradually as move from central core to its periphery is called ______ index fiber

• Decreases, multi-mode graded A
• Increases, single mode step B
• Either of A or B C
• Increases, multi-mode step D

With the help of interferometer, we can find the

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

When monochromatic light is incident, making certain angle, on a thin parallel film, the interference fringes formed are

• straight A
• circular B
• square C
• plane D

The multi-mode step index optical fibre, the central core has

• high refractive index and low density A
• low refractive index and density B
• low refractive index and low density C
• high refractive index and high density D

X-ray diffraction has been very useful in determining structure of

• Hemoglobin A
• Double helix structure of DNA B
• Blood speed C
• a and b D

By which principle we can locate the position of new wavefront after a later time?

• principle of irreversibility A
• principle of light B
• Archimedes principle C
• Huygen's principle D

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

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

• 
  A
• 
  B
• 
  C
• 
  D

When the object is closer to eye or near point, the image becomes

• Sharp A
• Clear visible B
• Blurred C
• None of these D

An object is placed at a distance of 200 cm from a convex lens of focal length 10 cm the linear magnification is

• 1/3 A
• 2/3 B
• 3/4 C
• None D

According to the Huygen's principle, the secondary wavelets propagate in the forward direction with a speed equal to

• speed of wave motion A
• speed of medium B
• speed of electrons C
• speed of protons D