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

In which of the optical fibres, the propagation of light signal is through continuous refraction?

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

The resolving power of telescope depends on

• Focal length of eye lens A
• Focal length of objective lens B
• Length of the telescope C
• Diameter of he objective lens D

When an image is placed at the focal length of the eye piece, the final image formed at

• 2 F A
• 4 F B
• 6 F C
• Infinity D

Which phenomenon of light conclusively prove that light waves are transverse waves

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

• 
  A
• 
  B
• 
  C
• 
  D

A telescope has an objective of focal length 10 cm the magnifying power of telescope is 5.Its length in normal adjustment is

• 7.5cm A
• 10.5 cm B
• 12 cm C
• 15 cm D

Characteristics of optic fibre is/are

• Much thineer A
• Light weight B
• Extremely wide bandwidth C
• All of these D

The magnifying power of an instrument is expressed in

• Radians A
• Degrees B
• No units C
• None of these D

The object is placed at the principle focus of a simple microscope if the focal length of the lens is 2cm what is the magnifying power of the microscope

• 13.5 A
• 12.5 B
• Infinity C
• None of these D

If the angle of refraction is 90^o, for which the angle of incidence is called

• Incident angle A
• Critical angle B
• Angle of emergence C
• None of these D

Multimode step index fibre is useful for

• short distance A
• long distance B
• both a and b C
• none of them D

Angle between ray of light and the corresponding wavefront is:

• 0° A
• 60° B
• 90° C
• 120° D

For glass-air boundary, the value of the critical angle is

• 42° A
• 45° B
• 30° C
• 60° D

Experimental demonstration of wave nature of light was given in 1801 by

• New ton A
• Maxwell B
• Thomas young C
• Huygen D

The superposition of the two waves of same frequency and amplitude travelling in the same direction gives rise to an effect called:

• Diffraction A
• Interference B
• Polarization C
• Dispersion D

A monochromatic source of light gives light of

• one colour A
• two colours B
• four colours C
• seven colours D

A two-slit arrangement is set up to produce an interference pattern on a screen. The fringes are too close together for convenient observation. How could the distance between them be increased?

• by using a light of longer wavelength A
• by increasing the width of the slits B
• by decreasing the distance between the screen and slits C
• the distance between the fringes is impossible D

Which property of waves proves that light is a transverse wave?

• diffraction A
• interference B
• polarization C
• reflection D

The concentration in solution can be determined by the property known as

• Solubility A
• Insolubility B
• Optical activity C
• None of these D

Optical fibres function on the principle of

• reflection A
• refraction B
• total internal reflection C
• total internal refraction D