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

• 
  A
• 
  B
• 
  C
• 
  D

The distance between the centres of two consecutive bright fringes (or dark fringes) is called

• wavelength A
• fringe width B
• amplitude C
• path difference D

If the distance of a surface from light source is doubled,then the luminance will become

• 1/4 times A
• 1/2 times B
• 2 times C
• 4 times D

The image formed after objective lens of an astronomical telescope is

• Inverted A
• Diminished B
• Real C
• All of these D

Power of a lens is equal to

• Focal length in meters A
• Reciprocal of focal length expressed in meters B
• Double the focal length C
• Half the focal length D

In a astronomical telescope the final image for normal vision is formed at

• The focal of the eye piece A
• The least distance of the distinct vision B
• The focus of the objective lens C
• Infinity D

Whenever high magnification is desired

• A telescope is used A
• A compound microscope is used B
• A microscope is used C
• None of these D

In an interference fringes pattern the fringes are

• Equally spaced A
• Wider near the centre and narrower away from it B
• Narrower near the centre and wider away from it C
• None of these D

A normal to the waves front showing direction of propagating of wave is called

• Photon A
• Particle B
• Ray C
• Line D

The distance between the concentric wavefronts is

• half wavelength A
• one wavelength B
• one and a half wavelength C
• none of them D

An oil surface floating on water surface exhibits beautiful colour patter, which is due to 

• Reflection of light A
• Diffraction of light B
• Interference of light C
• None of these D

If the cover of a red book is observed in monochromatic blue light,It will appear

• White A
• Red B
• Black C
• Blue D

If d = 0.25 cm   Y = 0.059 cm   L = 100 cm    m = 2 then λ is equal to

• 567 nm A
• 569 nm B
• 590 nm C
• 596 nm D

The function of colimator is

• To converge the incoming rays A
• To make the parallel rays from source B
• In which the source of light is kept C
• None of these D

Inverse square law for luminace is valid for

• Search light A
• Isotropic point source B
• Cylindrical source C
• All types of source D

In newton's rings see through the reflected light, centeral spo is:

• Bright A
• Dark B
• Either of the Two C
• None of these D

A spherical wavefront is that which has

• A source A
• A point source B
• An extended source C
• None of these D

The laser light used in an optical fiber system has a wavelength equal to

• 3μm A
• 5μm B
• 1.3μm C
• 6μm D

Using monochromatic light, interference fringes are produced on a screen placed a distance D from a pair of slits of separation a.

The separation of the fringes is X.

a is now halved and D is increased by a factor of 4.

What is the new fringe separation?

• 16 X A
• 8 X B
• 4 X C
• 2 X D

According to the relation for constructive destructive interference, the point of contact has zero thickness of air so it should have

• No interference A
• Conductive interference  B
• Destructive interference C
• None of these D