Physics - Optics

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Question - 1

Consider the following statements

1.If magenta and yellow coloured circles intersect, the intersected area will have red colour.

2.If cyan and magenta coloured circles intersect, the intersected area will have blue colour.

Which of the statement(s) given above is/are correct?

  • A Only 1
  • B Only 2
  • C Both 1 and 2
  • D Neither 1 nor 2

Question - 2

Which one of the following phenomena cannot be attributed to the refraction of light?

  • A Twinkling of stars
  • B Mirage
  • C Rainbow
  • D Redshift

Question - 3

A double convex glass lens of focal length f and having a circular aperture is cut into two halves, each having a semicircular aperture.

The focal length of each half is

  • A f
  • B 2f
  • C f/2
  • D infinity

Question - 4

A person standing in front of a mirror finds his image thinner but with normal height. The mirror in question is

  • A concave and spherical
  • B convex and spherical
  • C convex and cylindrical with axis vertical
  • D convex and cylindrical with axis horizontal

Question - 5

Why is red light employed for danger signals?

  • A Red colour is smothing to the eye
  • B Human eye is most sensitive to red colour
  • C Red light is scattered least
  • D Red light is scattered most

Question - 6

Whose experiments proved that the speed of light was always the same 

  • A James Clark Maxwell
  • B Michelson and Marley
  • C Miller and Stanley
  • D Werner and Heisenberg

Question - 7

The energy associated with the light depends upon

  • A its speed
  • B medium through which it passes
  • C its frequency
  • D All of the above

Question - 8

Phenomenon of formation of three dimensional image by entrance of two light beams from laser or other coherent sources of light is called

  • A optical photography
  • B X-rays photography
  • C radiography
  • D holography

Question - 9

Assertion (A) In the visible spectrum of light, red light is more energetic than green light.

Reason (R) The wavelength of red light is more than that of green light.

  • A A and R are individually true and R is the correct explanation of A
  • B A and R are individually true but R is not the correct explanation of A
  • C A is true, but R is false
  • D A is false, but R is true

Question - 10

The image formed by plane mirror is

  • A real
  • B virtual
  • C may be virtual or real depending on the position of the object
  • D None of the above
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