Page Number- 2

(1) The Sun is visible a little before the actual sunrise and until a little after the actual sunset due to??

  • A. Atmospheric reflection
  • B. Atmospheric refraction
  • C. Scattering of light
  • D. Dispersion of light
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(b) Atmospheric refraction

(2) Which phenomenon is used in optical fibre??

  • A. Total internal factor
  • B. Dispersion
  • C. Scattering
  • D. Reflection
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(a) Total internal factor

(3) The pattern of the colour component of light is called??

  • A. Dispersion
  • B. Spectrum
  • C. Reflection
  • D. None of these
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(b) Spectrum

(4) In the visible spectrum, which colour shows the longest wavelength??

  • A. Red
  • B. Violet
  • C. White
  • D. Yellow
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(a) Red

(5) White light enters a prism and gets split into its constituent colours this phenomenon is called?

  • A. Scattering of light
  • B. Dispersion of light
  • C. Deflection of light
  • D. All of these
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(b) Dispersion of light

(6) The amount of scattering light is inversely proportional to the fourth power of wavelength. This is known as?

  • A. Rayleish scattering
  • B. Rayleish Defraction
  • C. Rayleish Reflection
  • D. Rayleish Dispersion
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(a) Rayleish scattering

(7) If an elderly person tries to read a book at about 25cm from the eye, the image appears blurred a condition known as??

  • A. Presbyopia
  • B. Near sightedness
  • C. Myopia
  • D. Glucomia
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(a) Presbyopia

(8) The phenomenon of diffraction takes place for??

  • A. Sound wave
  • B. Light wave
  • C. Water wave
  • D. All of these
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(d) All of these

(9) The triangle of vector addition is known as??

  • A. Low of parallogram
  • B. Vector law
  • C. Perpendicular law
  • D. None of these
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(a) Low of parallogram

(10) The elements having the same chemical properties but different in mass number are called?

  • A. Isomers
  • B. Isotones
  • C. Isobars
  • D. Isotopes
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(d) Isotopes
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