Physics - Universe

Question - 1

Which one of the following nuclear reaction is a source of energy in the sun?

  • A \(_{ 4 }{ Be }^{ 9 }\)+\(_{ 2 }{ He }^{ 4 }\)\(\rightarrow \)\({ _{ 6 }C }^{ 12 }\)+\({ _{ 0 }n }^{ 1 } \)j
  • B \(_{ 2 }{ He }^{ 3 }\)+\(_{ 2 }{ He }^{ 3 }\)\(\rightarrow \)\(_{ 2 }{ He }^{ 4 } \)+\(_{ 1 }{ H }^{ 1 }\)+\(_{ 1 }{ H }^{ 1 }\)
  • C \(_{ 56 }{ Ba }^{ 144 }\)+\(_{ 36 }{ Kr }^{ 92 }\)\(\rightarrow \)\(_{ 92 }{ U }^{ 235 }\)+\(_{ 0 }{ n }^{ 1 }\)
  • D \(_{ 26 }{ Fe }^{ 50 }\)+\(_{ 48 }{ Ca }^{ 112 }\)\(\rightarrow \)\(_{ 74 }{ W }^{ 161 }\)+\(_{ 0 }{ n }^{ 1 }\)

Question - 2

Asteroids are

  • A small planets
  • B shooting stars
  • C found in a belt between Earth and Venus
  • D None of the above

Question - 3

What causes the Fraunhoffer lines in the solar spectrum?

  • A Absorption of radiation
  • B Emission of radiation
  • C Both absorption and emission of radiation
  • D Neither absorption nor emission of radiation

Question - 4

The maximum amount of radiation in the earth's atmosphere is of the type

  • A X-ray
  • B Gammaray
  • C ultraviolet
  • D infrared

Question - 5

The expansion of galaxies is supported by

  • A neutron star
  • B White dwarf star
  • C red shift
  • D black holes

Question - 6

Time taken by the light to travel from sun to earth is approximately

  • A 8 s
  • B 8 min
  • C 8 h
  • D 8 light year

Question - 7

The theoretical limit to the size of the universe is about

  • A ten million year
  • B million light year
  • C hundred million light year
  • D ten thousand million light year

Question - 8

Basis of Hubble's law is

  • A Law of gravitation
  • B Stefan's law
  • C Doppler effect
  • D Wien's law

Question - 9

As we go up in the atmosphere, the heights of the various regions are in the order

  • A stratosphere>troposphere>ionosphere
  • B troposphere>ionosphere>stratosphere
  • C ionosphere>troposphere>stratosphere
  • D ionosphere>stratosphere>troposphere

Question - 10

The region of the atmosphere above troposphere is known as 

  • A lithosphere
  • B uppersphere
  • C ionosphere
  • D stratosphere
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