### 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?

• 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