During star formation the stars are prevented to collapse under gravity by……..
a) nuclear reactions
b) other stars
c) mass of gases
d) black hole
A Pulsar is type of ……..
a) white dwarf
b) neutron star
c) black hole
d) red giant
To form a black hole, the initial mass of the star in solar masses should be…….
a) 0.5
b) 1
c) 3
d) 7
The total life of sun (from birth to its death) is
a) 100 million years
b) 4.6 billion years
c) 5 billion years
d) 10 billion years
Optical telescopes make use of…….
a) X-rays
b) infra-red light
c) visible light
d) radio waves
The unmanned object launched into space to study celestial objects is…..
a) steatite
b) star
c) space probe
d) space telescope
