10 Question-Answer on sun stars and galaxies
1. Our sun is
(a) Stationary
(b) Rotating around its own axis
(c) Moving around the centre of milky way
(d) Rotating around the stars.
Ans: (b,c)
2. Wein’s displacement law is useful for finding
(a) Mass of a star
(b) Radius of a star
(c) Temperature of a star
(d) Density of star
Ans: (c)
3. Two, stars, circling around each other constitute
(a) White dwarfs
(b) Neutron stars
(c) Binary stars
(d) None of these
Ans: (c)
4. Temperature of the sun is measured by:
(a) Thermometer
(b) Pyrometer
(c) Hydrometer
(d) Thermocouple.
Ans: (b)
5. The thickness of milky way at the centre is approximately
(a) 100 light year
(b) 500 light years
(c) 5000 light years
(d) 50000 light years
Ans: (c)
6. The shape of Milky way is:
(a) Square type
(b) Circular type
(c) Flat lens shaped disc type
(d) Rectangular type.
Ans: (c)
7. The average life of a star is approximately
(a) 1 billion year
(b) 10 billion year
(c) 100 billion year
(d) Less than 1 billion year.
Ans: (b)
8. Radio telescopes are used:
(a) To detect radio waves from space
(b) To take photography
(c) To magnify stars
(d) To study motion of stars
Ans: ( d)
9. Pulsar is another name of
(a) White dwarf
(b) Neutron star
(c) Nabula
(d) Black hole.
Ans; (b)
10. Heliocentric theory of the universe was first proposed by
(a) Ptolemy
(b) Copernicus
(c) Galileo
(d) Kepler
Ans: (b)