26. Pulsar is a neutron star which produces regular pulses of ....................... radiation.
a) Gamma
b) Electromagnetic
c) Microwave
d) Ultraviolet

27. Globular clusters of the stars contain ------------------ stars.
a) Few hundred
b) Several thousand
c) more than one million
d) ten millions

28. Largest unit of the universe is believed to be ..........................
a) Galaxy
b) Stars
c) Super clusters
d) Solar system

29. Lunar eclipses are of ------------ types.
a) 2
b) 3
c) 4
d) Non of the above

30. Solar eclipse can occur only at -----------------.
a) Full moon
b) New moon
c) Summer season
d) Non of the above