(d) 24 hours
Ans: (b)
390. The tiniest of the stars belong to the group known as
   (a) Giant stars
   (b) White Dwarf stars
   (c) Neutron stars
   (d) Super-giant stars
Ans: (c)
391. The star nearest to the sun is
   (a) Proxima Centauri
   (b) Sirius
   (c) Aldebaran
   (d) Vega
Ans: (a)
392. The stars that shine brightly then dimly and then brightly are known as
   (a) meteors
   (b) binaries
   (c) variable stars
   (d) bright stars
Ans: (c)
393. A pair of stars that revolve round each other is
   (a) a neutron star
   (b) a binary star
   (c) a dwarf star
   (d) a polar star
Ans: (b)
394. The colour of a star is an indication of its
   (a) distance from the earth
   (b) age
   (c) temperature
   (d) size