'Parsec' is the unit measurement of

• Density of mars

• Astronomical distance

• Brightness of heavenly bodies

• Orbital velocity of giant stars

A body moving in a circular path with a constant speed has a ........

• constant velocity

• variable acceleration

• constant kinetic energy

• constant displacement

A bomb explodes on the moon. You will hear its sound on earth after ........

• 20 min

• 2 hours 20 min

• 3.7 hours

• You cannot hear the sound of explosion

A galvanometer can be converted into a voltmeter by connecting with it a

• high resistance in parallel

• low resistance on parallel

• high resistance on series

• low resistance in series

A galvanometer can be converted to a voltmeter by connecting

• a high resistance in parallel

• a high resistance in series

• a low resistance in series

• a low resistance in parallel