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Exercise

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16 

Solar eclipse will take place when

A. the sun is between the moon and the earth
B. the earth is between the moon and the sun
C the moon is between the sun and the earth
D. the moon does not lie on the line joining the sun and the earth

17 

Stars which appear single to the naked eye but are double when seen through a telescope are

A. novas and supernovas
B. binaries
C asteroids
D. quasars

18 

Rainbow is due to

A. absorption of sunlight in minute water droplets
B. diffusion of sunlight through water droplets
C ionisation of water deposits
D. refraction and reflection of sunlight by water droplets

19 

On a stationary sail boat, air is blown from a fan attached to the boat. The boat

A. moves in opposite direction in which the air is blown
B. does not move
C moves in the same direction in which air blows
D. spins around

20 

Mach number is used in connection with the speed of

A. sound B. aircraft
C. spacecraft D. ships

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