One astronomical unit is the mean distance between the centre of the Earth and centre of the _________ i) Moon ii) Sun iii) Mars

The Screw Gauge is used to measure the diameter of a _________ (crowbar, thin wire, cricket ball )

One light year is equal to _________.

i) 365.25 x 24 x 60 x 60 x 3 x 10⁸ m

ii) 1x 24 x 60 x 60 x 3 x 10⁸ m

iii) 360 x 24 x 60 x 60 x 3 x 10⁸ m

Correct the mistakes if any, in the following statements:

i) Astronomical unit is the mean distance of the surface of the sun from the surface of the earth.

ii) Light year is the distance travelled by light in one year in vacuum at a speed of 3x10⁸m per minute.

Match the items in group A with the items in group B: