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

Screw Gauge is an instrument used to measure the dimensions of very small objects upto _________ (0.1 cm, 0.01 cm, 0.1 mm, 0.01 mm)

In a Screw Gauge, if the zero of the head scale lies below the pitch scale axis, the zero error is_________ .(positive, negative, nil)

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

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