It takes time 8 min for light to reach from the sun to the earth surface. If speed of light is taken to be 3 x 10⁸ms^-1, find the distance from the sun to the earth in km.

'The distance of a star from the earth is 8.33 light minutes'. What do you mean by this statement? Express the distance in metre.

On bringing the two jaws of a vernier callipers together, the 6th division of vernier scale coincides with the main scale. If the least count of the vernier callipers is 0.01 cm, then its zero error is:

1. +0.06 cm
2. +0.6 cm
3. +0.006 cm
4. +0.001 cm

A microscope has its main scale with 20 divisions in 1 cm and vernier scale with 25 divisions, the length of which is equal to the length of 24 divisions of main scale. The least count of microscope is :

1. 0.002 cm
2. 0.001 cm
3. 0.02 cm
4. 0.01 cm