The density of alcohol is 0.8 g cm^-3. In S.I. unit, it will be:

1. 0.8 kg m^-3
2. 0.0008 kg m^-3
3. 800 kg m^-3
4. 8 x 10³ kg m^-3

The density of aluminium is 2.7 g cm^-3 and of brass is 8.4 g cm^-3. For the same mass, the volume of:

1. both will be same
2. aluminium will be less than that of brass
3. aluminium will be more than that of brass
4. nothing can be said

A boy travels a distance 150 m in 1 minute. His speed is:

1. 150 m s^-1
2. 2.5 m s^-1
3. 25 m s^-1
4. 9 m s^-1