The density of water is __________?
- 1 g/cm3
- 1.5 g/cm3
- 2 g/cm3
- none of these
Radioactivity was discovered by __________?
A device which converts chemical energy into electrical energy is called __________?
- moving-coil meter
The Sun is a __________?
The gas used in a refrigerator to cool water is___________?
- Carbon dioxide