The most abundant element in the Earth’s crust:
a) Oxygen
b) Hydrogen
c) Carbon Dioxide
d) Silicon (more…)
The most abundant element in the universe is:
a) Oxygen
b) Hydrogen
c) Carbon Dioxide
d) Silicon (more…)
A device which converts chemical energy into electrical energy is called:
a) motor
b) generator
c) moving-coil meter
d) battery (more…)
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