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The most abundant element in the universe is:
a) Oxygen
b) Hydrogen
c) Carbon Dioxide
d) Silicon (more…)
The Sun is a:
a) star
b) planet
c) asteroid
d) meteor (more…)
A device which converts chemical energy into electrical energy is called:
a) motor
b) generator
c) moving-coil meter
d) battery (more…)
Radioactivity was discovered by:
a) Kelvin
b) Thomson
c) Rutherford
d) Becquerel (more…)
The density of water is:
a) 1 g/cm³
b) 1.5 g/cm³
c) 2 g/cm³
d) none of these (more…)
The lifespan of Red Blood Cells is ____ days.
a) 60
b) 120
c) 180
d) 240 (more…)
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