1. The difference between isotopes of an element is due to the presence of a different number of _______________.
[A]Neutrons
[B]Protons
[C]Photons
[D]Electrons
2. The ejection of electrons when a metal surface is irradiated is called?
[A]Atomic spectrum
[B]Photoelectric effect
[C]Zeeman effect
[D]Black body radiation
3. Which was the first metal used by man?
[A]Aluminium
[B]Silver
[C]Copper
[D]Iron
4. Which gas is used in the manufacture of vanaspati from vegetable oil?
[A]Oxygen
[B]Hydrogen
[C]Carbon dioxide
[D]Nitrogen
5. The electron affinity for the inert gases is ___________.
[A]Negative
[B]Zero
[C]High
[D]Positive
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