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Q.1)-The first metal used by man was
  • iron
  • copper
  • gold
  • bronze
Q.2)-The gas used for artificial ripening of green fruit is
  • ethylene
  • ethane
  • carbon dioxide
  • acetylene
Q.3)-The nucleus of an atom consists of
  • electrons and neutrons
  • electrons and protons
  • protons and neutrons
  • All of the above
Q.4)-The most electronegative element among the following is
  • sodium
  • bromine
  • fluorine
  • oxygen
Q.5)-The metal used to recover copper from a solution of copper sulphate is
  • Na
  • Ag
  • Hg
  • Fe
Q.6)-The metallurgical process in which a metal is obtained in a fused state is called
  • smelting
  • roasting
  • calcinations
  • froth floatation
Q.7)-The most commonly used bleaching agent is
  • alcohol
  • carbon dioxide
  • chlorine
  • sodium chlorine
Q.8)-The gas used in the manufacture of vanaspati from vegetable oil is
  • hydrogen
  • oxygen
  • nitrogen
  • carbon dioxide
Q.9)-The nucleus of a hydrogen atom consists of
  • 1 proton only
  • 1 proton + 2 neutron
  • 1 neutron only
  • 1 electron only
Q.10)-The heat required to raise the temperature of body by 1 K is called
  • specific heat
  • thermal capacity
  • water equivalent
  • None of the above