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
