311: Which one of the following countries is planning to construct a rival to the Panama Canal to link the Pacific and Atlantic oceans ?
(a) Colombia
(b) Costa Rica
(c) Nicaragua
(d) Guatemala
312: Atoms of the same element having the same atomic number but different atomic weight are called
(a) Isobars
(b) Isotopes
(c) Polymers
(d) Isomers
313: The production of cultured pearls is an important cottage industry of
(a) Belgium
(b) West Indies
(c) New Zealand
(d) Japan
314: The chemical name of 'Aspirin' is:
(a) Acetyl cynamide
(b) Acetyl salicylic acid
(c) Benzyl salicylate
(d) Tartaric acid
315: The working principle of a washing machine is
(a) centrifugation
(b) dialysis
(c) reverse osmosis
(d) diffusion