The gas used for filling weather balloons is Helium




1.The gas used for filling weather balloons is
(a) Helium
(b) Air
(c) Nitrogen
(d) None of these

Ans.(a)

2.Milk tastes sour when it is left in open for some time. This happens due to the formation of
(a) Lactic acid
(b) Citric acid
(c) Acetic acid
(d) Carbonic acid

Ans.(a)

3. Galvanised iron is made by coating iron with
(a) Zinc
(b) Nickel
(c) Chromium
(d) Sulphur

Ans.(a)

4. ‘Milk of Magnesia’ is a suspension of:
(a) magnesium sulphate
(b) magnesium carbonate
(c) magnesium hydroxide
(d) magnesium chloride

Ans.(c)

5. Bauxite is an alloy of which of the following metals?
(a) Aluminium
(b) Silver
(c) Tin
(d) Iron

Ans.(a)

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