56.

Bell metal is an alloy of
A. nickel and copper B. zinc and copper
C. brass and nickel D. tin and copper
Answer and Explanation
Answer:D
Explanation: No answer description available for this question.
57.

Which of the following is not an isotope of hydrogen?
A. Tritium B. Deuterium
C. Protium D. Yttrium
Answer and Explanation
Answer:D
Explanation: http://en.wikipedia.org/wiki/Isotopes_of_hydrogen
58.

The main constituents of pearls are
A. calcium oxide and ammonium chloride B. calcium carbonate and magnesium carbonate
C. aragonite and conchiolin D. ammonium sulphate and sodium carbonate
Answer and Explanation
Answer:B
Explanation: No answer description available for this question.
59.

Amalgams are
A. highly coloured alloys B. alloys which contain mercury as one of the contents
C. alloys which have great resistance to abrasion D. alloys which contain carbon
Answer and Explanation
Answer:B
Explanation: No answer description available for this question.
60.

Potassium Permanganate is used for purifying drinking water, because
A. it is a sterilising agent B. it dissolves the impurities of water
C. it is a reducing agent D. it is an oxidising agent
Answer and Explanation
Answer:D
Explanation: No answer description available for this question.