1000 Best General Science MCQ-Questions
Q57). Which of the following is not an isotope of hydrogen?
a).Tritium
b).Deuterium
c).Protium
d).Yttrium
Correct Answer:
Yttrium
Explanation:
Q58). 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
Correct Answer:
calcium carbonate and magnesium carbonate
Explanation:
Q59). 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
Correct Answer:
alloys which contain mercury as one of the contents
Explanation:
Q60). Which of the following is the lightest metal?
a).Mercury
b).Lithium
c).Lead
d).Silver
Correct Answer:
Lithium
Explanation:
Q61). Which of the following metals remain in liquid for under normal conditions?
a).Radium
b).Zinc
c).Uranium
d).Mercury
Correct Answer:
Mercury
Explanation:
Q62). 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
Correct Answer:
it is an oxidising agent
Explanation:
Q63). Which of the following is an element?
a).Ruby
b).Sapphire
c).Emerald
d).Diamond
Correct Answer:
Diamond
Explanation:
Q64). What is the unit for measuring the amplitude of a sound?
a).Decibel
b).Coulomb
c).Hum
d).Cycles
Correct Answer:
Decibel
Explanation: