What is the scientific name for common salt?
(A) sodium sulfate
(B) sodium chloride
(C) sodium bicarbonate
(D) Ammonium chloride
The velocity of light is maximum in ______.
(A) Diamond
(B) Water
(C) Vacuum
(D) Glass
In which of the following industries is mica as a raw material?
(A) Cement
(B) Glass and Pottery
(C) Iron and Steel
(D) Electrical
Which of the following metals is known as coin metal?
(A) Copper
(B) Silver
(C) Gold
(D) All of the above
The best means of extinguishing petrol fires is-
(A) Baking Powder
(B) Carbon dioxide
(C) Sand
(D) Water
Which of the following is the hardest substance?
(A) Platinum
(B) Diamond
(C) Gold
(D) Silver
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