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Q:

Which of the following is added to iron to make iron hard and strong?

A) Zinc B) Copper
C) Carbon D) Sodium
 
Answer & Explanation Answer: C) Carbon

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Q:

Which of the following elements was the last element in Newland's Law of Octaves?

A) Thorium B) Hydrogen
C) Rubidium D) Bromine
 
Answer & Explanation Answer: A) Thorium

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Q:

Ice floats on water because its density is

A) more than water B) zero
C) less than water D) same as water
 
Answer & Explanation Answer: C) less than water

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Q:

Which of the following metals reacts vigorously with cold water?

A) Potassium B) Aluminium
C) Zinc D) Iron
 
Answer & Explanation Answer: A) Potassium

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Q:

One should use porcelain and not metal containers in a microwave oven because..

A) Charge may accumulate on the metal surface and there is danger of getting a shock B) Porcelain vessels are better conductors of heat and thus food gets cooked quickly
C) Metal containers might undergo chemical reaction leading to spoilage of food D) Porcelain vessels are cheaper than the metal containers
 
Answer & Explanation Answer: A) Charge may accumulate on the metal surface and there is danger of getting a shock

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Q:

Which of the following is the most common kidney stone-forming compound?

A) Calcium oxalate B) Magnesium oxide
C) Sodium bicarbonate D) Magnesium citrate
 
Answer & Explanation Answer: A) Calcium oxalate

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Q:

Which of the following causes damage to bridges, iron railings and all objects made of metals?

A) Reduction B) Rancidity
C) Acidity D) Corrosion
 
Answer & Explanation Answer: D) Corrosion

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Q:

Alkali metals are assigned which group in the Modern Periodic Table?

A) Second group B) Eighteenth group
C) Third group D) First group
 
Answer & Explanation Answer: D) First group

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