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Q) Which acid is used in car batteries?
Correct Answer - Option
(A)
Explanation:
Car batteries contain diluted sulphuric acid, which reacts with lead plates to produce electrical energy.
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Q) Which of the following is used to bleach clothes?
Correct Answer - Option
(B)
Explanation:
Chlorine acts as a bleaching agent by oxidizing stains and removing color from fabrics.
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Q) Which metal is most abundant in the Earth's crust?
Correct Answer - Option
(B)
Explanation:
Aluminium is the most abundant metal in the Earth's crust, found mainly in the form of bauxite ore.
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Q) Which chemical is used to preserve biological specimens?
Correct Answer - Option
(A)
Explanation:
Formalin, a solution of formaldehyde in water, is used to preserve biological specimens by preventing decay.
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Q) Which of the following elements has the lowest atomic mass?
Correct Answer - Option
(B)
Explanation:
Hydrogen has the lowest atomic mass of all elements, with an atomic mass of approximately 1.
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Q) What is the process of coating iron with zinc called?
Correct Answer - Option
(B)
Explanation:
Galvanization involves coating iron or steel with zinc to prevent rusting and corrosion.
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Q) Which of the following gases turns lime water milky?
Correct Answer - Option
(B)
Explanation:
Carbon dioxide reacts with lime water (calcium hydroxide) to form calcium carbonate, which makes the solution appear milky.
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Q) Which metal is used for making filaments in electric bulbs?
Correct Answer - Option
(B)
Explanation:
Tungsten has a very high melting point, making it ideal for use in bulb filaments.
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Q) Which of the following is used as an antifreeze in automobile radiators?
Correct Answer - Option
(B)
Explanation:
Ethylene glycol lowers the freezing point of water and prevents the radiator fluid from freezing in cold weather.
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Q) Which vitamin is synthesized by the human body when exposed to sunlight?
Correct Answer - Option
(D)
Explanation:
The human skin synthesizes Vitamin D when exposed to sunlight, specifically UV rays.
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