CSS OPTIONAL SUBJECTS MCQs

Here, you may find CSS Optional Subjects MCQs. If you want to prepare MCQs of optional subjects, CSS MCQs platform is here to serve you while preparing your MCQs portion of your CSS Exam. Please practice these CSS Optional Subjects MCQs on a daily basis.

The volume of one kilogram of water at 4°C is equal to one litre. The temperature of water is kept at 4°C because water

A. has no dissolved gasses at this temperature
B. has maximum density at this temperature
C. polarity of water molecule is least at this temperature
D. dipole moment has maximum value at this temperature

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Correct Answer: B. has maximum density at this temperature
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A piece of paper is burnt in air, the gas produced is passed through distilled water. The PH of water solution will be

A. 1
B. 7
C. 2.1
D. 6.8

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Correct Answer: D. 6.8
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A student subtracted 0.00055 from 10.2345678 and reported the result as 10.23401. But his friend told him that the result was wrong. What is the correct result?

A. 10.234017
B. 10.2340178
C. 10.234
D. 10.23

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Correct Answer: D. 10.23
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The following statement contained in a student’s laboratory report is a conclusion.

A. a gas is liberated
B. colour of the gas is greenish yellow
C. oxide of the gas is strongly acidic
D. the gas is chlorine

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Correct Answer: D. the gas is chlorine
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A 50.00 mL sample of a cough mixture prepared by a pharmacist was found to have a mass of 46.0g. what is the density (in g/mL) of this mixture. Stated to the correct number of significant figures?

A. 0.92
B. 0.920
C. 0.9200
D. 1.087

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Correct Answer: B. 0.920
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Tobacco contains a poisonous alkaloid called Nicotine. The molecular formula of nicotine is C10H14N2 (molar mass = 162.23g). The mass percentage of nitrogen in nicotine, is?

A. 4.32%
B. 8.23%
C. 12.4%
D. 17.3%

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Correct Answer: D. 17.3%
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