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.
Which of the following is not related to a.m.u
A. gram
B. kilogram
C. microgram
D. gram/lit
Show Answer…...Hide AnswerCorrect Answer: D. gram/lit
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All of the following statements are incorrect except
A. precision and accuracy should go side by side in a scientific work
B. scientific work must be precise, accuracy is not essential
C. scientific work must be accurate, precision is not essential
D. calculations must be made before any experiment
Show Answer…...Hide AnswerCorrect Answer: A. precision and accuracy should go side by side in a scientific work
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Empirical formula and formula unit of an ionic compound
A. are always similar
B. are always different
C. may be similar or different
D. ionic compounds don’t’ have any empirical formula
Show Answer…...Hide AnswerCorrect Answer: C. may be similar or different
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Copper (II) oxide is mixed with organic compound during combustion analysis. The purpose is
A. to carry out complete combustion
B. to reduce the economy of the process
C. to reduce the time for completion of the reaction
D. all of the above
Show Answer…...Hide AnswerCorrect Answer: A. to carry out complete combustion
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Bismark brown is a dye. Its molar mass is 228.3 g/mol. When the dye was analyzed by a scientist, it was found that it contains 30.68% nitrogen. How many nitrogen atoms are there in each Bismark brown molecule?
A. 6
B. 5
C. 4
D. 3
Show Answer…...Hide AnswerCorrect Answer: B. 5
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The mass of 2 mole of sodium hydroxide will be
A. 2 g
B. 20 g
C. 40 g
D. 80 g
Show Answer…...Hide AnswerCorrect Answer: D. 80 g
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“A” compound is always consists of the same elements combined in the same fixed ratio”. The statement is
A. a hypothesis
B. a fact
C. a law
D. an observation
Show Answer…...Hide AnswerCorrect Answer: C. a law
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