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Prelims

UPSC Prelims Questions

Practice UPSC Prelims MCQs by subject and year. Free questions with explanations for focused revision.

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  2. /Prelims Questions
Q.7111·Miscellaneous·2018·Easy

If A and B are two events such that 2P(A) = 3P(B), where 0 < P(A) < P(B) < 1, then which one of the following is correct ?

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Q.7112·Miscellaneous·2018·Easy

A box has ten chits numbered 0, 1, 2, 3, ..., 9. First, one chit is drawn at random and kept aside. From the remaining, a second chit is drawn at random. What is the probability that the second chit drawn is “9” ?

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Q.7113·Miscellaneous·2018·Easy

One bag contains 3 white and 2 black balls, another bag contains 5 white and 3 black balls. If a bag is chosen at random and a ball is drawn from it, what is the chance that it is white ?

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Q.7114·Miscellaneous·2018·Easy

Consider the following in respect of two events A and B : 1.P(A occurs but not B) = P(A) - P(B) if B ⊂ A 2.P(A alone or B alone occurs) = P(A) + P(B) - P(A ∩ B) 3.P(A ∪ B) = P(A) + P(B) if A and B are mutually exclusive Which of the above is/are correct ?

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Q.7115·Miscellaneous·2018·Easy

A committee of three has to be chosen from a group of 4 men and 5 women. If the selection is made at random, what is the probability that exactly two members are men ?

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Q.7116·Miscellaneous·2018·Easy

Which one of the following is NOT true for bleaching powder?

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Q.7117·Miscellaneous·2018·Easy

Which one of the following is NOT a tributary of Indus River?

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Q.7118·Miscellaneous·2018·Easy

AIDS is caused by a virus whose genetic material is

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Q.7119·Miscellaneous·2018·Easy

Which of the following statements about a fluid at rest in a cup is/are correct? 1.Pressure is same at all the points in the fluid. 2.Pressure is exerted on the walls. 3.Pressure exists everywhere in the fluid. Select the correct answer using the code given below:

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Q.7120·Miscellaneous·2018·Easy

Which one of the following devices is used to measure atmospheric pressure?

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Q.7121·Miscellaneous·2018·Easy

How is carbon black obtained?

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Q.7122·Miscellaneous·2018·Easy

Which one of the following properties is NOT true for graphite?

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Q.7123·Miscellaneous·2018·Easy

Which one of the following is the purest form of Carbon?

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Q.7124·Miscellaneous·2018·Easy

The poisonous nature of Carbon monoxide (CO) is due to its

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Q.7125·Miscellaneous·2018·Easy

Which one of the following elements is needed in the human body to transfer electrical signals by nerve cells?

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Q.7126·Miscellaneous·2018·Easy

Who among the following first discovered cell?

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Q.7127·Miscellaneous·2018·Easy

Which one of the following group of organisms forms a food chain?

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Q.7128·Miscellaneous·2018·Easy

Which one of the following is the value of 1 kWh of energy converted into joules?

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