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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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Q.4105·Miscellaneous·2021·Easy

Consider the following statements in respect of sets: 1. The union over intersection of sets is distributive. 2. The complement of union of two sets is equal to intersection of their complements. 3. If the difference of two sets is equal to empty set, then the two sets must be equal. Which of the above statements are correct?

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Q.4106·Miscellaneous·2021·Easy

Consider three sets X, Y and Z having 6, 5 and 4 elements respectively. All these 15 elements are distinct. Let S = (X – Y) ∪ Z. How many proper subsets does S have?

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Q.4107·Miscellaneous·2021·Easy

Consider the following statements in respect of relations and functions : 1. All relations are functions but all functions are not relations. 2. A relation from A to B is a subset of Cartesian product A × B. 3. A relation in A is a subset of Cartesian product A × A. Which of the above statements are correct?

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Q.4108·Miscellaneous·2021·Easy

Let ABC be a triangle. If cos 2A + cos 2B + cos 2C = –1 then which one of the following is correct?

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Q.4109·Miscellaneous·2021·Easy

What is the value of the following determinant? | cos C tan A 0 | | sin B 0 –tan A | | 0 sin B cos C |

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Q.4110·Miscellaneous·2021·Easy

The pH value of Milk of Magnesia is approximately

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Q.4111·Miscellaneous·2021·Easy

Which one of the following compounds is used in 'black and white' photography?

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Q.4112·Miscellaneous·2021·Easy

What is the number of water molecules present in a Ferrous Sulphate crystal?

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Q.4113·Miscellaneous·2021·Easy

Which of the following statements about the first Indian Factory Act passed in 1881 is/are correct? 1. The Act dealt primarily with the problem of child labour. 2. The Act laid down that children between 7 years and 12 years of age would not work for more than 9 hours a day. Select the correct answer using the code given below:

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Q.4114·Miscellaneous·2021·Easy

The periodic rise and fall of ocean water in response to gravitational forces is called

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Q.4115·Miscellaneous·2021·Easy

Which one of the following is the longest parallel of latitude?

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Q.4116·Miscellaneous·2021·Easy

Which one of the following coalfields is not located in Jharkhand?

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Q.4117·Miscellaneous·2021·Easy

Which of the following pairs of crop and product is/are correctly matched? 1. Food crop : Ragi 2. Cash crop : Jute 3. Plantation crop : Coconut Select the correct answer using the code given below:

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Q.4118·Miscellaneous·2021·Easy

The Tropic of Cancer does not pass through which one of the following States?

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Q.4119·Miscellaneous·2021·Easy

In which one of the following years did the British demarcate a large area of land as Damin-i-koh for settling the Santhals?

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Q.4120·Miscellaneous·2021·Easy

Which one of the following statements about Tattvabodhini Patrika is correct?

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Q.4121·Miscellaneous·2021·Easy

Which of the following statements about the Deccan Riots Commission is/are correct? 1.The Commission did not hold enquiries in the districts which were not affected. 2.The Commission did record the statements of ryots, sahukars and eye-witnesses. Select the correct answer using the code given below:

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Q.4122·Miscellaneous·2021·Easy

What is the sum of deviations of the variate values 73, 85, 92, 105, 120 from their mean?

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