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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.7615·Miscellaneous·2018·Easy

If the length of a side of a square is increased by 8 cm, its area increases by 120 square cm. What is the length of a side of the square?

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Q.7616·Miscellaneous·2018·Easy

What is the largest power of 10 that divides the product 1 × 2 × 3 × … × 25?

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Q.7617·Miscellaneous·2018·Easy

Walls (excluding their roofs and floors) of 5 identical rooms having length, breadth and height 6 m, 4 m and 2.5 m respectively are to be painted. Paints are available only in cans of 1 L and one litre of paint can be used for painting 20 square metres. What is the number of cans required for painting?

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Q.7618·Miscellaneous·2018·Easy

A cube of maximum volume (each corner touching the surface from inside) is cut from a sphere. What is the ratio of the volume of the cube to that of the sphere?

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Q.7619·Miscellaneous·2018·Easy

A car has an average speed of 60 km per hour while going from Delhi to Agra and has an average speed of y km per hour while returning to Delhi from Agra (by travelling the same distance). If the average speed of the car for the whole journey is 48 km per hour, then what is the value of y?

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Q.7620·Miscellaneous·2018·Easy

What angle does the hour hand of a clock describe in 10 minutes of time?

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Q.7621·Miscellaneous·2018·Easy

What is cot 1° cot 23° cot 45° cot 67° cot 89° equal to?

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Q.7622·Miscellaneous·2018·Easy

A man can row at a speed of x km/hr in still water. If in a stream which is flowing at a speed of y km/hr it takes him z hours to row to a place and back, then what is the distance between the two places?

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Q.7623·Miscellaneous·2018·Easy

5^17 + 5^18 + 5^19 + 5^20 is divisible by

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Q.7624·Miscellaneous·2018·Easy

If 2b = a + c and y^2 = xz, then what is x^b - y^c - z^b equal to?

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Q.7625·Miscellaneous·2018·Easy

If 65x - 33y = 97 and 33x - 65y = 1, then what is xy equal to?

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Q.7626·Miscellaneous·2018·Easy

Which one of the following is correct?

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Q.7627·Miscellaneous·2018·Easy

In this question their is a sentence the parts of which have been jumbled. These parts have been labelled P, Q, R and S. Given below each sentence are four sequences namely (a), (b), (c) and (d). You are required to re-arrange the jumbled parts of the sentence and mark your response accordingly. the British manufacturers(P) popularity of Indian textiles(Q) were jealous of the (R) from the very beginning (S)

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Q.7628·Miscellaneous·2018·Easy

1/25 of the students who registered did not appear for the examination, 11/20 of those who appeared passed. If the number of registered students is 2000, the number who passed is

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Q.7629·Miscellaneous·2018·Easy

What is the difference between 0.9 and 0.09?

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Q.7630·Miscellaneous·2018·Easy

If A : B = 1 : 2, B : C = 3 : 4, C : D = 2 : 3 and D : E = 3 : 4, then what is B : E equal to?

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Q.7631·Miscellaneous·2018·Easy

A work when done by 10 women is completed in 12 days. The same work can be completed in 8 days when done by 5 men. How many days will it take to complete when 6 women and 3 men are employed to perform the same job?

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Q.7632·Miscellaneous·2018·Easy

A man undertakes to do a certain work in 150 days. He employs 200 men. He finds that only a quarter of the work is done in 50 days. How many additional men should he employ so that the whole work is finished in time?

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