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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.4015·Miscellaneous·2021·Easy

The coordinates of three consecutive vertices of a parallelogram ABCD are A(1, 3), B(–1, 2) and C(3, 5). What is the equation of the diagonal BD?

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Q.4016·Miscellaneous·2021·Easy

The coordinates of three consecutive vertices of a parallelogram ABCD are A(1, 3), B(–1, 2) and C(3, 5). What is the area of the parallelogram?

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Q.4017·Miscellaneous·2021·Easy

The equations of the sides AB, BC and CA of a triangle ABC are x – 2 = 0, y + 1 = 0 and x + 2y – 4 = 0 respectively. What is the equation of the altitude through B on AC?

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Q.4018·Miscellaneous·2021·Easy

How many distinct matrices exist with all four entries taken from {1, 2}?

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Q.4019·Miscellaneous·2021·Easy

Shoots of plant show upward movement and it can be designated to be

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Q.4020·Miscellaneous·2021·Easy

Which one of the following statements about the process of photosynthesis is correct?

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Q.4021·Miscellaneous·2021·Easy

Identify the correct reason, out of the following, about Claire Polosak for being in the news:

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Q.4022·Miscellaneous·2021·Easy

If x, y, z are in GP, then which of the following is/are correct? 1. ln(3x), ln(3y), ln(3z) are in AP 2. xyz + ln(x), xyz + ln(y), xyz + ln(z) are in HP Select the correct answer using the code given below.

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Q.4023·Miscellaneous·2021·Easy

Let S = {2, 3, 4, 5, 6, 7, 9}. How many different 3-digit numbers (with all digits different) from S can be made which are less than 500?

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Q.4024·Miscellaneous·2021·Easy

If 1/(b + c), 1/(c + a), 1/(a + b) are in HP, then which of the following is/are correct? 1. a, b, c are in AP 2. (b + c)², (c + a)², (a + b)² are in GP Select the correct answer using the code given below.

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Q.4025·Miscellaneous·2021·Easy

If | a – b a – b – c | | b a + b – c | = kabc = 0 | –a – b –a – b + c | (a ≠ 0, b ≠ 0, c ≠ 0) then what is the value of k?

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Q.4026·Miscellaneous·2021·Easy

How are evergreen plants with woody stems having naked seed classified?

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Q.4027·Miscellaneous·2021·Easy

Which one of the following pairs of elements is liquid at room temperature and at normal pressure?

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Q.4028·Miscellaneous·2021·Easy

Which one of the following tissues is known as basic packing tissue and found in xylem and phloem?

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Q.4029·Miscellaneous·2021·Easy

Girth of stem of a plant increases due to division of cells in

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Q.4030·Miscellaneous·2021·Easy

Different varieties of the same gene are called

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Q.4031·Miscellaneous·2021·Easy

The pH value of Milk of Magnesia is approximately

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Q.4032·Miscellaneous·2021·Easy

Which one of the following viruses used to be responsible for highly infectious disease Smallpox?

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