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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.4231·Miscellaneous·2021·Easy

Which of the following pairs of physical phenomenon and the discoverer is/are correctly matched? 1.James Chadwick : Photoelectric effect 2.Albert Einstein : Neutron 3.Marie Curie : Radium Select the correct answer using the code given below:

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Q.4232·Miscellaneous·2021·Easy

LED (a semi-conductor device) is an abbreviation that stands for

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Q.4233·Miscellaneous·2021·Easy

The statement "friction force is a contact force while magnetic force is a non-contact force" is

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Q.4234·Miscellaneous·2021·Easy

Which one of the following is the chemical formula of Hypobromous acid?

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Q.4235·Miscellaneous·2021·Easy

The composition of gases in exosphere is

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Q.4236·Miscellaneous·2021·Easy

In electrolytic refining of copper, the electrolyte is a solution of

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Q.4237·Miscellaneous·2021·Easy

Solder is an alloy of

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Q.4238·Miscellaneous·2021·Easy

Which of the following sets of elements has the same valency?

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Q.4239·Miscellaneous·2021·Easy

Which one of the following is the lowest possible temperature?

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Q.4240·Miscellaneous·2021·Easy

Numerically two thermometers, one in Fahrenheit scale and another in Celsius scale shall read same at

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Q.4241·Miscellaneous·2021·Easy

The image we see in plane mirror is

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Q.4242·Miscellaneous·2021·Easy

Which one of the following colours may be obtained by combining green and red colours?

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Q.4243·Miscellaneous·2021·Easy

Which of the following are the primary colours of light?

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Q.4244·Miscellaneous·2021·Easy

In this question each item consists of a sentence with an underlined word followed by four words. Select the option that is nearest in meaning to the underlined word and mark your response in your Answer Sheet accordingly. The sardonic nature of her stories made her stand out among the contemporary writers.

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Q.4245·Miscellaneous·2021·Easy

The third term of a GP is 3. What is the product of its first five terms?

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Q.4246·Miscellaneous·2021·Easy

The element in the i th row and the j th column of a determinant of third order is equal to 2(i + j). What is the value of the determinant?

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Q.4247·Miscellaneous·2021·Easy

With the numbers 2, 4, 6, 8, all the possible determinants with these four different elements are constructed. What is the sum of the values of all such determinants?

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Q.4248·Miscellaneous·2021·Easy

A parallelogram has three consecutive vertices (–3, 4), (0, –4) and (5, 2). The fourth vertex is

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