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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.6913·Miscellaneous·2018·Easy

Which one of the following depicts the correct circuit of a reflex arc?

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Q.6914·Miscellaneous·2018·Easy

If one set of chromosomes for a given plant is represented as N; in case of double fertilization, the zygote and the endosperm nucleus of a diploid plant would have how many sets of chromosomes respectively?

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Q.6915·Miscellaneous·2018·Easy

Consider the following circuit : Which one of the following is the value of the resistance between points A and B in the circuit given above?

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Q.6916·Miscellaneous·2018·Easy

The absolute zero temperature is 0 Kelvin. In °C unit, which one of the following is the absolute zero temperature?

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Q.6917·Miscellaneous·2018·Easy

Consider the following statements about visible light, UV light and X-rays : 1. The wavelength of visible light is more than that of X-rays. 2. The energy of X-ray photons is higher than that of UV light photons. 3. The energy of UV light photons is less than that of visible light photons. Which of the statements given above is/are correct?

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Q.6918·Miscellaneous·2018·Easy

The time period of oscillation of a simple pendulum having length L and mass of the bob m is given as T. If the length of the pendulum is increased to 4L and the mass of the bob is increased to 2m, then which one of the following is the new time period of oscillation?

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Q.6919·Miscellaneous·2018·Easy

The connecting cable of electrical appliances like electric iron, water heater or room heater contains three insulated copper wires of three different colours—red, green and black. Which one of the following is the correct colour code?

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Q.6920·Miscellaneous·2018·Easy

The graphs between current (I) and voltage (V) for three linear resistors 1, 2 and 3 are given below : If R₁, R₂ and R₃ are the resistances of these resistors, then which one of the following is correct?

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Q.6921·Miscellaneous·2018·Easy

Consider the following statements about a microscope and a telescope : 1. Both the eyepiece and the objective of a microscope are convex lenses. 2. The focal length of the objective of a telescope is larger than the focal length of its eyepiece. 3. The magnification of a telescope increases with the increase in focal length of its objective. 4. The magnification of a microscope increases with the increase in focal length of its objective. Which of the statements given above are correct?

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Q.6922·Miscellaneous·2018·Easy

In this question there are some idioms/phrases followed by four alternative meanings to each. Choose the response (a), (b), (c) or (d) which is the most appropriate meaning and mark your response on the Answer Sheet accordingly. To be in a fix

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Q.6923·Miscellaneous·2018·Easy

In this question there are some idioms/phrases followed by four alternative meanings to each. Choose the response (a), (b), (c) or (d) which is the most appropriate meaning and mark your response on the Answer Sheet accordingly. To fish in troubled waters

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Q.6924·Miscellaneous·2018·Easy

In this question consists of 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 rearrange the jumbled parts of the sentence and mark your response on the Answer Sheet accordingly. Domestic fires in Indian villages P. as the heat is dispersed Q. an unhealthy smoke accumulates in unventilated houses R. are wasteful S. lit in Chulhas The correct sequence should be

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Q.6925·Miscellaneous·2018·Easy

In this question consists of 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 rearrange the jumbled parts of the sentence and mark your response on the Answer Sheet accordingly. Bold rocks near at hand P. makes a fine forest for the imagination Q. than distant Alps R. are more inspiring S. and the thick fern upon a heath The correct sequence should be

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Q.6926·Miscellaneous·2018·Easy

In this question consists of 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 rearrange the jumbled parts of the sentence and mark your response on the Answer Sheet accordingly. Newton discovered that P. due to the gravitational pull Q. of the earth R. the apple falls S. on the ground The correct sequence should be

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Q.6927·Miscellaneous·2018·Easy

In this question consists of 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 rearrange the jumbled parts of the sentence and mark your response on the Answer Sheet accordingly. The knocking P. were still in the house Q. for some time R. although the echoes of it S. ceased The correct sequence should be

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Q.6928·Miscellaneous·2018·Easy

In this question consists of 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 rearrange the jumbled parts of the sentence and mark your response on the Answer Sheet accordingly. The history of mankind is P. and steady progress Q. continuous change R. the history of S. from barbarism to refinement The correct sequence should be

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Q.6929·Miscellaneous·2018·Easy

What is the determinant of the matrix | x x+y z | | z x x+z | | y z+x y |

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Q.6930·Miscellaneous·2018·Easy

If A, B and C are the angles of a triangle and | 1 1 1 | | 1+sinA 1+sinB 1+sinC | | sinA+sin^2A sinB+sin^2B sinC+sin^2C | = 0, then which one of the following is correct?

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