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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.325·Miscellaneous·2025·Easy

P is the brother of Q and R. S is R's mother. T is P's father. How many of the following statements are definitely true? 1. S and T are a couple. II. Qis T's son. III. T is Q's father. IV. S is P's mother. V. R is T's daughter. VI. P is S's son. Select the correct answer using the code given below:

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Q.326·Miscellaneous·2025·Easy

If the length of a copper wire is increased by twice, then its resistivity will be

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Q.327·Miscellaneous·2025·Easy

A current through a horizontal power line flows in east to west direction. What will be the direction of magnetic field at a point directly below it when viewed from east end?

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Q.328·Miscellaneous·2025·Easy

If the speed of light in carbon disulfide and vacuum is X and Y respectively, then

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Q.329·Miscellaneous·2025·Easy

With reference to India, consider the following: I. The Inter-State Council II. The National Security Council III. Zonal Councils How many of the above were established as per the provisions of the Constitution of India?With reference to India,

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Q.330·Miscellaneous·2025·Easy

If NO is coded as 210, NOT is coded as 4200 and NOTE is coded as 21000, then how is NOTES coded?

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Q.331·Miscellaneous·2025·Easy

A single number for inflation is an aggregate across different commodities and services - the price rise differs for different items of consumption. So, the single number is arrived at by assigning weights to different commodities and services. For WPI, the weights in production are used; for CPI, the consumption basket is used. But people are not homogeneous.The consumption basket is vastly different for the poor, the middle classes, and the rich, Hence, the CPI is different for each of these classes and a composite index requires averaging the baskets. Which one of the following statements best reflects the most logical, rational and crucial message conveyed by the passage?

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Q.332·Miscellaneous·2025·Easy

Let P = QQQ be a 3-digit number. What is the HCF of P and 481?

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Q.333·Miscellaneous·2025·Easy

What is the 489th digit in the number 123456789101112...?

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Q.334·Miscellaneous·2025·Easy

Which one among the following elements is known to be discovered the earliest?

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Q.335·Miscellaneous·2025·Easy

A system that does NOT allow exchange of heat with its surrounding is called

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Q.336·Miscellaneous·2025·Easy

If n is a natural number, then what is the number of distinct remainders of (1^n+2^n) when divided by 4?

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Q.337·Miscellaneous·2025·Easy

In only 50 years, the world's consumption of raw materials has nearly quadrupled, to more than 100 billion tons. Less than 9% of this is reused. Batteries of old vehicles contain materials such as lithium, cobalt, manganese and nickel that are pricey and can be hard to obtain. Supply chains are long and complicated. Buyers' risks are being aggravated by their suppliers' poor environmental and labour standards. Reusing materials makes sense. Once batteries reach the ends of their lives, they should go back to a factory where their ingredients can be recovered and put into new batteries. Which one of the following statements best reflects the most logical, rational and pragmatic message conveyed by the passage?

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Q.338·Miscellaneous·2025·Easy

What happens when the sunlight travels through the Earth’s atmosphere?

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Q.339·Miscellaneous·2025·Easy

When a solid body is partially or completely immersed in a fluid, the fluid exerts an upward force on the body. The magnitude of the force is equal to 1. the mass of the body 2. the weight of the displaced fluid by the body Which of the above is/are correct?

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Q.340·Miscellaneous·2025·Easy

A mobile phone has been stolen. There are 3 suspects P, Q and R. They were questioned knowing that only one of them is guilty. Their responses are as follows: P : I did not steal. Q stole it. Q : R did not steal. I did not steal. R : I did not steal. I do not know who did it. Who stole the mobile phone?

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Q.341·Miscellaneous·2025·Easy

When a light ray passes through from air to water with a non-zero angle the ray will be

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Q.342·Miscellaneous·2025·Easy

Trust stands commonly defined as being vulnerable to others. Entrepreneurship implies trust in others and willingness to expose oneself to betrayal. Trusts in expert systems is the essence of globalizing behaviour; trust itself emerges as a super- commodity in a social market and defines the characteristics of goods and services in a global market. Trusting conduct also means holding others in good esteem, and an optimism that they, are or will be, competent in certain respects. Which one of the following statements best reflects the crux of the passage?

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