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Science & Technology

923 questions asked in UPSC Prelims.

2001 · Q46Science & TechnologyScience & Technology Institutionsmoderate

Match List I with List II and select the correct answer using the codes given below the Lists: List I (Institute) I. Central Institute of Medicinal and Aromatic Plants II. Centre for DNA Finger Printing and Diagnostics III. Institute of Microbial Technology IV. National Institute of Immunology List II (Location) A) Chandigarh B) Hyderabad C) New Delhi D) Lucknow

  1. (a)I-B, II-D, III-A, IV-C
  2. (b)I-D, II-B, III-A, IV-C
  3. (c)I-B, II-D, III-C, IV-A
  4. (d)I-D, II-B, III-C, IV-A
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Official answer(b) I-D, II-B, III-A, IV-C

2001 · Q101Science & TechnologyPhysicsmoderate

Assertion (A): A stick is dipped in water in a slanting position. If observed sideways, the stick appears short and bent at the surface of water. Reason (R): The light coming from the stick undergoes scattering from water molecules giving the stick a short and bent appearance.

  1. (a)Both A and R are individually true and R is the correct explanation of A
  2. (b)Both A and R are individually true but R is NOT a correct explanation of A
  3. (c)A is true but R is false
  4. (d)A is false but R is true
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Official answer(c) A is true but R is false

2001 · Q102Science & TechnologyPhysicsmoderate

Assertion (A): A piece of copper and a piece of glass are heated to the same temperature. When touched, thereafter, the copper piece appears hotter than the glass piece. Reason (R): The density of copper is more than that of glass.

  1. (a)Both A and R are individually true and R is the correct explanation of A
  2. (b)Both A and R are individually true but R is NOT a correct explanation of A
  3. (c)A is true but R is false
  4. (d)A is false but R is true
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Official answer(c) A is true but R is false

2001 · Q106Science & TechnologyEnergy & Environmentmoderate

Consider the following statements: In a nuclear reactor, self-sustained chain reaction is possible, because I. More neutrons are released in each of the fission reactions. II. The neutrons immediately take part in the fission process. III. The fast neutrons are slowed down by Graphite. IV. Every neutron released in the fission reaction initiates further fission. Which of these statements are correct?

  1. (a)I, II and III
  2. (b)I and III
  3. (c)II and IV
  4. (d)II, III and IV
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Official answer(b) I and III

2001 · Q110Science & TechnologyPhysicsmoderate

Consider the following statements: A simple pendulum is set into oscillation. Then I. The acceleration is zero when the bob passes through the mean position. II. In each cycle the bob attains a given velocity twice. III. Both acceleration and velocity of the bob are zero when it reaches its extreme position during its oscillation. IV. The amplitude of oscillation of the simple pendulum decreases with time. Which of these statements are correct?

  1. (a)I and II
  2. (b)III and IV
  3. (c)I, II and IV
  4. (d)II, III and IV
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Official answer(c) I, II and IV

2001 · Q116Science & TechnologyChemistryeasy

Assertion (A): A chemical reaction becomes faster at higher temperatures. Reason (R): At higher temperatures, molecular motion becomes more rapid. Which of the following is correct?

  1. (a)Both A and R are individually true and R is the correct explanation of A
  2. (b)Both A and R are individually true but R is NOT a correct explanation of A
  3. (c)A is true but R is false
  4. (d)A is false but R is true
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Official answer(a) Both A and R are individually true and R is the correct explanation of A

2001 · Q121Science & TechnologyChemistrymoderate

Consider the following statements with reference to the Periodic Table of chemical elements: I. Ionisation potential gradually decreases along a period. II. In a group of elements, electron affinity decreases as the atomic weight increases. III. In a given period, electronegativity decreases as the atomic number increases. Which of these statement(s) is/are correct?

  1. (a)I only
  2. (b)II only
  3. (c)I and III
  4. (d)II and III
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Official answer(b) II only