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Science & Technology

923 questions asked in UPSC Prelims.

2004 · Q72Science & TechnologyPhysicsmoderate

Assertion (A): In our houses, the current in AC electricity line changes direction 60 times per second. Reason (R): The frequency of alternating voltage supplied is 60 hertz.

  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 the 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

2004 · Q91Science & TechnologyScience & Technology Institutionsmoderate

Match List I (Institute) with List II (Located At) and select the correct answer using the codes given below: List I (A) Indian Institute of Geomagnetism (B) International Advanced Research Centre for Powder Metallurgy and New Materials (C) Salim Ali Centre for Ornithology and Natural History (D) Tropical Forestry Research Institutes List II 1. Coimbatore 2. Mumbai 3. Jabalpur 4. Hyderabad Codes: A B C D

  1. (a)2 3 1 4
  2. (b)1 4 2 3
  3. (c)2 4 1 3
  4. (d)1 3 2 4
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Official answer(c) 2 4 1 3

2004 · Q92Science & TechnologyEnergy & Environmentmoderate

Consider the following statements: 1. Indira Gandhi Centre for Atomic Research uses fast reactor technology. 2. Atomic Minerals Directorate for Research and Exploration is engaged in heavy water production. 3. Indian Rare Earths Limited is engaged in the manufacture of Zircon for India's nuclear programme beside other rare earth products. Which of these statements given above are correct?

  1. (a)1, 2 and 3
  2. (b)1 and 2
  3. (c)1 and 3
  4. (d)2 and 3
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Official answer(c) 1 and 3

2004 · Q125Science & TechnologyPhysicseasy

A spherical body moves with a uniform angular velocity ω around a circular path of radius r. Which one of the following statements is correct?

  1. (a)The body has no acceleration
  2. (b)The body has a radial acceleration ω²r directed towards the centre of the path
  3. (c)The body has a radial acceleration 2/5 ω²r directed away from the centre of the path
  4. (d)The body has an acceleration ω²r tangential to its path
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Official answer(b) The body has a radial acceleration ω²r directed towards the centre of the path