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GS Paper IUPSC Prelims 2013
Pollution & Environmental Laws
Question No. 91Interactive Test Mode
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+2-0.66

Q91. Due to improper/indiscriminate disposal of hold and used computers or their parts, which of the following are released into the environment as e-waste? 1. Beryllium 2. Cadmium 3. Chromium 4. Heptachlor 5. Mercury 6. Lead 7. Plutonium Select the correct answer using the codes given below:

Due to improper/indiscriminate disposal of hold and used computers or their parts, which of the following are released into the environment as e-waste?

  1. Beryllium
  2. Cadmium
  3. Chromium
  4. Heptachlor
  5. Mercury
  6. Lead
  7. Plutonium Select the correct answer using the codes given below:
Select the correct option below (or cross out options to eliminate)
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Official Answer Key & Detailed Solution

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Official UPSC Answer KeyUPSC Prelims 2013 • Environment and Ecology

Correct Answer: Option (B) — 1, 2, 3, 5 and 6 only

Concept & Option Breakdown

Standard Reference Verified
  • Beryllium (1), Cadmium (2), Chromium (3), Mercury (5), and Lead (6) are standard components in computer electronics:
    • Lead: Solder, CRTs, glass panels
    • Cadmium: Semiconductors, SMD chip resistors
    • Chromium: Galvanized steel corrosion protection
    • Mercury: Switches, relays, backlighting
    • Beryllium: Motherboards and connectors
  • Heptachlor (4) is a persistent organochlorine pesticide, not an electronic component.
  • Plutonium (7) is a fissile nuclear element used in atomic energy and weapons, not present in commercial computers.
Elimination Heuristic & Exam Approach

Plutonium is a radioactive nuclear material not used in commercial home computers. Heptachlor is an insecticide. Eliminating 4 and 7 immediately isolates option (b).

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2013 (Q91)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicEnvironment and Ecology → Pollution & Environmental Laws
Official Answer KeyOption (B) — 1, 2, 3, 5 and 6 only

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Frequently Asked Questions — UPSC Prelims 2013 Q91

What is the official answer for UPSC Prelims 2013 GS Paper I Question 91 (Environment and Ecology)?

The official UPSC answer key for this 2013 Environment and Ecology (Pollution & Environmental Laws) question is Option (B): "1, 2, 3, 5 and 6 only". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2013 question belong to?

This question belongs to GS Paper I under the subject "Environment and Ecology" and micro-topic "Pollution & Environmental Laws". You can explore all repeated questions from Pollution & Environmental Laws in Acme AI's 3D Prelims PYQ Realm or practice 50 full-length and sectional tests in the APT Prelims Test Series.

How can I solve this Pollution & Environmental Laws UPSC Prelims question using option elimination?

Plutonium is a radioactive nuclear material not used in commercial home computers. Heptachlor is an insecticide. Eliminating 4 and 7 immediately isolates option (b).

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Previous QuestionWhich of the following can be found as pollutants in the drinking water in some parts of India? 1. Arsenic 2. Sorbitol 3. Fluoride 4. Formaldehyde 5. Uranium Select the correct answer using the codes given below.
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