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Question No. 156Interactive Test Mode
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Q156. In a pressure cooker, the temperature at which the food is cooked depends mainly upon which of the following? 1. Area of the hole in the lid 2. Temperature of the flame 3. Weight of the lid Select the correct answer using the code given below.

In a pressure cooker, the temperature at which the food is cooked depends mainly upon which of the following?

  1. Area of the hole in the lid
  2. Temperature of the flame
  3. Weight of the lid

Select the correct answer using the code given below.

Select the correct option below (or cross out options to eliminate)

Official Answer Key & Detailed Solution

Ready to check the official UPSC Answer Key?

Click any option above to test yourself under exam conditions, or reveal the explanation directly.

Official UPSC Answer KeyUPSC Prelims 2021 • Science and Technology

Correct Answer: Option (C) — 1 and 3 only

Concept & Option Breakdown

Standard Reference Verified

Statements 1 and 3 are correct, while Statement 2 is incorrect:

  • Statement 1 is correct: The area of the vent hole affects the pressure equilibrium; pressure determines the boiling point and thus the maximum operating temperature.
  • Statement 2 is incorrect: Increasing the flame temperature increases the rate of heating, but once the cooker reaches operating pressure, excess heat simply vents additional steam without raising the internal equilibrium temperature.
  • Statement 3 is correct: The weight of the pressure regulator on the lid determines the threshold internal pressure required to lift the valve, which directly dictates the boiling temperature of water inside.
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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2021 (Q156)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (C) — 1 and 3 only

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Frequently Asked Questions — UPSC Prelims 2021 Q156

What is the official answer for UPSC Prelims 2021 GS Paper I Question 156 (Science and Technology)?

The official UPSC answer key for this 2021 Science and Technology (Health & Medicine) question is Option (C): "1 and 3 only". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2021 question belong to?

This question belongs to GS Paper I under the subject "Science and Technology" and micro-topic "Health & Medicine". You can explore all repeated questions from Health & Medicine 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 Health & Medicine UPSC Prelims question using option elimination?

To solve Health & Medicine questions in UPSC Prelims, identify extreme modifiers, verify core NCERT conceptual definitions, and eliminate mutually contradictory statement pairs before locking your final option.

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