Acme Ai
A
अ
GS Paper IUPSC Prelims 2005
Health & Medicine
Question No. 216Interactive Test Mode
00:00
+2-0.66

Q216. Which one of the following is the correct sequence of the given substances in the decreasing order of their densities?

Which one of the following is the correct sequence of the given substances in the decreasing order of their densities?

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

Official Answer Key & Detailed Solution

3D PYQ Realm

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 2005 • Science and Technology

Correct Answer: Option (B) — Gold > Mercury > Steel

Concept & Option Breakdown

Standard Reference Verified

The approximate densities of the given materials are:

  • Gold: $\approx 19.3\text{ g/cm}^3$
  • Mercury: $\approx 13.6\text{ g/cm}^3$
  • Steel: $\approx 7.8\text{ g/cm}^3$ Thus, the decreasing order is Gold > Mercury > Steel.
Elimination Heuristic & Exam Approach

Iron/Steel floats on mercury, meaning mercury is denser than steel. Gold sinks heavily in mercury, meaning gold is denser than mercury.

Reviewed by Avinash Sir & Acme AI Research Team

Practice Full-Length & Sectional Prelims Mocks on this Interface

50 simulated tests in the APT Prelims Test Series (₹1,493) or 1-on-1 Mentorship with Avinash Sir.

1-on-1 MentorshipOpen Test Platform

Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2005 (Q216)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (B) — Gold > Mercury > Steel

Related & Repeated Prelims PYQs (1)

Questions from other UPSC Prelims years testing the same or closely linked concept.

View Cluster in 3D Graph
2008 • Q31682% Match

Which one of the following pairs of metals constitutes the lightest metal and the heaviest metal, respectively?

Science and Technology • Health & MedicineSolve

More PYQs from Science and Technology (Health & Medicine)

Master the Science and Technology syllabus cluster by practicing these related previous year questions.

View All Science and Technology PYQs
2007 • Q213Health & Medicine

Four wires of the same material and of dimensions as under are stretched by a load of the same magnitude separately. Which one of them will be elongat

Science and TechnologyPractice
2007 • Q214Health & Medicine

Three identical vessels A, B and C are filled with water, mercury and kerosene respectively up to an equal height. The three vessels are provided with

Science and TechnologyPractice
2006 • Q215Health & Medicine

What is the approximate mean velocity with which the earth moves round the sun in its orbit?

Science and TechnologyPractice
2004 • Q217Health & Medicine

A car is running on a road at a uniform speed of 60 km/h. The net resultant force on the car is:

Science and TechnologyPractice
2004 • Q218Health & Medicine

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?

Science and TechnologyPractice
2004 • Q219Health & Medicine

A weightless rubber balloon is filled with 200 cc of water. Its weight in water is equal to:

Science and TechnologyPractice
2003 • Q220Health & Medicine

Assertion (A): The weight of a body decreases with the increase of altitude on earth. Reason (R): The earth is not a perfect sphere. Codes:

Science and TechnologyPractice
2003 • Q221Health & Medicine

Consider the following statements: A 4-wheel vehicle moving in a sharp circular path at high speed will: 1. Overturn about its outer wheels 2. Overtur

Science and TechnologyPractice

Frequently Asked Questions — UPSC Prelims 2005 Q216

What is the official answer for UPSC Prelims 2005 GS Paper I Question 216 (Science and Technology)?

The official UPSC answer key for this 2005 Science and Technology (Health & Medicine) question is Option (B): "Gold > Mercury > Steel". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2005 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?

Iron/Steel floats on mercury, meaning mercury is denser than steel. Gold sinks heavily in mercury, meaning gold is denser than mercury.

Beyond Previous Year Questions

Structured Prelims Practice & Mentorship

Pair previous year question analysis with full-length simulated mock tests and 1-on-1 faculty guidance.

APT 2027 • 50 Prelims Tests17% OFF

Acme Prelims Test Series (APT)

Built to eliminate 1/3rd negative marking losses and 50–50 option traps through structured simulation and NCERT-backed keys.

  • 50 High-Yield Tests: Subject Sectionals, Current Affairs, CSAT Paper II & Full-Length Simulators
  • 1/3rd Penalty & Trap Analytics: Identify whether marks are lost to over-attempting or conceptual gaps
  • Option-by-Option NCERT Keys: Detailed distractor analysis and elimination logic for every question
  • Custom PDF-to-Mock Generator: Convert your revision notes or current affairs PDFs into practice tests
Complete 50-Test Package
₹1,493₹1,799• Valid till Prelims 2027
Explore APT Test SeriesTry Free Mock
1-on-1 Personal MentorshipCapped at 10 Seats

1-on-1 UPSC Mentorship with Avinash Sir

Weekly 1-on-1 strategy reviews, daily study accountability, and personalized MCQ attempt audits with an experienced UPSC mentor.

  • Weekly 1-on-1 Sessions: Direct mentorship with Avinash Sir (Former Plutus IAS Mentor, UPSC & UPPCS Mains Written)
  • APT 50-Test Series Included: Full Prelims GS1 & CSAT test series bundled at no additional cost
  • Mock Attempt & Elimination Audit: Question-by-question review to calibrate your risk and attempt accuracy
  • Prelims & Integrated Tracks: Available as dedicated Prelims mentorship or end-to-end Prelims + Mains guidance
Prelims & Integrated Tracks
17% OFF• Includes APT 50-Test Series
Explore 1-on-1 MentorshipCompare Tracks
Previous QuestionWhich one of the following territories was not affected by the Revolt of 1857?
Next QuestionConsider the following statements: 1. There are 25 High Courts in India. 2. Punjab, Haryana and the Union Territory of Chandigarh have a common High Court. 3. The National Capital Territory of Delhi has a High Court of its own. Which of the statements given above is/are correct?