Acme Ai
A
अ
GS Paper IUPSC Prelims 1999
Health & Medicine
Question No. 269Interactive Test Mode
00:00
+2-0.66

Q269. Consider the following statements: 1. If a person looks at a coin which is in a bucket of water, the coin will appear to be closer than it really is. 2. If a person under water looks at a coin above the water surface, the coin will appear to be at a higher level than it really is. Which of the above statements is/are correct?

Consider the following statements:

  1. If a person looks at a coin which is in a bucket of water, the coin will appear to be closer than it really is.
  2. If a person under water looks at a coin above the water surface, the coin will appear to be at a higher level than it really is.

Which of the above statements is/are correct?

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 1999 • Science and Technology

Correct Answer: Option (A) — 1 and 2

Concept & Option Breakdown

Standard Reference Verified

Statement 1 is correct: When viewing an object in water from air (rarer medium looking into denser medium), rays bend away from the normal upon exiting water, making the apparent depth shallower than real depth (apparent depth = real depth / n). Statement 2 is correct: When viewing an object in air from underwater (denser medium looking into rarer medium), rays bend towards the normal upon entering water, making the object appear higher/further away (apparent height = real height × n).

Elimination Heuristic & Exam Approach

From rarer to denser medium, objects look closer (apparent depth < real depth); from denser to rarer medium, objects look farther (apparent height > real height).

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 1999 (Q269)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (A) — 1 and 2

Related & Repeated Prelims PYQs (5)

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

View Cluster in 3D Graph
2013 • Q11581% Match

Consider the following statements: 1. Size of the sun at dusk 2. Colour of the sun at dawn 3. Moon being visible at dawn 4. Twinkle of stars in the sky 5. Poles

Science and Technology • Biotechnology & GeneticsSolve
2001 • Q26281% Match

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): A

Science and Technology • Health & MedicineSolve
1996 • Q29681% Match

Consider the following statements: A person in a spaceship located half way between the earth and the sun will notice that the: (1) The sky is jet black. (2) st

Science and Technology • Space & ISROSolve
2013 • Q19180% Match

Rainbow is produced when sunlight falls on drops of rain. Which of the following physical phenomena are responsible for this? 1. Dispersion 2. Refraction 3. Int

Science and Technology • Health & MedicineSolve
2007 • Q25480% Match

Consider the following statements: 1. If magenta and yellow coloured circles intersect, the intersected area will have red colour. 2. If cyan and magenta colour

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
2009 • Q252Health & Medicine

Which one of the following types of waves are used in a night vision apparatus?

Science and TechnologyPractice
2008 • Q253Health & Medicine

Assertion (A): Radio waves bend in a magnetic field. Reason (R): Radio waves are electromagnetic in nature.

Science and TechnologyPractice
2008 • Q256Health & Medicine

Assertion (A): A jet aircraft moving at Mach Number equal to 1 travels faster at an altitude of 15 km than while moving at Mach Number equal to 1 near

Science and TechnologyPractice
2007 • Q255Health & Medicine

Consider the following statements : 1. A flute of smaller length produces waves of lower frequency. 2. Sound travels in rocks in the form of longitudi

Science and TechnologyPractice
2007 • Q256Health & Medicine

Assertion (A): A jet aircraft moving at Mach Number equal to 1 travels faster at an altitude of 15 km than while moving at Mach Number equal to 1 near

Science and TechnologyPractice
2006 • Q257Health & Medicine

In which one among the following is the speed of sound maximum?

Science and TechnologyPractice
2003 • Q258Health & Medicine

Diffusion of light in the atmosphere takes place due to:

Science and TechnologyPractice
2003 • Q259Health & Medicine

Which one of the following statements is not correct?

Science and TechnologyPractice

Frequently Asked Questions — UPSC Prelims 1999 Q269

What is the official answer for UPSC Prelims 1999 GS Paper I Question 269 (Science and Technology)?

The official UPSC answer key for this 1999 Science and Technology (Health & Medicine) question is Option (A): "1 and 2". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 1999 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?

From rarer to denser medium, objects look closer (apparent depth < real depth); from denser to rarer medium, objects look farther (apparent height > real height).

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 QuestionMatch List I (Quantity) with List II (Units) and select the correct answer using the codes given below the lists: | List-I | List-II | | :--- | :--- | | A. High speed | 1. Mach | | B. Wavelength | 2. Angstrom | | C. Pressure | 3. Pascal | | D. Energy | 4. Joule |
Next QuestionIn the new Panchayati Raj Bill enacted in 1993, there are several fresh provisions deviating from the past. Which one of the following is not one such provision?