Acme Ai
A
अ
GS Paper IUPSC Prelims 1996
Health & Medicine
Question No. 270Interactive Test Mode
00:00
+2-0.66

Q270. When a mirror is rotated by an angle θ, the reflected ray will rotate by:

When a mirror is rotated by an angle θ, the reflected ray will rotate by:

Official UPSC Question Diagram / Map
UPSC Prelims 1996 Science and Technology (Health & Medicine) Question 270 Diagram
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 1996 • Science and Technology

Correct Answer: Option (D) — 2θ

Concept & Option Breakdown

Standard Reference Verified

According to the laws of reflection, if the incident ray direction is kept fixed and the plane mirror is rotated by an angle θ, the normal rotates by θ, increasing the angle of incidence by θ and the angle of reflection by θ. Consequently, the reflected ray rotates by 2θ.

Elimination Heuristic & Exam Approach

Standard optical theorem: Rotating a plane mirror by θ deflects the reflected beam by 2θ.

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 1996 (Q270)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (D) — 2θ

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 • Q254Health & Medicine

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

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

Frequently Asked Questions — UPSC Prelims 1996 Q270

What is the official answer for UPSC Prelims 1996 GS Paper I Question 270 (Science and Technology)?

The official UPSC answer key for this 1996 Science and Technology (Health & Medicine) question is Option (D): "2θ". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 1996 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?

Standard optical theorem: Rotating a plane mirror by θ deflects the reflected beam by 2θ.

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 QuestionWho among the following suggested the winding up of the Indian National Congress after India attained independence?
Next QuestionHis principal forte was social and religious reform. He relied upon legislation to do away with social ills and work unceasingly for the eradication of child marriage and the purdah system. To encourage consideration of social problems on a national scale, he inaugurated the Indian National Social Conference, which for many years met for its annual session alongside the Indian National Congress. The reference in this passage is to: