Acme Ai
A
अ
GS Paper IUPSC Prelims 1999
Health & Medicine
Question No. 334Interactive Test Mode
00:00
+2-0.66

Q334. Assertion (A): To dilute sulphuric acid, acid is added to water and not water to acid. Reason (R): Specific heat of water is quite large.

Assertion (A): To dilute sulphuric acid, acid is added to water and not water to acid. Reason (R): Specific heat of water is quite large.

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) — Both A And R are true and R is the correct explanation of A

Concept & Option Breakdown

Standard Reference Verified

Assertion (A) is true: Dilution of concentrated sulphuric acid is strongly exothermic. Adding water to concentrated acid can boil the localized water instantly and cause dangerous splattering of acid. Hence, acid is added slowly to a larger volume of water. Reason (R) is true: Water has a remarkably high specific heat capacity (4.184 J/g°C), which allows it to absorb and dissipate the heat released during dissolution without a sudden, localized temperature spike. Reason (R) correctly explains Assertion (A).

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 (Q334)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (A) — Both A And R are true and R is the correct explanation of A

Related & Repeated Prelims PYQs (25)

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

View Cluster in 3D Graph
2002 • Q32784% Match

Assertion(A): Synthetic detergents can lather well in hard water. Reason (R): Synthetic detergents form soluble calcium and magnesium salts with hard water.

Science and Technology • Health & MedicineSolve
1998 • Q35784% Match

Assertion (A): Formic acid is a stronger acid than acetic acid. Reason (R): Formic acid is an organic acid. (a) Both A and R are true and R is the correct expla

Science and Technology • Health & MedicineSolve
1998 • Q28083% Match

Assertion (A): The temperature of a metal wire rises when an electric current is passed through it. Reason (R): Collision of metal atoms with each other release

Science and Technology • Health & MedicineSolve
2000 • Q30783% Match

Assertion (A): Large cold storage plants use ammonia as refrigerant while domestic refrigerators use chlorofluoro- carbons. Reason (R): Ammonia can be liquefied

Science and Technology • Health & MedicineSolve
2002 • Q22483% Match

Assertion (A): With the increase of temperature, the viscosity of glycerine increases. Reason (R): Rise of temperature increases kinetic energy of molecules. Co

Science and Technology • Health & MedicineSolve
1998 • Q34083% Match

Assertion (A): Sodium metal is stored under kerosene. Reason (R): Metallic sodium melts when exposed to air. (a) Both A and R are true and R is the correct expl

Science and Technology • Health & MedicineSolve
2001 • Q24683% Match

Assertion (A): A piece of copper and a piece of glass are heated to the same temperature. When touched, thereafter, the copper piece appears hotter than the gla

Science and Technology • Health & MedicineSolve
2003 • Q32583% Match

Assertion (A): Coal-based thermal power stations contribute to acid-rain. Reason (R): Oxides of carbon are emitted when coal burns.

Science and Technology • Health & MedicineSolve
2003 • Q32482% Match

Given below: Assertion (A): In the periodic table of chemical elements, electron affinity is always found to increase from top to bottom in a group Reason (R):

Science and Technology • Health & MedicineSolve
2003 • Q38682% Match

Assertion (A): Unsaturated fats are more reactive compared with the saturated fats. Reason (R): Unsaturated fats have only single bonds in their structure.

Science and Technology • Health & MedicineSolve
2002 • Q22582% Match

Assertion (A): An iron ball floats on mercury but gets immersed in water. Reason (R): The specific gravity of iron is more than that of mercury. Codes:

Science and Technology • Health & MedicineSolve
2006 • Q38481% Match

Assertion (A): Cellulose is used in making shatter-proof glass. Reason (R): Polysaccharides are not soluble in water. Codes:

Science and Technology • Health & MedicineSolve
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
2001 • Q25381% Match

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

Science and Technology • Health & MedicineSolve
2008 • Q25381% Match

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

Science and Technology • Health & MedicineSolve
2001 • Q24781% Match

Assertion (A): The boiling point of water decreases as the altitude increases. Reason (R): The atmospheric pressure increases with altitude. Codes: (a) Both A a

Science and Technology • Health & MedicineSolve
2008 • Q41781% Match

Assertion (A): In human body, liver has important role in fat digestion. Reason (R): Liver produces two important fat-digesting enzymes.

Science and Technology • Health & MedicineSolve
1999 • Q3281% Match

Assertion (A): Dolly was the first cloned mammal. Reason (R): Dolly was produced by in vitro fertilization.

Science and Technology • Biotechnology & GeneticsSolve
2007 • Q25681% Match

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 the sea l

Science and Technology • Health & MedicineSolve
2008 • Q25681% Match

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 the sea l

Science and Technology • Health & MedicineSolve
1998 • Q35580% Match

Assertion (A): Phenyl is used as a household germicide. Reason (R): Phenyl is phenol derivative and phenol is an effective germicide. (a) Both A and R are true

Science and Technology • Health & MedicineSolve
2005 • Q43980% Match

Assertion (A): All the proteins in our food are digested in small intestine only. Reason (R): The protein-digesting enzyme from pancreas are released into small

Science and Technology • Health & MedicineSolve
2005 • Q44080% Match

Assertion (A): Amoeba reproduces by fission. Reason (R): All unicellular organisms reproduce by asexual methods.

Science and Technology • Health & MedicineSolve
2005 • Q35080% Match

Assertion (A): The main constituent of the liquefied petroleum gas is methane. Reason (R): Methane can be used directly for burning in homes and factories where

Science and Technology • Health & MedicineSolve
2003 • Q5380% Match

Assertion (A) : The amount of moisture in the atmosphere is related to latitude. Reason (R) : The capacity to hold moisture in the form of water vapour is relat

Geography • Climatology & AtmosphereSolve

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
2004 • Q321Health & Medicine

Consider the following statements: 1. Baking soda is used in fire extinguishers. 2. Quick lime is used in the manufacture of glass. 3. Gypsum is used

Science and TechnologyPractice
2004 • Q322Health & Medicine

Salts of which of the following elements provide colours to fireworks?

Science and TechnologyPractice
2003 • Q323Health & Medicine

Which one of the following statements is NOT correct?

Science and TechnologyPractice
2002 • Q326Health & Medicine

Match List-I (Oxidation number) with List II (The element) and select the correct answer using the codes given below the lists: | List-I (Oxidation n

Science and TechnologyPractice
2001 • Q328Health & Medicine

An aqueous solution of copper sulphate is acidic in nature because the salt undergoes:

Science and TechnologyPractice
2001 • Q329Health & Medicine

Consider the following statements with reference to the periodic table of chemical elements: 1. Ionisation potential gradually decreases along a perio

Science and TechnologyPractice
2000 • Q330Health & Medicine

Match List-I with List-II and select the correct answer using the codes given below the lists: | List-I | List-II | | :--- | :--- | | A. German silve

Science and TechnologyPractice
2000 • Q331Health & Medicine

Which one of the following materials is very hard and very ductile?

Science and TechnologyPractice

Frequently Asked Questions — UPSC Prelims 1999 Q334

What is the official answer for UPSC Prelims 1999 GS Paper I Question 334 (Science and Technology)?

The official UPSC answer key for this 1999 Science and Technology (Health & Medicine) question is Option (A): "Both A And R are true and R is the correct explanation of A". 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?

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.

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 pairs of states and tribes is not correctly matched ?
Next QuestionMatch List-I (Naturally occurring substances) with List-II (Elements) and select the correct answer using the codes given the lists: | List-I | List-II | | :--- | :--- | | A. Diamond | 1. Calcium | | B. Marble | 2. Silicon | | C. Sand | 3. Aluminium | | D. Ruby | 4. Carbon | Codes: