Class 6 Science · Chapter 7
Short answer:
Chapter 7 "Temperature and its Measurement" me hum seekhte hain ki touch sense se temperature ka sirf rough andaza milta hai, exact value nahi — isliye thermometer ka use karte hain. Clinical thermometer (35°C–42°C range, kink ke saath) body temperature ke liye aur laboratory thermometer (−10°C se 110°C range) general experiments ke liye use hota hai. Temperature ki unit degree Celsius (°C) hai.
Chapter 7 "Temperature and its Measurement" NCERT Class 6 Science Curiosity book ka ek foundational chapter hai jo hume sikhata hai ki "garam" aur "thanda" ka feeling sirf ek rough andaza hota hai — accurate measurement ke liye humein scientific instrument yani thermometer ki zaroorat padti hai. Yeh chapter roz-marra ki life se juda hai: jab bhi bukhar aata hai, ghar me clinical thermometer nikala jaata hai — aur is chapter me hum samajhte hain ki woh kaise kaam karta hai.
Is chapter me hum touch sense ki limitations, thermometer ke different types (clinical aur laboratory), unka structure, sahi use karne ka tareeka, aur temperature measure karte waqt li jaane wali precautions padhte hain. Jaise Chapter 1 poore Class 6 Science Curiosity book ki neev banata hai scientific thinking ke liye, waise hi yeh chapter measurement skills ki practical neev banata hai jo aage Chapter 5 "Measurement of Length and Motion" aur Chapter 6 "Materials Around Us" jaise topics me bhi kaam aata hai.
Chapter 7 Summary — 5 Minute Revision
NCERT Class 6 Science Curiosity chapter 7 "Temperature and its Measurement" ke solutions me humne dekha ki temperature ko sahi tarike se measure karna kyun zaroori hai — kyunki humari body ka touch sense sirf ek rough, relative feeling deta hai, exact numerical reading nahi. Isi problem ko solve karne ke liye thermometer jaisa scientific instrument banaya gaya, jiske do main types NCERT syllabus me cover hote hain: clinical thermometer (35°C–42°C, human body ke liye, kink ke saath) aur laboratory thermometer (−10°C se 110°C, general experiments ke liye, bina kink ke).
Hamne yeh bhi dekha ki thermometer use karte waqt kaunsi precautions leni chahiye — jhatakna, eye-level se reading lena, cleaning karna — aur temperature ke increase/decrease se related simple numerical questions kaise solve karte hain (Final − Initial formula). Yeh chapter students ko sirf ek fact nahi sikhata, balki ek measurement mindset deta hai jo Chapter 5 "Measurement of Length and Motion" aur poore Class 6 Science Curiosity syllabus me kaam aata hai.
In-Text Questions — Solutions
Hum kisi cheez ko sirf haath se chhoo kar uska exact temperature kyun nahi bata sakte?
Haath sirf yeh mehsoos kara sakta hai ki koi cheez garam hai ya thandi — yeh sense relative hota hai, exact numerical value nahi de sakta. Iske alawa agar haath pehle kisi bahut thandi ya bahut garam cheez ko chhoo chuka ho, to next object ka temperature galat mehsoos ho sakta hai. Isi wajah se accurate aur reliable measurement ke liye thermometer jaisa instrument use kiya jaata hai jo ek fixed scale par reading deta hai.
Clinical thermometer me 'kink' (constriction) kyun banayi jaati hai?
Kink ek narrow moad hoti hai jo bulb ke thoda upar tube me hoti hai. Jab thermometer body se nikala jaata hai, to mercury/liquid apni jagah pe atak jaata hai kyunki wapas neeche jaane ke liye usse kink ke through squeeze hona padta hai jo mushkil hota hai. Isse doctor ko reading padhne ke liye kaafi time milta hai, bina temperature ke turant girne ki chinta kiye.
Laboratory thermometer ko clinical thermometer ki jagah body temperature naapne ke liye kyun use nahi karte?
Laboratory thermometer ka scale bahut wide (−10°C se 110°C) hota hai, jabki body temperature ek bahut chhoti range (35°C–42°C) me hi rehta hai. Itne wide scale par chhote-chhote temperature ke antar sahi se nahi dikh paate, isliye precise body temperature reading ke liye specially-designed clinical thermometer hi use hota hai.
Exercise Questions — Solutions (Q1–Q6)
1. Chhote temperature ke antar ko batane ke liye kaunsa instrument zyada sahi hai — clinical thermometer ya laboratory thermometer? Reason bhi do.
Answer: Iska jawab depend karta hai kis range me temperature measure karna hai.
Clinical thermometer sirf 35°C se 42°C ke narrow range me kaam karta hai — yeh sirf human body temperature ke liye design hua hai, isliye is range me chhote-chhote antar bahut accurately dikha sakta hai.
Laboratory thermometer −10°C se 110°C tak ke wide range ko cover karta hai, isliye general purpose experiments ke liye use hota hai lekin body-temperature jaise fine antar ke liye utna precise nahi hota.
Isliye: agar sawaal body temperature ka hai to clinical thermometer sahi hai; agar general science experiment (jaise paani garam karna) ka hai to laboratory thermometer sahi hai.
2. Ek beaker me paani ka temperature subah 9 baje 20°C tha aur dopahar 1 baje 32°C ho gaya. Temperature me kitna increase hua? Working dikhao.
Given: Initial temperature = 20°C, Final temperature = 32°C
Increase in temperature = Final temperature − Initial temperature
Increase in temperature = 32°C − 20°C = 12°C
Answer: Paani ke temperature me 12°C ka increase hua.
3. Sahi ya galat batao: Hum apne haath se chhoo kar exact temperature bata sakte hain. Reason do.
Answer: Galat.
Haath (touch sense) sirf yeh bata sakta hai ki koi cheez garam hai ya thandi — yani ek rough (moti) comparison de sakta hai. Lekin yeh exact numerical value nahi bata sakta.
Iske alawa, agar ek haath pehle se thandi cheez pe tha aur doosra garam cheez pe, to same paani do alag temperature jaisa mehsoos ho sakta hai — is wajah se touch sense unreliable hai. Isliye accurate aur consistent measurement ke liye thermometer jaise instrument ki zaroorat hoti hai.
4. Clinical thermometer ko use karne se pehle aur baad me kya-kya precautions leni chahiye? Kam se kam 4 likho.
Answer:
- Use karne se pehle thermometer ko jhatak kar (jerk karke) mercury/liquid level ko lowest mark (35°C ke neeche) tak le jao.
- Thermometer ke bulb ko jeebh ke neeche (ya bagal me) sahi tarike se rakho, taaki accurate reading mile.
- Kam se kam 1 minute tak thermometer ko usi position me rehne do taaki liquid apne final level tak pahunch jaye.
- Reading lete waqt thermometer ko eye-level par rakh kar dekho, side se nahi.
- Use ke baad thermometer ko clean karo (antiseptic solution se) taaki germs na failein.
- Thermometer ko gira mat do — glass thermometer bahut fragile hota hai aur toot sakta hai.
5. Ek laboratory thermometer ki reading 55°C hai. Isko Fahrenheit jaanne ki zaroorat nahi hai (Class 6 me nahi padhaya jata), lekin batao ki yeh temperature paani ko ubaalne (100°C) se kitna kam hai?
Given: Current temperature = 55°C, Boiling point of water = 100°C
Difference = 100°C − 55°C = 45°C
Answer: Yeh temperature paani ke boiling point se 45°C kam hai.
6. Kyun humein clinical aur laboratory thermometer alag-alag design kiye jaate hain — same thermometer dono kaam ke liye kyun nahi use kar sakte?
Answer: Dono thermometers ka purpose aur range alag hota hai.
Clinical thermometer sirf human body temperature (35°C–42°C) measure karne ke liye banaya jaata hai — is narrow range me yeh bahut precise hota hai aur isme ek 'kink' (constriction) hoti hai jo reading ko tab tak hold karti hai jab tak use jhataka na jaaye, taaki doctor aaram se reading padh sake.
Laboratory thermometer general experiments ke liye hota hai jaha temperature bahut zyada ya bahut kam ho sakta hai (−10°C se 110°C), aur isme koi kink nahi hoti kyunki continuous temperature change record karna hota hai.
Agar hum laboratory thermometer se body temperature naapein, to precise reading nahi milegi kyunki uska scale bahut wide hai. Isliye alag-alag design zaroori hai.
Important Equations — Ek Nazar Me
| Concept | Formula / Rule |
|---|---|
| Temperature change | Change in temperature = Final temperature − Initial temperature |
| Clinical thermometer range | 35°C to 42°C (human body temperature range) |
| Normal human body temperature | ≈ 37°C |
| Laboratory thermometer range | −10°C to 110°C (general experiments) |
| Unit of temperature (used in this chapter) | Degree Celsius (°C) |
↔ Table ko side me swipe karein
Common Mistakes — Yahan Marks Kat te Hain
- Clinical thermometer aur laboratory thermometer ke range (35°C–42°C vs −10°C se 110°C) ko confuse kar dena — exam me galat range likhna common mistake hai.
- Yeh sochna ki haath se chhoo kar bhi exact temperature (numerical value) bataya ja sakta hai, jabki yeh sirf ek rough comparison deta hai.
- Clinical thermometer ki 'kink' ka function bhool jaana ya ise galat explain karna — students isse 'bulb' samajh lete hain jabki yeh ek narrow constriction hai jo reading ko hold karti hai.
- Thermometer use karne se pehle usse jhataka (jerk) na karna ya reading lete waqt eye-level check na karna — yeh practical/activity-based questions me marks katne ka common reason hai.
- Temperature ki unit likhte waqt 'degree' ya '°C' symbol likhna bhool jaana, ya use Celsius ki jagah kisi aur unit se confuse kar dena.
- Increase/decrease ka calculation karte waqt initial aur final temperature ko ulta rakh dena, jisse negative ya galat answer aa jaata hai — hamesha 'Final − Initial' formula yaad rakho.
Board-Style Important Questions
- Clinical thermometer aur laboratory thermometer me antar batao. (Reasoning-based, exam me frequently poocha jaata hai)
- Hum sirf touch sense se temperature ka exact andaza kyun nahi laga sakte? Explain karo.
- Ek numerical question jisme initial aur final temperature diya ho aur temperature ka increase/decrease calculate karna ho.
- Clinical thermometer use karne se pehle aur baad me li jaane wali precautions list karo.
- Thermometer ki kink (constriction) ka kya function hai? Diagram ke saath explain karo.
- Daily life me temperature measurement ki zaroorat kahan-kahan padti hai? Do examples do.
Aksar Poochhe Jaane Wale Sawaal
Class 6 Science Curiosity chapter 7 'Temperature and its Measurement' me kya-kya topics cover hote hain?
Is chapter me hot aur cold ka concept, touch se temperature judge karne ki limitations, thermometer ki zaroorat, clinical thermometer aur laboratory thermometer ke structure/use, temperature measure karne ka sahi tareeka, aur Celsius scale ka basic parichay cover hota hai.
Clinical thermometer aur laboratory thermometer me kya farak hai?
Clinical thermometer 35°C se 42°C ke narrow range me kaam karta hai aur sirf human body temperature naapne ke liye banaya gaya hai — isme kink (constriction) hoti hai jo reading ko fix rakhti hai. Laboratory thermometer −10°C se 110°C tak wide range cover karta hai aur general science experiments (jaise paani ka temperature naapna) ke liye use hota hai, isme kink nahi hoti.
Temperature ki SI unit kya hai jo NCERT Class 6 me padhaya jaata hai?
NCERT Class 6 Curiosity textbook me temperature ko Celsius scale (°C) me measure karna sikhaya jaata hai, jo everyday life aur laboratory dono me sabse common unit hai.
Kya sirf haath se touch karke exact temperature bata sakte hain?
Nahi. Haath se sirf yeh andaza laga sakte hain ki koi cheez relatively garam hai ya thandi — yeh ek rough comparison hai, exact numerical value nahi. Iske alawa yeh sense pehle se touch ki gayi cheez ke temperature se bhi affect ho sakta hai, isliye accurate measurement ke liye thermometer zaroori hai.
Class 6 Science Curiosity book purane NCERT syllabus se kaise different hai?
Naya 'Curiosity' textbook (2026-27 rationalised syllabus) activity-based aur inquiry-driven approach follow karta hai, jisme diagrams, hands-on activities aur real-life examples zyada hain compared to purani NCERT Science book. Chapter structure bhi thoda reorganize hua hai — jaise Temperature ka chapter ab standalone topic ke roop me measurement ki activity ke saath present hota hai.
Is chapter ke exam-important questions kaunse hain?
Sabse zyada asked questions typically inn par based hote hain: clinical vs laboratory thermometer ka difference, thermometer use karne ke precautions, temperature ke measurement ka sahi tareeka, aur touch sense ki limitations wale reasoning-based questions. Numerical questions jisme initial aur final temperature diya ho aur difference nikalna ho, bhi common hain.
Class 6 Science — Saare Chapters
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