Class 6 Science Chapter 5 NCERT Solutions Hinglish mein: Measurement of Length and Motion

Curiosity (Reprint 2026-27) ke Chapter 5, Measurement of Length and Motion, ki Activities 5.1 se 5.7, text ke beech ke sawaalon, saare 13 “Let us enhance our learning” sawaalon aur Learning further ke kaamon ke jawab. Page numbers book se match karte hain. Naapne waali activities mein sample readings hain; tumhari readings alag hongi. Short notes: Chapter 5 notes.

Deepa ki nayi uniform (page 79)

Kya tape aur rod geometry box ki scale jaise hain? Haan. Teeno length naapte hain aur standard units, centimetre aur millimetre, mein nishaan bane hote hain. Dhaatu ki rod scale jaisi sakht hai par lambi (aksar 1 m), jabki darzi ka tape flexible hai, isliye wo sharir ke chaaron taraf mud sakta hai.

Mummy ke char angula ka kya matlab tha? Saath rakhi chaar ungliyon ki chaudaai. Angula yaani ungli ki chaudaai, length ki ek purani Bharatiya unit, isliye uniform ko lagbhag chaar ungli chaudaai lamba karna tha (kisi bade ke haath se lagbhag 7 cm).

Baalisht se naapna (pages 80–81)

Paanch doston ko ek hi table ke liye alag number mile (Table 5.1), kyunki unki baalisht alag-alag size ki hai. Chhoti baalisht table par zyada baar aati hai. Isliye baalisht bharose ki unit nahi hai: humein aisi unit chahiye jo sabke liye ek jaisi ho.

Standard units (pages 82–83)

Kya do shehron ke beech railway line ki lambaai ya panne ki motaai ke liye metre use karna aasaan hoga? Nahi. Railway line hazaaron metre lambi hai, isliye kilometre aasaan hai; panna millimetre ke bhi chhote hisse jitna mota hai, isliye uske liye metre se kahin behtar millimetre hai.

Length sahi tareeke se naapna (pages 84–86)

Kya metre scale se bhi nateeje alag aayenge? Agar sab scale sahi tarah use karein to nateeje ek jaise ya bahut thode alag aayenge: table ke saath-saath, usse chhoota hua, zero se shuru, aur aankh reading ke theek upar.

Aankh ki sahi position B hai, pencil ke sire ke theek upar. Tooti scale ho to kisi poore mark se shuru karo: 10.4 cm − 1.0 cm = 9.4 cm.

Kuch length naapne waale device flexible cheezon se kyun bane hote hain? Taaki wo ped ke tane, kisi ki chhaati ya kamar, ya botal ke tale jaisi ghumaavdaar aur gol satahon ke chaaron taraf mud sakein, jo sakht scale nahi kar sakti.

Activity 5.1: Let us measure (page 86)

Metre scale se sample readings:

Cheez	Cheez ki length
Kanghi	12.5 cm
Pen	14.2 cm
Pencil	17.6 cm
Rubber	4.0 cm

Doston ki readings thodi alag ho sakti hain. Sambhav kaaran: scale theek cheez ke saath nahi rakhi, cheez theek zero se shuru nahi hui, aankh mark ke theek upar nahi thi, ya sira do millimetre marks ke beech aaya aur alag tarah padha gaya.

Ghumaavdaar line naapna (page 87)

Anish ke parivaar ne string lights kaise naapi hongi? Mehraabon ke saath flexible measuring tape chalaakar, ya mehraabon ke saath dhaaga rakhkar, uske sire mark karke, use seedha karke aur metre scale par naapkar.

Position batana (pages 87–89)

Garden aur school ke baare mein kaun sahi hai? Sab. Har dost apne ghar se naap raha hai: Deepa aur Anish ke ghar se school paas hai, Tasneem aur Padma ke ghar se garden paas hai, aur Hardeep ka ghar lagbhag beech mein hai. Agar sab ek hi reference point, jaise bus stand, se naapte, to sab sahmat hote.

Kilometre stones kya batate hain? Us jagah ki Delhi se doori, jahan Delhi reference point hai. Padma ko pata chala ki wo paas aa rahi hai kyunki dikhaayi gayi doori ghat rahi thi: 70 km, phir 60 km.

Kya Padma ki position samay ke saath badal rahi hai? Haan. Delhi ke hisaab se uski position samay ke saath 70 km se 60 km ho jaati hai. Kisi cheez ki position reference point ke hisaab se tab badalti hai jab wo cheez chalti hai; agar wo na chale, to position wahi rehti hai.

Activity 5.2: chalti cheezein (page 90)

Zameen aur aas-paas ki imaaraton ko reference point maankar sample Table 5.3:

Cheez	Motion mein ya rest mein? Kyun?
Khet mein charti gaay	Motion mein: uski position badalti rehti hai
Sadak par car	Motion mein: sadak par uski position badalti hai
Udti chidiya	Motion mein: har pal position badalti hai
Chalte pankhe ke blades	Motion mein: ghoomte rehte hain
Ghadi ki suiyan	Motion mein: dheere-dheere ghoomti hain
Ped	Rest mein: usi jagah khada hai
Class ki table	Rest mein: position nahi badalti
Khadi cycle	Rest mein: jahan chhodi wahin hai
Bijli ka khamba	Rest mein: zameen mein gada hai
School ki building	Rest mein: hilti nahi

Kaise tay karein ki cheez motion mein hai ya rest mein? Dekho ki reference point ke hisaab se uski position samay ke saath badalti hai ya nahi: badalti hai to motion mein, nahi badalti to rest mein.

Think it over: bina khidki ka jahaaz (page 91)

Nahi. Agar jahaaz shaant samudra par ek jaisi raftaar se seedhi line mein chal raha hai, to andar ki har cheez, tum bhi, uske saath chal rahi hai, aur andar kuch bhi waisa hi bartaav karta hai jaisa ruke jahaaz mein. Bahar ki koi cheez reference point ke roop mein dikhe bina tum nahi bata sakte ki jahaaz chal raha hai. (Extra: scientist Galileo ne ye baat jahaaz ke udaharan se samjhaayi thi.)

Activities 5.3 se 5.6: motion ke types (pages 91–94)

• Activity 5.3: giraaya gaya rubber seedhi line mein girta hai, aur ped se girta santra bhi. March-past mein students seedhi lines mein chalte hain, aur dhakela gaya dabba bhi seedhi line mein: sab linear motion hain. Jhoola aur merry-go-round linear motion nahi hain.
• Activity 5.4: dhaage se ghumaaya rubber merry-go-round ki tarah gol raaste par chalta hai: circular motion.
• Activity 5.5: latka rubber, ek taraf karke chhodne par, jhoole ki tarah aage-peeche hota hai: oscillatory motion.
• Activity 5.6: dhaatu ki patti ka khula sira apni rukne ki jagah ke upar-neeche hota hai: oscillatory motion.

Activity 5.7: bachchon ke park mein motion (pages 94–95)

Cheez	Motion ka type aur kyun
Jhoola	Oscillatory: aage-peeche hota hai
Slide	Linear: bachcha seedhe raaste par fisalta hai
Merry-go-round	Circular: gol raaste par ghoomta hai
See-saw	Oscillatory: har sira beech ke point ke upar-neeche hota hai
Skipping rope	Circular: rassi gol-gol ghoomti hai

Let us enhance our learning (pages 97–99)

1. Lambaai ko unit se milaao

• Delhi aur Lucknow ke beech ki doori: kilometre
• Sikke ki motaai: millimetre
• Rubber ki lambaai: centimetre
• School ke maidaan ki lambaai: metre

2. Sahi ya galat

(i) Sahi: car seedhi line mein chalti hai. (ii) Sahi: motion ka yahi matlab hai. (iii) Galat: 1 km = 1000 m = 100,000 cm.

3. Jo standard unit nahi hai

(iv) Baalisht (handspan): ye insaan-insaan mein alag hoti hai.

4. Scales aur tapes ki sabse chhoti value

Sample table:

Scale ya tape	Sabse chhoti value jo naap sakte hain
15-cm scale	1 mm
Metre scale	1 mm (kuch par sirf cm)
Darzi ka tape	1 mm ya 0.5 cm, nishaanon ke hisaab se
Steel measuring tape	1 mm
Maidaan ka lamba tape	1 cm

5. 1.5 km metre mein

1.5 km = 1.5 × 1000 m = 1500 m.

6. Gilaas ya botal ka ghumaavdaar tala

Tale ke chaaron taraf ek baar dhaaga lapeto, jahan wo milta hai wahan mark karo, dhaage ko seedha karke scale par naapo. Sample: steel ke gilaas ka tala chaaron taraf 22 cm naapa gaya.

7. Dost ki lambaai

Sample: 1.42 m = 142 cm = 1420 mm. (m × 100 = cm; cm × 10 = mm.)

8. Notebook par sikke

Sample: lambi side par 12 sikkon ka andaaza. Naapo: side 24 cm hai aur sikka 2 cm chauda, to 24 cm ÷ 2 cm = 12 sikke. Sikkon ko bina gap ke kinaare se kinaara milaakar rakhkar jaancho; thoda farq aana aam baat hai.

9. Har type ki motion ke do udaharan

• Linear: seedhi sadak par car; oonchaai se giraaya patthar.
• Circular: ceiling fan ke blade ki nok; giant wheel.
• Oscillatory: deewar ghadi ka pendulum; jhoola.

10. Aas-paas ki cheezon ke size

Size	Cheezein
mm	sikke ki motaai, pencil ka lead, chaawal ka daana
cm	rubber, pencil, notebook
m	classroom, darwaaze ki oonchaai, saari

11. Rollercoaster track

• A se B: seedhi dhalaan: linear motion.
• B se C, D aur E: gend loop mein ghoomti hai: circular motion.
• Loop ke baad F tak: seedha track: phir se linear motion.

12. Tasneem ki metre scale

Use khinchne waala rubber aur kapda use nahi karna chahiye: ye khinchte aur dheele padte hain, isliye ek hi scale alag samay par alag lambaai degi. Plywood aur steel apni lambaai banaaye rakhte hain, isliye achhi scale bante hain. Kaagaz apni lambaai to rakhta hai par aasaani se phatta, mudta aur ghis jaata hai, isliye usse sirf kaam chalaau scale banegi jo zyada din nahi chalegi.

13. Length ki units par card game

Sample game, “Length Pairs”: barabar lambaai ke jodon mein 20 cards banao, jaise 1 m aur 100 cm, 1 km aur 1000 m, 5 cm aur 50 mm, 2.5 m aur 250 cm, 1.5 km aur 1500 m. Cards mila kar ulte rakh do. Khiladi baari-baari do cards palatte hain; agar lambaai barabar ho to wo joda rakh lete hain. Sabse zyada jode waala jeetta hai.

Learning further (pages 99–100)

• Ek panne ki motaai: kitaab ki 100 sheets dabaakar naapo, maan lo 10 mm, aur bhaag do: 10 mm ÷ 100 = 0.1 mm har sheet.
• Ek hi ped ki pattiyan: aam ke ped ka sample: pattiyon ki lambaai 15.2 cm se 21.0 cm aur chaudaai 4.1 cm se 5.6 cm. Ek hi ped ki pattiyan unki umar, ped par unki jagah, aur har patti ko mili roshni, paani aur khaane ki wajah se alag hoti hain.
• Purani units: bade log baalisht, haath (lagbhag aadha metre), gaj (lagbhag 0.9 m) aur kos (kuch kilometre) bata sakte hain; inki value jagah-jagah alag hoti thi. (Extra: Gujarat ki Harappa kaal ki jagah Lothal se baareek nishaanon waali haathi-daant ki scale mili hai.)
• Bhool-bhulaiya (maze): 15-cm scale se squared kaagaz par theek 1 cm aur 2 cm ki lines banao, entry se exit tak ek raasta khula chhodo aur baaki sab band karo.
• Main kitna lamba hoon? Bina joote ke deewar se seedhe khade ho, kisi bade se sir ke upar scale samtal rakhkar mark lagwaao, farsh se naapo, aur har teen mahine dohraao.
• Cycle se doori: doori = pahiye ke baahari kinaare ki lambaai × chakkaron ki ginti; jaise 2 m × 500 chakkar = 1000 m = 1 km. Jones Counter cycle ke aage ke pahiye par lagne waala ek chhota ginti device hai; ye pahiye ke chakkar ginta hai, aur race karaane waale isse marathon jaisi sadak daudon ke raaste naapte hain.

Aur practice ke liye padho length ki standard units, length sahi kaise naapein aur motion ke types.