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CuriosityCh 5 Lambai aur Motion ki Measurement

Measurement of Length and Motion (Lambai aur Motion ki Measurement): Class 6 Science Chapter 5 Hinglish mein

Curiosity · Hinglish notes, simulations aur practice · Official NCERT chapter PDF ↗

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  • 88 min
  • 17 practice questions
  • 26 MCQs

Is chapter mein aap kya seekhenge

  • Samjhao ki handspan ya footsteps se naapne par alag-alag answers kyun aate hain, aur sabko ek hi standard unit ki zaroorat kyun hai
  • Length ki SI unit, metre, use karo aur kilometre, metre, centimetre aur millimetre ke beech convert karo
  • Length sahi tarah naapo: sahi tool chuno, scale ko object ke saath-saath rakho, mark ko seedha upar se dekho aur toote end ke saath bhi kaam chalao
  • Thread ya flexible tape se curved line naapo
  • Kisi reference point se uski distance batakar samjhao ki koi cheez kahan hai
  • Chune hue reference point ke hisaab se tay karo ki koi cheez move kar rahi hai ya ruki hai
  • Apne aas-paas linear, circular aur oscillatory motion pehchano, aur periodic motion ko pehchano

NCERT Science Class 6, Chapter 5, pp. 79–100 par based original companion text. Yeh NCERT se juda nahi hai aur NCERT ne ise endorse nahi kiya hai.

Naapna kyun?

Guwahati se tumhari cousin ka phone aata hai. “Tumhari nayi patang kitni badi hai?” woh poochti hai. Tum apni baahein failakar kehte ho, “Itni badi!” Lekin phone par woh tumhari baahein nahi dekh sakti. To tum use kaise bataoge? Tumhe patang ko kisi aisi cheez se compare karna hoga jise tum dono jaante ho.

Log din bhar cheezein naapte rehte hain. Darzi customer ki kamar ke chaaron taraf naram tape lapetta hai. Mistri lambe steel tape se deewar check karta hai. Carpenter darwaze ka frame fit karne ke liye wooden rule kholta hai. Tamil Nadu mein phool bechne wali chameli ki maala ko apne forearm se naapti hai. Yeh sab ek hi kaam kar rahe hain: ek length ko ek aisi length se compare karna jo unhe pehle se pata hai. Isi ko measurement (मापन) kehte hain. Inke kuch tools Fig. 5.1 mein dikhaye gaye hain.

Fig. 5.1Alag-alag tools, kaam ek: ek length ko jaani-pehchani length se compare karna.NCERT p. 79

Chaar measuring tools, har ek par label. Upar left mein darzi ka naram orange tape dheele gol lapet mein pada hai, uska marked end bahar khincha hua hai. Upar right mein steel tape ka peela blade gol kono wale case se bahar khincha hua hai. Neeche left mein wooden folding rule teen seedhe tukdon ke zigzag mein khula hai. Neeche right mein chhota neela 15-cm scale hai.

Is chapter mein tum lengths ko waise naapna seekhoge jaise scientists naapte hain. Phir hum chalne wali cheezon ki baat karenge. Hum kaise batate hain ki koi cheez kahan hai? Aur hum kaise jaante hain ki woh move kar rahi hai ya nahi?

5.1 Hum Kaise Naapte hain?

Rulers se bahut pehle log apne shareer se naapte the. Mistri deewar ko haath mein check karta tha, yaani kohni se beech wali ungli ke sire tak ki length. Gully-cricket ki pitch banate bachche apne kadam ginte hain. Kai bade-boodhe aaj bhi बालिश्त (balisht) se naapte hain. Yeh khule haath mein angoothe ke sire se chhoti ungli ke sire tak ka failaav hai. Hum ise handspan kehte hain.

Shareer ke naap hamesha tumhare saath hote hain, aur inka koi kharcha bhi nahi. To isme gadbad kya ho sakti hai? Fig. 5.2 dekho.

4/4Charpai nahi badli. Sirf handspan ka size badla, isliye numbers alag hain.

Fig. 5.2Ek hi charpai, do handspans, do alag answers.NCERT Fig. 5.1 · p. 80

Ek lambi charpai do pairon par khadi hai, aur dashed lines uske dono ends mark karti hain. Pehle step mein ek sawaal poochta hai ki woh kitni lambi hai. Doosre step mein baarah chhote neele arcs charpai ke upar uchhalte hue chalte hain, 1 se 12 tak numbered, label hai Riya: 12 chhote spans. Teesre step mein upar aath bade orange arcs judte hain, 1 se 8 tak numbered, label hai Dadaji: 8 bade spans. Aakhri step mein charpai ke neeche double-headed arrow kehta hai same length.

Riya ka answer hai “12 handspans” aur Dadaji ka “8 handspans”. Dono mein se koi galat nahi hai! Har answer ke do hisse hain: ek number (12 ya 8) aur ek unit (मात्रक), jo yahan handspan hai. Dikkat yeh hai ki Riya ki unit aur Dadaji ki unit ka size same nahi hai. Badi unit kam baar fit hoti hai, isliye woh chhota number deti hai.

Definition
Unit

Ek fixed maatra jisse hum naapte waqt cheezon ko compare karte hain. Measurement ko number aur uske baad uski unit ke roop mein likhte hain.

Example“5 metres kapda” mein 5 number hai aur metre unit hai.

Ab socho ki tum 20 handspans ribbon khareed rahe ho, pehle chhote haath wale dukaandaar se aur phir bade haath wale se. Same paison mein tumhe alag-alag ribbon milega! Imaandaari se khareedne-bechne ke liye, aur dhyaan se kaam karne ke liye, humein aisi unit chahiye jo har jagah sabke liye same ho.

Quick check
3 mein se 1
Tara ek chatai naapti hai aur use 10 handspans milte hain. Uske chacha usi chatai ko naapte hain aur unhe 7 milte hain. Sabse achha explanation kya hai?
Answer dekho

Answer (C) Chacha ka handspan Tara ke handspan se lamba hai

Badi unit kam baar fit hoti hai. Chacha ko kam spans lage, isliye unka handspan lamba hai. Kisi ne galti nahi ki: dono ne bas alag units use ki.

5.2 Standard Units

Socho Surat ka ek silk wala hai aur door Kolkata se ek khareedaar aaya hai. Bechne wale ka haath khareedaar ke haath se lamba ya chhota ho sakta hai. To asal mein “20 haath” silk kitna hua? Aise jhagde kabhi poori duniya mein hote the, kyunki har jagah ki apni units thi. Aaj lagbhag har desh units ka ek hi mana hua set use karta hai, International System of Units. Short mein hum inhe SI units kehte hain.

Standard unit (मानक मात्रक) ka matlab har desh mein sabke liye bilkul same maatra hai. Length ke liye SI unit metre hai, short mein m likhte hain. Ek metre lagbhag zameen se darwaze ke handle ki oonchai jitna hota hai.

Definition
Standard unit

Aisi unit jiska mana hua size har jagah sabke liye same hai. Length ki SI unit metre (m) hai.

ExampleMetre, centimetre, millimetre aur kilometre.

Koi eraser ko metres mein nahi naapta: number bahut chhota aur ajeeb aayega. Chhoti cheezon ke liye chhoti unit chahiye, aur 100 centimetres (cm) milkar ek metre banate hain. Tumhare geometry box ke scale par numbered marks 1 cm ki doori par hain. Ab Fig. 5.3 ke saath zoom in karo.

3/31 cm ke andar 10 chhote barabar gaps hain. Har ek 1 mm hai, sabse chhoti length jo tum is scale par padh sakte ho.

Fig. 5.3Zoom in: 1 cm mein 10 mm hote hain.NCERT Fig. 5.3 · p. 83

0 se 15 tak marked peela scale figure ke upar ke hisse mein hai. Pehle step mein words kehte hain ki yeh 15-cm scale hai aur bade numbers centimetres hain. Doosre step mein ek orange box 4 aur 5 ke beech ka gap chunta hai, aur dashed lines neeche ek bade kiye hue strip tak le jaati hain, jahan ek bracket 1 cm mark karta hai. Teesre step mein bade strip ke andar das chhote barabar gaps dikhte hain, unmein se ek shaded hai aur uska label 1 mm hai, aur bracket par likha hai 1 cm = 10 mm.

Numbers ke beech ki chhoti lines ka kya? Apne scale par koi bhi centimetre chuno aur uske andar ke chhote gaps gino. Tumhe das milenge, sab barabar. Har gap ek millimetre (mm) hai. To 10 mm se 1 cm banta hai, aur 1 mm=0.1 cm. Scale par in gaps se baareek kuch nahi hai, isliye 1 mm sabse chhoti length hai jo tum us par padh sakte ho.

Lambi distances ke liye metre bhi bahut chhota hai. Koi nahi kehta ki uske nana-nani ka gaon 12,000 metres door hai. Hum kehte hain ki woh 12 kilometres (km) door hai. Ek kilometre 1000 metres hota hai.

Length ki units
1 km=1000 m1 m=100 cm1 cm=10 mm
Fig. 5.4Chhoti unit par neeche utro: multiply karo. Badi unit par upar chadho: divide karo.

Chaar rangeen blocks left se right seedhi ki tarah neeche utarte hain: km ke saath example bus journey, m ke saath classroom, cm ke saath pencil aur mm ke saath cheenti. Har block se agle tak curved arrows neeche jaate hain, jin par times 1000, times 100 aur times 10 likha hai. Kone mein ek note kehta hai ki ek step neeche jaane ka matlab multiply aur ek step upar jaane ka matlab divide.

Fig. 5.4 ki seedhi convert karne mein madad karti hai. Jab tum chhoti unit par neeche utarte ho, to chhoti units zyada baar fit hoti hain, isliye number bada ho jaata hai: tum multiply karte ho. Jab tum badi unit par upar chadhte ho, to divide karte ho.

Example

Kilometres se metres

School cycle rally ka raasta 3.4 km lamba hai. Yeh kitne metres hua?

Pehle khud try karo. Phir solution ek-ek step karke kholo.

Example

Ek oonchai, teen units

Anu ki steel ki almari 1 m 85 cm oonchi hai. Uski oonchai centimetres, millimetres aur metres mein likho.

Pehle khud try karo. Phir solution ek-ek step karke kholo.

Quick check
4 mein se 1
Ek nature trail 2.5 km lambi hai. Yeh kitne metres hua?
m
Answer dekho

Answer 2500 m

2.5×1000=2500, to trail 2500 m lambi hai. 100 se multiply karna (250 m) ek aam galti hai: 100 to metres se centimetres ka number hai.

5.3 Length Naapne ka Sahi Tareeka

Kya tum maachis ki dibbi ko lambe steel tape se naapoge? Ya poore kamre ko 15-cm scale se? Har kaam ke liye ek tool sabse sahi hota hai. Chhoti, seedhi cheezon ke liye chhota scale theek hai. Lambi, seedhi cheezon ke liye metre scale ya steel tape theek hai. Gol cheezon ke liye kuch naram chahiye jo mud sake. Table kuch tools aur unke kaam sort karti hai.

Table 5.2Kaun sa tool, kis kaam ke liye?
ToolKya yeh mudta hai?Kiske liye achha
15-cm scalenahichhoti, seedhi cheezein: maachis ki dibbi, eraser
metre scalenahilambi seedhi cheezein: desk, bed
steel ka measuring tapelipat jaata hai, lekin khinchne par seedha rehta haikamre, darwaze aur deewarein
darzi ka tapehaan, yeh naram haigol cheezein: kamar, sir, kaddu

Phir teen simple rules follow karo.

Scale ko object ke saath-saath rakho

Scale ki marked edge poori lambai mein object ko chhooni chahiye, na koi gap ho na jhukaav. Jhuka hua scale gap chhod deta hai, aur reading galat ho jaati hai. Ends par bhi dhyaan do. Kai scales par zero edge se thoda andar hota hai, isliye plastic ke end se nahi, zero mark se shuru karo.

3/3Scale poori lambai mein crayon ko chhoota hai, 0 se shuru hokar. Sahi length 6.4 cm hai.

Fig. 5.5Sirf teesra tareeka sahi length deta hai.NCERT Fig. 5.4 · p. 84

Ek hara crayon peele 10-cm scale ke upar pada hai. Pehle step mein scale tircha hai, isliye crayon aur scale ke beech gap aa jaata hai, aur ek cross kehta hai tircha: gap aa gaya. Doosre step mein scale seedha hai lekin crayon zero mark ki jagah scale ki edge se shuru hota hai, aur right end 6.0 cm padhta hai, jis par cross hai. Teesre step mein scale zero mark se crayon ko chhoota hai, aur ek tick kehta hai ki length 6.4 cm hai.

Aankh ko mark ke seedha upar rakho

Scale ki kuch motai hoti hai. Isliye jab tum object ke end ko ek side se dekhte ho, to woh galat mark ke saath line up hota lagta hai. Ek side se reading bahut kam aati hai, aur doosri side se bahut zyada. Hamesha apni aankh ko us point ke seedha upar lao jise tum padh rahe ho, jaise Fig. 5.6 mein.

3/3Aankh tip ke seedha upar ho to reading sahi length hai, 8.0 cm.

Fig. 5.6Sahi value padhne ke liye seedha neeche dekho.NCERT Fig. 5.5 · p. 85

Ek mota scale side se dikh raha hai, uske upar 5 se 11 tak marks hain, aur uske saamne ek pencil padi hai jiski tip 8 par hai. Pehle step mein left ki ek aankh dotted line ke saath tip ko dekhti hai, jo marks ko 7.6 cm par kaatti hai, label hai bahut left. Doosre step mein aankh right ki taraf jaati hai aur line 8.4 cm par kaatti hai, label hai bahut right. Teesre step mein aankh tip ke seedha upar hai aur reading sahi 8.0 cm hai.

Agar scale toot jaaye to?

Kadak! Tumhare scale ke pehle do centimetres toot gaye. Kya tumhe naya scale chahiye? Bilkul nahi. Length ko do readings ke beech ka gap samjho. Jab object ka ek end 0 par ho, to door wali reading gap ke barabar hoti hai, isliye tum length seedha padh lete ho. Jab ek end 2 cm par ho, to gap hai door wali reading minus 2. To object ko kisi bhi saaf dikhne wale mark ke saath line up karo, aur subtract karo, jaise Fig. 5.7 mein.

3/3Doosra end 7.8 cm par hai. Length = 7.8 cm − 2.0 cm = 5.8 cm.

Fig. 5.7Kisi bhi saaf mark se shuru karo, phir subtract karo.NCERT Fig. 5.6 · p. 85

Ek peela scale jiska left end toota-phoota hai, 2 mark se thoda pehle shuru hota hai. Pehle step mein ek chaabi toote end ke bahar tak latakti hai, aur words kehte hain ki 0 wala end toot gaya hai. Doosre step mein chaabi right ki taraf khisakti hai jab tak uske gol end ki edge 2.0 cm mark par na aa jaaye, jo dashed line se dikhaya gaya hai. Teesre step mein doosri dashed line chaabi ki tip ko 7.8 cm par mark karti hai, aur length nikaali jaati hai 7.8 minus 2.0, yaani 5.8 cm.

Example

Toote scale par ek pankh

Ishaan ka scale zero wale end par toota hua hai. Woh ek chhote pankh ka ek end 4.0 cm mark par rakhta hai. Pankh ka doosra end 13.1 cm tak pahunchta hai. Pankh kitna lamba hai?

Pehle khud try karo. Phir solution ek-ek step karke kholo.

InteractiveRuler lab

Ek interactive 15-cm scale jis par pencil, eraser, chaabi ya patta pada hai. Tum object ko scale ke saath drag kar sakte ho ya buttons se 1 mm khiska sakte ho. Do magnifiers left end aur right end ko paas se dikhate hain. Tum length centimetres mein type karke Check dabate ho, aur feedback batata hai ki kahin tum starting reading subtract karna to nahi bhool gaye. Broken scale option scale ke pehle 2.6 cm hata deta hai. Doosra tab side se mota ya patla scale aur pencil dikhata hai, saath mein ek aankh jise tum left-right khiska sakte ho; dotted line of sight woh reading dikhati hai jo tumhe dikhegi, sahi 8.0 cm ke muqable.

Fig. 5.8Yeh try karo: (1) Pencil ko drag karo jab tak uska left end 0 par na aa jaaye, phir right end se uski length seedha padho. (2) Broken scale chuno, patte ka ek end 3 cm par rakho aur subtract karo. (3) Where’s your eye? kholo aur aankh ko bilkul left tak khiskao. Reading kitni galat aati hai? Ab Thin scale chuno. Galti badi hui ya chhoti?
Compare

Scientist ki tarah length likhna

Aise likho

  • 12 cm: number ke baad gap chhodo
  • 5 km: ek se zyada ke liye s nahi
  • 40 mm: symbol ke liye chhote letters
  • metre, centimetre: naamon ke liye bhi chhote letters
  • Rassi 2 m lambi hai: symbol ke baad full stop nahi

Aise nahi

  • 12cm
  • 5 kms
  • 40 MM
  • Metre, Centimetre (sentence ke beech mein)
  • Rassi 2 m. lambi hai
Quick check
4 mein se 1
Scale par pencil ka end padhte waqt tumhari aankh kahan honi chahiye?
Answer dekho

Answer (B) End ke seedha upar

Sirf seedha upar se dekhne par sahi reading milti hai. Kisi bhi side se dekhne par end galat mark ke saath line up lagta hai.

5.4 Curved Line ki Length Naapna

Darzi sakht scale ki jagah naram tape kyun use karte hain? Kyunki jo cheezein hum naapna chahte hain, unmein se kai seedhi nahi hoti. Rangoli ka ghumaavdaar border, choodi ka kinaara, ya map par bal khaati nadi ke baare mein socho. Sakht scale curve ke saath mud nahi sakta.

Naram tape measure khud hi curve ke saath chal sakta hai. Ghar par naram tape nahi hai? Saada dhaaga bhi utna hi achha kaam karta hai, jaise Fig. 5.9 dikhata hai. Dhaage ko curve ke saath thoda-thoda dabaate jaao, aur jahan curve shuru aur khatam hota hai wahan mark karo. Seedha khinchne ke baad scale dono marks ke beech ka gap naap sakta hai.

4/4Use scale ke saath rakho. Marks ke beech 24.5 cm ka gap hai, to saanp 24.5 cm lamba hai.

Fig. 5.9Curve ke saath chalo, ends mark karo, seedha karo, naapo.NCERT Fig. 5.8 · p. 87

Figure ke upar ek hara lehraata saanp bana hai. Pehle step mein ek sawaal poochta hai ki woh kitna lamba hai. Doosre step mein ek orange dhaaga saanp ke shareer ke saath pada hai, poonch aur sir par kaale ink ke dots hain. Teesre step mein saanp par pada dhaaga dhundhla ho jaata hai aur uske neeche ek seedha orange dhaaga dikhta hai, jiske ends par dono dots hain. Aakhri step mein seedhe dhaage ke neeche 0 se 25 cm tak ka scale aata hai, aur words kehte hain ki mark se mark tak dhaaga 24.5 cm hai.

Example

Gol dhakkan ke liye lace

Meera ek gol tin ke dhakkan ke kinaare par chaaron taraf lace chipkana chahti hai. Woh kinaare ke chaaron taraf ek baar dhaaga lapetti hai aur jahan dhaaga khud se milta hai wahan mark karti hai. Metre scale par dono marks 12.0 cm aur 37.5 cm par hain. Use kitni lace chahiye?

Pehle khud try karo. Phir solution ek-ek step karke kholo.

Pahiye ka rim bhi ek curve hai, aur isse lambi distances naapne ki ek badhiya trick milti hai. Har baar jab pahiya ek chakkar ghoomta hai, woh bilkul apne rim ki length jitna aage ludhakta hai, jaise Fig. 5.10 dikhata hai.

3/3Ek chakkar mein tay ki gayi zameen rim ki length ke barabar hai, jaise tyre ko sadak par khol kar bichha diya ho.

Fig. 5.10Pahiye ka ek chakkar zameen par ek rim length tay karta hai.NCERT Fig. 5.23 · p. 100

Left mein ek spokes wala pahiya zameen par khada hai, jahan tyre zameen ko chhoota hai wahan ek orange dot hai, aur ek box mein likha hai turns: 0. Doosre step mein pahiya right ki taraf ludhak gaya hai, dot phir se neeche hai, ek dashed circle dikhata hai ki woh kahan se shuru hua tha, box mein likha hai turns: 1, aur zameen ke neeche ek arrow par label hai ek chakkar mein distance. Aakhri step mein zameen ke saath ek orange line dono chhoone wale points ko jodti hai, aur words kehte hain ki ek chakkar ek rim length tay karta hai.

Example

Pahiye ke chakkar ginna

Kabir apni cycle ke aage wale pahiye ka rim ek dori se naapta hai. Woh 2 m 10 cm lamba hai. Woh ek spoke par ribbon baandhta hai aur cycle ko paidal market tak le jaata hai, aur ginta hai ki ribbon kitni baar upar aata hai. Woh 500 chakkar ginta hai. Market kitni door hai?

Pehle khud try karo. Phir solution ek-ek step karke kholo.

Quick check
3 mein se 1
Dhaage se curved line naapne ke steps ko sahi order mein lagao.
  1. Dhaage par wahan mark karo jahan curve shuru aur khatam hota hai
  2. Dhaage ko scale ke saath seedha khincho
  3. Dono marks ke beech ki length padho
  4. Dhaage ko curve ke saath mod-dar-mod rakho
Answer dekho
Answer
  1. Dhaage ko curve ke saath mod-dar-mod rakho
  2. Dhaage par wahan mark karo jahan curve shuru aur khatam hota hai
  3. Dhaage ko scale ke saath seedha khincho
  4. Dono marks ke beech ki length padho
Pehle dhaaga curve ki nakal karta hai. Ends mark karne ke baad hi tum use seedha karke marks ke beech naapte ho.

5.5 Position Batana

Tum library dhoondh rahe ho. Chai ki dukaan wala ishaara karke kehta hai, “Bas 300 m us taraf.” Thoda peeche, bus stop par ek bus conductor kehta hai, “Is road par 800 m aage hai.”

Dono numbers match nahi karte, phir bhi dono mein se koi galat nahi hai. Distance ke hamesha do ends hote hain, aur har aadmi ne ek end wahan rakha jahan woh khada tha. Bas chai ki dukaan bus stop ke muqable library ke zyada paas hai. Ise Fig. 5.11 mein dekho.

3/3Mandir ke gate ko reference point chuno. Ab sab agree karte hain: usse bus stop 200 m, chai ki dukaan 700 m, library 1000 m.

Fig. 5.11Distances is par depend karti hain ki tum kahan se naap rahe ho.NCERT Fig. 5.9 · p. 87

Figure mein ek seedhi sadak hai jiske kinaare chaar jagahein hain: jhande wala mandir, bus stop ka board, chai ki dukaan aur library. Pehle step mein chai ki dukaan se library tak ke arrow par 300 m likha hai. Doosre step mein bus stop se library tak ke arrow par 800 m likha hai. Aakhri step mein mandir par ek pin ka label reference point hai, aur sadak ke neeche ek scale har jagah ki mandir se distance deta hai: 0 m, 200 m, 700 m aur 1000 m.

Position aise batane ke liye ki koi confuse na ho, hum pehle ek fixed jagah chunte hain. Phir har distance (दूरी) usi jagah se batate hain. Woh mani hui fixed jagah hamara reference point (संदर्भ बिंदु) hai. Fig. 5.11 mein mandir ka gate achha reference point hai. Sab use jaante hain, aur woh kabhi hilta nahi.

Definition
Reference point

Ek fixed cheez ya jagah jisse hum distances naapte hain, taaki sab positions ko ek hi tarah batayein.

Example“Library mandir ke gate se 1000 m door hai.” Yahan mandir ka gate reference point hai.

Highways par tumhe ek aur tarah ka reference point milta hai. Sadak kinaare chhote patthar, jinhe milestones ya kilometre stones kehte hain, ek shehar ka naam aur ek number dikhate hain. “Mysuru 48” likhe patthar ka matlab hai ki Mysuru 48 km door hai. Shehar reference point hai, aur patthar tumhe usse tumhari position batata hai (Fig. 5.12).

3/3Ab Mysuru 12. Samay ke saath car ki position badalti rehti hai, kyunki car move kar rahi hai.

Fig. 5.12Har milestone batata hai ki tum Mysuru se kitni door ho.NCERT Fig. 5.13 · p. 89

Sadak ke kinaare rangeen top wale teen milestones khade hain, jin par Mysuru 48, Mysuru 35 aur Mysuru 12 likha hai, aur right mein ek arrow Mysuru ki taraf point karta hai. Pehle step mein ek neeli car pehle patthar ke paas hai, jiske chaaron taraf outline hai, aur words kehte hain ki tum Mysuru se 48 km door ho. Doosre step mein car doosre patthar tak aa gayi hai aur words kehte hain 35 km. Teesre step mein woh aakhri patthar ke paas hai aur words kehte hain 12 km.

Quick check
3 mein se 1
Ek seedhi sadak par school post office se 900 m door hai. Park post office se 350 m door hai, usi side par. School aur park ke beech kitni distance hai?
m
Answer dekho

Answer 550 m

Dono distances ek hi reference point se, ek hi side par naapi gayi hain, isliye subtract karo: 900−350=550. Unhe jodna (1250 m) tabhi sahi hota jab dono jagahein post office ki ulti sides par hoti.

5.6 Chalti Cheezein

Ek minute ke liye khidki se bahar dekho. Kuch cheezein move kar rahi hain: chidiya, cycle, hawa mein patte. Kuch cheezein ruki hain: deewar, khadi scooter, lamp post. Tum kaise tay karte ho ki kaun kya hai?

Scientists bhi yahi test use karte hain. Ek reference point chuno aur thodi der dekho. Kya us point ke muqable cheez ki position badalti rehti hai? To cheez motion (गति) mein hai. Kya uski position same rehti hai? To woh rest (विरामावस्था) mein hai. Yeh test Fig. 5.13 par try karo, ek gali ki do photos jo paanch second ke fark se li gayi hain.

Definition
Motion

Samay ke saath, kisi reference point ke muqable object ki position mein badlaav. Jis object ki position nahi badalti, woh rest mein hai.

ExampleLamp post ke muqable guzarta cyclist motion mein hai aur khadi scooter rest mein hai.

3/3Cyclist aur patang ne lamp post ke muqable position badli, isliye woh motion mein hain. Scooter aur gaay ne nahi badli, isliye woh rest mein hain.

Fig. 5.13Lamp post ko reference point maan kar dono photos compare karo.

Ek gali ka scene jismein left mein lamp post hai, ek khadi scooter, ek cyclist, zameen par baithi ek gaay aur aasmaan mein ek patang. Pehle step ka label hai photo 1, time 0 s. Doosre step mein, jiska label 5 s baad hai, cyclist right ki taraf chala gaya hai aur patang upar aur right ki taraf chali gayi hai, jabki scooter aur gaay wahin hain jahan the. Aakhri step mein halki copies cyclist aur patang ki purani positions dikhati hain, saath mein moved likhe arrows, aur scooter aur gaay par same place likha hai.

Ab ek paheli. Tum ek train mein baithe ho jo station se dheere-dheere nikal rahi hai. Tumhara dost Arjun do seat door baitha hai. Kya Arjun move kar raha hai? Answer dene se pehle neeche wala interactive try karo.

InteractiveKiska view?

Platform se nikalti dheemi train ka animated side view. Tum aur tumhara dost Arjun coach ke andar 2 m ki doori par baithe ho, aur platform par ek chai wala khada hai. Do buttons chunte hain ki camera kahan fixed hai: platform par ya tumhari seat par. Play, step aur restart buttons train chalate hain. Do cards dikhate hain Arjun ki tumse distance, jo 2.0 m hi rehti hai, aur chai wale se uski distance, jo badalti rehti hai. Ek message samjhata hai ki chune gaye reference point ke liye kaun move kar raha hai.

Fig. 5.14Yeh try karo: (1) Platform se dekhte hue Play dabao. Dono distances mein se kaun si badalti hai? (2) your seat in the train chuno aur phir se play karo. Ab kaun move karta lagta hai: Arjun ya chai wala?NCERT Aur jaano! · p. 91

Arjun ki tumse distance poore samay 2 m rehti hai. To tumhe reference point maanein to Arjun rest mein hai. Lekin chai wale se uski distance badalti rehti hai. To platform ko reference point maanein to Arjun motion mein hai. Ek hi pal mein dono baatein sach hain! Koi cheez move kar rahi hai ya nahi, yeh is par depend karta hai ki tum kaun sa reference point chunte ho.

Quick check
3 mein se 1
Riya ek chalti bus mein baithi hai. Inmein se kiske muqable Riya rest mein hai?
Answer dekho

Answer (C) Woh seat jis par woh baithi hai

Riya ki seat uske saath move karti hai, isliye seat ke muqable uski position nahi badalti. Ped, bus stop ya gaay ke muqable uski position badalti rehti hai.

5.7 Motion ke Types

Girta aam, ghoomta ceiling fan, aage-peeche jaata jhoola: teeno move kar rahe hain, lekin bahut alag tareekon se. Scientists motion ko us raaste ke shape se sort karte hain jis par object chalta hai. Chalo, teen tarah ke motion dekhein.

Seedhi line mein move karna

Seedhi line wala raasta sabse simple tarah ka motion deta hai, jise linear motion (रैखिक गति) kehte hain. Kuen se upar kheenchi baalti, seedhe takhte par neeche ludhakti ball aur seedhi sadak par bus, sab yahi dikhate hain (Fig. 5.15). Line upar, neeche, side mein ya tirchi, kisi bhi taraf ho sakti hai.

Definition
Linear motion

Seedhi line mein motion.

ExampleKuen se seedhi upar kheenchi baalti; seedhe track par train.

3/3Start aur finish ko jodo: har raasta seedhi line hai, chahe kisi bhi taraf point kare. Yahi linear motion hai.

Fig. 5.15Upar, dhalaan se neeche ya sadak ke saath: har raasta seedhi line hai.NCERT Fig. 5.14 · p. 92

Left mein eenton ke kuen ke upar pulley se rassi par ek baalti latki hai; beech mein ek ball crate par tike takhte ke upar rakhi hai; aage ki taraf ek bus seedhi sadak ke left end par khadi hai. Doosre step mein baalti pulley tak upar aa gayi hai, ball takhte ke neeche tak ludhak gayi hai aur bus right ki taraf chali gayi hai, aur shuru wali jagahon par halki copies reh gayi hain. Aakhri step mein dashed orange arrows start aur finish ko jodte hain: ek seedha upar point karta hai, ek takhte ke saath neeche dhalaan mein jaata hai aur ek sadak ke saath barabar chalta hai, aur teeno seedhe hain.

Circle mein move karna

Kuch cheezein kahin pahunchti nahi, phir bhi kabhi rukti nahi. Mele ka merry-go-round ya ceiling fan ke blades socho: woh bas gol-gol ghoomte rehte hain.

Circle mein gol-gol ghoomne ko circular motion (वृत्तीय गति) kehte hain. Fan blade ki tip, giant wheel ka cabin, kumhaar ke chaak par ek nishaan aur ghadi ki sui ki tip, sab circles mein move karte hain (Fig. 5.16).

Definition
Circular motion

Kisi centre ke chaaron taraf circle mein motion.

ExampleFan blade ki tip; giant wheel ka cabin.

3/3Ek poore chakkar ke baad har dot start par wapas aa jaata hai. Uska raasta circle hai: circular motion.

Fig. 5.16Har dot wahin wapas aata rehta hai jahan se shuru hua tha.NCERT Fig. 5.15 · p. 93

Left mein teen blades wala ceiling fan neeche se dikh raha hai, ek blade ki tip par dot hai; right mein ek ghadi ke face par second wali sui hai jiski tip par dot hai, 12 se shuru. Doosre step mein fan aur sui dono thoda ghoom gaye hain, aur dashed orange arcs dots ke curved raaste dikhate hain. Aakhri step mein dono dots wahin wapas hain jahan se shuru hue the, aur har dot ka poora raasta dashed circle ke roop mein bana hai.

Quick check
2 mein se 1
Ek ladki bilkul seedhi sadak par cycle chalati hai. Poori cycle ka motion kis tarah ka hai?
Answer dekho

Answer (A) Linear motion

Poori cycle seedhi line mein chalti hai, isliye uska motion linear hai, bhale hi uske pahiye ghoom rahe hon.

Aage-peeche move karna

Ab jhoole ke baare mein socho. Woh aage jaata hai, wapas aata hai, phir aage jaata hai, baar-baar. Uska raasta na poora circle hai, na lambi seedhi line.

Beech ki position ke dono taraf baar-baar aage-peeche move karne ko oscillatory motion (दोलन गति) kehte hain. Jhoole ya latakti chaabi ke liye beech ki position woh hai jahan woh akele chhod dene par shaant latakti hai. Jhoola, deewar ghadi ka pendulum, see-saw aur chhedi hui guitar string, sab oscillate karte hain.

Definition
Oscillatory motion

Beech ki position ke aas-paas baar-baar aage-peeche motion.

ExampleJhoola; deewar ghadi ka pendulum.

4/4Woh beech ki position ke aas-paas aage-peeche hilte rehte hain: oscillatory motion.

Fig. 5.17Side mein kheench kar chhodne par har ek apni beech ki position ke aas-paas aage-peeche hilta hai.NCERT Fig. 5.16 · p. 93

Left mein ek bar se dori par ek bob latka hai, aur ek dashed line beech ki position mark karti hai; right mein ek haath ruler ko desk par sapaat dabata hai aur uska khula end edge se bahar nikla hai. Pehle step mein dono rest mein hain. Doosre step mein bob left ki taraf kheencha gaya hai aur ruler ka khula end neeche dabaya gaya hai. Teesre step mein bob right ki taraf jhool gaya hai aur ruler ka end upar uchhal gaya hai. Aakhri step mein halki copies dono sides dikhati hain, curved aur seedhe double arrows ke saath, aur words kehte hain aage-peeche, baar-baar.

Tik, tok, tik, tok. Pendulum wali ghadi time isliye theek rakhti hai kyunki uska pendulum har jhoole mein same time leta hai. Jo motion barabar time ke gaps ke baad khud ko dohraata hai, use periodic motion (आवर्ती गति) kehte hain. Steady speed par chalta fan aur dheere se dhakela gaya jhoola bhi periodic hain. To circular aur oscillatory motions aksar periodic hote hain. Girta aam periodic nahi hai: woh ek baar girta hai aur ruk jaata hai.

Definition
Periodic motion

Aisa motion jo barabar time intervals ke baad khud ko dohraata hai.

ExampleJhoolta pendulum; ghadi ki second wali sui ki tip.

1/3Giant wheel, swing boat, slide aur toy train. Aage badhne se pehle har ek ka motion tay karo.

Fig. 5.18Har ride kis tarah ka motion dikhati hai?NCERT Fig. 5.18 · p. 95

Mele ke scene mein chhe cabins wala giant wheel hai, A-shape ke frame se latki swing boat hai, seedhi wali slide jiske upar ek bachcha hai, aur neeche seedhe track par ek toy train hai. Doosre step mein dashed orange raaste dikhte hain: giant wheel ke chaaron taraf circle, swing boat ke neeche chhota curved double arrow, slide ke neeche ki taraf seedha arrow aur track ke saath seedha arrow. Aakhri step mein labels motions ke naam batate hain: giant wheel ke liye circular, swing boat ke liye oscillatory, aur slide aur toy train ke liye linear.

InteractiveMotion sorter

Ek animated sorter jo ek-ek karke nau chalti cheezein dikhata hai: jhoola, ceiling fan, girta aam, silai machine ki sui, lift, kumhaar ka chaak, ghadi ka pendulum, toy train aur giant wheel. Har ek par ek chamakta dot ek point mark karta hai. Trace the path button dot ke peeche dotted lakeer chhodta hai, jo seedhi line, circle ya aage-peeche wala arc dikhati hai. Tum linear, circular ya oscillatory chunte ho, aur feedback answer samjhata hai aur batata hai ki motion periodic hai ya nahi. Aakhri table tumhare saare answers dikhati hai.

Fig. 5.19Yeh try karo: Trace the path tap karo aur kuch second tak dot ko dekho. Seedhi line matlab linear, poora circle matlab circular, aur aage-peeche chala gaya chhota raasta matlab oscillatory. Saari nau cheezein sort karo.
Quick check
4 mein se 1
Har chalti cheez ko uske motion ke type se match karo.

Left mein koi item tap karo, phir right mein uska match.

Answer dekho
Answer
  • deewar ghadi ka pendulum : oscillatory
  • daal se girta aam : linear
  • giant wheel ka cabin : circular
Pendulum apni beech ki position ke aas-paas aage-peeche jhoolta hai, aam seedhi line mein girta hai, aur cabin circle mein ghoomta hai.
Flash cards · 15

Keywords

1 / 15
Recap

Summary aur key points

  1. Handspan ya kadam jaisi shareer ki units har insaan ki alag hoti hain, isliye same length ke alag-alag numbers aate hain (Section 5.1).
  2. Har measurement mein ek number aur ek unit hoti hai, jinke beech space hota hai: 12 cm.
  3. Desh standard units ka ek common set use karte hain, jise SI units kehte hain. SI units mein length metres, m, mein naapi jaati hai (Section 5.2).
  4. 10 mm se 1 cm banta hai, 100 cm se 1 m, aur 1000 m se 1 km. Chhoti unit mein badalne ke liye multiply karo; badi unit mein badalne ke liye divide karo (Fig. 5.4).
  5. Sahi naapne ke liye sahi tool chuno, scale ko object ke saath kisi saaf mark se rakho aur reading ko seedha upar se dekho (Section 5.3).
  6. Toote scale ke saath kisi bhi poore mark se shuru karo aur end wali reading mein se woh reading subtract karo (Fig. 5.7).
  7. Curved line ko flexible tape se naap sakte hain, ya aise dhaage se jise baad mein scale ke saath seedha kiya jaaye (Section 5.4).
  8. Reference point ek fixed jagah hai jisse hum distances aur positions batate hain (Section 5.5).
  9. Koi cheez motion mein hai jab reference point ke muqable uski position badalti rehti hai, aur rest mein hai jab nahi badalti (Section 5.6).
  10. Koi cheez move kar rahi hai ya nahi, yeh reference point par depend karta hai: passenger train ke muqable rest mein hai, lekin platform ke muqable motion mein (Fig. 5.14).
  11. Seedhi line mein motion linear hai, circle mein circular hai, aur beech ki position ke aas-paas aage-peeche oscillatory hai (Section 5.7).
  12. Jo motion barabar time intervals ke baad dohraata hai, woh periodic hai. Kai circular aur oscillatory motions periodic hote hain.
Fig. 5.20Question 11 ke liye marble run.NCERT Fig. 5.19 · p. 98

Ek marble point P par seedhi khadi transparent tube ke upar rakhi hai. Tube seedhi neeche point Q tak jaati hai, jahan track mudkar right ki taraf sapaat chalta hai. Point R par sapaat track ek baar gol loop mein ghoomta hai, phir aage ek curved bowl tak jaata hai jiska sabse neeche wala point S hai. Bowl ki doosri side zyada oonchi uthti hai aur ek chhote stop par khatam hoti hai.

Practice · 17 questions

Practice questions answers ke saath (NCERT “Chalo, apni samajh aur badhayein”)

  1. Quick answerEasyNCERT Exercises Q1

    Har length ko us unit se match karo jo use naapne ke liye sabse sahi hai.

    Left mein koi item tap karo, phir right mein uska match.

    Answer dekho
    Answer
    • Kochi se Thiruvananthapuram ki distance : kilometre
    • cricket pitch ki length : metre
    • tumhare angoothe ki length : centimetre
    • pencil lead ki motai : millimetre
    Woh unit chuno jo simple number de: sadak se dono shehar lagbhag 200 kilometres door hain, pitch lagbhag 20 m lambi hoti hai, angootha kuch centimetres ka hota hai aur pencil lead ek-do millimetre moti hoti hai.
  2. Short answerEasyNCERT Exercises Q2

    True ya false?

    1. Pul se nadi mein giraya gaya patthar linear motion mein move karta hai.

      Answer dekho

      Answer Sahi

      Woh seedhi line mein girta hai.

    2. Chalti bus mein chupchaap baitha ladka sadak ke muqable rest mein hai.

      Answer dekho

      Answer Galat

      Sadak ke muqable uski position badalti rehti hai, isliye woh motion mein hai. Woh sirf bus ke muqable rest mein hai.

    3. 1 m=1000 mm

      Answer dekho

      Answer Sahi

      1 m=100 cm aur 1 cm=10 mm, to 1 m=100×10=1000 mm.

    4. 5 km=500 m

      Answer dekho

      Answer Galat

      5 km=5×1000=5000 m.
  3. Quick answerEasyNCERT Exercises Q3

    Inmein se kaun si length ki standard units hain? Jitni bhi hain, sab chuno.

    Saare sahi options chuno
    Answer dekho
    Answer
    • (A) kilometre
    • (C) metre
    • (E) millimetre
    Kilometre, metre aur millimetre sabke liye same size ke hain. Haath aur kadam is par depend karte hain ki kiski baanh ya pair use hua, isliye woh standard nahi hain.
  4. ActivityMediumNCERT Exercises Q4

    Measuring tools aur unka sabse chhota step.

    1. Steel tape par do numbered centimetre marks ke beech ka gap 10 barabar hisson mein bata hai. Tum us par sabse chhoti kitni length padh sakte ho?

      Answer dekho

      Answer (B) 1 mm

      1 cm ke 10 barabar hisse, har ek 1 mm ka.

    2. Sabse chhota step dhoondhne ka khel khelo. Ghar aur school mein jitne ho sakein, length naapne wale tools jama karo. Har ek par do lines ke beech ka sabse chhota gap dhoondho. Teen columns wali table banao: tool, maine kahan paaya, sabse chhota step. Kaun sa tool sabse baareek naap sakta hai?

      Solution dikhao

      Tumhari table mein yeh ho sakte hain: geometry box ka 15-cm scale, 1 mm; class ka metre scale, aksar 1 mm lekin kabhi sirf 1 cm; darzi ka tape, aam taur par 1 mm ya 5 mm; toolbox ka steel tape, 1 mm.

      Sabse chhota step pata karne ke liye do lines ke beech ka sabse chhota gap dekho, aur gino ki aise kitne gaps se 1 cm banta hai. Zyadatar tools par sabse baareek step 1 mm hota hai.

  5. Quick answerEasyNCERT Exercises Q5

    Meena ka ghar mandir se 2.3 km door hai. Metres mein yeh kitna hua?

    m
    Answer dekho

    Answer 2300 m

    2.3×1000=2300, to distance 2300 m hai.
  6. ActivityMediumNCERT Exercises Q6

    Katori ke chaaron taraf naapna.

    1. Batao ki tum dhaage aur scale se gol steel ki katori (bowl) ke kinaare ki length kaise naapoge.

      Solution dikhao
      1. Kinaare ke chaaron taraf ek baar dhaaga lapeto, use tight aur edge par rakhte hue.
      2. Dhaage par wahan mark karo jahan woh apne starting point se milta hai.
      3. Dhaage ko scale ke saath seedha karo aur dono marks ke beech ki length padho. Agar pehla mark 0 par nahi hai, to subtract karo.

    2. Rohan yahi karta hai. Uske metre scale par dhaage ke dono marks 5.0 cm aur 44.6 cm par hain. Kinaara kitne cm lamba hai?

      cm
      Answer dekho

      Answer 39.6 cm

      44.6−5.0=39.6, to kinaara 39.6 cm lamba hai.
  7. Quick answerMediumNCERT Exercises Q7

    Market se laaya ganna 1 m 64 cm lamba hai. Har unit mein uski length likho.

    1. centimetres mein

      cm
      Answer dekho

      Answer 164 cm

      100 cm+64 cm=164 cm.

    2. metres mein

      m
      Answer dekho

      Answer 1.64 m

      164÷100=1.64, to yeh 1.64 m hai.

    3. millimetres mein

      mm
      Answer dekho

      Answer 1640 mm

      164×10=1640, to yeh 1640 mm hai.
  8. ActivityMediumNCERT Exercises Q8

    Pehle andaaza lagao, phir check karo. Steel ki tray ki lambi edge 28 cm hai. Tumhara har eraser 3.5 cm lamba hai.

    1. Calculate karne se pehle guess karo: bina gap ke ek ke baad ek rakhe kitne erasers edge ko dhak denge?

      Solution dikhao

      Koi bhi samajhdaar guess theek hai. 3.5 cm, 3 cm se thoda zyada hai, aur 28 ÷ 3, 9 se thoda zyada hai, isliye 8 ya 9 achha guess hai.

    2. Ab exact nikaalo. Kitne erasers chahiye?

      erasers
      Answer dekho

      Answer 8 erasers

      28÷3.5=8 erasers.

    3. Sach mein try karo. Guess karo ki kitni nayi pencils, ek ke baad ek rakhi, darwaze ke aar-paar pahunchengi. Phir 30-cm scale se ek pencil aur measuring tape se darwaza naapo, aur apna guess check karo.

      Solution dikhao

      Darwaze ki chaudai ko ek pencil ki length se divide karo. Agar answer poora number nahi hai, to aakhri pencil thodi bahar niklegi ya chhota gap chhodegi.

  9. Short answerEasyNCERT Exercises Q9

    Ghar par aur school ke raaste mein motion ki khoj karo. Do cheezein dhoondho jo seedhi line mein move karti hain, do jo circle mein ghoomti hain aur do jo aage-peeche hilti hain. Aisi cheezein dhoondhne ki koshish karo jo is chapter mein nahi hain.

    Solution dikhao

    AnswerSample answers: linear, bahar kheencha jaata drawer aur seedhe corridor mein chalta insaan; circular, washing machine ka drum aur merry-go-round; oscillatory, jhoolta hua bachche ka paalna aur hawa mein hilti daal.

    Har example ko uske raaste se check karo. Seedha raasta linear hai, centre ke chaaron taraf ka raasta circular hai, aur beech ki position ke aas-paas aage-peeche ka raasta oscillatory hai.

  10. Short answerMediumNCERT Exercises Q10

    Har object ke liye sabse aasaan unit kaun si hai: mm, cm ya m?

    1. ₹5 ke sikke ki motai

      Answer dekho

      Answer (A) mm

      Sikka sirf ek-do millimetre mota hota hai.

    2. school bus ki length

      Answer dekho

      Answer (C) m

      Bus kai metres lambi hoti hai.

    3. kanghi ki length

      Answer dekho

      Answer (B) cm

      Kanghi lagbhag 10 se 20 cm lambi hoti hai, isliye centimetres se simple number milta hai.

    4. Har unit ke liye apni taraf se teen objects likho.

      Solution dikhao

      Sample answers: mm, chawal ka daana, sarson ka daana aur pencil lead; cm, kela, kitaab aur chammach; m, kamra, jhande ka khamba aur train ka coach.

  11. DiagramMediumNCERT Exercises Q11

    Fig. 5.20 ke marble run mein P par tube mein ek marble giraayi jaati hai. Woh seedhi neeche Q tak girti hai, sapaat track par R tak ludhakti hai, ek baar loop mein ghoomti hai aur ludhak kar bowl mein chali jaati hai. Wahan woh S ke aas-paas aage-peeche hilti hai jab tak ruk nahi jaati. Har hisse par motion ka type batao.

    1. tube mein neeche girna, P se Q tak

      Answer dekho

      Answer (A) linear

      Tube seedhi aur khadi hai, isliye marble seedhi line mein girti hai: linear motion.

    2. sapaat track par, Q se R tak

      Answer dekho

      Answer (A) linear

      Sapaat track seedha hai, isliye motion phir se linear hai.

    3. R par loop mein ek baar ghoomna

      Answer dekho

      Answer (B) circular

      Loop ek circle hai, isliye yeh hissa circular motion hai.

    4. bowl mein, S ke aas-paas

      Answer dekho

      Answer (C) oscillatory

      Marble sabse neeche wale point S ke aas-paas aage-peeche hilti hai, isliye yeh oscillatory motion hai.
  12. Short answerMediumNCERT Exercises Q12

    Haftewaar bazaar mein ek kapda bechne wali ko 1 metre ki nayi measuring strip chahiye. Woh use bamboo ki patti, mote cardboard ki patti, bunai wali oon ke tukde, puraani cycle tube se kaati gayi band, ya aluminium ki patti par mark kar sakti hai.

    1. Kin strips se woh anjaane mein hi alag-alag customers ko alag-alag maatra mein kapda de sakti hai?

      Saare sahi options chuno
      Answer dekho
      Answer
      • (C) bunai wali oon
      • (D) cycle-tube ki rubber
      Oon aur rubber khinchte aur latakte hain, isliye unse bani strip fixed length nahi rakh sakti.

    2. Wajah samjhao.

      Solution dikhao

      Measuring strip har baar use karne par bilkul same length ki honi chahiye. Oon dheeli hoti hai aur kheenchne par khinch jaati hai, aur cycle tube ki rubber to bahut khinchti hai. Usne jo length naapi, woh is par depend karti ki usne kitni zor se kheencha, isliye kuch customers ko doosron se zyada kapda milta. Bamboo, cardboard aur aluminium apni length rakhte hain, isliye unse imaandaar measuring strips banti hain.

  13. ActivityHardNCERT Exercises Q13

    Do se chaar players ke liye ek card game banao jismein alag-alag units mein likhi same length pehchaan kar jeette hain. Uske rules likho.

    Solution dikhao

    Ek idea yeh hai, jiska naam hai Unit Pairs. 24 cards pairs mein banao jo same length dikhayein, jaise 1 km aur 1000 m, 2.5 m aur 250 cm, 30 mm aur 3 cm, ya 1.2 km aur 1200 m.

    Cards ko shuffle karke ulta bichha do. Players baari-baari do cards palatte hain. Agar dono cards same length dikhate hain, to player woh pair rakh leta hai aur use ek aur baari milti hai. Agar nahi, to cards wapas ulte kar diye jaate hain. Jiske paas sabse zyada pairs hon, woh jeetta hai. Mushkil game ke liye 1 m 5 cm aur 105 cm jaise cards jodo.

  14. Quick answerMedium

    Ek pencil aise scale par padi hai jiske pehle 2 cm toot gaye hain. Pencil ka ek end 3.0 cm mark par hai aur doosra end 11.6 cm mark par. Pencil kitne cm lambi hai?

    cm
    Answer dekho

    Answer 8.6 cm

    11.6−3.0=8.6, to pencil 8.6 cm lambi hai.
  15. Quick answerMedium

    Teen dost ek mote scale par usi pencil ka end padhte hain. Sana ko 8.3 cm mila aur Pooja ko 8.7 cm, dono ne side se dekha. Jai ne seedha neeche dekha aur use 8.5 cm mila. Kaun si reading sahi hai?

    Answer dekho

    Answer (B) 8.5 cm (Jai)

    Sirf woh reading sahi hai jo mark ke seedha upar aankh rakh kar li gayi ho. Sana aur Pooja ne sides se dekha, isliye unki readings bahut kam aur bahut zyada hain.
  16. Quick answerMedium

    Ek bus “Nagpur 15” likhe milestone ke paas se guzarti hai. Das minute baad woh “Nagpur 8” likhe milestone ke paas se guzarti hai. Dono pattharon ke beech bus ne kitne kilometres tay kiye?

    km
    Answer dekho

    Answer 7 km

    15−8=7 km. Numbers chhote hue, isliye bus Nagpur ki taraf ja rahi hai.
  17. Quick answerEasy

    Inmein se kaun periodic motion ke examples hain?

    Saare sahi options chuno
    Answer dekho
    Answer
    • (A) Dost dwara ek jaisi lay mein dhakela gaya jhoola
    • (B) Har din ek baar ghoomti Earth
    • (D) Chalti silai machine ki sui
    Jhoola, ghoomti Earth aur silai machine ki sui barabar time intervals ke baad apna motion dohraate hain. Girta naariyal sirf ek baar girta hai.

Apna NCERT exercise question dhoondo

Hamare practice questions ncert.ai ke liye likhe gaye hain aur NCERT exercises ko follow karte hain. Apni textbook ke question se match karne wala question dhoondo; uska answer uske saath hai.

Tumhari NCERT textbook meinYahan practice question
NCERT Exercises Q1Practice Q1
NCERT Exercises Q2Practice Q2
NCERT Exercises Q3Practice Q3
NCERT Exercises Q4Practice Q4
NCERT Exercises Q5Practice Q5
NCERT Exercises Q6Practice Q6
NCERT Exercises Q7Practice Q7
NCERT Exercises Q8Practice Q8
NCERT Exercises Q9Practice Q9
NCERT Exercises Q10Practice Q10
NCERT Exercises Q11Practice Q11
NCERT Exercises Q12Practice Q12
NCERT Exercises Q13Practice Q13

Quick check: MCQs

  1. 5.1 Hum Kaise Naapte hain?3 questions
  2. 5.2 Standard Units4 questions
  3. Agar scale toot jaaye to?4 questions
  4. 5.4 Curved Line ki Length Naapna3 questions
  5. 5.5 Position Batana3 questions
  6. 5.6 Chalti Cheezein3 questions
  7. Circle mein move karna2 questions
  8. Aage-peeche move karna4 questions
Glossary · 15

Key terms (English + Hindi)

centimetreसेंटीमीटरsenteemeetar
Metre ka sauwan hissa, symbol cm. 1 cm = 10 mm.Chapter mein pehli baar yahan aaya →
circular motionवृत्तीय गतिvritteeya gati
Kisi centre ke chaaron taraf circle mein motion.Chapter mein pehli baar yahan aaya →
distanceदूरीdooree
Do jagahein ya cheezein ek doosre se kitni door hain.Chapter mein pehli baar yahan aaya →
kilometreकिलोमीटरkilomeetar
Lambi distances ke liye unit, symbol km. 1 km = 1000 m.Chapter mein pehli baar yahan aaya →
linear motionरैखिक गतिrekhik gati
Seedhi line mein motion.Chapter mein pehli baar yahan aaya →
measurementमापनmaapan
Kisi cheez ko ek jaani hui maatra, jise unit kehte hain, se compare karke pata karna ki woh kitni badi hai.Chapter mein pehli baar yahan aaya →
metreमीटरmeetar
Length ki SI unit, symbol m. 1 m = 100 cm.Chapter mein pehli baar yahan aaya →
millimetreमिलीमीटरmileemeetar
Centimetre ka dasvan hissa, symbol mm: aam scale par sabse chhota step.Chapter mein pehli baar yahan aaya →
motionगतिgati
Reference point ke muqable samay ke saath position mein badlaav.Chapter mein pehli baar yahan aaya →
oscillatory motionदोलन गतिdolan gati
Beech ki position ke aas-paas baar-baar aage-peeche motion.Chapter mein pehli baar yahan aaya →
periodic motionआवर्ती गतिaavartee gati
Aisa motion jo barabar time intervals ke baad khud ko dohraata hai.Chapter mein pehli baar yahan aaya →
reference pointसंदर्भ बिंदुsandarbh bindu
Ek fixed cheez ya jagah jisse distances aur positions batayi jaati hain.Chapter mein pehli baar yahan aaya →
restविरामावस्थाviraamaavastha
Aise object ki state jiski position reference point ke muqable samay ke saath nahi badalti.Chapter mein pehli baar yahan aaya →
standard unitमानक मात्रकmaanak maatrak
Aisi unit jiska mana hua size har jagah sabke liye same hai. SI units international standard units hain.Chapter mein pehli baar yahan aaya →
unitमात्रकmaatrak
Compare karne ke liye use hone wali fixed maatra, jaise metre. Measurement ko number aur unit ke saath likhte hain.Chapter mein pehli baar yahan aaya →

Tum chapter ke end tak pahunch gaye