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Length ki standard units

Short mein jawab

Standard units wo units hain jo sabke liye ek jaisi hain, baalisht ya kadam ki tarah alag nahi. Desh International System of Units (SI) use karte hain, aur length ki SI unit metre (m) hai. Isi se chhoti aur badi units banti hain: 1 km = 1000 m, 1 m = 100 cm aur 1 cm = 10 mm.

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Body units kaam kyun nahi karti

Log bahut pehle se apne sharir se naapte aaye hain: kapda haath ki lambaai se, khet kadam ya pair gin kar, aur chhoti lambaai angula, yaani ungli ki chaudaai, se. Jab Deepa ki mummy darzi se char angula badhaane ko kehti hain, to unka matlab hai chaar ungliyon ki chaudaai. Chapter mein paanch dost ek hi table ko baalisht se naapte hain aur 13 se 14 tak paanch alag jawab paate hain, kyunki unke haath alag size ke hain.

Ek hi table baalisht se naapi gayi: Padma ko 13 aur Hardeep ko 14 mili, kyunki unke haath alag size ke hain, isliye body units standard nahi hain
Ek table, alag baalisht

Har naap ke do hisse hote hain, ek number aur ek unit. 13 baalisht mein 13 number hai aur baalisht unit. Achhi unit wo hai jo koi bhi naape, nateeja ek hi de, aur baalisht aisi nahi hai.

Kai local units se SI units tak

Bharat mein naapne ka itihaas bahut samriddh hai. Angula, uske multiples, dhanusa aur yojana purane Bharatiya sahitya mein milte hain aur cheezein aur imaaratein banaane aur shehar basaane mein use hote the, aur badhai aur darzi aaj bhi angula use karte hain. Harappa ki jagahon ki khudaai mein nishaan bani aisi cheezein mili hain jo scales ho sakti hain.

Duniya ke alag hisson ne apne-apne system banaaye. Jab log ek jagah se doosri jagah jaane lage, to inse uljhan hone lagi, isliye desh saath aaye aur standard units ka ek saajha set apnaaya: International System of Units, yaani SI units.

Metre aur uska parivaar

Length ki SI unit metre hai, symbol m. Metre scale 100 barabar hisson mein bati hoti hai jinhe centimetre (cm) kehte hain. 15-cm scale par har centimetre 10 chhote hisson mein bata hota hai jinhe millimetre (mm) kehte hain, isliye 1 mm = 0.1 cm. Ek millimetre sabse chhoti length hai jo is scale se naap sakte hain. Do shehron ke beech ki railway line jaisi lambi dooriyon ke liye kilometre (km) use karte hain.

Kilometre se millimetre tak length ki units: chhoti unit mein badalne ke liye 1000, 100 aur 10 se guna, aur badi unit mein badalne ke liye bhaag, har unit ke udaharan ke saath
Length ki units
UnitKitne ke barabar
1 kilometre (km)1000 m
1 metre (m)100 cm, yaani 1000 mm
1 centimetre (cm)10 mm
1 millimetre (mm)0.1 cm

Do shehron ke beech ki doori hazaaron metre hoti hai, aur ek panne ki motaai metre ka bahut hi chhota hissa; dono ke liye metre bojhil hai. Isiliye badi aur chhoti units hoti hain.

Units badalna

Badi unit ko chhoti mein badalne ke liye guna karo; chhoti ko badi mein badalne ke liye bhaag do.

  • 1.5 km = 1.5 × 1000 = 1500 m.
  • 1.42 m lamba dost 1.42 × 100 = 142 cm, yaani 142 × 10 = 1420 mm hai.
  • 75 mm lamba crayon 75 ÷ 10 = 7.5 cm hai.
  • 2500 m ki daud 2500 ÷ 1000 = 2.5 km hai.

Sahi unit chunna

LambaaiSahi unit
Delhi aur Lucknow ke beech ki doorikilometre
School ke maidaan ki lambaaimetre
Rubber (eraser) ki lambaaicentimetre
Sikke ki motaaimillimetre

Inch aur foot

Kuch scales par inch ke nishaan bhi hote hain, jahan 1 inch = 2.54 cm. Inch aur foot jaisi units pehle ke zamaane mein use hoti thi aur kuch log ab bhi use karte hain, par science aur zyaadatar duniya SI units use karti hai.

Length sahi tarah likhna

  • Kilometre, metre, centimetre aur millimetre jaise naam chhote akshar se shuru hote hain, sirf vaakya ki shuruaat ko chhodkar.
  • Inke symbols km, m, cm aur mm bhi chhote akshar mein hote hain aur bahuvachan mein ‘s’ nahi lagta: 5 cm, na ki 5 cms.
  • Symbol ke baad full stop nahi lagta, sirf vaakya ke ant mein.
  • Number aur unit ke beech space chhodo: 9.4 cm.

Scale ka sahi use seekhne ke liye padho length sahi kaise naapein. Textbook ke sawaalon ke liye dekho Chapter 5 ke NCERT solutions; poore chapter ke liye Chapter 5 ke notes.

Practice karo

  1. Inme se length ki standard unit kaunsi nahi hai?

    1. (a) millimetre
    2. (b) centimetre
    3. (c) kilometre
    4. (d) baalisht
    Jawab dekho

    Jawab: (d) baalisht

  2. Ek metre mein kitne centimetre hote hain?

    1. (a) 10
    2. (b) 100
    3. (c) 1000
    4. (d) 2.54
    Jawab dekho

    Jawab: (b) 100

  3. Sikke ki motaai ke liye kaunsi unit theek hai?

    1. (a) kilometre
    2. (b) metre
    3. (c) centimetre
    4. (d) millimetre
    Jawab dekho

    Jawab: (d) millimetre

  4. 1.5 km ko metre mein badlo.

    Jawab dekho

    Jawab: 1.5 × 1000 = 1500 m.

  5. 1.42 m ko centimetre aur millimetre mein badlo.

    Jawab dekho

    Jawab: 1.42 × 100 = 142 cm, aur 142 × 10 = 1420 mm.

Students ke sawal

Length ki SI unit kya hai?

Metre, jiska symbol m hai. SI ka matlab hai International System of Units, yaani naapne ki wo standard units jo deshon ne apnaayi hain.

Standard units ki zaroorat kyun hai?

Baalisht, kadam ya pair jaisi units insaan-insaan mein alag hoti hain, isliye ek hi length ke liye alag log alag number paate hain. Standard units har jagah sabko ek hi nateeja deti hain.

km, m, cm aur mm aapas mein kaise jude hain?

1 km = 1000 m, 1 m = 100 cm aur 1 cm = 10 mm. Isliye 1 m = 1000 mm aur 1 km = 100,000 cm.

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