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Standard Units

Class 6 Science · Chapter 5: Lambai ka Maap aur Gati · NCERT Curiosity section 5.2

Seekho

Duniya bhar ke scientists units ke ek saajhe set par sahmat hue jise International System of Units (SI) kehte hain. Lambai ki SI unit metre (m) hai.

Chhoti lambai ke liye metre ko baant-te hain: 1 m = 100 centimetre (cm), aur 1 cm = 10 millimetre (mm). Lambi doori ke liye kilometre: 1 km = 1000 m.

1 km = 1000 m · 1 m = 100 cm · 1 cm = 10 mm

Kaam ke hisaab se unit chuno: sikke ki motaai ke liye mm, pencil ke liye cm, kamre ya cricket pitch ke liye m, do shehron ke beech ki doori ke liye km.

Badi unit ko chhoti mein badalne ke liye guna karo: 3 m = 3 × 100 = 300 cm. 4 cm 5 mm = 40 + 5 = 45 mm.

3 m = 300 cm · 4 cm 5 mm = 45 mm

Explore: sabse achhi unit chuno.

  1. Har ek ko sabse achhi unit mein sort karo.

Yaad rakho

  • Lambai ki SI unit metre (m) hai.
  • 1 km = 1000 m, 1 m = 100 cm, 1 cm = 10 mm.

Quick check

2 metre mein kitne centimetre hain?

  1. 200 cm
  2. 20 cm
  3. 2000 cm
  4. 100 cm
Answer

200 cm. 1 m = 100 cm, to 2 m = 200 cm.

Socho

Farhan ki rassi 2 m 35 cm lambi hai. Uski lambai centimetre aur millimetre mein likho.

Ek answer

2 m 35 cm = 200 + 35 = 235 cm. Millimetre mein: 235 × 10 = 2350 mm.

Practice

Teen levels (easy, medium, hard) ke naye sawaalon se practice karo, kuch hands-on, hints aur hal ke saath. Topic poora karne ke liye pichhle 5 mein se 4 sahi karo.