Chhaanna (Sieving)
Class 6 Science · Chapter 9: Rozmarra mein Alag Karne ke Tareeke · NCERT Curiosity section Ch 9
Seekho
Roti banaane se pehle Ira ke papa aata chhalni se chhaante hain. Baareek aata chhote chhedon se nikal jaata hai; chokar aur chhoti gaanthein upar reh jaati hain. Ye sieving hai: alag size ke kanon ko alag karna.
Nirmaan ki jagah par mazdoor ret ko badi tirchhi jaali par phenkte hain taaki kankad-pattharon se alag ho. Kya rakhna hai uske hisaab se bade ya chhote chhedon wali chhalni chuni jaati hai.
Chai ki chhalni bhi chhoti sieve hai: drav chai nikal jaati hai, pattiyaan reh jaati hain.
Explore: kaunsa tareeka?
- Har mishran ko sabse achhe tareeke se sort karo.
Yaad rakho
- Sieving chhalni se alag size ke kan alag karta hai.
- Kya rakhna hai uske hisaab se chhed ka size chuno.
Quick check
Sieving kis mein alag kanon ko alag karta hai?
- size (aakaar)
- rang
- gandh
- swaad
Answer
size (aakaar). Chhote kan chhedon se nikal jaate hain; bade reh jaate hain.
Socho
Kya namak aur cheeni ko chhaanakar alag kar sakte ho? Kyun ya kyun nahi?
Ek answer
Aam taur par nahi: namak aur cheeni ke daane lagbhag ek size ke hain, to dono ek hi chhalni se nikal jaate hain. Sieving tabhi kaam karta hai jab kanon ka size saaf alag ho.
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.