Avsaadan, Nithaarna aur Filtration
Class 6 Science · Chapter 9: Rozmarra mein Alag Karne ke Tareeke · NCERT Curiosity section Ch 9
Seekho
Tez baarish ke baad Farhan ke gaon ka nal ka paani gandla hai. Uski maa baalti bharkar kuch ghante shaant rakhti hain. Bhaari mitti dheere-dheere neeche baith jaati hai: sedimentation (avsaadan).
Phir wo upar ka saaf paani dheere se doosre bartan mein daalti hain, mitti ko hilaaye bina: decantation (nithaarna). Kuch baareek kan ab bhi tair sakte hain.
Unhe hataane ke liye wo paani ko moda saaf kapda ya filter paper se daalti hain. Chhote kan filter par reh jaate hain; saaf paani tapakta hai: filtration. Peene laayak banaane ke liye phir paani ubaalna ya shuddh karna chahiye taaki germs marein.
Explore: gandla paani saaf karo.
- Steps kram mein lagao.
Yaad rakho
- Sedimentation: bhaari na ghulne wale kan baithte hain. Decantation: upar ka drav alag daalo.
- Filtration filter se baareek kan hataata hai; surakshit banaane ke liye paani ubaalo.
Quick check
Thos ke baithne ke baad saaf drav ko alag daalna kehlata hai …
- decantation
- sedimentation
- evaporation
- churning
Answer
decantation. Baithna sedimentation hai; nithaarna decantation.
Socho
Kya filtration namkeen paani se namak hata deta hai? Kyun nahi?
Ek answer
Nahi. Namak ghula hua hai, to uske chhote kan paani ke saath filter se nikal jaate hain. Filtration sirf na ghulne wale kan hataata hai.
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.