PUMPA - SMART LEARNING

எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

Book Free Demo
1. Shopkeepers selling ice blocks usually cover them with jute sacks. Explain why.
 
Shopkeepers selling ice blocks usually cover them with jute sacks because materials like jute sacks, sawdust and newspapers acts as  and  escape or entry of heat through them.
 
2. To keep her soup warm Paheli wrapped the container in which it was kept with a woollen cloth. Can she apply the same method to keep a glass of cold drink cool? Give reason for your answer.
 
, Paheli  a woollen cloth to wrap around a glass cold drink to keep it cool because wool is a  of heat and  the heat transfer from the inner atmosphere to the outer atmosphere.