1. Rishav puts a stainless steel spoon in a glass of Hot Milk but Arnav does not do so. The milk of which glass will cool faster. Give reasons for your answer.
2. Why woollen clothes are better than cotton clothes in winter?
3. What would be the final temperature difference between two bodies after they have been in contact with each other for quite some time?
4. A man of mass 84 kg, maybe e regarded as having done a work of 8.4 kilojoule while climbing up stairs that take him to a height of 10m above the ground. Suppose the man I want to burn out 48 kcal by repeatedly climbing up the stairs. Neglecting the loss or gain of energy by him while climbing down, estimate the number of 'upward trips' that he needs to make.
5. Shyam's mother is fond of shining vessels, thought of replacing her cooking vessels with vessels that were shining bright on all sides.But Ashok's mother told her that she should not do so. She told her that shining metal caps are good for fire fighters but vessels, with shining bottoms are not good for cooking. What do you think? Give reasons for your answer.
6. Is it it true to say that liquids are not only expand on heating but they do so more than solids? Explain.
7. What happens to a hot body when put in air? Explain it in detail.
8. Why on a wintry day a metallic object appears colder than a wooden one?
9. Why should we not rely on our sense of touch for estimating the hotness of an object? Explain it on the basis of your Physics textbook.
10. How will you find the range of a clinical thermometer? Explain why a clinical thermometer cannot be used to measure high temperatures?
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