Natural ventilation11. Why do people prefer to wear(a) dull clothes in

1.	Natural ventilation11. Why do people prefer to wear(a) dull clothes in winter, and(b) white clothes in summer?12. While sitting around burning wood, by which mode of transmission of hearenergy? Why do other modes of transmission of heat not play a significant rol13. Which of the following containing same amount of boiling hor water is likely to(a) A beaker whose surface is covered with aluminium foil,(b) A beaker whose surface is painted black.14. How does radiation differ from conduction and convection for the transference15. What do you understand by the terms (a) lower standard point (h) upper standar16. Why do birds puff up their feathers in the winter?17. Why do the people wear dark or black clothes in the winter?18. State the similarities and differences between a laboratory thermometer and a clinica19. Give two examples of (a) insulators (b) conductors,Value Based Questions:rior took her temperature with the clinical themfull Then she asked the qe
Answer» Answer: 11 a becaz dull colours ABSORB more heat and REFLECT less b and white clothes absorb less heat and reflect more heat 12 it happens of radiation because it does not REQUIRE any vaccum and by not others as the need vaccum 13 aluminium foil 14 radiation donot need vaccum and can say direct transfer 15 from 1to 4 degree Celsius its UPPER st point and the MELTING and boiling point is as lower st point 16 to keep themselves warmth 17 to keep themselves warmth as black clothes absorb more heat and reflect less heat 19 insulators. wood plastic conductors copper man

Natural ventilation11. Why do people prefer to wear(a) dull clothes in winter, and(b) white clothes in summer?12. While sitting around burning wood, by which mode of transmission of hearenergy? Why do other modes of transmission of heat not play a significant rol13. Which of the following containing same amount of boiling hor water is likely to(a) A beaker whose surface is covered with aluminium foil,(b) A beaker whose surface is painted black.14. How does radiation differ from conduction and convection for the transference15. What do you understand by the terms (a) lower standard point (h) upper standar16. Why do birds puff up their feathers in the winter?17. Why do the people wear dark or black clothes in the winter?18. State the similarities and differences between a laboratory thermometer and a clinica19. Give two examples of (a) insulators (b) conductors,Value Based Questions:rior took her temperature with the clinical themfull Then she asked the qe

Answer»

Answer:

11 a becaz dull colours ABSORB more heat and REFLECT less

b and white clothes absorb less heat and reflect more heat

12 it happens of radiation because it does not REQUIRE any vaccum and by not others as the need vaccum

13 aluminium foil

14 radiation donot need vaccum and can say direct transfer

15 from 1to 4 degree Celsius its UPPER st point and the MELTING and boiling point is as lower st point

16 to keep themselves warmth

17 to keep themselves warmth as black clothes absorb more heat and reflect less heat

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