Question

natural ventilation
11. 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 hear
energy? Why do other modes of transmission of heat not play a significant rol
13. 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 transference
15. What do you understand by the terms (a) lower standard point (h) upper standar
16. 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 clinica
19. Give two examples of (a) insulators (b) conductors,
Value Based Questions:
rior took her temperature with the clinical them
full Then she asked the qe​

Answer 1

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