Question

Q 1. Define

1) temperature

2) Convection

3) conduction

4) radiation



Q2. give reason why

a) we use Mercury in thermometer and not water

b) Utensils are provided with handles made of plastic or wood

c) Wearing many layers of clothes during winters give more warmth than wearing just one piece of cloth



Q3. How does the heat from the sun reaches Earth?Explain.



Q4. We prefer to wear light coloured clothes in summer. Explain



Q5. Why does Convection not take place in solids?



Q6. differentiate between

a) conductor and insulator

b) clinical thermometer and laboratory thermometer



Q7. slabs of ice are covered with sawdust or gunny bags to prevent them from melting. Why?



Q8. Explain sea breeze and land breeze with the help of diagram.

Answer 1

Temperature is a physical quantity expressing hot and cold. 

Answer 2

Answer:

This thermoforming technique begins with extruded or rolled plastic sheets of the desired thickness that are fed into a pre-heating machine. ... While in place the plastic is cooled until it reaches the desired rigidity. The final cover is ejected with reverse air flow before being trimmed or otherwise finished.