CBSE Class 7 Science Revision Worksheet Set 17

Chapter 7 : Weather, Climate and Adaptations of animals to climate :

Fill in the blanks :

1. ______________ is the measure of moisture in air.

2. The weather reports are prepared by the ___________ department of the government.

3. The day today condition of the atmosphere is a place is called ____________ at that place.

4. The maximum temperature of the day occurs in the ___________ while minimum temperature occurs in the ______________.

5. Polar regions are situated near ___________ and tropical region is situated around the _______________.

6. Special features of an animal to live in its surrounding is called _______________

7. Penguins are good swimmer because their bodies are___________ and their feet have __________________.

8. All the changes in the weather are driven by the ______________

9. One of the important feature of tropical region is __________

10. The ___________ regions are very cold throughout the year.

11. The temperature, humidity, rainfall and other factors are called _____________________ of the weather.

12. The typical desert climate is ___________ and _____________.

13. The climate of the north-east of India is __________________

14. _____________ is a means which is adapted by some birds to escape the harsh, cold conditions.

Name the following

1. An instrument used to measure rainfall.

2. The thermometer used to record maximum and minimum temperature.

3. Two animals living in polar regions.

Topic : Flow of Heat

Very Short Question/Answers-

Question 1 By which mode is heat transferred in solids?
Answer : In solids, heat is transferred through the process of conduction. This is because the molecules in solids are rigid and only vibrate on heating rather than moving from one place to the other. The vibrating molecules of the hotter region hit those molecules in the colder region, causing the transfer of heat.

Question 2: Are most metals good or bad conductors of heat?
Answer : Most metals are good conductors of heat. This is because the molecules in metals vibrate and hit the nearby molecules to transfer the heat energy, rather than moving from one place to the other.

Question 3: Gases are insulators of heat. True of false?
Answer : True Gases are insulators of heat because their molecules are loosely bonded; hence, they do not conduct heat.

Question 4: By which mode is heat transferred in liquids?
Answer : Heat transfer in liquids takes place through the process of convection. In this case, the molecules of liquids move from one place to other to transfer the heat energy.

Question 5: Name a liquid which is a good conductor of heat.
Answer : Mercury is a liquid which is a good conductor of heat. It is an exception, as all liquids are good insulator of heat.

Question 6: When you heat water in a pan, by which mode does most of the heat travel in water-conduction, convection or radiation?
Answer : When we heat water in a pan, the heat travels throughout the water through the process of convection.

Question 7: In which mode of transfer of heat does the medium not get heated up?
Answer : Radiation is a process in which the molecules don't transfer or carry heat from the hotter to colder regions, but the material itself radiates the heat energy. Therefore, it requires no medium to transfer the heat. Higher the temperature of the body, the more it radiates heat.

Question 8: A thermos flask consists of a double-walled glass vessel with the space between them filled with air, which is a bad conductor of heat. True of flase?
Answer : False. In a thermos flask, the space between the two glass walls is empty. This vacuum prevents heat loss through conduction and convection, as there is no medium present to transfer the heat by these two processes.

Question 9: Radiant heat falling on a body is partly absorbed and partly __________. Some of it may also be__________
Answer : Radiant heat falling on a body is partly absorbed and partly reflected. Some of it may also get transmitted.

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