Heat Class 7 Extra Questions and Answers Science Chapter 4 PDF are solved by experts and will guide students in the right direction. Students can get how to tackle different questions easily by solving the Extra Questions for Class 7 Science Question bank on a regular basis.
Class 7 Science Chapter 4 Extra Questions and Answers Heat
Extra Questions for Class 7 Science Chapter 4 Heat with Answers
Heat Class 7 Extra Questions Very Short Answer Type
Question 1.
What is a clinical thermometer?
Answer:
The thermometer that is used to measure human body temperature is called a clinical thermometer.
Question 2.
How is degree Celsius denoted?
Answer:
°C.
Question 3.
What is the range of a clinical thermometer?
Answer:
35°C to 42°C.
Question 4.
What is the normal temperature of human body?
Answer:
The normal temperature of human body is 37°C.
Question 5.
Which gets hotter soon, land or water?
Answer:
Land.
Heat Class 7 Extra Questions Short Answer Type 1
Question 1.
Why is range of a clinical thermo¬meter is chosen to be 35°C to 42°C?
Answer:
The clinical thermometer is designed to measure the temperature of human body only. The temperature of human body normally does not go below 35°C or above 42 GC. That is why, the clinical thermometer has the range 35°C to 42°C.
Question 2.
What caution do you suggest regarding a clinical thermometer?
Answer:
A clinical thermometer should not be be used for measuring the temperature of any object other than the human body. Also avoid keeping the thermometer in the sun or near a flame. It may break.
Question 3.
Why should you wear white clothes in summer and black clothes in winter?
Answer:
Dark surfaces absorb more heat and, therefore, w’e feel comfortable with dark -coloured clothes in the winter. Light coloured clothes reflect most of the heat that falls on them and, therefore, we feel more comfortable wearing them in the summer.
Heat Class 7 Extra Questions Short Answer Type 2
Question 1.
Describe the construction of a clinical thermometer.
Answer:
A clinical thermometer consists of a long, narrow, uniform glass tube. It has a bulb at one end. This bulb contains mercury. Outside the bulb, a small shining thread of mercury can be seen. There is also a Celsius scale on the thermometer.
Heat Class 7 Extra Questions Long Answer Type
Question 1.
How do land and sea breezes blow?
Answer:
During the day, the land gets heated faster than the water. The air over the land becomes hotter and rises up. The cooler air from the sea rushes in towards the land to take its place. The air forms the sea breeze. The warm air from the land moves towards the sea to complete the cycle.
At nigh it is exactly the reverse. The water cools down more slowly than the land. So, the cool air from the land moves towards the sea. This forms the land breeze.
Question 2.
Show the formation of land and sea breezes with the help of diagrams.
Answer:
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