MEDIUM
7th CBSE
IMPORTANT
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Which of the thermometers, A or B, will show a greater rise in temperature? Give reason for your answer.

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Important Questions on Heat

MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 4 - Heat>Exercise 4.1>Q III
To keep her soup warm Paheli wrapped the container in which it was kept with a woollen cloth. Can she apply the same method to keep a glass of cold drink to cool? Give reason for your answer.
MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 4 - Heat>Exercise 4.1>Q III
In a mercury thermometer, the level of mercury rises when its bulb comes in contact with a hot object. What is the reason for this rise in the level of mercury?
MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 4 - Heat>Exercise 4.1>Q IV
With the help of an activity, show the thermal expansion in gases.
MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 4 - Heat>Exercise 4.1>Q IV
Why are gaps left between two sections of the rail tracks?
HARD
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 4 - Heat>Exercise 4.1>Q IV
Explain thermal expansion in solids with the help of an example.
MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 4 - Heat>Exercise 4.1>Q IV
Explain why a clinical thermometer cannot be used to measure high temperature?
MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 4 - Heat>Exercise 4.1>Q IV
Explain the anomalous behaviour of water by giving examples.
MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 4 - Heat>Exercise 4.1>Q IV
Why do electric wires sag in summers?