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Heat Class 7 Worksheet Science Chapter 3

Q.1. True/False
(i) Temperature of boiling water cannot be measured by a clinical thermometer.
(ii) Medium is required for transfer of heat by the process of radiation.
(iii) Clothes of dark colours absorb heat better than clothes of light colours.
(iv) Light coloured clothes are preferred during summer.
(v) We should hold the thermometer by the bulb while holding it.
(vi) The bulb of laboratory thermometer should not touch the bottom or the sides of the container.

Q.2. Fill in the blanks.
(i)  The hotness of an object is determined by its ____.
(ii) Temperature is measured in degree ____.
(iii) A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the process of ____.
(iv) Land breeze blows during ____.
(v) Sea breeze blows during ____.
(vi) Dark coloured clothes are preferred during ____.
(vii) Poor conductors are known as ____.

Q.3. What is the use of the kink in clinical thermometer?

Q.4. Does transfer of heat by radiation require any medium?

Q.5. Why can't a clinical thermometer be used to measure high temperatures? 

Q.6. What is the concern associated with the use of mercury thermometer?

Q.7. In places of hot climate it is advised that the outer walls of houses be painted white. Explain.

Q.8. How water gets heated when kept on flame?

Q.9. Why does the mercury not fall or rise in a clinical thermometer when taken out of the mouth?

Q.10. Explain land breeze.

Q.11. Explain the construction of clinical thermometer.

Q.12. Which device is used to measure temperature?

Q.13. What is the unit of temperature as adopted by India?

Q.14. What is the range of a laboratory thermometer?

Q.15. How does heat flow from one object to another?

Q.16. Do all hot bodies radiate heat?

Q.17. What do you mean by temperature?

Q.18. Will heat transfer if the temperature of two objects is the same?

Q.19. How does heat transfer in solids?

Q.20. What is Conduction?


You can find Worksheets Solutions here: Worksheet Solutions: Heat

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FAQs on Heat Class 7 Worksheet Science Chapter 3

1. What is heat?
Ans. Heat is a form of energy that is transferred from one object to another due to a difference in temperature. It can be produced by the movement of atoms and molecules within a substance.
2. How is heat transferred?
Ans. Heat can be transferred through three processes: conduction, convection, and radiation. In conduction, heat is transferred through direct contact between objects. In convection, heat is transferred through the movement of fluid (liquid or gas). In radiation, heat is transferred through electromagnetic waves.
3. What are the effects of heat on different materials?
Ans. The effects of heat on different materials can vary. Some materials expand when heated, while others contract. For example, metals usually expand when heated, which can lead to the bending or warping of structures. On the other hand, some materials, such as certain types of plastics, may melt or deform when exposed to high temperatures.
4. How does heat affect the states of matter?
Ans. Heat can cause changes in the states of matter. When a solid is heated, it can melt and become a liquid. Further heating can cause the liquid to evaporate and become a gas. Conversely, when a gas is cooled, it can condense and become a liquid, and further cooling can cause the liquid to solidify and become a solid.
5. What are some practical applications of heat?
Ans. Heat has various practical applications in our everyday lives. It is used for cooking, heating homes and buildings, generating electricity, and powering engines in vehicles. Heat is also crucial in industries such as manufacturing, where it is used for processes like metal casting and welding.
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