Struggling to understand the basics of heat in class 7? With this comprehensive worksheet, you'll find all the answers and explanations you need to get a deeper level of knowledge in no time. Find out how you can ace your learning journey on the topic!

Define the Different Forms of Heat.

Heat comes in a variety of forms, and it's important to understand them all. Heat can be transferred through radiative, conductive and convective methods. Radiative heat transfer is done through the emission of electromagnetic waves from one body to the other. Conductive heat transfer takes place when two objects that are at different temperatures come into contact. Finally, convective heat transfer is the exchange of thermal energy between two fluids moving past each other at different temperatures.

Explain Conduction and Its Characteristics.

Conduction is the heat transfer process which occurs through direct contact between two objects. Heat energy is transferred from the higher temperature object to the colder, lower temperature object. It is also dependent on three main characteristics: material properties, medium of transmission and temperature difference between two bodies. For example, metals are good conductors of heat as they have a high thermal conductivity and can easily transmit heat energy through direct contact with other materials, while non-metals like glass and air offer poor utility in this regard.

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Heat class 7 Extra Questions and Answers

1. What is heat? Answer: Heat is a form of energy that is transferred from one body to another as a result of the difference in temperature between them.

2. What is temperature? Answer: Temperature is a measure of the degree of hotness or coldness of an object. It is measured in degrees Celsius (°C) or Fahrenheit (°F).

3. How is heat transferred? Answer: Heat can be transferred by conduction, convection, and radiation.

4. Define conduction. Answer: Conduction is the transfer of heat through a material from a higher temperature region to a lower temperature region by the transfer of kinetic energy between particles in contact.

5. Define convection. Answer: Convection is the transfer of heat by the movement of a fluid, such as air or water, due to differences in temperature and density.

6. Define radiation. Answer: Radiation is the transfer of heat through electromagnetic waves without the need for a medium.

7. What is a thermometer? Answer: A thermometer is an instrument used for measuring temperature. It consists of a glass tube containing a liquid, usually mercury or alcohol, that expands or contracts as the temperature changes.

8. What is the unit of measurement for temperature? Answer: The unit of measurement for temperature is degrees Celsius (°C) or Fahrenheit (°F).

9. What is the difference between heat and temperature? Answer: Heat is a form of energy while temperature is a measure of the degree of hotness or coldness of an object.

10. What are the effects of heat? Answer: Heat can cause substances to expand, change their state, or undergo chemical reactions. It can also cause physical changes such as melting or evaporation.

11. What is specific heat capacity? Answer: Specific heat capacity is the amount of heat energy required to raise the temperature of one unit mass of a substance by one degree Celsius.

12. What are the three states of matter? Answer: The three states of matter are solid, liquid, and gas.

13. What is latent heat? Answer: Latent heat is the amount of heat energy required to change the state of a substance without changing its temperature.

14. What is the boiling point of water? Answer: The boiling point of water is 100°C or 212°F.

15. What is the melting point of ice? Answer: The melting point of ice is 0°C or 32°F.

    
    

    FAQ

    
    

    1. What are the types of thermometer for class 7?

    There are different types of thermometers for class 7, such as clinical thermometers, laboratory thermometers, digital thermometers, and infrared thermometers.

    2. What is laboratory thermometer for class 7?

    A laboratory thermometer is a type of thermometer used to measure temperature in a laboratory setting. It is usually longer than a clinical thermometer and can measure temperature from -10°C to 110°C.

    3. What are the types of thermometers in physics?

    The types of thermometers in physics include mercury thermometer, alcohol thermometer, gas thermometer, bimetallic thermometer, and thermocouple.

    4. Why is mercury used in thermometer for class 7?

    Mercury is used in thermometer for class 7 because it has a low freezing point (-38.83°C) and a high boiling point (356.73°C), making it suitable for measuring temperatures between -38°C to 357°C.

    5. What is thermometer class 7?

    A thermometer is a device used to measure temperature. It consists of a bulb containing a liquid, usually mercury or alcohol, and a glass tube with a calibrated scale.

    6. Why is mercury used in thermometer class 7?

    Mercury is used in thermometer class 7 because it is a good conductor of heat, has a uniform expansion rate, and can easily be seen through the glass tube.

    7. What is the liquid metal used in thermometer?

    The liquid metal used in thermometer is usually mercury, but other metals such as gallium and indium can also be used.

    8. What are the types of thermometers?

    The types of thermometers include mercury thermometer, alcohol thermometer, digital thermometer, bimetallic thermometer, gas thermometer, and thermocouple.

    9. What are the types of thermometers in physics?

    The types of thermometers in physics include mercury thermometer, alcohol thermometer, gas thermometer, bimetallic thermometer, and thermocouple.

    10. What are the types of thermometer in physics?

    The types of thermometer in physics include mercury thermometer, alcohol thermometer, gas thermometer, bimetallic thermometer, and thermocouple.

    11. What is laboratory thermometer class 7?

    A laboratory thermometer class 7 is a type of thermometer used in a laboratory setting to measure temperature. It usually has a temperature range from -10°C to 110°C.

    12. Which one is filled in the bulb of thermometer?

    The bulb of a thermometer is usually filled with a liquid, such as mercury or alcohol.

    13. What is the range of alcohol thermometer?

    The range of an alcohol thermometer is typically from -115°C to 78°C.

    14. What are the thermometer parts name?

    The main parts of a thermometer include the bulb, stem, and the calibrated scale. Some thermometers may also have a capillary tube, a thermistor, or a digital display.

    15. What are the two types of thermometers?

    The two types of thermometers are contact thermometers, which require physical contact with the object being measured, and non-contact thermometers, which use infrared technology to measure temperature without physical contact.

    16. What are the types of thermometers and their uses?

    The types of thermometers and their uses include clinical thermometer (for measuring body temperature), laboratory thermometer (for measuring temperature in a laboratory setting), digital thermometer (for quick and accurate temperature readings), and infrared thermometer (for non-contact temperature measurement).

    17. Which liquid metal is used for making thermometer?

    Mercury is the liquid metal commonly used for making thermometers, due to its unique properties and wide temperature range.

    18. What is the range of alcohol thermometer?

    The range of an alcohol thermometer is typically from -115°C to 78°C.

    19. Why is mercury used in making thermometer?

    Mercury is used in making thermometers because it has some unique properties that make it an ideal choice for use in thermometers. Mercury has a very high coefficient of thermal expansion, which means that it expands and contracts rapidly with changes in temperature. This property allows it to rise and fall quickly in a thermometer, making it easy to read the temperature accurately.

    Mercury also has a low freezing point (-38.8°C) and a high boiling point (356.7°C), making it suitable for use in both low-temperature and high-temperature applications. Additionally, it is a good conductor of heat, which allows it to quickly transfer heat from the object being measured to the thermometer bulb.