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Class 7 Science Chapter 3 Question Answers - Heat

Q1: State similarities and differences between the laboratory and clinicalthermometer.

Ans: Similarities:
1. Both consist of a long, narrow, uniform glass tube.
2. Both have a bulb containing mercury at the end of the tube.
3. Both are marked with Celsius scale on the glass tube.
Differences:
1. A clinical thermometer reads temperature from 350C to 420C, while a laboratory thermometer ranges between –100C to 1100C.
2. Clinical thermometer has a kink near the bulb while there is no kink in laboratory thermometer.

Q2: Give two examples each of conductors and insulators of heat.

Ans: Conductors of heat: copper, iron.
Insulators: wood, paper, plastic.

Conductors and InsulatorsConductors and Insulators

Q3:Fill in the blanks:

  1. The hotness of an object is determined by its _____________.
  2. Temperature of boiling water can not be measured by a _________thermometer.
  3. Temperature is measured in degree ___________.
  4. No medium is required for transfer of heat by the process of _______.
  5. A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the process of _________.
  6. Clothes of __________ colours absorb heat better than clothes of light colours.

Ans: (a) temperature, (b) Celsius, (c) conduction, (d) clinical, (e) radiation, (f) dark

Q4: Match the items in column I with those in column II:

Column I
Column II
  1. Land breeze blows during
  2. Sea breeze blows during
  3. Dark coloured clothes are preferred during
  4. Light coloured clothes are preferred during
  1. Summer
  2. Winter
  3. Day
  4. Night

Ans: 1-d, 2-c, 3-b, 4-a.

Q5: Discuss why wearing more layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing.

Ans: Wearing more layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing because of the air trapped between two layers of clothes. This layer prevents the flow of the heat from our body to the cold surroundings and keeps our body relatively warmer.

Q6: In places of hot climate it is advised that outer walls of houses be painted white. Explain.

Ans: It is because the white colour reflects most of the heat that falls on it. Hence, the outer walls of the houses in the places of hot climate are advised to paint with white colour so that most of the heat falling on these walls would be reflected which will help in keeping the houses cool.

Q7: One liter of water at 300C is mixed with one liter of water at 500C. The temperature of the mixture will be:

  1. 800C
  2. more than 500C but less than 800C
  3. 200C
  4. between 300C and 500C

Ans: d

Q8: An iron ball at 400C is dropped in a mug containing water at 400C. The heat will

  1. flow from iron ball to water
  2. not flow from iron ball to water or from water to iron ball
  3. flow from water to iron ball
  4. increase the temperature of both.

Ans: b

Q9: A wooden spoon is dipped in a cup of ice cream. Its other end

  1. becomes cold by the process of conduction.
  2. becomes cold by the process convection.
  3. becomes cold by the process of radiation.
  4. does not become cold.

Ans: d

Q10: Stainless steel pans are usually provided with copper bottoms. The reason for this could be that

  1. copper bottom makes the pan more durable.
  2. such pans appear colourful.
  3. copper is better conductor of heat than the stainless steel
  4. copper is easier to clean than the stainless steel

Ans: c

The document Class 7 Science Chapter 3 Question Answers - Heat is a part of the Class 7 Course Short & Long Answer Questions for Class 7.
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FAQs on Class 7 Science Chapter 3 Question Answers - Heat

1. What is heat and how is it related to temperature?
Ans. Heat is a form of energy that is transferred between two objects or systems due to a temperature difference. It flows from a hotter object to a cooler one. Temperature, on the other hand, is a measure of the average kinetic energy of the particles in a substance. The hotter the object, the higher its temperature, and the more heat it can transfer.
2. How is heat transferred between objects?
Ans. Heat can be transferred through three main processes: conduction, convection, and radiation. Conduction occurs when heat is transferred through direct contact between two objects. Convection involves the transfer of heat through the movement of fluids or gases. Radiation is the transfer of heat through electromagnetic waves, such as from the Sun to the Earth.
3. What are the effects of heat on different materials?
Ans. The effects of heat on materials vary depending on their properties. For example, metals are good conductors of heat and tend to expand when heated. Non-metals, on the other hand, may not conduct heat as well and may exhibit different behaviors when heated, such as melting or burning. Heat can also cause changes in states of matter, such as the transition from solid to liquid or from liquid to gas.
4. How is heat measured?
Ans. Heat is measured using a unit called the calorie or joule. The calorie is defined as the amount of heat required to raise the temperature of one gram of water by one degree Celsius. The joule is the more commonly used unit and is defined as the amount of work done when a force of one newton moves an object one meter against a force of one newton.
5. How can heat be controlled or manipulated?
Ans. Heat can be controlled or manipulated through various means. Insulation can be used to reduce heat transfer by minimizing conduction or convection. Cooling systems, such as air conditioning or refrigeration, can be used to remove heat from an area. Heating systems, such as furnaces or heaters, can be used to provide heat to a space. Heat can also be converted into other forms of energy, such as electricity, through processes like thermoelectric conversion.
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