Heat (তাপ) Class 7 Part 1 Chapter 3 Questions & Answers
Assam State Education Board Syllabus 2025-2026 Covered
Heat is an important topic in science that helps us understand how energy is transferred and how different materials respond to temperature changes. In this post, we provide important questions and answers from NCERT & SCERT Assam Class 7 Science Chapter 3 - Heat (তাপ) as per the Assam State Education Board syllabus for 2025-2026.
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Join Our WhatsAppIntroduction to Heat (তাপ)
Heat is a form of energy that flows from a hotter object to a cooler one. It plays a crucial role in daily life, from cooking to industrial applications. This chapter explains different modes of heat transfer, temperature measurement, and the effects of heat on substances.
Class 7 Science Question Answer – Part I All Chapters
Below are the chapters of Class 7 Science. Click on the chapter name to access the respective question-and-answer content:
- Nutrition in Plants
- Nutrition in Animals
- Heat
- Motion and Time
- Acids, Bases and Salts
- Physical and Chemical Changes
- Weather, Climate and Adaptations of Animals to Climate
- Winds, Storms and Cyclones
- Soil
1. State similarities and differences between the laboratory thermometer and the clinical thermometer.
Ans:-
Similarities:-
(i) Both are made of glass and consist of a long narrow glass tube .
(ii) At one end both of them have a bulb .
(iii) Bulbs of both the thermometers consist of mercury .
(iv) Celsius scale is present in both the thermometers .
Differences
Clinical Thermometer
Temperature range is 35 0C to 420C
Used to measure human body temperature
It has kink which prevents immediate backflow of mercury
Laboratory thermometer
Temperature range is -10 0C to 110 0C
Used to measure temperature in the laboratory
It does not have a kink
2. Give two examples each of conductors and insulators of heat.
Ans:- Conductors: Iron and copper
Insulators: Plastic and wood
3. Fill in the blanks :
(a) The hotness of an object is determined by its __________.
(b) Temperature of boiling water cannot be measured by a _____________ thermometer.
(c) Temperature is measured in degree ______________.
(d) No medium is required for transfer of heat by the process of __________.
(e) A cold steel spoon is dipped in a cup of hot milk. Heat is transferred to its other end by the process of ______________.
(f ) Clothes of ______________ colours absorb heat better than clothes of light colours.
Ans:-
(a) The hotness of an object is determined by its temperature.
(b) Temperature of boiling water cannot be measured by a clinical thermometer.
(c) Temperature is measured in degree Celcius.
(d) No medium is required for transfer of heat by the process of radiation.
(e) A cold steel spoon is dipped in a cup of hot milk. Heat is transferred to its other end by the process of conduction.
(f ) Clothes of dark colours absorb heat better than clothes of light colours.
5. Discuss why wearing more layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing.
Ans:- More layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing because air gets trapped in between the layers. As air is a bad conductor of heat it does not allow the heat to escape from the body.
7. In places of hot climate it is advised that the outer walls of houses be painted white. Explain.
Ans:- In places of hot climate, it is advised that the outer walls of houses be painted white because white colour reflects back most of the heat that is incident on it, as white is a poor absorber of heat. This helps in keeping the house cool.
8. One litre of water at 30°C is mixed with one litre of water at 50°C. The temperature of the mixture will be
(a) 80°C
(b) more than 50°C but less than 80°C
(c) 20°C
(d) between 30°C and 50°C
Ans:- The temperature of the mixture will be between 30°C and 50°C because hot water loses heat and simultaneously cold water gains heat. This keeps the temperature in between 30°C and 50°C.
9. An iron ball at 40°C is dropped in a mug containing water at 40°C. The heat will
(a) flow from the iron ball to water.
(b) not flow from the iron ball to water or from water to the iron ball.
(c) flow from water to the iron ball.
(d) increase the temperature of both.
Ans:- (b) not flow from the iron ball to water or from water to the iron ball because both of them have the same temperature of 40°C.
10. A wooden spoon is dipped in a cup of ice cream. Its other end
(a) becomes cold by the process of conduction.
(b) becomes cold by the process of convection.
(c) becomes cold by the process of radiation.
(d) does not become cold.
Ans:- (d) does not become cold because wood is a bad conductor of heat.
11. Stainless steel pans are usually provided with copper bottoms. The reason for this could be that
(a) copper bottom makes the pan more durable.
(b) such pans appear colourful.
(c) copper is a better conductor of heat than stainless steel.
(d) copper is easier to clean than stainless steel.
Ans:- (c) copper is a better conductor of heat than stainless steel.
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Class 7 Science Chapter 3 - Important Questions & Answers
Q1: What is heat?
Answer: Heat is a form of energy that is transferred between objects due to a difference in temperature. It always flows from a hotter body to a cooler body.
Q2: How is heat different from temperature?
Answer: Heat is the total energy of molecular motion in a substance, whereas temperature measures the average kinetic energy of the molecules in an object.
Q3: What are the three modes of heat transfer?
Answer: The three modes of heat transfer are:
Conduction: Heat transfer through direct contact (e.g., heating a metal rod).
Convection: Heat transfer in fluids due to movement of particles (e.g., boiling water).
Radiation: Heat transfer without any medium (e.g., heat from the Sun).
Q4: What are conductors and insulators? Give examples.
Answer:
Conductors: Materials that allow heat to pass through them easily (e.g., metals like copper and aluminum).
Insulators: Materials that do not allow heat to pass through easily (e.g., wood, plastic, wool).
Q5: Why do we wear woolen clothes in winter?
Answer: Woolen clothes trap air, which acts as an insulator and prevents body heat from escaping, keeping us warm.
Q6: Why is water used as a coolant in car engines?
Answer: Water has a high specific heat capacity, which means it can absorb and retain a large amount of heat, making it effective for cooling engines.
Q7: How does a thermos flask prevent heat loss?
Answer: A thermos flask minimizes heat transfer using:
Vacuum layer: Prevents conduction and convection.
Silver coating: Reduces radiation.
Tight lid: Prevents heat exchange with surroundings.
FAQs on Heat (তাপ)
Q1: Why does metal feel colder than wood at the same temperature?
Answer: Metal is a good conductor of heat and quickly transfers heat away from our body, making it feel colder than wood, which is a poor conductor.
Q2: Can heat travel through a vacuum?
Answer: Yes, heat can travel through a vacuum by radiation, as seen in the heat from the Sun reaching Earth.
Q3: Why does land heat up faster than water?
Answer: Land has a lower specific heat capacity than water, so it absorbs and releases heat more quickly.
Q4: Why do black objects absorb more heat?
Answer: Black surfaces absorb all wavelengths of light and convert them into heat, making them warmer than lighter-colored surfaces.
Q5: What is the effect of heat on solids, liquids, and gases?
Answer:
Solids expand when heated (thermal expansion).
Liquids expand and take the shape of the container.
Gases expand and occupy more space when heated.
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