Courses

Courses for Kids

Free study material

Store

Talk to our experts

1800-120-456-456

CBSE

Class 7

Science Worksheets

Heat

Master the Heat Chapter: Class 7 Science CBSE Worksheets & Answers

Practice Key Heat Concepts: CBSE Class 7 Science 2025-26 Exam Prep

CBSE Class 7 Science Heat Worksheets with Answers for Chapter 4 in PDF format to download prepared by expert Science teachers from the latest edition of CBSE(NCERT) books. Register Online for NCERT Solutions Class 7 Science tuition on Vedantu to score more marks in CBSE board examination. Vedantu is a platform that provides free CBSE Solutions (NCERT) and other study materials for students. Maths Students who are looking for the better solutions, can download Class 7 Maths NCERT Solutions to help you to revise the complete syllabus and score more marks in your examinations.

Class 7th Science is said to be tougher than other junior classes because students will get introduced to various new yet complicated concepts and the chapter Heat is no exception. Let’s see what’s all covered in this chapter and how you can prepare well from worksheets.

The term “heat” is used to refer to energy that makes something hot. We experience cold in winter inside our houses and warmth outside when we are exposed to sun rays. Do we know how we feel this sensation of cold or heat? If yes, what would our answer be? You might get confused, right? This is why CBSE has presented this chapter in the class 7th Science NCERT textbooks.

The chapter begins by general introduction of hot and cold by explaining how we can feel both with our sense of touch. Following this, the chapter gives the general definitions like temperature, thermometer, and different types of thermometer like clinical laboratory and others. The chapter also gives detailed insight to students on how to read the thermometer.

Later part of the chapter talks about transfer of heat through conduction, convection and radiation. Explaining heat is transferred by conduction in solid, by convection in liquids and gases and by radiation in free space or vacuum. The chapter on heat concludes by defining the sea breeze and land breeze to the students. That has become the most important question that is asked in the final examinations and is explained in our worksheets thoroughly.

Important topics covered in CBSE Class 7 Science Heat Worksheets

The important topics that are covered in the Science worksheets of class 7 are:

Temperature Breeze
Conduction
Convection
Radiation
Clothes in different climatic conditions
Heat transfer

How to Prepare for Class 7 Heat Chapter?

One can easily prepare for the class 7 chapter “Heat” through the following ways:

Read the NCERT Class 7 Science textbook thoroughly. Become familiar with the concepts.
Prepare short notes for each topic. Notes will help you have a better understanding of each topic.
Concentrate more on high weightage topics like the difference between clinical and laboratory thermometers, conduction, land breeze & sea breeze.
Make sure to prepare for detailed diagrams of land breeze and sea breeze before the exam.
The chapter “Heat” is more about definitions, the difference between MCQ and match the following; prepare them well before the exam.

Advantages of using worksheets

The advantages of using worksheets are as follows:

Worksheets will help you to develop an understanding of the types of questions that might be asked in the exam and how you should approach them
Vedantu worksheets have various sets of questions from difficult topics like thermometers, conduction and radiation, this will help you prepare for each topic in a better way
With the help of worksheets, you can prepare well for MCQs, definitions and distinctions
Most of the easier or less weighted topics can be covered by using worksheets alone, saving you time

FAQs on Master the Heat Chapter: Class 7 Science CBSE Worksheets & Answers

1. What are the key differences between a clinical and a laboratory thermometer that make them suitable for their specific purposes?

The key differences between a clinical and a laboratory thermometer are based on their specific uses:

Temperature Range: A clinical thermometer measures a narrow range, typically from 35°C to 42°C, as it is only used for human body temperature. A laboratory thermometer has a much wider range, usually from -10°C to 110°C, to measure various substances in experiments.
Presence of a Kink: A clinical thermometer has a small bend or kink in the tube just above the bulb. This prevents the mercury from falling back down immediately, allowing time to take an accurate reading after removing it from the mouth. Laboratory thermometers do not have a kink.
Reading Method: The temperature on a clinical thermometer can be read after it is removed from the body. A laboratory thermometer must be kept in contact with the substance while the reading is being taken.
Handling: A clinical thermometer should be given a jerk to bring the mercury level down before use, whereas this is not required for a laboratory thermometer.

2. Explain the phenomenon of sea breeze and land breeze. Why are these important climatic features in coastal areas?

Sea breeze and land breeze are convection currents that occur in coastal regions due to the differential heating of land and water.

Sea Breeze:

During the day, the land heats up faster than the sea.
The air above the land becomes hot and rises, creating an area of low pressure.
The air above the cooler sea is at a higher pressure.
Cooler air from the sea moves towards the land to fill this low-pressure area. This movement of air from the sea to the land is called a sea breeze.

Land Breeze:

At night, the process reverses. The land cools down faster than the sea.
The air above the warmer sea rises, creating a low-pressure area.
The cooler air from the land, which is at a higher pressure, moves towards the sea. This is called a land breeze.

These breezes are important as they moderate the climate in coastal areas, preventing extreme temperatures during the day and night.

3. Why is it advised to wear dark-coloured clothes in winter and light-coloured clothes in summer? Explain the scientific reason.

The advice on clothing colour is based on the principles of heat absorption and reflection through radiation.

In Winter: Dark-coloured surfaces are good absorbers of heat radiation. When we wear dark clothes in winter, they absorb more heat from the sunlight, helping to keep our bodies warm.
In Summer: Light-coloured surfaces are poor absorbers and good reflectors of heat radiation. Wearing light-coloured clothes in summer reflects most of the sun's heat away from our bodies, helping us to stay cool and comfortable.

4. Explain the three modes of heat transfer—conduction, convection, and radiation—with one important real-life example for each.

Heat can travel from a hotter object to a colder object in three distinct ways:

Conduction: This is the transfer of heat through direct contact, primarily in solids, where heat moves from particle to particle without the actual movement of particles.
Example: A metal spoon getting hot when left in a cup of hot tea. The heat travels from the hot tea, through the spoon's body, to the handle.
Convection: This mode involves the transfer of heat through the movement of fluids (liquids or gases). Hotter, less dense fluid rises, and cooler, denser fluid sinks, creating a convection current.
Example: Boiling water in a pot. The water at the bottom gets heated, rises, and the cooler water from the top sinks to take its place.
Radiation: This is the transfer of heat through electromagnetic waves, which does not require any medium. Heat can travel through a vacuum, like space.
Example: Feeling the warmth of the sun on your face. The sun's heat travels millions of kilometres through the vacuum of space to reach us.

5. Why is mercury the preferred liquid in most thermometers over water? List at least three key reasons.

Mercury is preferred over water for use in thermometers for several important scientific reasons:

Freezing and Boiling Points: Mercury has a very high boiling point (357°C) and a low freezing point (-39°C), allowing it to measure a wide range of temperatures. Water freezes at 0°C and boils at 100°C, making it unsuitable for measuring temperatures outside this narrow range.
Uniform Expansion: Mercury expands and contracts uniformly and predictably with changes in temperature, which ensures an accurate and consistent temperature scale.
Visibility and Adhesion: Mercury is a shiny, opaque liquid, making it easy to see inside the narrow glass tube of a thermometer. Unlike water, it does not stick to the sides of the glass, ensuring a precise reading.

6. A stainless steel cooking pan is often provided with a copper bottom and a plastic handle. Why is this an effective design for cooking?

This design is highly effective because it uses the principles of heat conduction to its advantage:

Copper Bottom: Copper is an excellent conductor of heat. Having a copper bottom allows the pan to heat up quickly and distribute the heat evenly across its surface. This ensures that the food is cooked uniformly without hot spots.
Plastic Handle: Plastic is a poor conductor of heat, also known as an insulator. The plastic handle prevents the heat from the hot pan from travelling to the user's hand via conduction. This makes the pan safe to hold and move while cooking, preventing burns.

7. What are the essential precautions a student must take while reading a laboratory thermometer during a science experiment?

To get an accurate measurement in an experiment for the CBSE Class 7 syllabus for 2025-26, the following precautions are essential:

The thermometer should be held vertically and not tilted.
The bulb of the thermometer should be completely surrounded by the substance whose temperature is being measured.
The bulb should not touch the bottom or the sides of the container.
The temperature reading must be taken while the bulb is still in contact with the substance.
Your eye must be at the same level as the mercury level to avoid parallax error in the reading.