Important Questions for Class 7 Science Chapter 3:
For CBSE Class 7 Science, Chapter 3 focuses on Heat. Important questions from this chapter generally explore fundamental concepts related to heat, temperature, and their effects. Students might be asked to explain how heat is transferred in everyday scenarios, such as boiling water or touching a metal spoon in a hot cup of tea.
Questions often include practical applications of these concepts, such as understanding how insulators and conductors work, the concept of thermal expansion, and the differences between solid, liquid, and gas regarding heat absorption and transmission. Mastery of these topics is crucial for understanding the basic principles of thermodynamics.
Important Questions for Class 7 Science Chapter 3 Overview
Important Questions for Class 7 Science, Chapter 3 Heat are crucial for reinforcing the fundamental concepts of thermodynamics that are covered in this chapter. These questions focus on topics such as the differences between heat and temperature, methods of heat transfer (conduction, convection, and radiation), the properties of materials influencing heat absorption and conduction, and practical applications of these concepts in everyday life.
Understanding these questions helps students develop a deeper comprehension of how heat affects various materials and phenomena around us. Preparing for these questions ensures that students are well-prepared for exams and builds a strong foundation in science for future learning.
Important Questions for Class 7 Science Chapter 3 PDF
Important Questions for Class 7 Science Chapter 3 Heat are essential for students preparing for their exams as they cover key concepts and topics from the chapter.
To help in effective exam preparation, a PDF containing these important questions is available for download. The link to access this PDF is provided below, making it convenient for students to utilize these valuable resources for their studies.
Important Questions for Class 7 Science Chapter 3 PDF
Important Questions for Class 7 Science Chapter 3 Heat
Here are the important questions beneficial for Important Questions for Class 7 Science Chapter 3 Heat-
Very Short Answer Questions:
Q1: Hotness of an object is measured using ___________.
Ans:
The hotness of an object is measured using a thermometer.
Q2: ____________ is the reliable measure of hotness.
Ans:
Temperature is a reliable measure of hotness.
Q3: The thermometer shown in the figure is ______________.
Ans:
The thermometer shown in the figure is clinical.
Explanation:
Clinical thermometers are used to measure the temperature of the human body.
Q4: Thermometer shown in the diagram is _______________.
Ans:
The thermometer shown in the diagram is laboratory.
Explanation:
Laboratory thermometers are used in schools or other scientific settings to measure temperature for experiments and demonstrations.
Q5: The red colour shows ____________ temperature and the blue colour shows_________ temperature.
Ans:
The red color shows maximum temperature and the blue color shows minimum temperature.
Explanation:
The red color represents the highest temperature reached, while the blue color indicates the lowest temperature recorded.
Q6: India has adopted the _______ scale for temperature measurement.
Ans:
India has adopted the Celsius scale for temperature measurement.
Q7: The scale used to measure temperature earlier was the _________________ scale.
Ans:
The scale used to measure temperature earlier was the Fahrenheit scale.
Q8: The normal body temperature of the human body is _______.
Ans:
The normal body temperature of the human body is 37°C.
Explanation:
This is the average normal body temperature for a healthy person.
Q9: The _____________ in the clinical thermometer prevents the mercury from falling on its own.
Ans:
The kink in the clinical thermometer prevents the mercury from falling on its own.
Explanation:
The kink prevents the mercury column from falling back immediately after being removed from the body, thus retaining the maximum temperature reading.
Q10: The human body temperature does not rise above ______________.
Ans:
The human body temperature does not rise above 42°C.
Explanation:
The human body has a physiological limit to its temperature to maintain homeostasis and prevent damage.
Short Answer Questions:
Q1: What is conduction?
Ans:
Conduction is the direct movement of heat from one point of an object to another by direct contact. Heat is transferred between materials that are in direct touch with one another. When a heated object comes into contact with another object, it transfers its heat directly, and this process continues as long as the objects remain in contact. It is the most common mode of heat transfer in solids and between solid materials.
Q2: What is convection?
Ans:
Convection is a heat transport method that occurs in liquids and gases. In this process, the fluid is heated unevenly. As the fluid heats up, it expands, becomes less dense, and rises, creating convection currents. Colder, denser fluid from other areas moves in to take the place of the rising hot fluid, and the process continues until the entire fluid is heated. Convection currents are responsible for natural phenomena like winds and storms.
Q3: What is radiation?
Ans:
Radiation is the transfer of heat between objects that are not in direct contact. Heat is emitted from a heated object into the surrounding environment as infrared radiation. This heat transfer occurs across empty space without the need for a medium. A hot object cools down as it radiates heat to the surroundings, allowing energy to be transferred from one object to another at a distance.
Q4: What are insulators?
Ans:
Insulators are materials that conduct heat poorly. They inhibit the flow of heat through them, making them ideal for use in applications where maintaining temperature is important. For example, handles for cooking utensils are often made from insulators like plastic, wood, or rubber to prevent heat transfer from the utensil to the handle.
Q5: What are conductors?
Ans:
Conductors are materials that readily allow the passage of heat. These materials enable efficient transfer of heat from one area to another. Common examples of conductors include metals like aluminum, iron, and copper, which are used in cooking utensils to ensure fast and even heat distribution during cooking.
Long Answer Questions:
Q1: What is a sea breeze?
Ans:
A sea breeze is a local wind system that flows from the sea to the land during the day. This phenomenon occurs along coastlines where there are significant temperature differences between the land and the sea.
During the day, the land heats up faster than the sea. As the land becomes warmer, the air above it expands and rises, creating a low-pressure zone. In response, cooler air from the sea moves towards the land to fill this low-pressure area, creating a breeze known as a sea breeze. This cool air moving from the sea to the land helps to regulate temperatures, making coastal areas cooler during the day. Sea breezes are particularly common in coastal areas and are a natural way for the environment to balance temperature differences.
Q2: What is a land breeze?
Ans:
A land breeze is the breeze that blows from the land towards the sea at night. This phenomenon occurs when the land cools down faster than the sea after sunset. The land loses its heat quickly, causing the air above it to cool and sink, creating a high-pressure zone. Simultaneously, the warmer air over the sea remains less dense and stays elevated.
The cool air from the land moves out towards the sea to replace the rising warmer air, forming a land breeze. This process is a reverse of the sea breeze and occurs mainly at night when the difference in temperatures between the land and the sea is at its peak. Land breezes are a natural nighttime cooling mechanism for coastal areas, helping to regulate temperatures during the night.
Q3: How does wearing woolen clothes keep us warm in winters?
Ans:
Woollen clothing is particularly effective in keeping us warm during winter due to its unique properties. Wool fibers have a natural crimp that traps air between them, creating numerous tiny air pockets. Air is a poor conductor of heat, and these air pockets act as excellent insulators, helping to retain body heat. Wool fibers also absorb moisture, preventing sweat from dampening the fabric and losing warmth.
The insulating properties of wool reduce the transfer of body heat to the environment, keeping us warm. The multiple layers created by woolen clothing also trap more air, providing better insulation and comfort in colder conditions. As a result, wearing woolen clothes in winter helps to maintain body warmth by trapping heat and reducing heat loss to the surroundings.
Benefits of Solving Important Questions for Class 7 Science Chapter 3
Solving important questions for Class 7 Science Chapter 3 - Heat offers several benefits for students:
Reinforces Key Concepts
: By practicing important questions, students reinforce their understanding of the core concepts related to heat, such as conduction, convection, radiation, and the properties of insulators and conductors. These questions often cover topics that are fundamental to the chapter, helping students grasp the underlying principles more effectively.
Enhances Critical Thinking
: Many important questions require students to apply their knowledge in different scenarios, thereby enhancing their critical thinking and analytical skills. For instance, they might be asked to explain a real-life phenomenon using scientific concepts, which encourages deeper understanding and helps in the retention of information.
Improves Time Management
: Working through important questions allows students to manage their time better. They learn how to allocate appropriate time to different questions and practice solving problems within a limited timeframe, which is a valuable skill for timed exams.
Builds Strong Foundation
: Regular practice with important questions helps build a strong foundation in Science. This foundational knowledge is crucial for understanding more complex topics in future grades, making it easier for students to tackle advanced concepts.
Identifies Weak Areas
: By attempting important questions, students can identify areas where they are weak or need more practice. This self-assessment helps them focus on the topics they need to study further, ensuring a more thorough preparation for their exams.
