Daily Practice Problems
Class 7 Science
Physical and Chemical Changes
daily practice problem

Question 1.

Any alteration of a substance from its original shape, size and state is known as a _______.

 

Question 2.

Give some examples of reversible changes and irreversible changes.

 

Question 3.

One should eat freshly cut apple. Why?

 

Question 4.

What is a physical change? Give some examples of physical changes. Also, state why they are physical changes.

 

Question 5.

What kind of change is cloud formation?

 

Question 6.

What is a chemical change?

 

Question 7.

What is rust? What is rusting of iron?

 

Question 8.

Explain rusting of copper.

 

Question 9.

Why silver articles get tarnished?

 

Question 10.

Give two ways to prevent rusting of iron?

 

Question 11.

What are physical properties?

 

Question 12.

In _______ change no new substance is formed.

 

Question 13.

Which one of the following is a chemical change?

(a) Twinkling of stars

(b) Cooking of vegetables

(c) Cutting of fruits

(d) Boiling of water

 

Question 14.

Write the chemical equation for burning of magnesium ribbon.

 

Question 15.

Write the chemical equation for formation of magnesium hydroxide by mixing magnesium with water.

 

Question 16.

Dissolve about a teaspoonful of copper sulphate (blue vitriol or neela thotha) in about half a cup of water in a glass tumbler or a beaker. Add a few drops of dilute sulphuric acid to the solution. You should get a blue coloured solution.

When you add an iron nail, the colour of the solution turns green. What do you think might be the reason?

a. Formation of iron sulphate

b. Reaction between iron and sulphuric acid changes the colour of the solution.

c. Reaction between iron and copper sulphate changes the colour of the solution.

d. Both a and c.

 

Question 17.

When iron is dipped in a copper sulphate solution, iron displaces the copper from its solution and forms iron sulphate. In addition, a brown layer can be seen on the iron nail. what is it?

a. Rust

b. Copper

c. Either a or b

d. Neither a nor b

 

Question 18.

Passing carbon-dioxide through lime water produces _________.

a. CaCO3

b. [Ca(OH)2]

c. CaO

d. None of them

 

Question 19.

What are the characteristics of chemical changes?

 

Question 20.

State whether the given sentence is true or false.

For rusting, the presence of both oxygen and water (or water vapour) is essential.

**********

Problem-solving on Class 7 Science Physical and Chemical Changes NCERT Chapter 6 after learning a theoretical concept is crucial for several reasons:

  1. Application of Knowledge: Problem-solving allows you to apply the theoretical concepts of the topic Class 7 Science Physical and Chemical Changes you have learned to real-life situations. It helps you bridge the gap between abstract knowledge and practical scenarios, making the learning more relevant and meaningful.
  2. Understanding Deeper Concepts: When you encounter problems related to a theoretical concept that you learned in Class 7 Science Physical and Chemical Changes NCERT Chapter 6, you are forced to delve deeper into its intricacies. This deeper understanding enhances your comprehension of the subject and strengthens your grasp of the underlying principles.
  3. Critical Thinking: Problem-solving encourages critical thinking and analytical skills. It requires you to analyze the problem, identify relevant information, and devise a logical solution. This process sharpens your mind and improves your ability to approach complex challenges effectively.
  4. Retention and Recall: Actively engaging in problem-solving reinforces your memory and improves long-term retention. Applying the concepts learned in Physical and Chemical Changes Class 7 Science in practical scenarios helps you remember them better than passive reading or memorization.
  5. Identifying Knowledge Gaps: When you attempt to solve problems, you may encounter areas where your understanding is lacking. These knowledge gaps become evident during problem-solving, and you can then focus on filling those gaps through further study and practice. You can refer Physical and Chemical Changes Class 7 Science Notes on LearnoHub.com
  6. Boosting Confidence: Successfully solving problems after learning a theoretical concept boosts your confidence in your abilities to handle Physical and Chemical Changes. This confidence motivates you to tackle more challenging tasks and improves your overall performance in the subject.
  7. Preparation for Exams and Challenges: Many exams, especially in science, mathematics, and engineering, involve problem-solving tasks. Regular practice in problem-solving prepares you to face these exams with confidence and perform well. It is also advised to take tests on Physical and Chemical Changes Class 7 Science Online Tests at LearnoHub.com.
  8. Enhancing Creativity: Problem-solving often requires thinking outside the box and exploring various approaches. This fosters creativity and innovation, enabling you to come up with novel solutions to different problems.
  9. Life Skills Development: Problem-solving is a valuable life skill that extends beyond academics. It equips you with the ability to tackle various challenges you may encounter in personal and professional life.
  10. Improving Decision Making: Problem-solving involves making decisions based on available information and logical reasoning. Practicing problem-solving enhances your decision-making skills, making you more effective in making informed choices.

In summary, problem-solving after learning a theoretical concept on CBSE Physical and Chemical Changes Class 7 Science is an essential part of the learning process. It enhances your understanding, critical thinking abilities, and retention of knowledge. Moreover, it equips you with valuable skills that are applicable in academic, personal, and professional contexts.

You must have heard of the phrase “Practice makes a man perfect”. Well, not just a man, practice indeed enhances perfection of every individual.

Practicing questions plays a pivotal role in achieving excellence in exams. Just as the adage goes, "Practice makes perfect," dedicating time to solve a diverse range of exam-related questions yields manifold benefits. Firstly, practicing questions allows students to familiarize themselves with the exam format and types of problems they might encounter. This familiarity instills confidence, reducing anxiety and improving performance on the actual exam day. Secondly, continuous practice sharpens problem-solving skills and enhances critical thinking, enabling students to approach complex problems with clarity and efficiency. Thirdly, it aids in identifying weak areas, allowing students to focus their efforts on improving specific topics. Moreover, practice aids in memory retention, as active engagement with the material reinforces learning. Regular practice also hones time management skills, ensuring that students can allocate appropriate time to each question during the exam. Overall, practicing questions not only boosts exam performance but also instills a deeper understanding of the subject matter, fostering a holistic and effective learning experience.

All About Daily Practice Problems on Class 7 Science Physical and Chemical Changes NCERT Chapter 6

Our Daily Practice Problems (DPPs) offer a diverse range of question types, including Multiple Choice Questions (MCQs) as well as short and long answer types. These questions are categorized into Easy, Moderate, and Difficult levels, allowing students to gradually progress and challenge themselves accordingly. Additionally, comprehensive solutions are provided for each question, available for download in PDF format - Download pdf solutions as well as Download pdf Questions. This approach fosters a holistic learning experience, catering to different learning styles, promoting self-assessment, and improving problem-solving skills. With our well-structured DPPs, students can excel in exams while gaining a deeper understanding of the subject matter. Hope you found the content on Class 7 Science Physical and Chemical Changes NCERT Chapter 6 useful.

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