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Chapter 1: The Ever-Evolving World of Science
This chapter introduces students to the nature and scope of science, showing how it influences our everyday lives. It encourages curiosity and builds a basic understanding of scientific inquiry.
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Chapter 2: Exploring Substances: Acidic, Basic, and Neutral
Students learn about different types of substances—acids, bases, and neutrals—and how to identify them using indicators. The concept of neutralization is explained through real-life applications.
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Chapter 3: Electricity: Circuits and Their Components
This chapter explains how electric circuits work and introduces basic electrical components and their symbols. It also discusses conductors and insulators through engaging hands-on activities.
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Chapter 4: The World of Metals and Non-metals
Learners explore the properties of metals and non-metals, how they react with the environment, and the effects of corrosion. It helps them distinguish between different materials based on their characteristics.
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Chapter 5: Changes Around Us: Physical and Chemical
The focus is on understanding different types of changes, including physical and chemical transformations. Real-life examples help explain how such changes occur in daily life and nature.
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Chapter 6: Adolescence: A Stage of Growth and Change
This chapter discusses the physical and emotional changes during adolescence, including puberty and menstruation. It also promotes awareness of myths and emphasizes healthy growth.
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Chapter 7: Heat Transfer in Nature
Students are introduced to the methods of heat transfer—conduction, convection, and radiation. The chapter links these processes to natural phenomena like the water cycle and groundwater seepage. These CBSE Class 7 Science – Chapter Wise Study Materials Based on NCERT explain Heat Transfer in Nature through conduction, convection, and radiation. Students learn how these processes relate to natural phenomena such as the water cycle and groundwater movement. All study materials are prepared strictly as per the NCERT syllabus, making them ideal for CBSE Class 7 exam preparation.
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Chapter 8: Measurement of Time and Motion
Basic concepts of motion and time measurement are covered. Students understand how to calculate speed and relate it to time, laying the groundwork for physics in higher classes. This CBSE Class 7 Science – Chapter Wise Study Materials Based on NCERT post explains the fundamentals of measurement of time and motion. Students learn how speed, distance, and time are related, helping them build strong conceptual grounding for higher-level physics. These study materials follow the NCERT syllabus strictly, making them ideal for CBSE Class 7 board-exam preparation.
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Chapter 9: Life Processes in Animals
The chapter focuses on nutrition and digestion in humans and animals. It also introduces respiration and the mechanism of breathing, emphasizing their importance in sustaining life.
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Chapter 10: Life Processes in Plants
Students learn how plants grow, prepare food via photosynthesis, and transport nutrients and water. The chapter highlights key life functions in plants like respiration and nutrient movement.
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Chapter 11: Light: Shadows and Reflections
The behavior of light and its interaction with objects is explored through shadows, reflections, and optical devices like mirrors and periscopes. The chapter encourages observation-based learning. This CBSE Class 7 Science – Chapter 11: Light: Shadows and Reflections study material provides clear, NCERT-aligned explanations of how light behaves, how shadows form, and how reflections occur in mirrors and simple optical devices. Designed strictly as per the NCERT syllabus, these resources ensure strong concept clarity and are ideal for CBSE Class 7 Board exam preparation.
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Chapter 12: Earth, Moon, and the Sun
This chapter explains the movements of the Earth and their effects, such as day - night and seasons. It also introduces celestial phenomena like solar and lunar eclipses.
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Exploring Substances: Acidic, Basic, and Neutral – MCQs Online Practice Test with Automatic scoring

CBSE Class 7 Science – Chapter 2: Exploring Substances: Acidic, Basic, and Neutral – Online MCQ Quiz (30 Questions)

CBSE Class 7 Science – Chapter Wise Study Materials (NCERT Based)

Class: 7

Subject: Science

Chapter: 2 – Exploring Substances: Acidic, Basic, and Neutral

CBSE Board Examinations – Online MCQ Quiz (30 Questions)

This interactive quiz for Class 7 Science – Chapter 2: Exploring Substances: Acidic, Basic, and Neutral contains 30 topic-wise Multiple Choice Questions with automatic scoring and instant feedback. All questions are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 7 exam practice.

30 questions · 30 minutes · Auto-submission on time over
Per-question feedback with correct answer and explanation
Final score display with “Submit Quiz & Show Answers” button

Read each question carefully and click the correct option. You can attempt questions in any order. As soon as you select an option, you will get instant feedback below that question.

Instructions: Click Start Quiz to begin the 30-minute countdown. Use Submit Quiz & Show Answers to see your total score and ensure every question’s answer and explanation are visible. Use Reset Quiz to start again.

Topic 1: Basic Concepts – Acids, Bases and Neutral Substances

Q1. Which of the following is most likely to be an acid?

Soap solution

Lemon juice

Baking soda solution

Chalk powder in water

Q2. Which statement about bases is correct?

They always taste sweet.

They turn blue litmus red.

They feel soapy and turn red litmus blue.

They have no effect on litmus.

Q3. Which of the following is a neutral substance?

Vinegar

Pure water

Soap solution

Lemon juice

Q4. Which property is common to all acids?

They taste bitter.

They feel slippery.

They change red litmus to blue.

They change blue litmus to red.

Q5. Which of the following pairs is correctly matched?

Lemon – base

Soap – acid

Curd – acid

Baking soda – acid

Q6. Which substance is most likely to be a base used at home?

Vinegar

Sugar solution

Baking soda

Orange juice

Q7. Why should we never taste laboratory acids and bases?

They do not have any taste.

They may be corrosive and harmful.

They always taste sweet.

They change colour on tasting.

Topic 2: Indicators – Litmus, Turmeric and China Rose

Q8. From which natural source is litmus obtained?

Turmeric plant

China rose petals

Lichens

Neem leaves

Q9. Blue litmus paper turns red in which type of solution?

Basic solution

Acidic solution

Neutral solution

Any solution

Q10. Turmeric indicator turns reddish-brown when:

Acid is added

Base is added

Neutral solution is added

Only water is added

Q11. China rose (hibiscus) indicator usually turns:

Red in acids and green in bases

Green in acids and red in bases

Yellow in both acids and bases

Colourless in acids and bases

Q12. A solution does not change the colour of either red or blue litmus. This solution is:

Strongly acidic

Strongly basic

Neutral

Corrosive

Q13. Which is the safest way to identify an unknown solution?

Taste it carefully.

Smell it deeply.

Check its temperature.

Use suitable indicators like litmus.

Topic 3: Neutralisation – Reaction Between Acids and Bases

Q14. Neutralisation is a reaction between:

Two acids

Two bases

An acid and a base

A salt and water

Q15. The main products formed in a neutralisation reaction are:

Acid and metal

Base and hydrogen gas

Salt and water

Only gas

Q16. Which of the following is an example of neutralisation in daily life?

Melting of ice

Boiling of water

Using antacid for acidity

Evaporation of water

Q17. Acidic soil in fields is treated with:

More acid

Lime (quicklime or slaked lime)

Sugar solution

Salt solution

Q18. Bee sting injects an acidic liquid into the skin. Which is the best first-aid?

Apply lemon juice

Apply vinegar

Apply baking soda paste

Apply more acid

Q19. Wasp sting is basic in nature. It is best treated with:

Baking soda solution

Vinegar or lemon juice

Soap solution

More alkali

Topic 4: Acid Rain and Environmental Impact

Q20. Acid rain is caused when rainwater mixes mainly with:

Oxygen and nitrogen

Sulphur dioxide and nitrogen oxides

Hydrogen and helium

Carbon monoxide and methane

Q21. Which of the following is NOT an effect of acid rain?

Damage to leaves and crops

Increase in fish population

Corrosion of buildings and monuments

Acidification of lakes and ponds

Q22. Acid rain makes lake water harmful to aquatic life because it:

Increases pH too much

Decreases pH too much

Removes all salts

Makes water colourless

Q23. How can we reduce the problem of acid rain?

By increasing number of vehicles

By burning more coal

By reducing air pollution from factories and vehicles

By cutting more trees

Topic 5: Simple Idea of pH and Body Fluids

Q24. A solution with pH 7 is:

Acidic

Basic

Neutral

Highly corrosive

Q25. A solution has pH 3. It is:

Strongly acidic

Weakly acidic

Neutral

Strongly basic

Q26. Antacids are useful because they:

Increase acidity in the stomach

Neutralise extra acid in the stomach

Produce more gas

Stop digestion completely

Topic 6: Uses and Safety of Acids and Bases

Q27. Which acid is present in our stomach to help digestion?

Acetic acid

Citric acid

Hydrochloric acid

Carbonic acid

Q28. Which base is used in whitewashing walls?

Sodium hydroxide

Calcium hydroxide

Magnesium hydroxide

Ammonium hydroxide

Q29. Toothpaste is usually made:

Strongly acidic

Strongly basic

Slightly basic

Completely neutral

Q30. Which of the following is a correct safety rule in the laboratory?

Taste chemicals to identify them.

Add water to acid while diluting.

Add acid slowly to water while diluting.

Carry acid bottles with one hand.

Exploring Substances: Acidic, Basic, and Neutral – MCQs with Answers and Explanations

Exploring Substances: Acidic, Basic, and Neutral – Numerical Problems with Stepwise Solutions

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Exploring Substances: Acidic, Basic, and Neutral – MCQs Online Practice Test with Automatic scoring

CBSE Board Examinations – Online MCQ Quiz (30 Questions)

Topic 1: Basic Concepts – Acids, Bases and Neutral Substances

Topic 2: Indicators – Litmus, Turmeric and China Rose

Topic 3: Neutralisation – Reaction Between Acids and Bases

Topic 4: Acid Rain and Environmental Impact

Topic 5: Simple Idea of pH and Body Fluids

Topic 6: Uses and Safety of Acids and Bases

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