Chemical Effects of Electric Current Class 8 Science MCQs

The topic Chemical Effects of Electric Current is an important part of the CBSE Class 8 Syllabus. It explains how electric current can cause chemical changes in various substances. Understanding this topic not only helps students with their academics but also develops their interest in real-life applications of science, such as electroplating, purification of metals, and battery functioning.

For better understanding and preparation, students can explore resources like chemical effects of electric current class 8 notes and NCERT Solutions for Class 8 Science. These materials simplify the concepts and make them easier to revise. To test your knowledge, attempting chemical effects of electric current class 8 MCQ online test and practicing class 8 chemical effects of electric current questions and answers is highly recommended.

This topic covers key concepts like how electric current flows through liquids, the role of electrodes, and the formation of gases or deposits during electrolysis. Teachers often include chemical effects of electric current class 8 extra questions in exams to evaluate students’ understanding.

For students looking to practice and prepare thoroughly, resources like chemical effects of electric current class 8 MCQ, quizzes, and study guides can be very helpful. These tools not only help you assess your knowledge but also familiarize you with the question patterns you might encounter in tests.

To master this chapter, start with the basics outlined in your NCERT Class 8 textbook, then use extra resources to deepen your understanding. Focus on the important processes and applications discussed in this chapter, as they form the foundation of many practical and industrial uses of electricity.

MCQ for Class 8 Science Chemical Effects of Electric Current

MCQ for Class 8 Science Chemical Effects of Electric Current helps students understand key concepts like electrolysis and conductors. These questions align with the CBSE Class 8 Science Syllabus, making learning fun and effective. Practice these MCQs to improve problem-solving skills and score better in exams while mastering the topic.

Chemical Effects of Electric Current class 8 MCQs with Answer

Ques: What is an electrolyte?

A. A conductor of electricity in solid state

B. A non-conductor of electricity in liquid state

C. A substance that conducts electricity in liquid state by ionization

D. None of the above

Ans: C

Explanation: Electrolytes are substances that conduct electricity in a liquid state by producing ions. Examples include acids, bases, and salts.

Ques: Which of the following liquids is the best conductor of electricity?

A. Distilled water

B. Saltwater

C. Oil

D. Alcohol

Ans: B

Explanation: Saltwater contains ions that help in conducting electricity, while distilled water, oil, and alcohol do not conduct electricity effectively.

Ques: What happens when electric current passes through water?

A. Water gets heated

B. Hydrogen and oxygen gases are formed

C. Water freezes

D. Water evaporates

Ans: B

Explanation: When electric current passes through water, electrolysis occurs, breaking water into hydrogen and oxygen gases.

Ques: Which material is used for the electrode in electroplating?

A. Copper

B. Silver

C. Gold

D. Any of the above

Ans: D

Explanation: Electrodes can be made of copper, silver, or gold, depending on the metal to be electroplated.

Ques: Which process is used to purify impure metals?

A. Sedimentation

B. Decantation

C. Electrolysis

D. Filtration

Ans: C

Explanation: Electrolysis is used for purifying metals by passing electric current through a solution containing the metal.

Ques: What type of change occurs during the electrolysis of water?

A. Physical change

B. Chemical change

C. Both physical and chemical changes

D. No change

Ans: B

Explanation: Electrolysis of water causes a chemical change as water breaks down into hydrogen and oxygen.

Ques: Which instrument is used to detect the passage of electricity through a liquid?

A. Ammeter

B. Voltmeter

C. Galvanometer

D. Electroscope

Ans: C

Explanation: A galvanometer detects small electric currents and can be used to determine if electricity passes through a liquid.

Ques: What is the process of depositing a layer of metal on another material using electricity called?

A. Electrolysis

B. Electroplating

C. Galvanization

D. Magnetization

Ans: B

Explanation: Electroplating is the process of depositing a thin layer of one metal on another using electricity.

Ques: Which of the following is NOT an example of an electrolyte?

A. Vinegar

B. Lemon juice

C. Distilled water

D. Saltwater

Ans: C

Explanation: Distilled water does not contain ions and cannot conduct electricity unless impurities or salts are added.

Ques: What happens to the ions in an electrolyte when electricity passes through it?

A. They evaporate

B. They combine

C. They move to electrodes

D. They freeze

Ans: C

Explanation: Positive ions move towards the cathode, and negative ions move towards the anode when electricity passes through an electrolyte.

Ques: Which gas is released at the cathode during electrolysis of water?

A. Oxygen

B. Hydrogen

C. Chlorine

D. Nitrogen

Ans: B

Explanation: Hydrogen gas is released at the cathode during the electrolysis of water.

Ques: Electroplating is used to:

A. Make objects rust-proof

B. Make objects attractive

C. Both A and B

D. None of the above

Ans: C

Explanation: Electroplating is used for rust prevention and enhancing the appearance of objects.

Ques: Why is distilled water a poor conductor of electricity?

A. It lacks free ions

B. It is highly acidic

C. It is a solid

D. It contains no oxygen

Ans: A

Explanation: Distilled water lacks dissolved salts or ions needed for conducting electricity.

Ques: What is the main application of the chemical effects of electric current?

A. Heating of liquids

B. Electroplating

C. Rusting

D. Magnetization

Ans: B

Explanation: Electroplating is one of the main applications of the chemical effects of electric current.

Ques: Which of the following is used as an electrolyte in batteries?

A. Distilled water

B. Lemon juice

C. Sulphuric acid

D. Glycerine

Ans: C

Explanation: Sulphuric acid is commonly used as an electrolyte in batteries due to its ability to produce ions.

Ques: Which effect of electric current is used in the purification of copper?

A. Magnetic effect

B. Chemical effect

C. Heating effect

D. None of the above

Ans: B

Explanation: The chemical effect of electric current is used in purifying copper through electrolysis.

Ques: Which electrode gains mass during electroplating?

A. Anode

B. Cathode

C. Both

D. None

Ans: B

Explanation: During electroplating, the cathode gains mass as the metal is deposited on it.

Ques: What is formed at the anode during electrolysis of water?

A. Hydrogen gas

B. Oxygen gas

C. Chlorine gas

D. Nitrogen gas

Ans: B

Explanation: Oxygen gas is released at the anode during the electrolysis of water.

Ques: Why is electroplating used in industries?

A. To prevent rust

B. To make objects attractive

C. To reduce wear and tear

D. All of the above

Ans: D

Explanation: Electroplating is widely used to prevent rust, enhance appearance, and increase durability.

Ques: Which of the following liquids is a poor conductor of electricity?

A. Tap water

B. Saltwater

C. Sugar solution

D. Vinegar

Ans: C

Explanation: Sugar solutions do not produce ions and thus cannot conduct electricity effectively.

Ques: The electrolyte in a lemon battery is:

A. Water

B. Citric acid

C. Glucose

D. Sodium chloride

Ans: B

Explanation: Citric acid in lemon acts as the electrolyte in a lemon battery.

Ques: Which metal is commonly electroplated on iron to prevent rusting?

A. Copper

B. Zinc

C. Gold

D. Silver

Ans: B

Explanation: Zinc is electroplated on iron to prevent rusting, a process known as galvanization.

Ques: What happens when electricity passes through a solution?

A. Gases may form

B. Deposits may form

C. Solution may change color

D. All of the above

Ans: D

Explanation: Depending on the solution, various changes such as gas formation, deposits, and color changes can occur.

Ques: What property of a solution determines its ability to conduct electricity?

A. Color

B. Amount of dissolved ions

C. Temperature

D. Pressure

Ans: B

Explanation: Solutions conduct electricity based on the presence and concentration of ions.

Ques: What is the main function of electrodes in electrolysis?

A. To generate ions

B. To conduct electricity into the solution

C. To evaporate the solution

D. To change the solution’s color

Ans: B

Explanation: Electrodes allow electricity to enter or leave the solution, enabling electrolysis.

MCQs on Chemical Effects of Electric Current Class 8 Science FAQs

What are the chemical effects of electric current?

The chemical effects of electric current class 8 refer to the changes that occur in a substance when an electric current passes through it. These effects include gas formation, deposition of metals, and changes in the color of the solution. For more practice, explore chemical effects of electric current class 8 MCQ online test and related quizzes.

Why is electrolysis important in the study of chemical effects of electric current?

Electrolysis demonstrates the chemical effects of electric current by breaking down substances into their components. It helps explain how electricity causes chemical changes, such as gas release or metal deposition, which are key topics in class 8 chemical effects of electric current questions and answers.

How can I prepare for exams on chemical effects of electric current?

You can prepare using chemical effects of electric current class 8 notes, practicing chemical effects of electric current class 8 MCQ, and solving chemical effects of electric current class 8 extra questions. These resources provide in-depth understanding and exam-oriented practice.

What role do electrodes play in the chemical effects of electric current?

Electrodes conduct electricity into a solution during electrolysis, leading to chemical changes. Questions about electrodes often appear in chemical effects of electric current class 8 MCQ online test, so practicing such questions can be beneficial.

Where can I find reliable study material for the chemical effects of electric current?

You can refer to chemical effects of electric current class 8 notes, NCERT textbooks, and sample papers. Solving class 8 chemical effects of electric current questions and answers will also enhance your preparation for exams.