Class 8 Science Chapter 11 MCQ (Multiple Choice Questions) of Chemical Effects of Electric Current updated for new academic session 2024-25. These multiple choice objective quiz will help the students in the preparation of school tests and terminal exams. Prepare the entire chapter 11 of class 8 science using these objective questions with answers. All the questions are important as well as useful for a student of standard 8. These questions are prepared from the class 8 science chapter 11 NCERT Textbook only.

Class 8 Science Chapter 11 MCQ

Class: 8Science
Chapter: 11Chemical Effects of Electric Current
Contents: MCQ Online Tests with Explanation
Session:2024-25

MCQ Tests with Answers for Class 8 Science Chapter 11

Q1

In an activity to check the conduction of electricity through two liquids labelled A and B by using a bulb, it is observed that the bulb glows brightly for liquid B while it glows very dimly for liquid A.

[A]. Liquid A is a better conductor than liquid B
[B]. Liquid B is a better conductor than liquid A
[C]. Both liquids are equally conducting
[D]. Conducting properties of liquids cannot be compared in this manner
Q2

Consider the following statements and choose the incorrect one:

[A]. Layer of zinc is coated over iron because zinc prevents it from rust and corrosion.
[B]. The solution of sugar in distilled water is a poor conductor of electricity.
[C]. Heating effect of electric current is responsible for the bulb to glow in an electric circuit.
[D]. None of the above
Q3

Boojho and Paheli performed experiment taking similar bulbs and cells but two different solution A and B respectively. They found that the bulb in the set-up A glows more brightly as compared to that of the set of B. You would conclude that:

[A]. Higher current is flowing through the circuit in setup A.
[B]. Higher current is flowing through the circuit in setup B.
[C]. Equal current is flowing through both the circuits.
[D]. The current flowing through the circuits in the two setups cannot be compared in this manner.
Q4

Which of the following does not conduct electricity?

[A]. Vinegar solution
[B]. Sugar solution
[C]. Lemon juice solution
[D]. Caustic soda solution
Q5

In a science quiz competition, Payel is asked a question where she had to choose the statement which was/were correct?

[A]. A strong electrolyte is a liquid or solution which conducts electricity very well.
[B]. A weak electrolyte is a liquid or solution which conducts electricity to a lesser extent.
[C]. A solid electrical conductor through which an electric current enters or leaves something like a dry cell, is called an electrode.
[D]. All the above
Q6

Recently, in a science class test, you are asked a question where you have to say whether the statements are correct or not?

[A]. The positively charged electrode is called anode.
[B]. The negatively charged electrode is called cathode.
[C]. An arrangement having two electrodes kept in a conducting liquid in a vessel is called an electrolytic cell.
[D]. All the above
Q7

Which of the following metals are produced by the electrolysis of their molten compounds?

[A]. Copper and Silver
[B]. Silver and Aluminium
[C]. Aluminium and Sodium
[D]. Sodium
Q8

Read the following sentences carefully, and choose the incorrect one:

[A]. When an electric current is passed through hydrochloric acid solution the bulb glows brightly.
[B]. When an electric current is passed through vinegar or lemon juice then the bulb glows very dimly.
[C]. We can use light emitting diode in a place of a torch bulb for detecting weak electric current passing through a liquid.
[D]. None of the above
Q9

Payal is completed her science chapter where she wrote some statements. She wants to know whether the statements are correct or not? Payal wants to take help from you:

[A]. If the current flowing through the circuit is too weak, then the heating effect produced by current in a filament is too little.
[B]. Distilled water becomes a good conductor of electricity on dissolving a little of salt in it.
[C]. If a weak electric current flow through the liquid in the circuit, the magnetic needle of compass will show deflection.
[D]. None of the above
Q10

Badal appeared in class test but he confused to know the correct statement. Would you help him to know that?

[A]. Due to the presence of small amount of acids, rain water becomes a conductor of electricity.
[B]. Sea water is a much better conductor of electricity than drinking water.
[C]. We should never operate an electric switch or touch any working electrical appliances with wet hands.
[D]. All the above
Q11

Which of the following compounds is manufactured by using the chemical effect of electric current?

[A]. Ammonium hydroxide
[B]. Sodium carbonate
[C]. Magnesium hydroxide
[D]. Sodium hydroxide
Q12

Recently, in a science class test, you are asked a question where you have to say whether the statements are correct or not?

[A]. We can dissolve some salt in distilled water or pure water to make it a good conductor of electricity.
[B]. We can add a little of acid in distilled water or pure water to make it a good conductor of electricity.
[C]. We can add a little of a base in distilled water of pure water to make it a good conductor of electricity.
[D]. All the above
Q13

Which one of the following solutions will not conduct electricity?

[A]. Lemon juice
[B]. Vinegar
[C]. Tap water
[D]. Vegetable oil
Q14

Consider the following statements and choose the incorrect one:

[A]. Tap water is a good conductor of electricity.
[B]. Rain water is a good conductor of electricity.
[C]. Distilled water is a good conductor of electricity.
[D]. None of the above
Q15

In the last year examination of class VIII, Rahul were asked a question where he had to choose the statement which was/were incorrect? Will you be able to answer this question?

[A]. The process of depositing a thin layer of a desired metal over a metal object with the help of electric current is called electroplating.
[B]. The chemical effect produced by an electric current depends on the nature of conducting solution and nature of electrodes.
[C]. The fresh fruits and vegetables conduct electricity to some extent due to the presence of various salt solution in them.
[D]. None of the above
Q16

Electrolytes conduct electricity due to the movement of:

[A]. Electrodes
[B]. Atoms
[C]. Electrons
[D]. Ions
Q17

The chemical reaction brought about by an electric current may produce one or more effects. Choose the correct statements:

[A]. Bubbles of a gas may be formed on the electrodes.
[B]. Deposits of metals may form on electrodes.
[C]. Changes in colour of solution may occur
[D]. All the above
Q18

Non-metals are generally non-conductors of electricity. The non-metal whose one of the forms can be used to make electrodes in electrolysis experiments is:

[A]. [A] Iodine
[B]. Carbon
[C]. Silicon
[D]. Phosphorus
Q19

In the purification of an impure metal by using the chemical effect of electric current or electrolysis, we should not take:

[A]. A thick rod of impure metal is made positive electrode.
[B]. A thin strip of pure metal is made negative electrode.
[C]. A water-soluble salt of the metal to be purified is taken as electrolyte.
[D]. A distilled water salt of the metal to be purified is taken as electrolyte.
Q20

Which of the following is not an application of the chemical effect of electric current?

[A]. Electroplating of metals
[B]. Purification of metals
[C]. Decomposition of elements
[D]. Decomposition of compounds
Q21

Which of the following effects is not produced by the chemical reactions of brought about by an electric current?

[A]. Bubbles of gases on electrodes
[B]. Deposits of metals on electrode
[C]. Change in color of solution
[D]. Formation of a precipitate
Q22

Which of the following can be electroplated with chromium?

[A]. Bakelite and Graphite
[B]. Graphite and Steel
[C]. Steel
[D]. Graphite and Teflon
Q23

In order to obtain a coating of silver metal on a flower vase made of copper, the electrolyte has to be:

[A]. Silver nitrate solution
[B]. Copper nitrate solution
[C]. Sodium nitrate solution
[D]. Copper sulphate solution
Q24

Chemical effect of electric current is used in industries or factories for the different purposes. Choose the correct purposes:

[A]. Electroplating metals and purification of metals
[B]. Production of certain metals from the ores
[C]. Production of chemical compounds and decomposing chemical compounds
[D]. All the above
Q25

If plus sign (+) denotes the positive electrode and minus sign (-) denotes the negative electrode, then which of the following statement is correct for an iron spoon to be copper plated?

[A]. Iron spoon (+), copper plate (-), Iron sulphate electrolyte
[B]. Iron spoon (-), copper plate (+), Iron sulphate electrolyte
[C]. Copper plate (-), Iron spoon (+), Copper sulphate electrolyte
[D]. Copper plate (+), Iron spoon (-), Copper sulphate electrolyte

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Last Edited: June 12, 2023