Class 8 Science Chapter 14 MCQ (Multiple Choice Questions) of Chemical Effects of Electric Current updated for new academic session 2023-2024. These multiple choice objective quiz will help the students in the preparation of school tests and terminal exams. Prepare the entire chapter 14 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 14 NCERT Textbook only.

Class 8 Science Chapter 14 MCQ for 2023-2024

Class: 8Science
Chapter: 14Chemical Effects of Electric Current
Contents: MCQ Online Tests with Explanation

MCQ Tests with Answers for Class 8 Science Chapter 14

Q1

An electric current can produce:

[A]. Heating effect
[B]. Chemical effect
[C]. Magnetic effect
[D]. Chemical, heating, and magnetic effects.
Q2

Which of the following statement is or are correct?

[A]. The object to be electroplated is taken as negative electrode.
[B]. One of the most common applications of chemical effect of electric current is electroplating.
[C]. Small amount of a mineral salt present naturally in water makes it a good conductor of electricity.
[D]. All the above
Q3

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
Q4

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
Q5

Which of the following does not conduct electricity?

[A]. Vinegar solution
[B]. Sugar solution
[C]. Lemon juice solution
[D]. Caustic soda solution
Q6

Boojho’s uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory:

[A]. In the nearby river.
[B]. In the nearby pond.
[C]. In the nearby corn field.
[D]. According to the disposal guidelines of the local authority
Q7

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
Q8

Which of the following types of energy can be used can be used to decompose water into its elements?

[A]. Heat energy
[B]. Light energy
[C]. Chemical energy
[D]. Electrical energy
Q9

When electric current is passed through a conducting solution, there is a change of colour of the solution. This indicates:

[A]. The chemical effect of current.
[B]. The heating effect of current.
[C]. The magnetic effect of current.
[D]. The lightning effect of current.
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

In a quiz competition, you are asked a question where you have to choose the statement which is/ are incorrect?

[A]. The chemical decomposition produced by passing an electric current through a conducting liquid is called electrolysis.
[B]. When an electric current flow through a conducting solution, it causes a chemical reaction.
[C]. If electric current is passed through acidified water, then bubbles of oxygen gas and hydrogen gas are produced at the two electrodes immersed in it.
[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

Consider the following statements and choose the correct one:

[A]. Chromium metal has a shiny appearance and it does not rust.
[B]. Tin metal has a shiny appearance and it does not corrode and it is non-poisonous.
[C]. Electroplating is used to give objects made of a cheap metal a coating of a more expensive metal to make them look more attractive.
[D]. All the above
Q17

If there is a solution. But which of the following solutions will not make the bulb glow:

[A]. Sodium chlorides
[B]. Copper sulphate
[C]. Silver nitrate
[D]. Sugar solution in diluted water
Q18

The decomposition produced by passing current through a conducting liquid is called:

[A]. Dialysis
[B]. Hydrolysis
[C]. Electrolysis
[D]. Electroplating
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 can be electroplated with chromium?

[A]. Bakelite and Graphite
[B]. Graphite and Steel
[C]. Steel
[D]. Graphite and Teflon
Q22

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
Q23

The device which can be used to detect very small current flowing in an electric circuit is:

[A]. LEAD
[B]. dB
[C]. MCB
[D]. LED
Q24

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
Q25

For electroplating an iron object with copper metal or copper plating, we should not follow the method is or are:

[A]. The iron object is made negative electrode.
[B]. The copper plate is made positive electrode.
[C]. Iron sulphate solution is taken as electrolyte.
[D]. Copper sulphate solution is taken as electrolyte.

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Last Edited: January 27, 2022