Class 8 Science Chapter 14 MCQ (Multiple Choice Questions) of Chemical Effects of Electric Current updated for new academic session 2022-2023. 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 2022-2023

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

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
Q2

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
Q3

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
Q4

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

[A]. The liquids that conduct electricity are solution of acids, bases and salts in water.
[B]. Liquid which can conduct electricity is called an electrolyte.
[C]. The liquids which conduct electricity are called conducting liquids.
[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

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

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

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

Which of the following is a weak electrolyte?

[A]. Carbonic acid
[B]. Sodium hydroxide
[C]. Copper sulphate
[D]. Nitric acid
Q15

Which of the following metals is used in electroplating to make objects appear shining?

[A]. Iron
[B]. Copper
[C]. Chromium
[D]. Aluminium
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

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
Q19

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
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

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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