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

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

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
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 of the following is a weak electrolyte?

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

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

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

[A]. Dialysis
[B]. Hydrolysis
[C]. Electrolysis
[D]. Electroplating
Q20

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.
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

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
Q24

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
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

Download App for Class 8

Free NCERT Solutions and Study Material

The content available on Tiwari Academy is free to use. No login is required to access the contents. NCERT Solutions, Important Questions, MCQ Online test and other online study material is free to use. If any use face accessibility problem, please contact us for help.