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

An electric current can produce:

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

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

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

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

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.
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

Which one of the following solutions will not conduct electricity?

[A]. Lemon juice
[B]. Vinegar
[C]. Tap water
[D]. Vegetable oil
Q13

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
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

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

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 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

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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