Class 8 Science MCQ Chemical Effects Of Electric Current

Question :Chromium plating is done on many objects such as car parts, bath taps, kitchen gas stove etc. Why?
(a)It does not corrode but prevents scratches
(b)It looks beautiful
(c)It costs less
(d)Articles can be sold at higher price

Question :The process of depositing a layer of any desired metal on another material by means of electricity is called ___________.
(a)Electric plating
(b)Electroplating
(c)Electric depositing
(d)None of the above

Question :Some liquids are good conductors of electricity and some are poor conductors. Which one is a poor conductor?
(a)Acidic solution
(b)Alkaline solution
(c)Common Salt solution
(d)Distilled water

Question : Tin cans, used for storing food, are made by electroplating tin onto iron. Why?
(a)Tin gives a shiny appearance
(b)To make the vessel cheap
(c)Tin is less reactive than iron.
(d)To make the vessel lighter

Question :Plastic wire is
(a) An insulator
(b) A conductor
(c) An insulator and a conductor
(d) None of the options

Question :An electric lamp glows due to
(a) Heating effect
(b) Chemical effect
(c) Magnetic effect
(d) None

Question :Electroplating prevents
(a) Rusting
(b) Current
(c) Chemical effect
(d) All

Question :Flow of electron is called
(a) Electric current
(b) Electroplating
(c) Electrodes
(d) Electrolyte

Question :Distilled water is
(a) Poor conductor
(b) Good conductor
(c) Poor conductor and good conductor
(d) None

Question :Poor conductors are
(a) All of these
(b) Plastics
(c) Clothes
(d) Wood

Question :Copper wire is a
(a) Good conductor
(b) Poor conductor
(c) Good conductor and poor conductor
(d) None of the options

Question :An electrolyte is
(a) A liquid that conducts current
(b) A metal
(c) A solution
(d) All of these

Question :Adding common salt to distilled water makes it
(a) Good conductor
(b) Insulator
(c) No
(d) Both Good conductor and Insulator

Question :Electroplating is based on
(a) Chemical effect of electricity
(b) Magnetic effect of electricity
(c) Heating effect of electricity
(d) Physical effect of electricity

Question : The pure piece of metal which is used to be plated, is made the
(a) anode
(b) cathode
(c) nematode
(d) posit rode

Question : Which of the following solutions is a good conductor of electricity?
(a) Glucose solution
(b) Lemon juice
(c) Alcohol solution
(d) Distilled water
(d) Vegetable oil

Question : The substance which is conductor of electricity is:
(a) rubber
(b) paper
(c) nails
(d) plastic

Question : Which of the following is a good conductor of electricity:
(a) istilled water
(b) tap water
(c) kerosene
(d) none of these

Question : Which of the following does not conduct electricity?
(a) Sugar solution
(b) Vinegar solution
(c) Lemon juice solution
(d) Caustic soda solution

Question : Magnetic compass connected In a circuit is used to check:
(a) magnetism in electric current
(b) slow current
(c) small current
(d) none of these

Question : A sheet of pure copper is used as
(a) cathode
(b) anode
(c) positrode
(d) negatrode

Question : Which of the following non-metals can be electroplated with copper?
(a) Sodium
(b) Iodine
(c) Silicon
(d) Carbon
(e) Phosphorus

Question : Which of the following is not used for electroplating any metal?
(a) Gold
(b) Silver
(c) Sodium
(d) Nickel
(e) Copper

Question : Copper wire is a
(a) Good conductor
(b) Poor conductor
(c) Both a and b
(d) None of this

Question : Iron objects can be protected by electroplating them with
(a) chromium
(b) nickel
(c) zinc
(d) all of these

Question : Waste from an electroplating factory must be disposed off
(a) in the nearby river
(b) in the nearby pond
(c) in the nearby cornfield
(d) according to the disposal guidelines of Waste Management Bodies

Question : The cans, used for storing food, are made by electroplating ___________________ on to irons
(a) chromium
(b) zinc
(c) tin
(d) none of these

Question : Adding lime water to tap water makes it:
(a) an electrolyte
(b) electrolysis
(c) no change occur
(d) none of these

Question : Waste from an electroplating factory must be disposed off
(a) in the nearby river
(b) in the nearby pond
(c) in the nearby cornfield
(d) according to the disposal guidelines of Waste Management Bodies

Question :Distilled water is an insulator.

Question :Electrolyte is a substance which produces ions in a solution.

Question :Pure water is good conductor of electricity.

Question :Bodies of human beings and animals are insulators of electricity.

Question :Electroplating of nickel and chromium on clean iron surface is done by employing the heating effect of current.

Question :Anode is the electrode which is connected to the negative terminal of the battery.

Question :Kerosene is an electrolyte.

Question :Petrol is agood conductor of electricity.

Question :All vegetable oils are non-electrolytes.

Question :Leather is a good conductor of electricity.

Question :Addition of sodium hydroxide in distilled water makes it non-electrolyte.

Question :On passing current in water, bubbles of oxygen are formed on the electrode connected to the positive terminal of the battery.

Question :Electroplating is heating effect of electric current.

Question :On passing electric current through the copper sulphate solution, it dissociates into copper and sulphate.

Question :An electric lamp glows due to ___________________.. effect of electric current.

Question :Addition of caustic soda in distilled water makes it an ___________________

Question :Most liquids that conduct electricity are solutions of ___________________.. and ___________________

Question :Materials which do not allow an electric current to pass through them are called ___________________

Question :Handles of doors are coated with ___________________.. to give them lustre.

Question :Electrolysis occur when the electrolyte is in the ___________________.. state.

Question :The passage of an electric current through a solution causes ___________________.. effect.

Question :If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the ___________________.. terminal of the battery.

Question :Path through which an electric current flows is called ___________________

Question :The ___________________.. of a bulb glows when current passes through it.

Question :The process of depositing a layer of any desired metal on another metallic object, by means of electricity, is called ___________________

Question :Materials which allow an electric current to pass through them are called ___________________

Question :Current flows from ___________________.. terminal to ___________________.. terminal in an electric current.

Question :Materials connected at ___________________.. terminal gets electroplated with desired metals.

Question :Deflection in ___________________.. shows current is passing.

Question :A conducting wire carrying current behaves like a ___________________

Question :Flow of negatively charged electrons is called ___________________

Question :When electricity is passed through a liquid, it causes a ___________________.. change.