Practice MCQs for Class 8 Science Chapter 14 Chemical Effects of Electric Current
Explore reliable objective questions for Chapter 14 Chemical Effects of Electric Current tailored for Class 8 learners. Utilizing these Science multiple-choice formats ensures thorough preparation and strengthens problem-solving speed for upcoming school assessments.
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Question. In LEDs, the longer lead (wire) is always connected to the _______ terminal
a) negative
b) neutral
c) positive
d) Any terminal
Answer: C
Question. Tap water is a good conductor of electricity while distilled water is not because
a) Tap water contain salts
b) Distilled water do not contain salt
c) Only a) is correct
d) Both a & b is correct
Answer: D
Question. When electrodes are immersed in water and electricity passed, the bubbles formed on the positive terminal is actually _______ gas.
a) Hydrogen
b) Carbon di oxide
c) Oxygen
d) Nitrogen
Answer: C
Question. When electrodes are immersed in water and electricity passed, the bubbles formed on the negative terminal is actually _______ gas.
a) Hydrogen
b) Carbon di oxide
c) Oxygen
d) Nitrogen
Answer: A
Question. Why do we add little dilute sulphuric acid to copper sulphate solution during electroplating?
a) To increase acidity
b) To increase conductivity
c) So that the colour becomes more prominent
d) To burn copper sulphate
Answer: B
Question. A coating of _________is deposited on iron to protect it from corrosion and formation of rust
a) copper
b) aluminium
c) Zinc
d) silver
Answer: C
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
Answer: A
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
Answer: B
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
Answer: D
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
Answer: C
Question: Plastic wire is
a) An insulator
b) A conductor
c) An insulator and a conductor
d) None of the options
Answer: A
Question: An electric lamp glows due to
a) Heating effect
b) Chemical effect
c) Magnetic effect
d) None
Answer: A
Question: Electroplating prevents
a) Rusting
b) Current
c) Chemical effect
d) All
Answer: A
Question: Flow of electron is called
a) Electric current
b) Electroplating
c) Electrodes
d) Electrolyte
Answer: A
Question: Distilled water is
a) Poor conductor
b) Good conductor
c) Poor conductor and good conductor
d) None
Answer: A
Question: Poor conductors are
a) All of these
b) Plastics
c) Clothes
d) Wood
Answer: A
Question: Copper wire is a
a) Good conductor
b) Poor conductor
c) Good conductor and poor conductor
d) None of the options
Answer: A
Question: An electrolyte is
a) A liquid that conducts current
b) A metal
c) A solution
d) All of these
Answer: A
Question: Adding common salt to distilled water makes it
a) Good conductor
b) Insulator
c) No
d) Both Good conductor and Insulator
Answer: A
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
Answer: A
Question. The pure piece of metal which is used to be plated, is made the
(a) anode
(b) cathode
(c) nematode
(d) posit rode
Answer : A
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
Answer : B
Question. A sheet of pure copper is used as
(a) cathode
(b) anode
(c) positrode
(d) negatrode
Answer : A
Question. Which of the following non-metals can be electroplated with copper?
(a) Sodium
(b) Iodine
(c) Silicon
(d) Carbon
(e) Phosphorus
Answer : D
Question. Which of the following is not used for electroplating any metal?
(a) Gold
(b) Silver
(c) Sodium
(d) Nickel
(e) Copper
Answer : C
(a) Good conductor
(b) Poor conductor
(c) Both a and b
(d) None of this
(a) chromium
(b) nickel
(c) zinc
(d) all of these
(a) rubber
(b) paper
(c) nails
(d) plastic
(a) istilled water
(b) tap water
(c) kerosene
(d) none of these
(a) Sugar solution
(b) Vinegar solution
(c) Lemon juice solution
(d) Caustic soda solution
(a) magnetism in electric current
(b) slow current
(c) small current
(d) none of these
(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
(a) chromium
(b) zinc
(c) tin
(d) none of these
(a) an electrolyte
(b) electrolysis
(c) no change occur
(d) none of these
(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
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FAQs
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