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Chemical Effects of Electric Current Class 8 Extra Questions. We covered all the Chemical Effects of Electric Current Class 8 Extra Questions in this post for free so that you can practice well for the exam.
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Chemical Effects of Electric Current Class 8 Extra Objective Questions for Students
Which element is known to be the most efficient conductor of Electricity?
a) Silver
b) Copper
c) Aluminium
d) Iron
Option a – Silver
A fuse is installed in the main electrical circuit as a protective device. Which statement about a fuse is correct?
a) It is connected parallel to the main switch
b) It is primarily made of silver alloys
c) It should possess a low melting point
d) It must have extremely high resistance
Option c – It should possess a low melting point
The working principle of a fuse is based on
a) Chemical effect of electric current
b) Mechanical effect of electric current
c) Heating effect of electric current
d) Magnetic effect of electric current
Option c – Heating effect of electric current
A fuse wire generally has
a) Low resistance and a high melting point
b) Low resistance and a low melting point
c) High resistance and a low melting point
d) High resistance and a high melting point
Option c – High resistance and a low melting point
Which metal is commonly used as the filament in electric bulbs?
a) Iron
b) Molybdenum
c) Silver
d) Tungsten
Option d – Tungsten
The operating temperature of the filament in a glowing electric bulb is usually
a) Between 100°C and 500°C
b) Between 1000°C and 1500°C
c) Between 2000°C and 2500°C
d) Between 3000°C and 3500°C
Option c – Between 2000°C and 2500°C
In a three-pin electrical plug, the longest pin is meant for connection to
a) The Earth terminal
b) The live terminal
c) The neutral terminal
d) Any of the terminals
Option a – The Earth terminal
In electrical appliances, earthing is provided mainly
a) To reduce cost
b) Because the appliance works on three-phase supply
c) To ensure safety
d) As a substitute for a fuse
Option c – To ensure safety
Electric current will not flow between two charged bodies connected by a conductor if both have
a) The same type of charge
b) The same capacitance
c) The same resistivity
d) The same electric potential
Option d – The same electric potential
We covered all the chemical effects of electric current Class 8 extra Questions above in this post for free so that you can practice well for the exam.
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