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 the best conductor of electricity?
(A) Silver
(B) Copper
(C) Aluminium
(D) Iron
Option a – Silver
A fuse is used in the main electric supply as a safety device. Which one of the following statements about the fuse is correct?
(A) It is connected in parallel with the main switch
(B) It is made mainly from silver alloys
(C) It must have a low melting point
(D) It must have a very high resistance
Option c – It must have a low melting point
The principle of fuse is
(A) the Chemical effect of electricity
(B) the Mechanical effect of electricity
(C) the Heating effect of electricity
(D) the Magnetic effect of electricity
Option c – the Heating effect of electricity
A fuse wire is characterized by
(A) Low resistance and high melting point
(B) Low resistance and low melting point
(C) High resistance and low melting point.
(D) High resistance and high melting point
Option c – High resistance and low melting point
Which of the following metals is used as filament in lighting bulbs?
(A) Iron
(B) Molybdenum
(C) Silver
(D) Tungsten
Option d – Tungsten
The temperature of the filament of a lighted electric bulb is generally
(A) 100°C to 500°C
(B) 1000°C to 1500°C
(C) 2000°C to 2500°C
(D) 3000°C to 3500°C
Option c – 2000°C to 2500°C
In a three-pin electrical plug, the longest pin should be connected to
(A) the Ground terminal
(B) the Live terminal
(C) the Neutral terminal
(D) Any terminal
Option a – the Ground terminal
In electric apparatus ‘Earth’ is used
(A) To reduce the expenditure
(B) Because the apparatus used 3-phase
(C) For safety
(D) In the form of a fuse
Option c – For safety
The electric current does not flow between two properly connected charged bodies if they are having
(A) the Same charge
(B) the Same capacity
(C) the Same resistivity
(D) the Same potential
Option d – the Same 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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