Class 8 Chemical Effects of Electric Current Extra Questions. We covered all the Class 8 Chemical Effects of Electric Current Extra Questions in this post for free so that you can practice well for the exam.
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Class 8 Chemical Effects of Electric Current Extra Objective Questions for Students
What gases are filled in fluorescent tubes?
(A) Neon
(B) Sodium
(C) Mercury
(D) Mercury and neon
Option d – Mercury and neon
In comparison to an electric bulb, a fluorescent tube is preferred because
(A) It has a greater external outer surface to radiate/emit the light
(B) There is no effect of voltage fluctuation on it
(C) In the tube, electric energy is almost converted into light energy
(D) None of the above
Option d – None of the above
How does the white light produce in the tube?
(A) To heat up the copper wire
(B) To heat up the filament
(C) To accelerate the atoms
(D) To oscillate molecule
Option b – To heat up the filament
Fuse wires used for the safety of households have
(A) Low melting point
(B) High melting point
(C) High resistance
(D) Both (A) and (C)
Option d – Both (A) and (C)
The filament of a halogen lamp is an alloy of
(A) Tungsten and iodine
(B) Tungsten and bromine
(C) Tungsten and sodium
(D) Molybdenum and sodium
Option c – Tungsten and sodium
Domestic electrical wiring is basically an
(A) Series connection
(B) Parallel connection
(C) Combination of series and parallel connections
(D) Series connection within each room and parallel connective elsewhere
Option b – Parallel connection
A wire with black insulation during electric supply is
(A) Live wire
(B) Earth wire
(C) Neutral wire
(D) Fuse wire
Option c – Neutral wire
Which gas is filled in normal tube lights?
(A) Sodium vapor with argon
(B) Sodium vapor with neon
(C) Mercury vapor with argon
(D) Mercury vapor with neon
Option c – Mercury vapor with argon
The full form of C.F.L. is
(A) Compact Fluorescent Lamp
(B) Centrally Fixed Lamp
(C) Chemical Fluorescent Lamp
(D) Condensed Fluorescent Lamp
Option a – Compact Fluorescent Lamp
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