Chemical Effects of Electric Current Class 8 MCQ. We covered all the Chemical Effects of Electric Current Class 8 MCQ 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 MCQ Objective for Students
The device used for converting alternating current to direct current is called
(A) Inverter
(B) Rectifier
(C) Transformer
(D) Transmitter
Option b – Rectifier
Alternating current is converted to direct current
(A) By Dynamo
(B) By Motor
(C) By Transformer
(D) By Rectifier
Option d – By Rectifier
Which is the gas inside an electric bulb?
(A) Argon
(B) Nitrogen
(C) Carbon dioxide
(D) Both (A) and (B)
Option d – Both (A) and (B)
Fluorescent tubes are fitted with a choke. The choke coil
(A) Steps up the line voltage
(B) Steps down the line voltage
(C) Reduces current in the circuit
(D) Chokes low-frequency current
Option a – Steps up the line voltage
A mobile phone charger is
(A) An inverter
(B) A UPS
(C) A step-up transformer
(D) A step-down transformer
Option d – A step-down transformer
If potential difference and current flowing through a wire are increased twice each, then electric power
(A) Will remain unaffected
(B) Will increase four times
(C) Will increase two times
(D) Will decrease by half
Option b – Will increase four times
Two wires have their lengths, diameters, and resistivities all in the ratio of 1: 2. If the resistance of the thinner wire is 10 ohms, the resistance of the thicker wire is
(A) 5 ohm
(B) 10 ohm
(C) 20 ohm
(D) 40 ohm
Option b – 10 ohm
The transformer is used for
(A) Converting AC into DC
(B) Converting DC into AC
(C) To step up DC voltages
(D) To step up or step down AC voltages
Option d – To step up or step down AC voltages
Alternate current is not preferable
(A) To charge the storage battery
(B) To run/start an electric motor
(C) To transmit electric power
(D) To heat up the electric toaster
Option a – To charge the storage battery
We covered all the chemical effects of electric current class 8 mcq above in this post for free so that you can practice well for the exam.
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