Chemical Effects of Electric Current Class 8 MCQ

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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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