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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
Which device is used to convert Alternating Current into direct current?
a) Inverter
b) Rectifier
c) Transformer
d) Transmitter
Option b – Rectifier
Alternating Current can be changed into direct current using
a) A dynamo
b) A motor
c) A transformer
d) A rectifier
Option d – A rectifier
Which gas or gases are filled inside an electric bulb?
a) Argon
b) Nitrogen
c) Carbon dioxide
d) Argon and nitrogen
Option d – Argon and nitrogen
A choke is used in fluorescent lamps. The function of the choke coil is to
a) Increase the supply voltage momentarily
b) Decrease the supply voltage
c) Limit the current in the circuit
d) Block low-frequency current
Option a – Increase the supply voltage momentarily
A mobile phone charger essentially works as
a) An inverter
b) A UPS
c) A step-up transformer
d) A step-down transformer
Option a – An inverter
If both the potential difference and the current in a conductor are doubled, the electric power will
a) Remain the same
b) Become four times
c) Become twice
d) Reduce to half
Option b – Become four times
Two wires have their lengths, diameters, and resistivities in the ratio 1 : 2. If the resistance of the thinner wire is 10 ohms, what will be the resistance of the thicker wire?
a) 5 ohm
b) 10 ohm
c) 20 ohm
d) 40 ohm
Option b – 10 ohm
A transformer is primarily used to
a) Convert AC into DC
b) Convert DC into AC
c) Increase DC voltage
d) Increase or decrease AC voltage
Option d – Increase or decrease AC voltage
Alternating Current is not suitable for
a) Charging storage batteries
b) Running electric motors
c) Transmitting electric power
d) Heating an electric toaster
Option a – Charging storage batteries
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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