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  • Class 8 Science Study Material

An Educational platform for Preparation and Practice Class 8. Kidsfront provide unique pattern of learning Science with free online comprehensive study material in the form of QUESTION & ANSWER for each Chapter of Science for Class 8. This study material help Class 8, Science students in learning every aspect of Chemical Effects of Electric Current . Students can understand Chemical Effects of Electric Current concept easily and consolidate their learning by doing Online Practice Tests on Science,Chemical Effects of Electric Current chapter repeatedly till they excel in Class 8, Chemical Effects of Electric Current . Free ONLINE PRACTICE TESTS on Class 8, Chemical Effects of Electric Current comprise of Hundreds of Questions on Chemical Effects of Electric Current , prepared by the highly professionals team. Every repeat test of Chemical Effects of Electric Current will have new set of questions and help students to prepare themselves for exams by doing unlimited Online Test exercise on Chemical Effects of Electric Current . Attempt ONLINE TEST on Class 8,Science,Chemical Effects of Electric Current in Academics section after completing this Chemical Effects of Electric Current Question Answer Exercise.


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Chemical Effects of Electric Current
A Cathode is a

a) Negative electrode.
b) Positive electrode.
c) Conducting liquid.
d) Connecteing rod.



Answer
Solution
Correct Answer Is : Negative electrode.
Solution Is : An electrode connected to the negative terminal of a battery is taken as the negative electrode(cathode).
If two ends of a wire are dipped in distilled water, the compass needle brought near the circuit

a) Would keep moving in anticlockwise direction continuously.
b) Would keep moving in clockwise direction continuously.
c) Would remain still.
d) Would show deflection.



Answer
Solution
Correct Answer Is : Would remain still.
Solution Is : Distilled water is non-conducting, as it is free from any dissolved salts and impurities.
Battery is having:

a) Two or more cells connected to each other in any manner.
b) Positive terminal of one cell is connected to the positive terminal of the next cell.
c) Two or more cells connected in such a way that the positive terminal of one cell is connected to the negative terminal of the next.
d) Only one cell.



Answer
Solution
Correct Answer Is : Two or more cells connected in such a way that the positive terminal of one cell is connected to the negative terminal of the next.
Solution Is : Battery is having two or more cells connected in such a way that the positive terminal of one cell is connected to the negative terminal of the next.
Anode is a

a) Positive electrode.
b) Negative electrode.
c) Conducting liquid.
d) Connecteing rod.



Answer
Solution
Correct Answer Is : Positive electrode.
Solution Is : An electrode connected to the positive terminal of the battery is taken as the positive electrode(anode).
During electrolysis, copper sulphate solution dissociates into

a) Copper metal only.
b) Copper ions only.
c) Sulphate ions only.
d) Copper ions and sulphate ions.



Answer
Solution
Correct Answer Is : Copper ions and sulphate ions.
Solution Is : When electric current passes through copper suplhate solution, it dissociates into positive cations (copper ions) and negative anions (sulphate ions).
Switch can be connected

a) To the positive terminal of the battery only.
b) Any where in between the circuit elements within the circuit.
c) To the negative terminal of the battery only.
d) First to the positive terminal and then to the negative terminal of the battery.



Answer
Solution
Correct Answer Is : Any where in between the circuit elements within the circuit.
Solution Is : Switch in the `ON` mode makes an electrical circuit closed and continuous such that electric current can flow through it.Hence, it is used only to complete the circuit and so, can be used any where in between the circuit elements in the circuit.
The circuit is discontinuous

a) When the switch is in `OFF` mode.
b) When the switch is in `ON` mode.
c) Without any source of current.
d) Without a bulb.



Answer
Solution
Correct Answer Is : When the switch is in `OFF` mode.
Solution Is : When the switch is turned OFF, the circuit breaks at that point and becomes incomplete.It is said to be open and the current does not flow in the circuit.
The weak current flowing in a circuit can be detected by a

a) LED
b) Battery.
c) Bulb.
d) Bar of metal.



Answer
Solution
Correct Answer Is : LED
Solution Is : The weak current flowing in a circuit does heat the filament to an extent, so as to glow the bulb.In such a case, we use a LED instead of an electric bulb, as it can glow even at very less supply of electricity and it consumes less current.
Electric fuse contains wire that

a) Can melt on passage of electric current of low voltage.
b) Cannot melt.
c) Can melt only on passage of electric current of high voltage.
d) Electric fuse does not contain wire.



Answer
Solution
Correct Answer Is : Can melt only on passage of electric current of high voltage.
Solution Is : An electric fuse is used to prevent damages to electric circuits and fires.It contains a wire made up of a material having low melting point so that in case of passage of high voltage current, the wire will melt and break the circuit; thus, preventing the damage to electrical appliances and possible wires.
In all primary cells chemical energy is changed into

a) Potential
b) Kinetic
c) Electrical
d) Light



Answer
Solution
Correct Answer Is : Electrical
Solution Is : All cells generate electricity.