1. What happens when a compass needle is brought near a current carrying wire?
2. Fill in the blanks: The bulb glows when electric current passes through it because of ___________ effect of electric current.
3. Choose the correct option:
During electroplating, the object to be electroplated is made _________.
1. cathode
2. anode
3. Electrolyte
4. None of these
4. State True or False: Adding lemon in water,makes it a good conductor of electricity. 1. true
2. false
5. Sometimes we see that the liquid is conducting but the bulb may not glow. Why?
6. The chemical reaction brought about by an electric current may produce changes in the colour of the solutions.
1. True
2. false
7. Choose the correct option: Electrolytes conduct electricity due to the movement of _________.
1. electrodes
2. atoms
3. ions
4. None of these
8. Choose the correct option: An electrolyte is ___________. 1. a metal
2. a solution
3. a liquid that conducts current
4. None of these
9. Fill in the blanks: Electroplating is used to give more ___________ to the cheap objects.
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Explanation:
1.When a magnetic compass is brought near a current carrying wire, the compass needle gets deflected. ... When a magnetic compass is brought near a current carrying conductor the needle gets deflected because of the magnetic field produced by the current carryung conductor.
2.Heating effect of electric current is responsible for the bulb to glow in an electric circuit. Due to heating effect, the filament of the bulb gets heated to a high temperature and it starts glowing.
3.Electroplating is a process that uses electric current to reduce dissolved metal cations so that they form a coherent metal coating on an electrode.
The part to be plated is the cathode of the circuit. The anode is made of the metal to be plated on the part.
4.(1)
5.The bulb may not glow because of the following reasons: (i) Liquid in the beaker may be non-conducting. In such a case, the electric current would not be able to pass through the liquid. Hence, the circuit will not be complete.
6.(1)
7.(3)
8.(3)
9.hardness