Which of the following precautions need not be taken while using electric gadgets/appliances/circuits? (a) We should never touch a lighted electric bulb connected to the mains. (b) We should never experiment with the electric supply from the mains or a generator or an inverter. (c) We should never use just any wire or strip of metal in place of a fuse. (d) We should never turn the switch in the ON position.

We should never touch a lighted electric bulb connected to the mains.

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We should never experiment with the electric supply from the mains or a generator or an inverter.

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We should never use just any wire or strip of metal in place of a fuse.

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We should never turn the switch in ON position.

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Solution

The correct option is D
We should never turn the switch in ON position.

Electric switch:
A basic manual electromechanical unit is the most common type of electric power switch.
When a switch is in the ON position, it completes the circuit and allows the current to flow through.
Similarly, a switch is in the OFF position when it breaks the circuit and prevents current from passing through.
Hence, Option(D) is correct.

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Question 5

Which of the following precautions need not be taken while using electric gadgets/appliances/circuit?

(a) We should never touch a lighted electric bulb connected to the mains

(b) We should never experiment with the electric supply from the mains or a generator or an inverter

(d) We should never turn the switch in ON position

Fill in the blanks:

(a) The unit in which we pay the cost of electricity is ___

(b) The electrical energy consumed in a house is measured by ___

(d) A switch is connected to the ___ wire.

(e) The red colour insulated wire in a cable is the ___ wire.

(f) One kilowatt hour is equal to ___ joule.

(g) A fuse wire should have low ___.

Fill in the following blanks with suitable words :

(a) A fuse should always be placed in the ........... wire of a mains circuit.

(b) The earth wire should be connected to the ............ of an appliance.

Write true or false for each statement:

(a) A fuse wire has a high melting point.

(b) Flow of protons constitutes electric current.

(d) S.I. unit and commercial unit of electrical energy are same.

(e) Overloading of electric current in circuits can lead to short circuiting.

(f) Our body can pass electricity through it.

(g) The metallic cases of all appliances are insulators of electricity.

(h) The earth wire protects us from an electric shock.

(i) A switch should not be touched with wet hands.

(j) All electrical appliances in a household circuit work at the same voltage.

(k) In a cable,the green wire is the live wire.

(l) A fuse is connected to the live wire.

(m) A switch is connected to the neutral wire.

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