ICSE Class 10th Science Chapter 9 - Household Circuits Important Questions with Answers

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Name the wire to which this electrical component is connected in an electric circuit.

Question 2.

According to the old convention, the colour of the earth wire is ______.

Black

Green

Yellow

Red

Question 3.

If live wire makes an accidental contact with the metal case, which circuit (A or B) in the diagram, illustrating an electric iron, is considered safe for the user (Assuming the fuse is present in the live wire in both circuits)? Justify your answer.

Question 4.

To which wire of a cable in a power circuit should the metal case of geyser be connected.

Question 5.

To which wire should the fuse be connected?

Question 6.

Name the color code of the wire which is connected to the metallic body of an appliance.

Question 7.

Draw the diagram of a dual control switch when the appliance is switched ‘ON’.

Question 8.

Explain the meaning of the student 'current rating of a fuse is 5A'.

Question 9.

In the transmission of power the voltage of power generated at the generating stations is stepped up from 11kV to 132 kV before it is transmitted. Why?

Question 10.

State the characteristics required in a material to be used as an effective fuse wire.

Question 1.

At what voltage is this current available to our household?

Question 2.

For a fuse, higher the current rating ________ is the fuse wire.

Question 3.

Name the device used to increase the voltage at a generating station.

Question 4.

Name the wire in a household electrical circuit to which the switch is connected

Question 5.

Identify the following wires used in a household circuit: The wire is also called as the phase wire.

Question 6.

Identify the following wires used in a household circuit: The wire is connected to the top terminal of a three pin socket.

Question 7.

A fuse is rated 8A. Can it be used with an electrical appliance rated 5 KW, 200 V ? Give a reason.

Question 8.

An electric iron is rated 220V, 2kW.

1) if the iron is used for 2h daily find the cost of running it for one week if it costs 4.25 per kWh

2) Why is the fuse absolutely necessary in a power circuit?

Question 9.

(i) Write one advantage of connecting electrical appliances in parallel combination.
(ii) What characteristics should a fuse wire have ?
(iii) Which wire in a power circuit is connected to the metallic body of the appliance ?

Question 10.

The diagram below shows a dual control switch circuit connected to a bulb.

(i) Copy the diagram and complete it so that the bulb is switched ON.
(ii) Out of A and B which one is the live wire and which one is the neutral wire ?