The connecting cable of electrical appliance like electric iron, water heater or room heater contains three insulated copper wires of three different colours-red, green and black. Which one of the following is the correct colour code?

(a) Design and activity with the help of two nails, a very thin aluminium strip, a 12 V Battery and a key to illustrate how an electric fuse works. (b) Cable of a microwave oven has three wires inside it which have insulation of different colour black, green and red. Mention the significance of the three colours and the potential difference between red and black one.

Ten people are sitting in two parallel rows. G,H,J,K and M are sitting in row 1 facing south. V,W,X,Y and Z are sitting in row 2 facing north . The person sitting in row 1exactly faces the person sitting in row 2. they like five different colours, red , white , blue, green and black. exactly two people like the same colour and the persons who like the same colour don't sit in the same row. W sits at one of the extreme ends. there is only one person who sits between W and the one who faces the person who like red colour. K sits to the immediate right of the person who like red colour. There is one person who sits between W and X. X like red colour. Number of persons who sits to the right of X is same as that of number of person who sits to the left of J. The person who likes Green colour sits immediate left of X. two people sit between Z and V. Z sits somewhere to left of V. Z faces the one who like green colour. One of the people who like black colour is an immediate neighbour of the one who like blue colour. M sits left of G. M is an immediate neighbour of H. H faces the person who sits to the immediate right of the person who like black colour. Y and H doesn't like black colour. there is only one person between K and the one who like white colour. Which of the following is correct (i) M and Z like same colour (ii) X sits second to the right of w (iii) J is an immediate neighbor of M and G

Three pin plug is used in the circuit of power devices like electric iron. Which part of the device is connected to the earth pin ?

Shalini is a student of class X. Her mother was preparing tea in an old electric kettle having metal case. When she switched on the electric kettle. she got a severe electric shock. Shalini put off the main switch qUickly and found that the connecting cord was torn, where her mother touched the metal case of the kettle. She also found that the red and black wires of the connecting cord were firmly connected to the two lower terminals of the power plug but the green wire of the cord was not connected to the upper terminal of the plug. Shalini replaced the torn connecting cord and also connected the three wires of the cord firmly to the power plug terminals. On the basis of the above passage, answer the following questions: Which wire red. black or green, touched the metal case of electric kettle when Shalini.s mother got electric shock?

Mr Ghosh recently redecorated his house by coordinating orange and three other colours for the walls, carpets and curtains of four different rooms. From the information below, determine the colours of the carpet, walls and curtains for each of the room and answer the following questions: (a) Yellow was the only colour used in all the four rooms. It was used at least once for walls, carpets and curtains. (b) Three different colours were used in each room but only the dining room and the bedroom were decorated in the same three colours. (c) The same colour was chosen for the curtains in the bedroom, the carpet in the living room and the walls in the dining room. That colour was not used at all in the study room. (d) The only room with both green and grey in its colour scheme had carpet of the same colour as in the dining room. (e) Grey was the only colour used exactly twice-both times for curtains (f) The study room walls were painted the same colour as the living room walls. Which of the two rooms had green carpets ?

List the colours of the three wires in the cable connected to the plug of an electric iron.