Q15 of 20 Page 77

Why do we cover plug pin holes which are within the reach of children with cellotape or a plastic cover when not in use?

We cover plug pin holes which are within the reach of children with cello tape or a plastic cover when not in use to prevent children from getting an electric shock. If a child puts his finger in the electric socket, he may get shocked which could be fatal.


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13

Can we use the same fuse in a geyser and a television set? Explain.

 14

Name two electric devices for each were (i) heating effect of the current is used and (ii) the magnetic effect of current is used.

 16

Boojho made an electromagnet by winding 50 turns of wire over an iron screw. Paheli also made an electromagnet by winding 100 turns over a similar iron screw. Which electro magnet will attract more pins? Give reason.

 17

Your teacher has shown you the following activity.


Activity: Teacher has wound a long insulated piece of wire around an iron nail in the form of a coil. Free ends of the wire are connected to a cell through a switch as shown in the Figure 14.3. The current is switched on and some pins are placed near the ends of the nail.


Write down any three questions that come to your mind about this activity.