You can make an electric question board to tell the name of a bird in one of the pictures. You have to touch one end of a wire to the screw tip under a bird picture and the other end of the wire to the screw tip under the name you think right. If you have selected a right name, the lamp will light.

YOU REQUIRE

One thin hard board (1/8” X 12" x 8"), 24 screws and bolt 1/8” BSW x 1” long.
12 pictures of different birds along with their names
Plastic-coated wire
Two dry cells connected in series
One 3-volt bulb fitted in a bulb holder

WHAT TO DO

Take a thin hardboard of the size 1/8" x12"x8". Mark places for the bird pictures and for the name cards. Glue or pin them with board pins at the places as shown in Fig. 4
Make a hole under each card and each bird. Screw a nut on each bolt as shown in Fig. 1 and 2.
Now, at the back of the board, fasten a wire from the bolt under a picture to the bolt under the right name. Do this for each picture and card. (Fig. 2 & 3).

Now, connect a bulb through two dry cells as shown in the figure. Scrape the ends of the two wires. (Fig. 4.)

Now, touch one end of the wire to the bolt under the bird and the other end to the bolt under the name card which you have thought as the correct name. If your   answer is right, the bulb will glow.

In fact, the wire on the back of the board has completed the circuit of the bulb, that is why it glows.


Note: You can make such electric question boards by using pictures of flowers and their names, pictures of animals and their names, pictures of famous buildings and their names, etc.

1. OPEN THE FILES IN ITERNET EXPLORER.
2. RIGHT CLICK THE ABOVE LINK.
3. FROM THE CONTEXT MENU CHOOSE 'SAVE TARGET AS'