Lakhmir Singh and Manjit Kaur Solutions for Chapter: Electricity and Circuits, Exercise 5: Questions Based on High Order Thinking Skills (HOTS)

The positive terminal of an electric cell was connected to a torch bulb fitted in a bulb holder. The other end of bulb holder was connected to a crocodile clip. The negative terminal of cell was connected to another crocodile clip by a wire. When a material X was held between the two free ends of the crocodile clips, the bulb did not glow but when another material Y was held between the two free ends of the crocodile clips, the bulb started glowing. 

Name one material each which could behave like (i) X, and (ii) Y.

The positive terminal of an electric cell was connected to a torch bulb fitted in a bulb holder. The other end of bulb holder was connected to a crocodile clip. The negative terminal of cell was connected to another crocodile clip by a wire. When a material X was held between the two free ends of the crocodile clips, the bulb did not glow but when another material Y was held between the two free ends of the crocodile clips, the bulb started glowing. 

Which part/parts of an electric plug is /are made of materials like (i) X, and (ii) Y?

A and B are two devices. Both these devices have two terminals each. If the two terminals of device A are connected directly by a wire, nothing happens but when the two terminals of device B are connected by a wire directly, it gets damaged quickly. When the two terminals of device B are connected to the two terminals of device A, by copper wires, then part C of device A gets heated and glows to produce light. What could be device A?

A and B are two devices. Both these devices have two terminals each. If the two terminals of device A are connected directly by a wire, nothing happens but when the two terminals of device B are connected by a wire directly, it gets damaged quickly. When the two terminals of device B are connected to the two terminals of device A, by copper wires, then part C of device A gets heated and glows to produce light.

What could be device B?

A and B are two devices. Both these devices have two terminals each. If the two terminals of device A are connected directly by a wire, nothing happens but when the two terminals of device B are connected by a wire directly, it gets damaged quickly. When the two terminals of device B are connected to the two terminals of device A, by copper wires, then part C of device A gets heated and glows to produce light.

Name the part C of device A.

A and B are two devices. Both these devices have two terminals each. If the two terminals of device A are connected directly by a wire, nothing happens but when the two terminals of device B are connected by a wire directly, it gets damaged quickly. When the two terminals of device B are connected to the two terminals of device A, by copper wires, then part C of device A gets heated and glows to produce light.

 In which device, A or B, the two terminals are marked + and -?

A student made a circuit by using an electric cell, a switch, a torch bulb (fitted in the bulb holder) and copper connecting wires. When he 'turned on' the switch, the torch bulb did not glow at all. The student checked the circuit and found that all the wire connections were intact. What could be the possible reason for the torch bulb not glowing even when the circuit appears to be complete?

A student made a circuit by using an electric cell, a switch, a torch bulb (fitted in the bulb holder) and copper connecting wires. When he 'turned on' the switch, the torch bulb did not glow at all. The student checked the circuit and found that all the wire connections were tight. What could have caused the above condition?