Draw a well-labelled diagram of a dry cell. Explain the function of the chemicals manganese dioxide and ammonium chloride used in it.
Important Questions on Electric Current and Circuit
Look at the given picture and answer the questions asked.
What would happen if the negative terminals of both the cells are in contact?
Look at the given picture and answer the questions asked.
What would happen if the electric wire is changed with a plastic wire? Give reason.
Look at the given picture and answer the questions asked.
What are the necessary conditions for an electric circuit to work?
In the following table, put a tick in the boxes for the material (X) that will cause the alarm to sound.
| Material X | Will the alarm sound? |
|---|---|
| Aluminium rod | |
| Zinc plate | |
| Carbon rod | |
| Rubber sole | |
| Glass bottle |
Identify the property that the material 'X' must possess to sound an alarm.
He then tested the circuit using rod ‘p’ and observed if the bulb lit up. He then repeated the experiment using other rods ‘Q’ and ’R’. He placed each rod near some paper clips and observed if the rod attracted the paper clips. He recorded his observations as shown below.
| Rod | Bulb lit up | Attracted paper clips |
| P | X | X |
| Q |  |
 |
| R |  |
X |
Which of the following materials could have been used to make rods P, Q, and R?
|
Rod P |
Rod Q |
Rod R |
|
| a | Metallic | Non-metallic | Metallic |
| b | Non-metallic | Metallic | Metallic |
| c | Non-metallic | Non-metallic | Metallic |
| d | Non-metallic | Metallic | Non-metallic |
Study the given picture and answer the questions asked.
Label all the parts of the electric torch.
Study the given picture and answer the questions asked.
What will you do to turn off the torch light?
He obtained the following result.
a) Name another pair of paper clips, which is not mentioned in the given table but would result in the bulb lighting up when connected.
b) Based on the result obtained, draw the correct circuit diagram to represent the given hexagonal circuit card.
