Question
Zubeda made an electric circuit using a cell holder shown in Figure, a switch and a bulb. When she put the switch in the ‘ON’ position, the bulb did not glow. Help Zubeda in identifying the possible defects in the circuit.
✓
Answer
One of the reasons may be that the rubber band used in the cell holder may not be tight enough to keep the two cells in contact with each other. If the cells are not in proper contact with each other, then the circuit will not be complete and current will not flow through the circuit. Hence, the bulb will not glow.
The other reason may be that the two cells are not connected properly. The negative terminal of one cell must be connected to the positive terminal of the other cell.
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Q.1. Which property was she observing?
(a) Lustre$\quad$(b) Malleability
(c) Ductility$\quad$(d) Sonority
Q.2. Why was iron chosen?
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→Anandi watched Sudarshan uncle beating a red-hot piece of iron to make a tool. She noted that it became flat without breaking and retained its shine even after hammering.
Q.1. Which property was she observing?
(a) Lustre$\quad$(b) Malleability
(c) Ductility$\quad$(d) Sonority
Q.2. Why was iron chosen?
(a) It is soft$\quad$(b) It is malleable
(c) It is colourful$\quad$(d) It melts quickly
Q.3. What would happen if he used sulphur instead?
(a) It would flatten$\quad$(b) It would melt
(c) It would break$\quad$(d) It would shine
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Across
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