Advertisements
Advertisements
प्रश्न
Observe the following circuits carefully. In which circuit will the bulb glow? Write Yes or No in the blank space provided along each of the circuit given in the figure.
(a) |
Piece of coal |
______ |
(b) |
Iron nail |
______ |
(c) |
Eraser |
______ |
(d) |
Steel spoon |
______ |
उत्तर
- No, because piece of coal is a poor conductor of electricity.
- Yes, because iron nail is a good conductor of electricity.
- No, because eraser is a poor conductor of electricity.
- Yes, because steel spoon is a good conductor of electricity.
APPEARS IN
संबंधित प्रश्न
Electroplating is an example for ______.
An electric current can produce
Boojho and Paheli performed experiments taking similar bulbs and cells but two different solutions A and B as shown in the figure.
![]() |
![]() |
Boojho's Experiment | Paheli's Experiment |
(A) | (B) |
They found that the bulb in the set up A glows more brightly as compared to that of the set up B. You would conclude that
Which of the following metals is used in electroplating to make objects appear shining?
Paheli set up an experiment using liquid A in the beaker as shown in the figure. She observed that the bulb glows. Then, she replaced the liquid A by another liquid B. This time the bulb did not glow. Boojho suggested replacing the bulb by an LED. They observed that the LED glows. Explain.
Why is tin electroplated on iron to make cans used for storing food?
You are provided with a magnetic compass, an empty matchbox, a battery of two cells and connecting wires. Using these objects, how will you make a tester for testing an electric circuit? Draw the necessary circuit diagram and explain.
A chemical reaction happens when electricity passes through various conducting liquids.
Match the following
1. | Anode | a. | Conducting solution |
2. | Cathode | b. | Positive terminal |
3. | Ions | c. | Negative terminal |
4. | Electrolyte | d. | Positively or negatively charged |
State some advantages of electroplating.