Advertisements
Advertisements
प्रश्न
In which of the following applications of Iron, rusting will occur most? Support your answer with valid reason.
| A | B | C | D |
 |
 |
 |
 |
विकल्प
A - Iron Bucket electroplated with Zinc
B - Electricity cables having iron wires covered with aluminium
C - Iron hinges on a gate
D - Painted iron fence
Advertisements
उत्तर
C - Iron hinges on a gate
Iron is in contact with both atmospheric oxygen and moisture/ water vapour.
APPEARS IN
संबंधित प्रश्न
An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.
Identify the figure and give its use.
Give scientific reason :
In the electric equipment producing heat e.g. iron, electric heater, boiler, toaster, etc., an alloy such as Nichrome is used, not pure metals.
Rewrite the following statement by selecting the correct option:
1 A = ____________ mA.
What is the heating effect of electric current?
An electric iron draws a current of 4 A when connected to 220 V mains. Its resistance must be:
What is Joule’s heating effect? How can it be demonstrated experimentally? List its four applications in daily life.
An MCB can be used instead of a fuse in an electrical circuit.
It would cost a man Rs. 3.50 to buy 1.0 kW h of electrical energy from the Main Electricity Board. His generator has a maximum power of 2.0 kW. The generator produces energy at this maximum power for 3 hours. Calculate how much it would cost to buy the same amount of energy from the Main Electricity Board.
Match the following
| 1. | Bulb | a. | Conductor |
| 2. | Electroplating | b. |
Insulator |
| 3. | Pure water | c. | Heating effect of current |
| 4. | Salt solution | d. | Chemical effect of current |
