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प्रश्न
Mark the correct choice
- Assertion: Electric appliances with a metallic body have three wire connections.
- Reason: Three-pin connections reduce the heating of the connecting wires.
विकल्प
if both the assertion and the reason are true and the reason is the correct explanation of the assertion.
if both the assertion and the reason are true, but the reason is not the correct explanation of the assertion.
if the assertion is true, but the reason is false.
if the assertion is false, but the reason is true.
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उत्तर
If the assertion is true, but the reason is false.
Correct Reason:
Three-pin connections to protect the electrical shock. Because appliances carry a high electric current.
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संबंधित प्रश्न
An electric iron of resistance 20 Ω takes a current of 5 A. Calculate the heat developed in 30 s.
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What property of the filament wire accounts for this difference?
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Which of the following substance contracts on heating?
What is a short circuit?
What does overloading cause?
An electric kettle consumes 1 kW of electric power when operated at 220 V. A fuse wire of what rating must be used for it?
(a) Observe the diagram given below and state whether the bulb will glow or not when we switch on K.
(b) Is it safe to handle the bulb when the switch is OFF?
(c) Give a reason for your answer in (b).
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 |
In the electric equipment producing heat like iron, electric heater, boiler, toaster etc., an alloy such as nichrome is used, not pure metals.
