Physics
Grade-7
Easy
Question
Adding common salt to distilled water makes it
- Good conductor
- Insulator
- None of these
- Both a and b
Hint:
Adding common salt to distilled water makes it a conductor.
The correct answer is: Good conductor
- A conductor is a substance that allows current flow.
- The human body is a good conductor.
- When common salt is dissolved in water, it makes it a conductor.
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Go through the given statements and select the correct option.
Statement 1: In a circuit, the surface of the bulb becomes warmer than the connecting wires when the same current flows through them.
Statement 2: A thin and long wire has higher resistance than a thick and short wire.
Go through the given statements and select the correct option.
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Statement 2: A thin and long wire has higher resistance than a thick and short wire.
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Which of the following does NOT contain a heating element?
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What are the factors upon which the amount of heat produced in a wire depends?
(i) Material
(ii) Length
(iii) Thickness
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(i) Material
(ii) Length
(iii) Thickness
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Select the one in which the heating effect of current is not used.
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Magnetic effects of current were discovered by:
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DIRECTIONS: Read the following two statements carefully and choose the correct options.
Statement 1: The heating up of a thin conducting wire on passing an electric current through it is called the heating effect of current.
Statement 2: Various electrical appliances that are based on the heating effect of current contain a coil of wire called an element.
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Statement 1: The heating up of a thin conducting wire on passing an electric current through it is called the heating effect of current.
Statement 2: Various electrical appliances that are based on the heating effect of current contain a coil of wire called an element.
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In which one of the following conditions the amount of heat produced in a current-carrying wire will increase?
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