Consider the following sentences.
$1$ . In ordinary bulbs only $5 %$ to $10 %$ electrical energy is converted into light energy.
$2$ . Tungsten has very high melting point as $3422^{o}$ C, the filament of bulb is made of it.
$3$ . Mica has good electrical resistance.
$4$ . The electric bulb was first invented by Thomas Alva Edison.
Which of the statements are correct?

1

and

3

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3

and

4

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All of these

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None of these

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Solution

The correct option is C All of these
All the above given statements are facts and so are correct.

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Similar questions

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1

. Filament wire is not uniform.

2

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3

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Which of the given statements are correct?

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Could you please check my answer.

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The correct option is C All of theseAll the above given statements are facts and so are correct.

The correct option is C All of these
All the above given statements are facts and so are correct.