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Physics

Physics
Red light has a wavelength of 70 A°. In "nm" it is

0.07 nm
700 nm
7 nm
70 nm

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Physics
The pressure exerted by a 760 mm column of mercury at 0°C is known as

1 bar
1 poise
1 pascal
1 atmosphere

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Physics
Which one of the waves have the longest wavelength

Blue
Green
Violet
Red

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Physics
Working of safety fuses depends upon1. magnetic effect of the current2. chemical effect of the current3. magnitude of the current4. heating effect of the currentSelect the correct answer using the code given below.

4 only
3 and 4 only
1, 2, 3 and 4
1, 2 and 3 only

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Physics
The surface tension of water on adding detergent to it

Increases
No change
Decreases
Becomes zero

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Physics
It is difficult to fix a nail on a freely suspended wooden frame. Which law supports this statement?

Pascal's law
Newton's second law
Newton's third law
Law of inertia

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