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Which device is used to measure very low temperatures?

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Questions featured in Previous Year Papers on Physics

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UPSC CDS
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Science Express>Chapter -1 - Physics>Exercise 1>Q 118
For an object, potential energy at a height is known as _____.
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UPSC CDS
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Science Express>Chapter -1 - Physics>Exercise 1>Q 20
The speed of sound is maximum in _____: