Physics and Chemistry 1 MARK QUESTIONS

Convert 30℃ into Kelvin scale

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Answer explanation

303K

State the principle of method of mixtures.

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What is Humidity?

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Why pure acetic acid does not conduct electricity?

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What it is to be formed when an acid or base mixed with water?

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Which chemical substance is used by doctors as a plaster for supporting broken bones? Write its chemical formula.

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Why do stars appear twinkling? (or) What is the reason for twinkling of stars Ans: Stars appear twinkling due to multiple refractions of light through different atmospheric layers with different refractive indices.

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Write Snell's law? Ans: n1 sin i = n2 sin r (or) sin 𝑖/ sin 𝑟 = 𝑐𝑜𝑛𝑠𝑡𝑎𝑛𝑡

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Which phenomenon do you observe from the figure? Ans: Total internal reflection

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Write the applications of total internal reflection Ans: Brilliance of diamond, optical fibres, formation of mirages etc

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