Physics and Chemistry 1 MARK QUESTIONS

Convert 30℃ into Kelvin scale

Answer explanation

303K

State the principle of method of mixtures.

What is Humidity?

Why pure acetic acid does not conduct electricity?

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

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

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.

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

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

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