Why gases show high compressibility?
Q.1. Why gases show high compressibility?
Ans. Due to low intermolecular force of attraction between the particles of gases.
Q.2. Why perspiration keeps our body cool?
Ans. During evaporation of sweat, latent energy of vaporisation is absorbed from the body and we feel cool.
Q.3. Give the reason for the existence of the three states of matter.
Ans. Three states of matter exist due to difference with respect to their :
(i) interparticle space (ii) interparticle force (iii) kinetic energy
Q.4. Explain why the temperature remains constant during sublimation.
Ans. During the process of sublimation, heat given to the system is used up to evaporate solid into vapours keeping constant temperature.
Q.5. A substance has no mass. Can we consider it as matter?
Ans. No, because matter has a definite mass.
Q.6. A diver is able to cut through water in a swimming pool. Which property of matter does this observation show? (SAL 2014)
Ans. Particles of water are held together by forces of attraction. It is these forces of attraction, which the diver cuts through water in the swimming pool.
Q.7. Rate of diffusion is faster in gases. Why?
Ans. The molecules of gases have larger intermolecular space and higher kinetic energy (speed), so they diffuse fast.
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