Question1.

The rate of evaporation depends upon

(a) surface area

(b) temperature

(c) humidity

(d) all of these

Question 2.

On summer days, I was serving a glass of cold fruit Juice to our guest and I observed water droplet on to the outer wall of the glass, why it happened ?

Question3.

Why sanitizer or acetone gives you cooling sensation?

Question4.

Why our clothes dry faster on windy days?

Question5.

Define the process evaporation.

Question6.

What do you mean by dry ice and what is the process of preparing it?

Question7.

What is latent heat of vaporization?

Question8. 

Mark the incorrect statement for the following.

(a) The arrangement of particles is most ordered in the case of solids.

(b) The states of matter are inter-convertible.

(c) Boiling is a surface phenomenon while Evaporation is a bulk phenomenon.

(d) The rate of evaporation depends upon wind speed.

Question9.

The energy required to change 1 kg of solid into liquid at its melting point is called

(a) latent heat of vaporization.

(b) latent heat of melting.

(c) latent heat of fusion.

(d) latent heat of evaporation.

Question10.

Give the name of following conversion.

Question11.

Convert the following to the Celsius scale:

(a) 398K                    (b) 250K                    (c) 100K

Question12.

Which of the following have high melting point  and what does the melting point indicates -

(a) iodine solid

(b) NaCl solid

(c) solid CO₂

(d) ammonium nitrate

Question13.

The rate of diffusion of liquids is -

(a) lower that the solid

(b) equal to solid

(c) higher than the solid

(d) negligible compare to solid

Question14.

The atmospheric pressure at sea level is –

(a) one pascal

(b) zero pascal

(c) three pascals

(d) ten pascals  

Question15.

Effusion is _________.

Question16.

Why camphor left no traces, when I keep it in an open surrounding?

Question17.

Arrange the following

Gas , liquid and solid

In increasing order of –

(a) Kinetic energy  (b) Arrangement particle (c) Rate of Diffusion (d) Compressibility (e) Rigidity

Question18.

1 atmosphere is equal to 

(a) 1.01 × 10⁵ Pa.

(b) 1.01 x 10^-14 Pa

(c) 1.10 x 10¹⁵ Pa

(d) 10.1  x 10¹⁴ Pa

Question19.

Particles in plasma are in form of

(a) ionised particle

(b) electrons

(c) ionises gases

(d) neutrons

Question20.

Match the following:

(a) Pressure                  -           kgm^-3

(b) Temperature          -           Pa

(c) Density                    -           m³

(d) Volume                    -           J

(e) Heat                          -           K

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