The spherical shape of rain droplets is due to-

1. Viscosity

2. surface tension

3. Critical phenomenon

4. Pressure

Gases possess characteristic critical temperature which depends upon the magnitude of intermolecular forces between the particles. Following are the critical temperatures of some gases.

From the above data, the order of liquefaction of the given gases is-
(write the order from the gas liquefying first)
1. ${\mathrm{H}}_2,$ $\mathrm{He},$ ${\mathrm{O}}_2,$ ${\mathrm{N}}_2$
2. $\mathrm{He},$ ${\mathrm{O}}_2,$ ${\mathrm{H}}_2,$ ${\mathrm{N}}_2$
3. ${\mathrm{N}}_2,$ ${\mathrm{O}}_2,$ $\mathrm{He,}$ ${\mathrm{H}}_2$
4. ${\mathrm{O}}_2,$ ${\mathrm{N}}_2,$ ${\mathrm{H}}_2,$ $\mathrm{He}$

The SI unit of viscosity coefficient $\left(\mathrm{\eta }\right)$ is-

1. Pascal

2. Nsm^-2

3. km^-2s

4. Nm^-2

Atmospheric pressure recorded in different cities are as follows

The liquid will boil first at -

1. Shimla

2. Bangalore

3. Delhi

4. Mumbai

Increase in kinetic energy can overcome intermolecular forces of attraction. How will increase in temperature effect the viscosity of liquid-

1. Increase

2. No effect

3. Decrease

4. No regular pattern will be followed

With increase in temperature the surface tension of a liquid will:

1. Remains same

2. Decreases

3. Increases

4. No regular pattern is followed

Given below are two statements: 

Given below are two statements: 

Given below are two statements: 

Given below are two statements: