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.
Gases | H2 | He | O2 | N2 |
The critical temperature in Kelvin | 33.2 | 5.3 | 154.3 | 126 |
From the above data, the order of liquefaction of the given gases is-
(write the order from the gas liquefying first)
1.
2.
3.
4.
The SI unit of viscosity coefficient is-
1. Pascal
2. Nsm-2
3. km-2s
4. Nm-2
Atmospheric pressure recorded in different cities are as follows
Cities | p in N/m2 |
Shimla | |
Bangalore | |
Delhi | |
Mumbai |
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:
Assertion (A): | The temperature at which the vapor pressure of a liquid is equal to the external pressure is called boiling temperature. |
Reason (R): | At high altitudes atmospheric pressure is high. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | (A) is false but (R) is true. |
Given below are two statements:
Assertion (A): | Gases do not liquefy above their critical temperature, even on applying high pressure. |
Reason (R): | Above the critical temperature, the molecular speed is high and intermolecular attractions cannot hold the molecules together because they escape because of high speed. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | (A) is false but (R) is true. |
Given below are two statements:
Assertion (A): | At the critical temperature, the liquid passes into a gaseous state imperceptible and continuously. |
Reason (R): | The density of the liquid and gaseous phase is equal to critical temperature. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | (A) is false but (R) is true. |
Given below are two statements:
Assertion (A): | Liquids tend to have a maximum number of molecules at their surface. |
Reason (R): | Small liquid drops have a spherical shape. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | (A) is false but (R) is true. |