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Chemistry Fsc Part 1 Online Test
| Sr. # | Questions | Answers Choice |
|---|---|---|
| 1 | When does a liqudi start boiling. |
<p>When temperatur reahes 100 oC</p> <p>When its vaporu pressur eequals atmospheric pressure</p> <p>When all molecules turn into vapour</p> <p>When surface tension becomes zero</p> |
| 2 | Why does aceton feel colder than water when pured on skin. |
<p>It absorb moisture</p> <p>It has lower boiling point and evaporates faster</p> <p>It rreacts with skin</p> <p>It is more viscous</p> |
| 3 | Why does acetone feel colder than water when poured on skin. |
<p>It reacts with skin</p> <p>It has lower boiling point and evaporate faster</p> <p>It is more viscous</p> <p>It absorbs moisture</p> |
| 4 | At equilibrium in a closed system, which two processes occur at tha same rate. |
<p>Mellting and Freezing </p> <p>Evporation and condensation </p> <p>Sublimation and condensation </p> <p>Evaporation and boiling</p> |
| 5 | At equilibrium in a clsoed system, whcih two processes occur at the same rate. |
<p>Melting and freezing</p> <p>Evaporation and boiling</p> <p>Evporatin and condensation</p> <p>Sublimation and condensation</p> |
| 6 | What is vapour pressure. |
<p>Atomospheric pressure.</p> <p>Pressure exerted by aliqudi at 0 oC</p> <p>pressure exercted by vaporus in equilibrium with their liqudi at a given temperature</p> <p>Pressrue inside the liquid only</p> |
| 7 | Earthenware pots keep water cool because. |
<p>They are made of clay</p> <p>They reflect sunlight</p> <p>They absorb water</p> <p>They allow water to wvaporate through pores</p> |
| 8 | Which of the following has greater viscosity than water |
<p>Glycerine</p> <p>Hexane</p> <p>Acetone</p> <p>Methanol</p> |
| 9 | What is the SI unit of viscosity. |
<p>Pascal</p> <p>kg m-1 s-1</p> <p>Joule</p> <p>Nm-2</p> |
| 10 | Surface tension usually with interasig temperature. |
<p>Increase</p> <p>Decrease</p> <p>Remain constant</p> <p>Doubles</p> |
| 11 | What causes surace tension in liquids . |
<p>Gravity</p> <p>Air Pressure</p> <p>Intermolecular force between surface molecules</p> <p>Temperatur edifference</p> |
| 12 | Which of the following contribtes to water's high viscosity |
<p>Covalet bonds</p> <p>Metallic interactions</p> <p>Strong hydrogen bonding</p> <p>Low surface area</p> |
| 13 | Why is water's surface tension so high. |
<p>Due to its ioic nature</p> <p>Because of hydrogen boding pulling surface molecules downward</p> <p>Beacue it has low boiling point</p> <p>Beacuse water molecules are very large</p> |
| 14 | What is the value of water's enthalpy of vaporization. |
<p>21 kJ/mol</p> <p>41 kJ /mol</p> <p>30 kJ /mol</p> <p>60 kJ /mol</p> |
| 15 | What property of wate allows quals life to survive under frozen surface |
<p>High surface tension</p> <p>High heat capacity</p> <p>Ice floats and insulates water before</p> <p>Low boiling point</p> |
| 16 | What type of structue do water molecule sform in ice. |
<p>Linear</p> <p>Hexagonal close packed</p> <p>Regualr tetrahedral</p> <p>Irregualr amorphous</p> |
| 17 | Why does ice float on water. |
<p>It has lower density than water</p> <p>It is heavier than water</p> <p>It forms ionic bonds</p> <p>It denser than water</p> |
