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Chemistry Fsc Part 1 Online Test
| Sr. # | Questions | Answers Choice |
|---|---|---|
| 1 | Liquid crystals exhibit properties of |
<p>Only solid</p> <p>Only liquid</p> <p>Both solids and liquids</p> <p>Gases and solids</p> |
| 2 | What typ of molecular shape in communly found in liquid crystals. |
<p>Spherical</p> <p>Rod like and elongated</p> <p>Spiral</p> <p>Cubic</p> |
| 3 | Which of the followign best describes the molecular arrangemetn in liquid crystals. |
<p>Random and disordered</p> <p>Fixed in all direcions</p> <p>Parallel and partically ordered</p> <p>Compleely rigid and fixed</p> |
| 4 | What happens to the shae of a NaCl crystal when 10% urea is present in its solution. |
<p>It becomes needle like</p> <p>It becomes larger</p> <p>It reamains the same</p> <p>It becomes cubic</p> |
| 5 | Which of the following materials is an example of an amorphous solid |
<p>Glass </p> <p>Ice</p> <p>Diamon</p> <p>Sodium Chaloride</p> |
| 6 | amorphous solids are typically |
<p>Rigid and hard</p> <p>Found in lump or fine powder form</p> <p>Have a shrp melting point</p> <p>Always crystalline in structure</p> |
| 7 | The shape in which a crystal usually grows is called its. |
<p>Habit</p> <p>Crystal lattice</p> <p>Melting Point</p> <p>Cleavage plane</p> |
| 8 | When a crystalline solid is broken, it does so along specific planes, Theseplanes are kown as. |
<p>Cleavage planes</p> <p>Crystal faces</p> <p>Surface planes</p> <p>Growth planes</p> |
| 9 | Which of the following is a charcteristic of cyrstalline solids. |
<p>They do not have a definite geometrical shape</p> <p>They melt over a wide temerature range</p> <p>They have asharp melting point</p> <p>Their properties do not depend on the directionof measurement</p> |
| 10 | In Solids the particles miainly have which type of motion |
<p>Translatory motion </p> <p>Vibratory motion</p> <p>Rotatray motion </p> <p>Random Motion </p> |
| 11 | What happens to the particles in a solid when the temperature increases. |
<p>They move closer to each other</p> <p>Their vibrational motion increases</p> <p>They start moving freely</p> <p>The solid melts</p> |
| 12 | Why is the compression of solids not possible |
<p>The particles are fixed in place and cannot move closer</p> <p>Their particles are widely spaced</p> <p>The partiles are charged</p> <p>Solids are made of gases</p> |
| 13 | How does heat of vaporization affect matter. |
<p>Cause decrease in kinetic energy</p> <p>Incresses particle motion and separes tham into gas phase</p> <p>Decresease freedom of particles</p> <p>Strengthens intermolecular forces</p> |
| 14 | Which of the followng has the lowest molar hat of vaporization. |
<p>HCl</p> <p>Water</p> <p>NH3</p> <p>Ethanol</p> |
| 15 | What is the role of a pressur ecooker in boiling water. |
<p>It lowers atmospheric pressure</p> <p>It allows water to evaporate quickly</p> <p>It increases external pressure raising boiling point</p> <p>It cools the steam</p> |
| 16 | Why does water boil at 69 oC on Mount Everest |
<p>Due to hgih temperature</p> <p>Due to low vapour pressure</p> <p>Due to low external pressure</p> <p>Due to presence of snow</p> |
| 17 | What is the effect of decresing external pressur eon boiling point of a liquid. |
<p>It increases</p> <p>It remains constant</p> <p>It decrease</p> <p>It fluctuates</p> |
