9th Class Chemistry 4th Quarter Book Paper

Q1. Multiple choice questions (Attempt all · 12 × 1 = 12)

1. Which substance would have a higher rate of evaporation?
   1. water at 10 ºC
   2. water at 20 ºC
   3. water at 5 ºC
   4. water at 30 ºC
2. Which gas turns lime water milky?
   1. ammonia
   2. carbon dioxide
   3. oxygen gas
   4. sulphur dioxide gas
3. Standard form of 38000000000 is:
   1. 3.8×10⁸
   2. 3.8×10⁹
   3. 3.8×10¹²
   4. 3.8×10¹⁰
4. What happens to a liquid in an enclosed space during evaporation until saturation in reached:
   1. it solidifies
   2. it remains constant
   3. it evaporates completely
   4. it continues to vaporize
5. Which gas turns starch iodide paper blue-black?
   1. ammonia
   2. carbon dioxide
   3. chlorine gas
   4. oxygen gas
6. 1 kilometer means:
   1. 100 m
   2. 1000 cm
   3. 1000 cm
   4. 1000 m
7. Which process involves the formation of stalagmites and stalactities in cave?
   1. filtration
   2. crystallization
   3. distillation
   4. evaporation
8. Electrons of alkali metals excite by absorbing the light in:
   1. Visible wavelength
   2. UV wavelength
   3. IR wavelength
   4. Radio wavelength
9. Volume of liquid in cylinder is:
   1. 23
   2. 24
   3. 25
   4. 22
10. What determine the formation of crystals during crystallization?
    1. temperature and pressure
    2. size of the container
    3. type os solvent used
    4. color of the solute
11. Which gas has a pungent smell similar to bleach?
    1. ammonia
    2. carbon dioxide
    3. chlorine gas
    4. hydrogen gas
12. SI unit of mass is:
    1. kilogram
    2. centimetre
    3. kelvin
    4. millimetre