1. An example of water – borne disease is
_______.
a. scabies
b. dracunculiasis
c. trachoma
d. typhoid
Answer: d. Typhoid
2. The sedimented and floating materials
are removed by this treatment process.
a. primary treatment
b. secondary treatment
c. tertiary treatment
d. peripheral treatment
Answer: a. primary treatment
3. Which is a non – renewable resource?
a. coal
b. petroleum
c. natural gas
d. all the above
Answer: d. All the above
4. _______ is the chief component of
natural gas.
a. ethane
b. methane
c. propane
d. butane
Answer: b. methane
- Solutions
1. A true solution is a homogeneous mixture
of solute and solvent. Chalk powder in
water is a heterogenous mixture. Is it a
true solution?
Answer: No , it is a suspension
2. A solution that contains water as the
solvent is called an aqueous solution.
If carbon di sulphide is a solvent in a given solution, then the
solution is called ________.
a. aqueous solution
b. non – aqueous solution
Answer: b. non
- aqueous solution
3. The solubility that common salt in 100g
water is 36g . If 20g of salt is
dissolved in it. How much more is
required to attain saturation?
Answer: 16gram
4. If two liquids are mutually soluble, they
are called ________ liquids.
a. miscible
b. immiscible
Answer:
a. miscible
5. When Sunlight passes through the window of
a classroom, its path is visible. This is due to ________ of light.
a. reflection
b. scattering
Answer: b. scattering
6. The particles in various forms are visible
only under an ultra microscope. A
solution containing such particles is called ________.
a. True solution
b. colloidal solution
Answer: b. colloidal solution
7. The number of components in a binary
solution are / is ________.
a. one
b. two
Answer: b. two
8. The mixture of gases used by deep – sea
divers is ________.
a. Helium – Oxygen
b. Oxygen - Helium
Answer: a. Helium – Oxygen
9. Soil cannot store more nitrogen than it
can hold. Hence soil is said to be in a
state of ________.
a. saturation
b. unsaturation
Answer:
a. saturation
10. In an endothermic process, solubility
increases with ________ in temperature.
a. increase
b. decrease
Answer: a. increase
11. Aquatic species are more comfortable in
cold water because ________.
a. as the temperature decreases, the
solubility of dissolved oxygen increase.
b. as the temperature increases, the
solubility of dissolved oxygen increase.
c. as the temperature increases, the
solubility of dissolved oxygen decrease.
Answer: As the temperature decrease, the solubility
of dissolved oxygen increase.
0 Comments