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- 1. Multiple Choice
1. What is Winnowing ?
A method used to separate the components of a mixture which are different sizes substances.
The practice of separating undesirable solid substances and impurities from useful solids by hand.
A method used to separate lighter components of a mixture from the heavier ones by wind or by blowing air.
- 2. Multiple Choice
2. What means to cut the crop from the field?
Threshing
Winnowing
Harvesting
Sieving
- 3. Multiple Choice
3.How do we separate grains from stalks?
Sieving
Threshing
Winnowing
Handpicking
- 4. Multiple Choice
4.When do we mostly use handpicking?
When we separate stones from rice
When we separate water from sand
When we separate sugar from water
ALL of the above
- 5. Multiple Choice
5.A solution in which no more solute can be added is called
True Solution
Unsaturated solution
Saturated solution
Mixture
- 6. Multiple Choice
6. The density of water is 1g/cc. Mercury is denser and kerosene is less dense than water. None of the liquids mix with each other. What will a jar that has 20 ml of water, 10 ml of mercury and 30 ml of kerosene look like?
A
B
C
D
- 7. Multiple Choice
7. State whether true /false.
Oil layers in the oceans blocks the air from entering the water and affects aquatic life.
True
False
- 8. Multiple Choice
8. State whether true /false.
Immiscible liquids form different layers due to the difference in density of the liquids.
True
False
- 9. Multiple Choice
State true or false
9.The solubility of gases in water increases with increase in temperature.
True
False
- 10. Multiple Choice
10. A student measures 5 grams of sugar into 50 milliliters of water in a flask.
Which of the following should the student do to help the sugar dissolve more quickly into the water?
place the flask in a refrigerator.
place a stopper in the top of the flask
add more water to the mixture
gently swirl the mixture in the flask
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