Water Test

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Water Test - 1

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Weekly Quiz Competition

Question 1
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Which of the following are the forms of surface water?

(i) Streams
(ii) River water
(iii) Lakes
(iv) Springs

A
(i) and (ii)

B
(ii) and (iii)

C
(i), (ii) and (iv)

D
(i), (ii) and (iii)

Solution

Streams, rivers and lakes are forms of surface water and are fed mainly by the precipitation in the form of rain or snow.

Springs are formed where the groundwater emerges to the surface through areas where the crust is thin.

Hence, springs are fed by the underground aquifers.
Question 2
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________ is observed on the leaves of grass and plants on winter mornings.

A
Dew

B
Fog

C
Mist

D
Hail

Solution

Dew is the water vapour that condenses on cold winter mornings and appears as water drops on the surface of leaves and grass.
Question 3
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Consider the following statements:

(i) The liquid in which a substance dissolves is the solvent.
(ii) The substance which gets dissolved in a solvent is the solute.
(iii) On heating a saturated solution, the excess salt gets precipitated from the solution.
(iv) The resultant mixture obtained when no more solute can be dissolved in the solvent is called a saturated solution.

Which of the above statements is not correct?

A
(i)

B
(ii)

C
(iii)

D
(iv)

Solution

Statement (iii) is incorrect because on heating a saturated solution, it becomes unsaturated and would dissolve more solute. Hence, excess salt will get dissolved, rather than precipitated.
Question 4
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Which of the following actions will not help in prevention of water pollution?

A
Domestic sewage should be treated before releasing it into water sources.

B
Waste materials such as plastic bags and metal cans should not be disposed in water bodies.

C
Laws should be made to prevent water pollution.

D
Good quality of chemical fertilisers, insecticides and pesticides should be used.

Solution

The use of fertilisers, insecticides and pesticides of a good quality may improve the agricultural produce, but this will not prevent water pollution. Excess of these chemicals get washed into the water bodies and pollutes them.
Question 5
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In which of the following cases will evaporation of water be the fastest if equal quantity of water is taken in each of the cases?

A
Water kept in a tumbler in the sunlight

B
Water kept in a tray in the sunlight

C
Water kept in a tumbler in the shade

D
Water kept in a bowl in the sunlight

Solution

Rate of evaporation increases with increase in temperature.
Rate of evaporation increases with increase in the surface area exposed.
Hence, evaporation will be fastest when water is poured in a tray and kept in the sunlight.
Question 6
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Which of the following statements is/are false?

a. Red worms used for vermicomposting grind their food with their teeth.
b. Vermicompost contains a large amount of castings, which are, the material that passses through the gut of the worms.
c. Compost does not pollute the environment.

A
Only a

B
Only a and b

C
Only b

D
Only b and c

Solution

The statement 'a' is incorrect.

Red worms don't have teeth and as a result they have little ability to grind their food. During vermicomposting small grains of sand and mineral particles are mixed with food.
In the gizzard these particles are compressed by the action of the gizzard muscle, which grinds food into smaller particles.
Question 7
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Which of the following is a renewable resource?

A
Solar power

B
Coal

C
Natural gas

D
Petroleum

Solution

Renewable energy is generally defined as the energy that comes from resources which are naturally replenished. Sunlight is a renewable resource and does not get exhausted by use. Hence, option (1) is the correct answer.

Coal, petroleum and natural gas are fossil fuels and are non-renewable resources.

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Re-Attempt Weekly Quiz Competition

Water Test - 1

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Water Test - 1

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SHARING IS CARING

Question 1

(i) and (ii)

(ii) and (iii)

(i), (ii) and (iv)

(i), (ii) and (iii)

Solution

Question 2

Dew

Fog

Mist

Hail

Solution

Question 3

(i)

(ii)

(iii)

(iv)

Solution

Question 4

Domestic sewage should be treated before releasing it into water sources.

Waste materials such as plastic bags and metal cans should not be disposed in water bodies.

Laws should be made to prevent water pollution.

Good quality of chemical fertilisers, insecticides and pesticides should be used.

Solution

Question 5

Water kept in a tumbler in the sunlight

Water kept in a tray in the sunlight

Water kept in a tumbler in the shade

Water kept in a bowl in the sunlight

Solution

Question 6

Only a

Only a and b

Only b

Only b and c

Solution

Question 7

Solar power

Coal

Natural gas

Petroleum

Solution

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