Water

Q.

Which of the following is the main source of carbon monoxide (CO)?

1. Fungicides

2. Pesticides

3. Household wastes

4. Automobiles

Q.

Question 1
What are the different ways in which water gets contaminated?

Q. Oxygen has maximum solubility in water at which of the following temperatures in degree Celsius?

1. 80
2. 50
3. 42
4. 25

Q.

Arrange the following in decreasing percentage of freshwater contained in them:
Groundwater, Glaciers, Rivers, Atmosphere

1. Groundwater, Glaciers, Rivers, Atmosphere

2. Atmosphere, Groundwater, Glaciers, Rivers

3. Glaciers, Rivers, Groundwater, Atmosphere

4. Rivers, Groundwater, Atmosphere, Glaciers

Q.

Water on Earth's surface can be divided as ___ percent of fresh water and ___ percent of saline water.

1. 97, 3

2. 71, 29

3. 2.5 to 2.75, 97

4. 50, 50

Q. The amount of usable water on earth is:

1. Salt and water
2. Salt and carbon dioxide gas
3. Salt and nitrogen oxide
4. Salt and nitrogen gas

Q. The common thing about almost all of the earlier civilisations is that they all were settled near

1. a desert
2. a river
3. a mountain
4. a forest

Q. Match the following:
Water sources Presence of water
a)Soil moisture i) On Earth's surface
b)Seas ii) Above Earth's surface
c)Water vapours iii) Below Earth's surface

1. a-i, b-ii, c-iii
2. a-ii, b-i, c-iii
3. a-iii, b-ii, c-i
4. a-iii, b-i, c-ii

Q.
In the above diagram, X and Y are:

1. X = Hydrogen gas; Y = Zinc metal
2. X = Hydrogen gas; Y = Charcoal
3. X = Carbon dioxide gas; Y = Zinc meta
4. X = Chlorine gas; Y = Zinc metal

Q. What is the moisture present in atmosphere chemically composed of?

1. $H_{2}O$
2. $C{O}_2$
3. $O_2$
4. $N_2$

Q. A solid gets converted to liquid by releasing heat to its surroundings.

1. False
2. True

Q.

The amount of usable water on earth is limited.

1. True
2. False

Q. A solid gets converted to liquid by releasing heat to its surroundings.

1. False
2. True