MDCAT Chemistry Chapter 21 online mcq test with answers for chapter 21 (Environmental Chemistry)

MDCAT Chemistry Chapter 21 Environmental Chemistry Online Test

Sr. #

Questions

Answers Choice

1

Which one of the pollutants of automobile exhausts affects the nervous system or produces mental diseases

NO<sub>2</sub> SO<sub>2</sub> Hg Pb

2

Which one of the following does not act as pollutant

Carbon monoxide Sulphur dioxide Hydrocarbons Carbon dioxide

3

Biochemical oxygen demand (BOD) is the capacity of organic matter in natural water to consume oxygen with in a period of

2 day 6 day 5 day 7 day

4

The main pollution of leather tanneries in the waste is due to the salt of

Chromium Copper Chromium Lead

5

Potable water is considered to be

Safe for human consumption The ground water The surface water Now safe for human consumption

6

Major cause of SO2 on global scale is

<span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">Volcanoes</span> <span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">Electric sparks</span> <span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">Combustion</span> <span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">All</span>

7

Residence time of methane in the atmosphere is

<span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">3 - 7 days</span> <span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">2 -3 days</span> <span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">3 - 7 years</span> <span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">2 - 3 years</span>

8

Which of the following is not a secondary pollutant

<span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">Ozone</span> <span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">Carbonic acid</span> <span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">Sulphuric acid</span> <span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">Carbon dioxide</span>

9

Three elements needed for the healthy growth of plants are

<span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">N P K</span> <span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">N K C</span> <span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">N S P</span> <span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">N Ca P</span>

10

Requirement of macronutrient per acre of the land is

<span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">5 to 200 kg</span> <span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">20-200 kg</span> <span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">200-400 kg</span> <span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">30-400 kg</span>

11

Which of the following is a macronutrient?

<span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">Boron</span> <span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">Iron</span> <span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">Copper</span> <span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">Carbon</span>

12

Which of the following is not a heavy industry?

<span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">Iron</span> <span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">Fertilize</span> <span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">Paper</span> <span style="color: rgb(0, 0, 0); font-family: Verdana, Tahoma; font-size: 12px;">None</span>

13

Water exist in only

<span style="font-size: 0.95em;">One state</span> <span style="font-size: 0.95em;">Two state</span> Three states <span style="font-size: 0.95em;">4 states</span>

14

Hard water can block radiators due to formation of

<span style="font-size: 0.95em;">Insoluble calcium and magnesium salts</span> <span style="font-size: 0.95em;">Insoluble sodium salts</span> <span style="font-size: 0.95em;">In soluble phosphate salts</span> <span style="font-size: 0.95em;">Insoluble potassium salts</span>

15

Addition of washing soda removes

<span style="font-size: 0.95em;">Softness of water</span> <span style="color: rgb(0, 0, 0); font-size: 0.95em;">Temporary hardness of water</span><br> <span style="font-size: 0.95em;">Permanent hardness of water</span> <span style="font-size: 0.95em;">Hydrogen from water</span>

16

Temporary hardness can be removed by adding

<span style="font-size: 0.95em;">Lime</span> <span style="font-size: 0.95em;">Carbon</span> <span style="font-size: 0.95em;">Oxygen</span> <span style="font-size: 0.95em;">Slaked lime</span>

17

Hardness which can be removed by boiling is called

<span style="font-size: 0.95em;">Permanent hardness</span> <span style="font-size: 0.95em;">Temporary hardness</span> <span style="font-size: 0.95em;">Stiffness</span> <span style="font-size: 0.95em;">Toughness</span>

18

Natural water is

<span style="font-size: 0.95em;">Pure</span> <span style="font-size: 0.95em;">Impure</span> <span style="font-size: 0.95em;">Acts as solute</span> Distilled

19

Ratio of hydrogen (H) and oxygen (O) in water molecule by volume is

<span style="font-size: 0.95em;">2: 1</span> <span style="font-size: 0.95em;">1: 2</span> <span style="font-size: 0.95em;">3: 1</span> <span style="font-size: 0.95em;">4: 1</span>

20

Property due to which water acts as a universal solvent is

<span style="font-size: 0.95em;">Polarity</span> <span style="font-size: 0.95em;">It's ability to make hydrogen bond</span> <span style="font-size: 0.95em;">Both A and B</span> <span style="font-size: 0.95em;">Strong dipole dipole interaction</span>

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