ECAT Pre Engineering Chemistry Chapter 27 MCQ Test With Answer

MCQ's Test For ECAT Chemistry Chapter 27 Environmental Chemistry

Try The MCQ's Test For ECAT Chemistry Chapter 27 Environmental Chemistry

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ECAT Chemistry Chapter 27 Environmental Chemistry

00:00
Question # 1

CFCs destroy ozone layer. How many ozone molecule a chlorine free radical can destroy

Question # 2

Swage water is purified by

Question # 3

B.O.D is connected with

Question # 4

Chromium (VI) is highly toxic and can cause

Question # 5

The % of CO2is the atmosphere is

Question # 6

Water is often treated with chlorine to

Question # 7

Acid rains are produced by

Question # 8

The 95.5% mass of Lithosphone is made of 11 elements i.e. O2, Si, Al, Fe, Ca, Na, K, Mg, Ti, H2and P. which element is present in trace amount

Question # 9

Drained sewage has B.O.D

Question # 10

Eutrophication causes reduction in

Question # 11

Industrial effuents have toxic synthetic organic compounds as well as heavy metals like

Question # 12

Which step is unnecessary for purification of water for drinking purposes

Question # 13

Chromium (VI) is highly toxic and can cause

Question # 14

To purify water which has mud dissolved in it, A substance which coagulates the suspended particles is used. The coagulant may be

Question # 15

As it passes into food chain, the concentration of DDT

Question # 16

Which is not a component of environment

Question # 17

Increasing skin cancer and high mutation rate are due to

Question # 18

Which one is the most toxic?

Question # 19

DDT is

Question # 20

Value of chemical oxygen demand (COD) is a measure of chemically oxidizable matter in water. Which value of COD will indicate more polluted water

Question # 21

When chlorofluoro carbon are subjected to U.V. they form

Question # 22

Environmental pollution affects

Question # 23

Ultraviolet radiation from sun causes a reaction that produces

Question # 24

Acid rain is caused when various atmospheric gases dissolve in rain water. What are the gases that cause rain water

Question # 25

The pH of the rain water in areas where acid rain is the cause of pollution may be

Question # 26

Chief source of water and soil pollution is

Question # 27

Biodegradable pollutant is

Question # 28

In the atmosphere, O2is about

Question # 29

Water pollution is mainly due to

Question # 30

Which of the following is responsible for depletion of the ozone layer in the upper strata of the atmosphere?

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ECAT Chemistry Chapter 27 Important MCQ's

Sr.# Question Answer
1 Water is often treated with chlorine to
A. Increase oxygen content
B. Kill germs
C. Remove hardness
D. Remove suspended particles
2 Contamination of Hg comes into surface water from chlor industrial wastes. Why is Hg toxic
A. It attaches to sulphur of the disulphide link
B. Hg is a heavy metal
C. Hg is liquid at room temperature
D. Hg is non reactive chemically
3 The % of CO2is the atmosphere is
A. 3.0%
B. 0.03%
C. 0.3%
D. 0.5%
4 The pH range of the acid rain is
A. 8 - 7
B. 7 - 6.5
C. 6.5 - 6
D. Less than 5
5 SO2Makes ______ acid rains
A. Carbonic acid
B. Sulfuric
C. Nitric acid
D. All of these
6 Ozone depletion in stratosphere shall result in
A. Forest fires
B. Increased incidence of skin cancer
C. Global warming
D. None of the above
7 Ecosystem is a smaller unit of
A. Hydrosphere
B. Lithosphere
C. Biosphere
D. Atmosphere
8 Which is not a component of environment
A. Biosphere
B. Lithospahre
C. Hydrosphere
D. None of these
9 BOD is
A. Biological oxygen deficit
B. Biosphere oxygen demand
C. Biological oxygen demand
D. None of the above
10 Chromium (VI) is highly toxic and can cause
A. Blindness
B. Cancer
C. Liver problems
D. Blood problems

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