MCQs on Environmental Issues- 16

1. The band labelled as UV-C which is lethal to micro-organisms is

(A) mm 0.29 – 0.32
(B) mm 0.2 – 0.29
(C) mm 0.17 – 0.2
(D) mm 0.07 – 0.21



2. Which of the following species in the atmosphere is called atmospheric detergent?

(A) Chlorine radical
(B) Hydroxyl radical
(C) Methyl radical
(D) Ozone radical



3. The POH of a 0.001 M solution of HCl is

(A) 12
(B) 10
(C) 11
(D) 13



4. Assertion (A): Solar photovoltaic cells are expensive.
Reason (R): Solar photovoltaic cells are fabricated from crystalline silicon and operate only at 10-12% efficiency.
Identify the correct answer:

Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A).
(C) (A) is true but (R) is false.
(D) (A) is false but (R) is true.


5. Which one of the following techniques can be used for determining the level of cadmium in soil?

(A) UV – Visible spectrophotometer
(B) Atomic Absorption Spectrophotometer
(C) XRD
(D) IR spectrometer


6. For noise control in automobiles, the exhaust muffler attenuates sound by

(A) Absorption
(B) Destructive interference
(C) Reducing velocity of hot gases
(D) Absorption and destructive interference



7. Which one of the following is a peroxyl radical?

(A) OH0
(B) R0
(C) RO0
(D) ROO0


8. The sequence of fossil fuels in the order of higher to lower heating value is as follows:

(A) Coal, Petroleum, Natural Gas, Hydrogen.
(B) Hydrogen, Natural Gas, Petroleum, Coal.
(C) Hydrogen, Coal, Natural Gas, Petroleum.
(D) Natural Gas, Petroleum, Coal, Hydrogen.



9. Two sounds of 80 dB and 85 Db superimpose at a location. What is the resultant sound at that location?

(A) ~ 82 dB
(B) ~ 87 dB
(C) ~ 91 dB
(D) ~ 165 dB



10. The coefficient of performance of a wind turbine for maximum power output is 

(A) 13/18
(B) 5/8
(C) 16/27
(D) 11/17


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