(iii) Isotropic
(iv) Short range order

A:-Only (i) and (iv)

B:-Only (ii) and (iii)

C:-Only (ii) and (iv)

D:-Only (iii) and (iv)

Correct Answer:- Option-D
Question21:-Rain water is called acid rain when its pH is

A:-Below 5.6

B:-Above 5.6

C:-Is above 5.6 but less than 7

D:-Always 7

Correct Answer:- Option-A

Question22:-Carbon monoxide is one of the serious air pollutant. Then which option
is wrong?

A:-Carbon monoxide binds with haemoglobin
B:-Oxygen carrying capacity of blood decreases

C:-It results in headache and cardio vascular disorder
D:-Oxygen carrying capacity of blood increases
Correct Answer:- Option-D

Question23:-Match the items given in column | with those in column II and select
the correct option given below :

Column | Column II
1. Mercury a. Itai-itai
2. Cadmium b. Methemoglobinemia
3. nitrate c. Mina matha disease
A:-1-a, 2-b, 3-c
B:-1-c, 2-a, 3-b
C:-1-a, 2-c, 3-b
D:-1-b, 2-c, 3-a

Correct Answer:- Option-B
Question24:-Which of the following is not a harmful effect of ozone layer depletion?
A:-Decreases moisture content of soil
B:-Increases evaporation of surface water
C:-UV radiation cannot enter into troposphere
D:-Causes mutation to cells
Correct Answer:- Option-C

Question25:-DDT is a non degradable pollutant and is chemically