Pollution:
1. Any undesirable change in physical characteristics of air, land water and soil
2. Any undesirable change in biological characteristics of air, land water and soil
3. Any undesirable change in physical, chemical and biological characteristics of air, land water and soil
4. Any undesirable change in physical and chemical characteristics of air, land water and soil

Agents that bring undesirable change in biological, physical and chemical environment is called

Environment Protection Act protects and improves the quality of

Match each item in Column I with one item in Column II and chose your answer from the codes given below:
Column I                                      Column II
I. Environment Act                        1. 1986
II. Montreal protocol                      2. 1987
III. Earth summit                           3. 1992
IV. Kyoto protocol                          4. 1997
Codes:
I II III IV
A. 1 2 3 4
B. 2 1 4 3
C. 2 1 3 4
D. 1 2 4 3

Which of the following is a secondary pollutant?

$1.$ $\mathrm{CO}$

$2.$ ${\mathrm{CO}}_2$

$3.$ ${\mathrm{SO}}_2$

$4.$ ${\mathrm{O}}_3$

Match correctly the following and choose the correct option

(i) Environment Protection Act                                A. 1974

(ii) Air Prevention & Control of Pollution Act         B. 1987

(iii)Water Act                                                              C. 1986

(iv)Amendament of Air Act to include noise          D. 1981

The correct matches is;

1. i-C, ii-D, iii-A, iv-B

2. i-A, ii-C, iii-B, iv-D

3. i-D, ii-A, iii-B, iv-C

4. i-C, ii-D, iii-B, iv-A

Ultrasound of how much frequency is beamed into a human body for sonography?

1. 30-40 MHz

2. 15-30 MHz

3. 1-15 MHz

4. 45-70 MHz

The Environment [protection] Act to protect and improve the quality of our environment [Air, Water and Soil] was passed by the Government of India in: