Q. No.The green scum seen in the freshwater bodies is:
1. Blue-green algae
2. Red algae
3. Green algae
4. Both 1 and 3
1. Blue-green algae
2. Red algae
3. Green algae
4. Both 1 and 3
The loudness of a sound that a person can withstand without discomfort is about:
| 1. | 150 dB | 2. | 215 dB |
| 3. | 30 dB | 4. | 80 dB |
The major source of noise pollution in the world is:
1. Office equipment
2. Transport system
3. Sugar, textile, and paper industries
4. Oil refineries and thermal power plants
Match the following and choose the correct option.
| Column I | Column II | ||
| A. | Environment Protection Act | i. | 1974 |
| B. | Air prevention & Control of pollution Act | ii. | 1987 |
| C. | Water act | iii. | 1986 |
| D. | Amendment of Air Act to include noise as an air pollutant | iv. | 1981 |
The correct match is :
| Options: | A | B | C | D |
| 1. | iii | iv | i | ii |
| 2. | i | iii | ii | iv |
| 3. | iv | i | ii | iii |
| 4. | iii | iv | ii | i |
Catalytic converters are fitted into automobiles to reduce the emission of harmful gases. Catalytic converters change unburnt hydrocarbons into:
1. Carbon dioxide and water
2. Carbon monoxide
3. Methane
4. Carbon dioxide and methane
It is necessary to remove sulphur from petroleum products to
| 1. | reduce the emission of sulphur dioxide in exhaust fumes |
| 2. | increase efficiency of automobiles' engines |
| 3. | use sulphur removed from petroleum for commercial purposes |
| 4. | increase the life span of engine silencers |
Which one of the following impurities is easiest to remove from wastewater?
| 1. | Bacteria | 2. | Colloids |
| 3. | Dissolved solids | 4. | Suspended solids |
Which one of the following diseases is not caused due to contamination of water?
| 1. | Hepatitis-B | 2. | Jaundice |
| 3. | Cholera | 4. | Typhoid |
Nuisance growth of aquatic plants and bloom-forming algae in natural waters is generally due to high concentrations of:
| 1. | Carbon | 2. | Sulphur |
| 3. | Calcium | 4. | Phosphorus |
Algal blooms impart a distinct colour to water due to:
| 1. | Their pigments |
| 2. | Excretion of coloured substances |
| 3. | Formation of coloured chemicals in water facilitated by physiological degradation of algae |
| 4. | Absorption of light by algal cell wall |
© 2024 GoodEd Technologies Pvt. Ltd.