The current recommended limit of arsenic in drinking water by World Health Organization is: 10 µg/L 100 µg/L 200 µg/L None of these
Greenhouse gases absorb the: Infrared radiation Ultraviolet radiation Visible radiation None of these
In which atmosphere layer the temperature is about -90°C? Mesosphere Troposphere Thermosphere Stratosphere
Electromagnetic radiation is higher energy than visible radiation in: Infrared rays Microwave rays X-rays None of these
