Ozone saves the biosphere by absorbing high energy radiations called ________ .
A). Infra-red (IR)
B). Gamma rays
C). Ultraviolet rays (UV)
D). Xrays
Ultraviolet rays (UV)
The ozone layer or ozone shield is a region of Earth’s stratosphere that absorbs most of the Sun’s ultraviolet (UV) radiation. It absorbs 97 to 99 percent of the Sun’s medium-frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which otherwise would potentially damage exposed life forms near the surface.
1. The material known in commerce as Terylene is a
2. The main constituent of biogas is
3. Which variety of coal contains recognisable traces of the original plant material ?
4. The melting point of ice is ____ K.
5. Question 14.15:What are pesticides and herbicides? Explain giving examples.
6. The polymerisation of which of the following is used in manufacturing of polythene in industry ?
7. Sodium Carbonate is commonly known as
8. The anode in a dry cell consists of