Read the text carefully and answer the questions:
Radio waves are produced by the accelerated motion of charges in conducting wires. Microwaves are produced by special vacuum tubes. Infrared waves are produced by hot bodies and molecules also known as heat waves. UV rays are produced by special lamps and very hot bodies like Sun
a. Solar radiation is
1. transverse electromagnetic wave
2. longitudinal electromagnetic waves
3. both longitudinal and transverse electromagnetic waves
4. none of these.
b. What is the cause of greenhouse effect?
a) Ultraviolet rays
b) X-rays
c) Infrared rays
d) Radiowaves
c. Biological importance of ozone layer is
a) it stops ultraviolet rays
b) none of these.
c) it reflects radiowaves
d) It layer reduces greenhouse effect