General Science-49

1. If the spinning speed of the earth is increased then the weight of body at equator
a. Increases
b. Decreases
c. Doubles
d. does not change

2. The mirror used by a dentist to examine the teeth of patients is :
a. Concave
b. Convex
c. Plane
d. Cylindrical

3. Wireless communication is reflected to earth’s surface by:
a. Troposphere
b. Stratosphere
c. Ionosphere
d. Exosphere

4. Sound above what level is considered hazardous noise pollution?
a. 30 dB
b. 40 dB
c. 60 dB
d. 80 dB

5. What type of electromagnetic radiation is used in the remote control of a television?
a. Infrared
b. Ultra-violet
c. Visible
d. None of these

6. The radiation that is absorbed by ozone present in the atmosphere is:
a. Infrared
b. Visible
c. Ultraviolet
d. Microwave

7. Which of the following gases is used for the purification of drinking water?
a. Sulphur dioxide
b. Chlorine
c. Fluorine
d. Carbon dioxide

8. The group of stars arranged in a definite pattern is called:
a. Milky way
b. Constellation
c. Andromeda
d. Solar System

9. Refrigeration helps in food preservation by:
a. Killing the germs/bacteria
b. Reducing the rate of biochemical reaction
c. Destroying the enzyme action
d. Sealing food with a layer of ice

10. When the light is passed through a prism, the color which deviates least is
a. Red
b. Green
c. Violet
d. Blue