Science-Tech

Sort Difficulty Level: Entry Level | Moderate | Difficult
What is the role of ultraviolet (UV) radiation in the water purification systems? 
1. It inactivates/kills the harmful micro-organisms in water. 
2. It removes all the undesirable odours from the water. 
3. It quickens the sedimentation of solid particles, removes turbidity and improves the clarity of water. 

Which of the statements given above is/are correct?
1 Only
yes
2 & 3 Only
no
1 & 3 Only
no
1, 2 & 3
no
Show Answer

The brightest planet is..........

Venus
yes
Mercury
no
Jupiter
no
Mars
no
Show Answer

Optical fibre works on the principle of.........

Refraction
no
Scattering
no
Interference
no
Total internal reflection
yes
Show Answer

Vitamin A is rich in.........

Carrot
yes
Lime
no
Beans
no
Rice
no
Show Answer
Carbon dating method is used to determine the age of.........
Rocks
no
Fossils
yes
Trees
no
Ancient monuments
no
Show Answer
18 carat gold signifies........
18 parts of gold and 82 parts of other metal
no
18 parts of gold and 6 parts of other metal
yes
82 parts of gold and 18 parts of other metal
no
None of the above
no
Show Answer