Question 1 What is Ganga Action Plan?When and why was it launched? Question 2 Name the pollutants which cause water pollution? Question 3 What is water pollution? Question 4 State few ways of controlling water pollution? Question 5 How do industries cause water pollution? Question 6 Why even clear, transparent and odourless water may not be safe for … [Read more...] about Water Pollution
Class 8
Acid Rain and Green house effect
Question 1 What is green house effect? State its importance for us? Question 2 Name few greenhouse gases? Question 3 What depletes the ozone layer in the atmosphere? Question 4 What are the harmful effects of the depletion of ozone layer? Question 5 Describe the threat to Taj Mahal monument due to air pollution? Question 6 What is acid rain?How is acid rain … [Read more...] about Acid Rain and Green house effect
Air Pollution
Question 1 What is air pollution?What are the main sources of air pollution? Question 2 What is smog?How is smog formed?What are the harmful effects? Question 3 Name the various constituents of air? Question 4 How can you reduce air pollution at individual level? Question 5 Name few sources and harmful effects of Sulphur dioxide? Question 6 Name few sources and … [Read more...] about Air Pollution
Asteroids, Comets and Meteoroids
Question 1 What are asteroids? Where are they located? Question 2 What is a comet? Question 3 When does a comet become visible to us? Question 4 What happens to the tail of comet when it moves far away from the Sun? Question 5 What is a meteor? Question 6 What is the difference between a star and a shooting star? Question 7 What are meteorites? Asteroids A … [Read more...] about Asteroids, Comets and Meteoroids
Satellites and Artificial Satellite
Question 1 What is meant by the phases of the Moon? What causes the phases of the moon? Question 2 What is the difference between full moon and a new moon? Question 3 What is a satellite? Name the natural satellite of the Earth? Question 4 Moon does not have light of its own?How are we able to see the moon? Question 5 State two differences between artificial and … [Read more...] about Satellites and Artificial Satellite
The Solar System
Question 1 What is a Solar system? Name the different celestial objects which are members of the Solar system? Question 2 What are planets?How many planets are there in a Solar system? Question 3 Name all the planets of Solar system? Question 4 What are inner and outer planets? Name them? Question 5 How can you distinguish between planets and stars at … [Read more...] about The Solar System
Constellations
Question 1 What is a constellation? Name few constellations? Question 2 Name the constellation which appear to have the shape of a big bear, a distorted W or M, a hunter or a big lion? Question 3 What is the number of prominent stars in Ursa Major constellation?Draw a diagram to show the position of main stars in it? Question 4 What is the number of prominent stars in … [Read more...] about Constellations
Stars
Question 1 What is meant by celestial objects? Name few celestial objects? Question 2 What is a star? Name the star nearest to the Earth? Question 3 Why does pole star appear to be stationary in the sky? Question 4 How much time does light takes to reach Earth from the Sun? Question 5 Define the term light year? Question 6 Why do stars twinkle at night whereas … [Read more...] about Stars
Human Eye
Question 1 What is night blindness? What causes night blindness? Question 2 How does eye adjust itself to deal with light of varying intensity? Question 3 Why we cannot see our surrounding clearly when we enter a darkened cinema hall from bright sunshine but our vision improves after some time? Question 4 How does the eye lens differ form the ordinary convex lens made … [Read more...] about Human Eye
Formation of Image, Periscope, Kaleidoscope
Question 1 State few characteristics of image formed by a plane mirror? Question 2 What is a periscope? Question 3 State the various uses of periscope? Question 4 Explain how a hair dresser makes you see hair at the back of your head after the hair cut is complete? Question 5 How many images of an object will be formed when the object is placed two plane mirrors … [Read more...] about Formation of Image, Periscope, Kaleidoscope