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The function of heavy water in a nuclear reactor is to 

A genetically engineered form of brinjal, known as the Bt-brinjal has been developed. The objective of this is 

What is the difference between asteroids and comets ?
1. Asteroids are small rocky planetoids,while comets are formed of frozen gases held together by rocky and metallic material.
2. Asteroids are found mostly between the orbits of Jupiter and Mars,while comets are found mostly between Venus and Mercury.
3. Comets show a perceptible glowing tail,while asteroids do not.
Which of the statements given above is/are correct ? 

An artificial satellite orbiting around the Earth does not fall down. This is so because the attraction of Earth 

Satellites used for telecommunication relay are kept in a geostationary orbit. A satellite is said to be in such an orbit when:
1. The orbit is geosynchronous.
2. The orbit is circular,
3. The orbit lies in the plane of the Earth's equator.
4. The orbit is at an altitude of 22,236 km.
Select the correct answer using the codes given below