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Regular intake of fresh fruits and vegetables is recommended in the diet since they are a good source of antioxidants. How do antioxidants help a person maintain health and promote longevity?[UPSC 2011 (CS-P)]

They activate the enzymes necessary for vitamin synthesis in the body and help prevent vitamin deficiency
They prevent excessive oxidation of carbohydrates, fats and proteins in the body and help avoid unnecessary wastage of energy
They neutralize the free radicals produced in the body during metabolism
They activate certain genes in the cells of the body and help delay the ageing process

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UPSC Other Question
Radioactivity is measured by [UPSC 2008]

Geiger-Muller counter
Polarimeter
Calorimeter
Colorimeter 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: [UPSC 2011 (CS-P)]

1, 2 and 3 only
1, 3 and 4 only
2 and 4 only
1, 2, 3 and 4