Which of the following statements with regard to the famous 'silk routes' are correct?

1. Silk routes refer to East-bound European silk cargoes along these routes.

2. There were several silk routes, over land and by sea, joining together vast regions of Asia with Europe and northern Africa.

3. They are known to have existed since before the Christian Era and thrived almost till the fifteenth century.

4. Besides silk, Chinese pottery, textiles and spices from India and South-east Asia travelled the same route.

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Consider the following statements about Ajanta paintings :

1. The surface of the rock was coated with clay mixed with rice husk and gum and a coat of lime was applied over this.

2. The outline drawing was done first on the lime coating and colours were added subsequently.

Which of the statements given above is/are correct?

Which of the following statements with regard to the Square Kilometre Array (SKA) project is/are correct?

1. SKA is a state-of-the-art, mega science international facility to build the world's biggest and most sensitive radio telescope for addressing a wide variety of cutting-edge science goals.

2. The Government of India has accorded its approval for India's participation in the international mega science project.

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Exercise Desert Cyclone is a joint military exercise between India and :