4161: Mixed cropping is useful when:
(a) Crops with varying maturity periods are sown together
(b) Crops with same maturity period are sown together
(c) Different soils are used for the same crops
(d) Crops with different nutritional requirements are grown
4162: Graphene is frequently in news recently. What is its importance?
1. It is a two-dimensional material and has good electrical conductivity.
2. It is one of the thinnest but strongest materials tested so far.
3. It is entirely made of silicon and has high optical transparency.
4. It can be used as 'conducting electrodes' required for touch screens, LCDs and organic LEDs.
Which of the statements given above are correct?
(a) 1 and 2 only
(b) 3 and 4 only
(c) 1, 2 and 4 only
(d) 1, 2, 3 and 4
4163: Which one of the following statements is correct ?
(a) Kacchativu and Tin Bigha were territories acquired by the Indian Republic from the French
(b) Kacchativu and Tin Bigha are territories handed over to Sri Lankan and Bangladeshi sovereignty respectively by the Government of India
(c) Kacchativu and Tin Bigha are areas that were annexed by the Chinese in the 1962 Sino-Indian War
(d) Kacchativu and Tin Bigha are enclaves which were transferred to India by lease arrangements with Sri Lanka and Pakistan respectively
4164: What is the principle by which a cooling system (Radiator) in a motor car works ?
(a) Convection
(b) Conduction only
(c) Both conduction and radiation
(d) Radiation only
4165: Wangari Maathai, the Nobel Prizes winner from Kenya is known for her contribution to which one of the following ?
(a) Child development
(b) Journalism
(c) Sustainable development
(d) International economics