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What Prevents Them From Reaching the Surface of the Earth?

Electrically charged particles from space travelling at speeds of several hundred km/sec can severely harm living beings if they reach the surface of the Earth. What prevents them from reaching the surface of the Earth?(2012) a) The Earth’s magnetic field diverts them towards its poles b) Ozone layer around the Earth reflects them back to […]

What Advantage Does Thorium Hold Over Uranium?

To meet its rapidly growing energy demand, some opine that India should pursue research and development on thorium as the future fuel of nuclear energy. In this context, what advantage does thorium hold over uranium? 1. Thorium is far more abundant in nature than uranium. 2. On the basis of per unit mass of mined […]

Recombinant DNA Technology (Genetic Engineering) Allows Genes To Be Transferred

Recombinant DNA technology (Genetic Engineering) allows genes to be transferred 1. across different species of plants 2. from animals to plants 3. from microorganisms to higher organisms Select the correct answer using the codes given below.(2013) a) 1 only b) 2 and 3 only c) 1 and 3 only d) 1, 2 and 3 Answer: […]

Graphene Is Frequently In The News Recently. What is its importance?

Graphene is frequently in the 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’ […]

What is the Difference Between Asteroids and Comets?

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 […]