Questions

By definition a clade is

Filed Under: General Science
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The substances which reduce friction are called _________.

Filed Under: Physics
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Which type of soil is capable of holding moisture for release to plants during the dry period? Alluvial/Black/ Laterite/Red

Subject: World Geography

Which Governor General abolished the 'Sati System' in India?

Filed Under: Indian History
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What is Stack?

Subject: Hardware

What has roots that nobody sees, Is taller than trees, Up, up it goes, Yet it never grows?

Subject: Word Puzzles Exam Prep: GATE , CAT , Bank Exams , AIEEE
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Read the passage carefully and choose the best answer to each question out of the four alternatives and click the button corresponding to it.

Modern civilisation is completely dependent on energy, which has therefore to be abundant and also economical. About 85% of the world's energy is supplied by oil, coal and natural gas while nuclear, hydro, wind and solar power and biomass supply the rest. Coal, nuclear and hydro are used primarily to generate electricity while natural gas is widely used for heating. Biomass is used both for heating and cooking. The wind and solar power is the future's hope as they are sustainable energy sources. Oil powers almost all machines that move and that makes oil uniquely versatile. Oil powered airplanes carry 500 people across the widest oceans at nearly the speed of sound. Oil powered machines produce and transport food. Oil powered machines are ubiquitous. Clearly, we live in the age of oil but it is drawing to a close. According to data available if oil production remains constant until it's gone, there is enough to last 42 years. Oil wells will produce less as they become depleted, which will make it impossible to keep production constant. Similarly natural gas and coal will last another 61 years and 133 years respectively. Naturally, as they become scarce, they become expensive, leading to a worldwide energy crisis. If we are to survive on this planet, we have to make a transition to sustainable energy sources. The transition may be willy-nilly or planned - the choice is ours.

The dawning era of limited and expensive energy will be very difficult for everyone on earth but will be even more difficult if it is not anticipated. It is of utmost importance that the public and policymakers understand the global energy crisis and act in tandem to ensure that the species 'homo sapiens' does not become extinct.

The energy sources of the future are

Filed Under: English
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Radiocarbon dating technique is used to estimate the age of

Filed Under: Physics
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