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Rachel Carson's famous book "Silent Spri...

Rachel Carson's famous book "Silent Spring" is related to

A

Population explosion

B

Ecosystem Management

C

Pesticide pollution

D

Noise pollution

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The correct Answer is:
C
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An ideal spring is compressed and placed horizontally between a vertical fixed wall and a block free to slide over a smooth horizontal table to as shown in the figure. The system is released from rest. The graph which represents the relation between the magnitude of acceleration a of the block and the distance x travelled by it (as long as the spring is compressed) is

An ideal spring is compressed and placed horizontally between a vertical fixed wall and a block free to slide over a smooth horizontal table to as shown in the figure. The system is released from rest. The graph which represents the relation between the magnitude of acceleration a of the block and the distance x travelled by it (as long as the spring is compressed) is

Einstein's mass - energy relation emerging out of his famous theory of relativity relates mass (m) to energy (E ) as E = mc^2, where c is speed of light in vacuum. At the nuclear level, the magnitudes of energy are vary small. The energy at nuclear level is usually measured in MeV, where 1 MeV = 1.6 xx 10^(-13) J , the masses are measured in unified mass unit (u) where 1 u = 1.67xx10^(-27)kg. (a) Show that the energy equivalent of 1u is 931.5 MeV. (b) A student writes the relation as 1 u = 931.5 MeV. The teacher points out that the relation is dimensionally incorrect. Write the correct relation.

A body of mass m hung at one end of the spring executes simple harmonic motion . The force constant of a spring is k while its period of vibration is T . Prove by dimensional method that the equation T=2pisqrt(m//k) is correct. Dervive the correct equation , assuming that they are related by a power law.

A famous relation in physics relates the moving mass m to the rest mass m_(0) of a particle in terms of its speed v and the speed of light c .( This relation first arose as a consequence of the special theory of relativity due to Albert Einstein). A body recalls the relation almost correctly but forgets where to put the constant c . He writes m = (m_(0))/((1- V^(2))^(1//2)) . Guess where to put the missing c .

A block of mass m rests on a rough horizontal plane having coefficient of kinetic friction mu_(k) and coefficient of static friction mu_(s) . The spring is in its natural, when a constant force of magnitude P=(5mu_(k)mg)/(4) starts acting on the block. The spring force F is a function of extension x as F=kx^(2).( Where k is spring constant ) (a) Comment on the relation between mu_(s) and mu_(k) for the motion to start. (b) Find the maximum extension in the spring ( Assume the force P is sufficient make the block move ) .

AAKASH SERIES-ENVIRONMENTAL ISSUES-Exercise-III (Previous AIPMT/NEET Questions)
  1. Which of the following is not one of the prime health risk associated ...

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  2. High BOD indicates

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  3. Rachel Carson's famous book "Silent Spring" is related to

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  4. The zone of atmosphere in which the ozone layer is present is called

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  5. A scrubber in the exhaust of a chemical in dustrial plant removes

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  6. Kyoto Protocol was endosed at

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  7. A location with luxuriant growth of lichens on the trees indicates tha...

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  8. The Air Prevention and Control of Pollution Act came into force in

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  9. Global warming can be controlled by

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  10. In an area where DDT had been used extensively the population of bird...

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  11. Which one of the following is a wrong statement

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  12. Which one of the following pairs of gases are the major cause of "Gree...

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  13. Which one of the following statements is wrong in case of Bhopal Trag...

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  14. Eutrophication is often seen in

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  15. Secondary sewage treatment is mainly a:

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  16. "Good ozone" is found in the

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  17. Which of the following is mainly produced by the activity of anaerobic...

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  18. dB is a standard abbreviation used for the quantitative expression of

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  19. A renewable exhaustible natural resource is

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  20. Stirred - tank bioreactors have been designed for

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