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Explanation: In many areas, Green Revolution is associated with the loss of soil fertility due to increased use of chemical fertilisers. Also, continuous use of groundwater for tube well irrigation has led to the depletion of the water-table. Environmental resources, like soil fertility and groundwater, are built up over years. Once destroyed it is very difficult to restore them. We must take care of the environment to ensure future development of agriculture.
Which physical quantity has unit “Joule/second”?
A stream of water flowing horizontally with a speed of 20 m/s pushes out of a tube of cross-sectional area 10-1m2 and hits at a v...
A meter stick moves along its length with a certain speed. The apparent length of the moving meter stick as measured by a stationary observer on the gr...
The Mohs scale is used to measure:
A charged particle oscillates about its mean equilibrium position with a frequency of 105 Hz. What is the frequency of the electromagnetic wa...
In a convex lens, when the object is at infinity, then the position of image is ______.
Charges +q and –q are placed at (–d, 0) and (+d, 0). A third charge Q is placed at (0, x). For what value of x will the force on Q be maximum?
A sound wave has a frequency of 500 Hz and wavelength of 0.68 m. What is the speed of sound?
What is the work done when a force of 10 N moves an object by 5 m in the direction of the force?
