An electron and proton are placed a distance r apart in air the ratio of the electro static force to gravitational force between them is of the order of
A sonar depth finder in a boat uses sound signals to determine the depth of water. Fourseconds after the sound leaves the boat it returns to the boat because of reflection fromthe bottom. Assume the speed of sound in water is 1,460 meters per second. The depth of the water is, in meters, :
Nuclear fission experiments show that the neutrons the uranium nuclei into two fragment
of about the same size. This process is accompanied by the emission of several:
A boy walks uniformly along the sides of a rectangular park of size 400 m x 300 m.starting from one corner to the other corner diagonally opposite.Which of the following statements is incorrect?
A fly is sitting on the objective of a telescope pointed towards the moon.What effect is expected on the photography of the moon taken through the telescope?
Increased awareness of environment issues has led chemist to develop products and processes that do not impact on the environment in terms of pollution or depletion of sources. To help chemist to achieve this aim, some principles are drawn, which one is not the guiding principle
The net heat change in a chemical reaction is the same whether it is brought about in two or more different ways in one or several steps.it is known as
The reduction potentials of non-metals are A =+0.54V, B=+1.08V, C=+1.36V. D= +2.87V Which non -metal can displace all other from aqucous solution of their salts
John hogg separated blue green algae and bacteria (prokaryotes) form nucleated protists and placed them in a separate group called Monera, within the kingdom.
Triploblastic, unsegmented, acoelomates exhibiting bilateral symmetry and reproducing both asexually and sexually, with some parasitic forms are included in
In place of the more general debate about abstract principles of government that most delegates probably expected the Constitutional Convention put ______ proposals on the table
The Metropolitan Museum of Art will soon add a wing devoted entirely to modern art whereas before other museums exhibited modern art while the Met ignored it
In a revolutionary development in technology, several manufacturers now make biodegradable forms of plastic; some plastic six. Pack rings, for example, gradually _______ when exposed to sunlight
In one shocking instance of ______ research, one of the nation's most influential researchers in the filed of genetics reported on experiments that were never carried out and published deliberately ______ scientific papers on his nonexistent work.
Having discovered the Roman aristocrats to be suffering from lead poisoning it is now thought that this was a major cause of their inability to reproduce
