Physics-
General
Easy
Question
A cylindrical piston of mass M slides smoothly inside a long cylinder closed at one end, enclosing a certain mass of gas. The cylinder is kept with its axis horizontal. If the piston is disturbed from its equilibrium position, it oscillates simple harmonically. The period of oscillation will be
The correct answer is:
Let the piston be displaced through distance x towards left, then volume decreases, pressure increases. If 
is increase in pressure and 
is decrease in volume, then considering the process to take place gradually (i.e. isothermal)
(neglecting 
This excess pressure is responsible for providing the restoring force (F) to the piston of mass M.
Hence 
Comparing it with 
Short trick : by checking the options dimensionally. Option (a) is correct
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A thin uniform rod of mass M and length L hangs from a frictionless pivot and is connected at the bottom by a spring to the wall as shown. The spring constant is K. The system is allowed to oscillate by pressing end B of the rod and releasing. The period of oscillation will be
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Acetic acid is a weak electrolyte because:
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A body is projected horizontally from the top of a high tower with a speed of 20 m/s. After 4 sec the displacement of the body is (take g=10m/s2)
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Consider the reaction:
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Physics-General
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An endothermic reaction with high activation energy for the forward reaction is given by the diagram:
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Chemistry-General
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Chemistry-General
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Chemistry-General
