The size of the Respirable Suspended Particulate Matter (R.S.P.M.) in air is

A. maximum at 0°C B. minimum at 0°C C. maximum at 4°C D. minimum at -4°C

A. if the body completely gain its original shape after removal of deforming force B. if the body remains in deformed shape even after removal of the deforming force C. if weight of the body is equal to force of buoyancy D. None of the above

A. it is the ratio of force to area and both force and area are vectors B. it is the ratio of magnitude of force to area C. it is the ratio of component of force (normal to area) to area D. None of the above

A. Due to gravity B. Due to atmospheric pressure C. Due to the presence of Eddy current in the air D. Due to exertion of surface tension by the molecules