A progressive sound wave is a means of transferring energy. A progressive sound waveof constant frequency is generated in air. The intensity of energy transfer is directlyproportional to another of the wave parameters. Which of the following is correct?
If a planet exists whose mass is twice that of the earth and whose radius is three times that of the earth, a1 kg mass on its surface would weight about
A ball falls on the surface from 10 m height and rebounds to 2.5 m.If the duration of contact with the floor is 0.01 seconds then the average acceleration during contact is
By which velocity a ball be projected vertically so that the distance covered by it in 5th seconds is twice the distance it covers in its 6th second (g = 10 m/s2).
A metal ball hangs from a spring balance which is placed on the wall of an elevator under freefall. Why does the spring balance show a weight of o(zero)N?
A hollow insulated conduction sphere is given a positive charge of 10μC.What will be the electric field at the centre of the sphere if its radius is 2 meters?
Five equal forces of 10N each are applied at one point and all are lying in one plane.If the angles between them are equal,the resultant force will be:
In a experiment to determine acceleration due to gravity by simple pendulum a student commits 1 % positive error in the measurement of length and 3 % negative error in the measurement of time period The percentage error in the values of g will be
Lipids are naturally occurring compounds produced in cell and are water insoluble but soluble in organic solvents. One of the followings is not a lipid. Select among the following
Methyl mercaptan, CH3SH, is one of the substances responsible for bad breath and is often used to impart a smell to natural gas in a pipeline. What will be formed when CH3SH is burned in an excess of air?
Biosphere is spread out over the surface of planet earth extending about ______ kilometers in the upper reaches of atmosphere and also in same distance into the depths of oceans
It is characteristic of the Metropolitan Opera as of every major international company that the casting is based more on the availability of singers as it is on the tastes of the music director and the public
A person who constantly calls attention to his trials and sufferings is in danger of developing a martyr complex and impressing others that he is ______ seeking sympathy
