For a system to transmit thousands of telephones conversations, several television programs and numerous data signals, it need the following number so threads of optical fibre
A vehicle of mass 120 kg is moving with a uniform velocity of 108 km/h.The force required to stop the vehicle in 10s force required to stop the vehicle in 10s is:
A body of mass 5 kg is moving with a momentum of 10 kg m/s.A force of 0.2 N acts on it in the direction of motion of the body for 10 seconds.The increase in its kinetic energy is
Radius of planet A is twice that of planet B and the density of A is one third that of B. the ratio of the acceleration due to gravity at the surface of A to that at the surface of B is
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
If a graph is plotted between temperature on x-axis and volume on Y-axis for 1 mole of gas,then we get straight line which cuts the temperature axis at
A student mixed ethyl alcohol with small amount of sodium dichromate and added it to the hot solution of dilute sulphuric acid. A vigorous reaction took place. He distilled the product formed immediately. What was the product?
Rise in vapour pressure of water from 30 to 60°C is only 32 torr to 149.4 torr (117.4 torr) but from 60 to 90°C is 149.4 to 527.8 torr (378.4 torr).it is due to
The rate of diffusion of hydrogen gas is three times than that of an unknown gas at same temperature and pressure than the molar mass of unknown gas is
The molecular mass of a polymer is obtained by multiplying mass of the monomer unit with the degree of polymerization, The degree of polymerization of PVC is 1000.What is molecular mass?
A compound X has all of the properties below. It is a liquid at 25°C it mixes completely with water it reaets with aqueous sodium hydroxide, What could X be?
Her novel published to universal acclaim, her literary gifts acknowledged by the chief figures of the Harlem Renaissance, her reputation as yet ______ by envious slights, Hurston clearly was at the ______ of her career
The commission studying mass transportation suggested that the Metropolitan Transit Authority hold off purchasing new subway cars and spend money instead on preventive maintenance of all cars on repairs of substandard cars on crime prevention in all stations an better lighting for the busiest stations
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
Like their counterparts in other countries the student movement in the united states in the 1960 was a powerful one and probably helped to bring the war in Vietnam to an end
The president of the block association tried to convince her neighbours they should join forces to prevent crime in the neighbour hood rather than continuing to be victimized