A healthy man is inhaling 6000ml of air per minute. His tidal volume is 500ml .Then his breath rate is

(A) 20 times/min
(B) 15 times/min
(C) 12 times/min
(D) 16 times/min

If the rate constant k of a reaction is 1.6 times 10^–3(mol//l)(min^–1) . The order of the reaction is:

A cylindrical vessel of radius 0.5 m is filled with oil at the rate of 0.25 pi m^3 / minute. The rate at which the surface of the oil is rising, is (a) 1 m/min. (b) 2 m/min. (c) 5 m/min. (d) 1.25 m/min.

If alveolar ventilation is 4200 mL//min , respiratory frequency is 12 breaths per minute, and tidal volume is 500 mL, what is the anatomical-dead-space ventialtion ?

Water is drained from a vertical cylindrical tank by opening a valve at the base of the tank. It is known that the rate at which the water level drops is proportional to the square root of water depth y , where the constant of proportionality k >0 depends on the acceleration due to gravity and the geometry of the hole. If t is measured in minutes and k=1/(15), then the time to drain the tank if the water is 4 m deep to start with is (a) 30 min (b) 45 min (c) 60 min (d) 80 min

The half-change time for a first order reaction is 20 min hence the rate constant for the reaction………….. .

The radius of the base of a cone is increasing at the rate of 3 cm/min and the altitude is decreasing at the rate of 4 cm/min. The rate of change of lateral surface when the radius is 7 cm and altitude is 24cm is (a) 108pi cm^2 per min (b) 7pi cm^2 per min (c) 27pi cm^2per min (d) none of these

If the cardiac output of a person is 5 lit. and his breathing rate is 18 per min. The amount of blood that will be oxygenated in the lungs per min will be –

The half life of 2g sample of radioactive nuclide 'X' is 15 min. The half life time of 1g sample of X is

A man is twice as old as his son. 20 years ago, the age of the man was 12 times the age of the son. Find their present ages.

A tank contains 100 litres of fresh water. A solution containing 1 gm/litre of soluble lawn fertilizeruns into the tank the of 1 lit/min and the mixture pumped out of the tank at the rate of at rate of f 3 litres/min. Find the time when the amount of fertilizer in the tank is maximum.