Daily NEET MCQ- April 15, 2022 - NEET MCQ

The formula for calculating relative velocity of a body with respect to another body is- relative velocity = Velocity vector of A – Velocity vector of B. Hence, here, the relative velocity = velocity of B – velocity of A = 6î – 6ĵ.

The formula for calculating relative velocity of a body with respect to another body is- relative velocity = Velocity vector of A – Velocity vector of B. Hence, here, the relative velocity = velocity of B – velocity of A = -17î + 7ĵ.

The irritant red haze in traffic and congested paces is due to the oxides of nitrogen. Haze can refer to aerosols of the wet type that causes reduction in visibility. Nitrogen gas is abundantly found in the atmosphere. This nitrogen will combine with oxygen which is also present in the atmosphere and form nitrogen dioxide. Nitrogen gas has a deep red color. Now, nitrogen dioxide will combine with the aerosols and thus, form the red haze that occur in traffic and congested places.

Volcanic eruptions produce carbon dioxide. The gas is released either during eruptions or through underground magma. Carbon dioxide through underground magma is released through vents, porous rocks, etc. that feeds volcanic lakes. Due to the production of significant amounts of carbon dioxide, volcanoes also contribute to global warming.

The amount of carbon dioxide optimum for the environment should be 0.03 per cent. If this per cent is crossed, then the natural greenhouse balance may get disturbed since carbon dioxide is the major contributor to global warming. But, low concentrations are also not desirable. It can lead to kidney diseases. This condition can cause the body’s blood acid level to go up due to the lack of insulin to digest sugars in the body.

By counting the number of QRS complexes that occur in a given period, one can determine the heartbeat rate of an individual. Any deviation from the shapes of the curve indicates a possible abnormality or a disease. Hence, it is of great clinical significance.

Enlargement of auricles is represented by the enlargement of P-wave or sometimes the lengthening of PQ interval also represents the enlargement of auricles by rheumatic fever.

The depression of ST-segment shows Ischemia which means there is an insufficient supply of blood to the heart muscles or the weakening of the heart muscles.

Cardiac muscles never show the property of summation or tetanus spasm as the muscles have the longest refractory period. Cardiac muscles also have the least latent period.

The time duration between the closing of AV valves and the opening of semilunar valves is known as iso-volumetric systole. The time duration between the closing of semilunar valves and the opening of AV valves is known as iso-volumetric diastole.