Daily NEET MCQ- September 16, 2022 - NEET MCQ

Tin changes is oxidation state from + 2 to + 4. Increase in oxidation number indicates Oxidation reaction. Oxidation is the loss of electrons by an atom, ion or molecule, it is also known as the de^–electronation.

Chemical reactions which involves both oxygen as well as reduction process simultaneously are known as redox reactions. The above given reaction involves both oxidation and reduction reactions, so it is a Redox reaction.

Addition of electronegative element or removal of any other electropositive element is also considered as a process that involves oxidation. Here, sulphur is an electronegative element. So the formation of zinc sulphide is an Oxidation reaction.

The continuity equation is based on the conservation of mass. We consider that fluid is incompressible (constant density) and say that mass of fluid passing through 2 different regions at the same time is the same.
∴ density X Vol₁ = density X Vol₂.
∴ Vol₁ = Vol₂.
∴ A₁v₁Δt = A₂v₂Δt
∴ A₁v₁ = A₂v₂.

For using the continuity equation we assume that the flow is incompressible, laminar and non-viscous. The option that says compressible flow implies that fluid’s density can be changed. So it’s incorrect. The option that says turbulent flow is incorrect as we have to assume flow to be laminar for the equation of continuity to hold. The option that says viscous flow is also incorrect because we assume flow to be frictionless for the equation of continuity to hold.

There are 7 base units for measuring physical quantities according to the SI system. They are kilogram (kg) for mass, second (s) for time, kelvin (K) for temperature, ampere (A) for electric current, mole (mol) for the amount of a substance, candela (cd) for luminous intensity, and meter (m) for distance.

The molecular weight of biomacromolecules such as nucleic acids, proteins and carbohydrates is measured in Daltons. Angstrom and nanometer are units of length while farad is a unit of capacitance.

The acid insoluble pool or fraction of the homogenized plant or animal tissue contains proteins, lipids, carbohydrates and nucleic acids. These molecules are also known as biomolecules. Vitamins are not present.

The acid insoluble layer of homogenized, strained tissue consists of proteins, nucleic acids, lipids and polysaccharides. Out of these biomacromolecules, lipids have a molecular weight lesser than 10,000 Da.

When tissue matter is homogenized and strained, it separates into an acid soluble pool and an acid insoluble pool. The acid insoluble pool contains proteins, nucleic acids, polysaccharides and lipids. Out of these, only lipids are not polymeric.