Daily NEET MCQ- July 18, 2022 - NEET MCQ

In the electrolytic process, which involves Nelson cell and castner kellner cell, the sodium amalgam is treated with water to give sodium hydroxide, hydrogen gas, and mercury. Sodium amalgam is formed when sodium metal discharges at the mercury cathode combining with mercury.

A 10 percent solution of sodium carbonate is treated with milk of lime, this is known as causticizing process and is one of the methods of preparation of sodium hydroxide, sodium carbonate reacts with calcium hydroxide to form calcium carbonate as precipitate and sodium hydroxide.

The sodium chloride that’s obtained by seawater evaporation, is purified by passing through HCl gas through the impure saturated solution of NaCl and due to common Ion effect, pure NaCl gets precipitated 28% of NaCl solution is called Brine.

Modulus of elasticity is the ratio of stress to strain. Its unit is, therefore, N/m². Energy per unit volume has the unit Nm/m³ = N/m². Force per unit length has the unit N/m. So, the correct answer is energy per unit volume.

Tension ‘T’ in string will be given by T = mv²/R = 1*4/0.1 = 40N.
Stress = Y*Strain, where Y is young’s modulus. T/A=Y*ΔL/L
∴ ΔL = TL/AY = (40*0.1)/(0.0001*10¹¹)
= 4*10^-7m = 0.4μm.

Volumetric stress is due to forces applied on the surface of a body from all directions such force is along normal at each point. This causes a change in volume while mass, obviously, remains the same. So, there is a slight change in density. Note that it is negligible but this change of density doesn’t occur in any other type of stresses, as the change in longitudinal length is compensated by change in lateral length in case of longitudinal stresses.

The cell wall covering the cell of fungi and plants is a non-living structure. The cell membrane covering the cell and the various organelles of the cell such as the nucleus and the lysosomes are living.

The cell wall covers the cell membrane of the plant and fungal cell. It provides many functions including cell-to-cell interaction, cell shape and protection from infection but it does not synthesize rubisco.

The cell wall is a non-living rigid structure that covers the cells of fungi and plants. It also provides functions like protection from infection and mechanical stresses, and cell to cell interactions.

The middle lamella is a layer present between two plant cells which joins the cell walls of both the cells. It is the first layer which is formed and deposited during cytokinesis. It mainly contains calcium pectate.