Daily NEET MCQ- June 9, 2022 - NEET MCQ

Let the pressure outside the bubble be P₁, between the two layers be P₂ and pressure inside the bubble be P₃.
P₂ – P₁ = 2S/R
P₃ – P₂ = 2S/R
∴ P₃ – P₁ = 4S/R
This shows that excess pressure just inside the first layer is 2S/R while excess pressure completely inside the bubble is 4S/R.

The pressure in the bubble will be more than the pressure just outside it by an amount 2S/R.
The pressure just outside the bubble is P₀ + ρgh.
Therefore, pressure inside bubble = P₀ + ρgh + 2S/R
= 10⁵ + (1000*10*1) + (2*0.075/0.01)
= 110015 Pa.

Volume of drop = 4/3πR².
Let the radius of droplets be ‘r’. Volume of big drop will be equal to volume of 10 droplets.
10*4/3πr³ = 4/3πR³ ⇒ r = 10^1/3 *R.
Surface area of big drop = 4πR² & surface area of 10 droplets = 10 * 4πr² = 40πR²(10^2/3).
Surface energy of big drop = 4πR² *S = 4π(0.0025)*0.08 = 0.0025
Surface energy of droplets = 40πR²(10^2/3) *S = 40π(0.0025)(10^2/3)*0.08 = 0.1166.
Change in surface energy = 0.1166 – 0.0025 = 0.1141 J.

It is the lowest layer of the earth’s atmosphere and is held to the earth by the gravitational force. It is very vital for human life and it protects us from harmful radiation. It contains important molecules like dioxygen, carbon dioxide, water vapor, etc.

Mercury is not a gas, it is a liquid in room temperature and it is a metal. There are 11 gases which are gases at room temperature they are hydrogen, Nitrogen, Oxygen, fluorine, chlorine, Helium, Neon, Argon, Krypton, Xenon, and Radon.

Boyle’s law is about the relationship between pressure and volume while Charles law about temperature and volume. Gay lussac’s law is about pressure-temperature relationship & hooks law is a law that is in Physics relating to stress.

A cluster of cells that have a common origin and work together to achieve a specific function. A plant tissue varies from that of an animal because they vary in their functions and characters. In plant there are two types of tissues, namely, Meristematic and permanent tissues. Simple permanent tissues comprise of sclerenchyma, collenchymas, parenchyma and epidermis.

Meristematic tissues are quite small which allows large number of cell division. Their cytoplasm is quite dense which means that they contain many cell organelles that help them increase their rate of respiration. Their cell wall is thin which allows them to divide easily. Vacuoles are absent in Meristematic tissues.

Collenchyma are the tissues responsible for flexibility in plants and provides support and strength for the plants. They have less intercellular spaces in between them. They allow bending of stems and leaves without breaking. Their cell walls are irregularly thickened.

Sclerenchymatous cells are the dead cells responsible for stiffness in plants. The husk of a coconut is made of Sclerenchymatous tissue. They are of two kinds, namely, sclereids and fibers. Simple pits are present in thickened cell walls of sclerenchyma.