Daily NEET MCQ- June 16, 2022 - NEET MCQ

The first law of thermodynamics is based on the conservation of energy. It deals with work done and heat energy supplied or removed from a system. It basically says that energy supplied to a system is conserved.

The first law states that ΔU=ΔQ – ΔW
= 315 – 20
= 295cal.
Work is positive as it is done by the system. Heat is positive as it is supplied to the system.

The kinetic energy of the block will change into internal energy of the system.
Initial kinetic energy = 0.5*1*25 = 12.5J.
Therefore the internal energy change = 12.5J.

In redox reactions, water reacts with metals and nonmetals both. For example, take the reaction of sodium with water, the products are sodium hydroxide and hydrogen, whereas fluorine reacts with water in order to form hydrogen cation and fluorine anion with oxygen.

In hydrated salt, there are five types of water. The five types of water in hydrated salt are i. coordinated water, ii. hydrogen bonded water, iii. lattice water, iv. clathrate water and v. zeolite water.

Permutit is hydrated sodium aluminum silicate, it exchanges it’s sodium ions for divalent ions of calcium and magnesium, permutit when fully exhausted can be regenerated by treating with 10% of sodium chloride solution. It is the most efficient method to get water with zero degrees of hardness.

The circulatory pathways are of two major types-open circulatory systems and closed circulatory system. The closed circulatory system is considered to be more advantageous as the flow can be more precisely regulated.

In fishes, the heart pumps out deoxygenated blood which is oxygenated by the gills and is supplied to the body parts where deoxygenated blood is returned to the heart. This type of circulation is known as single circulation.

In amphibians and reptiles, the left atrium receives oxygenated blood from the gills/lungs/skin and the right atrium gets deoxygenated blood from other body parts. However, they get mixed up in the single ventricle which pumps out mixed blood and is therefore known as incomplete double circulation.

Human circulatory system which is also called a blood vascular system consists of a muscular chambered heart, a network of closed branching blood vessels and blood, the fluid which is circulated.