Daily NEET MCQ- August 24, 2022 - NEET MCQ

According to Dalton’s Atomic Theory, All atoms of a given element have identical properties, including identical mass. The reason behind this is that they belong to the same element (here “they” is about atoms).

When electrons are distribution into the orbitals of the atoms by following Aufbau’s principal, Hund’s rule maximum multiplicity and Pauli’s exclusive principle, the order they are filled is represented by the electronic configuration.

Every period ends with a noble gas, as the element at the end of the period is with the fully filled orbitals. The 4^th period has an outer shell as O i.e. n = 4. So the configuration is [Ar}4s²3d¹⁰4p⁶, that is Krypton.

Boiling occurs when vapour pressure of liquid is the same as atmospheric pressure. The vapour pressure increases with increase in temperature. So when temperature has been increased sufficiently boiling starts. But with increase in pressure at higher vapour pressure has to be reached which is obtained by increasing temperature and therefore we say boiling point increases.

For changing a solid into liquid, heat has to be supplied and this change occurs at constant temperature. Q = mL
⇒ 30 = 5L
⇒ L = 6 cal/g,

Melting is the conversion of solid to liquid at constant temperature. It is endothermic and the melting temperature varies from substance to substance and also on atmospheric conditions like pressure.

In humans, the excretory system consists of a pair of kidneys, one pair of ureters, a urinary bladder, and urethra. Kidneys are reddish-brown and bean-shaped structures.

Each kidney of an adult human measures for about 10-12 cm in length, 5-7 cm in width, and 2-3 cm in thickness with an average weight of 120-170 grams.

Through the hilum, the nerves, the ureters and the blood vessels enter the kidneys. The hilum is a notch which is present towards the centre of the inner concave surface of the kidney.

Cortex is mainly responsible for the formation of columns of Bertini. The portion of the cortex which extends in between the medullary pyramids as renal columns form the columns of Bertini. The medulla region of the kidney is divided into a few conical masses called medullary pyramids which project into the calyces.