Daily NEET MCQ- March 9, 2022 - NEET MCQ

There is no change in bond angles and bond lengths in the conformations of ethane. There is only change in dihedral angle.

Both the astronauts are in the condition of weightness. Gravitational force between them pulls towards each other.

Centre of mass may or may not coincide with centre of gravity.

Reading of potentiometer is accurate because during taking reading it does not draw any current from the circuit.

The nitrogen atom has two stable isotopes: ¹⁴N and ¹⁵N, 99.6% and 0.4% (by mass) respectively. There are also fourteen known radioisotopes with one additional nuclear isomer.

With five electrons in its outer most shell, it needs three more electrons to have a complete shell consisting of eight electrons which is the noble electronic configuration. The ion formed by the nitrogen atom is N^3-. It attains the electronic configuration on neon.

Gases like argon is also nontoxic. However, nitrogen gas is still the most preferred since it eliminates all the possibilities of unwanted oxidation and explosions. In the welding industry this prevents metals from corroding. Nitrogen is used in the food industry for packaging since it provides a pressurized atmosphere that reduces package collapse.

The ozone layer stops ultraviolet radiation. It acts as a filter against the harmful Ultraviolet radiation from the sun from reaching the living being on earth, thereby protecting the life on earth. This is the significance of the ozone layer.

Humans possess 4 parathyroid glands. They are present on the back side of the thyroid glands. The thyroid gland has two lobes. Each lobe of the thyroid gland contains one pair of parathyroid glands.

PTH or parathyroid hormone is secreted by the parathyroid gland. It is important for regulating the blood calcium level along with thyrocalcitonin. PTH increases calcium ion absorption from digested food.