Daily NEET MCQ- August 10, 2022 - NEET MCQ

Actinoids show variable oxidation states because of the smaller energy gap between 5f, 6d and 7s orbitals. Though 3+ is the most stable oxidation state, other oxidation states are possible because of the good shielding of f-electrons.

Actinoids are highly reactive metals especially in the finely divided state. All these metals are attacked by hydrochloric acid but the effect of nitric acid is very small due to the formation of a protective oxide layer on their surface.

Uranium is used as fuel in nuclear reactors. It is mined and goes through refining and enrichment before being loaded into a nuclear reactor. Nuclear power plants use a certain kind of uranium, referred to as U-235, for fuel because its atoms are easily split apart.

Two bodies collide in the absence of any external force. In this case the momentum will remain constant because there is no force, hence, there is no change in momentum. The velocity and speed of the bodies might change after collision.

Apart from the momentum, the energy also remains conserved during collision. As a matter of fact, the energy of a system often remains conserved.

The body is moving in the absence of any external force thus the momentum remains conserved.
m₁v₁ = m₂v₂. v₁ = 5 m/s, m₁ = 5 Kg, v₂ = 10 m/s. On solving, we get, m₂ = 2.5 kg.
Hence, the correct answer is 2.5 Kg.

In chordates, notochord at some point of their life and may vanish after certain period of time. They have a post anal tail. They have a dorsal nerve cord. They have a ventral heart.

Urochordata, Cephalochordata and Vertebrata are sub-phyla of Chordata. These sub-phyla are classified based on the period of presence of notochord in Chordates. Whereas unlike other three options, Agnatha is a super class in Chordates.

Vertebral column is made of cartilage in Cyclostomata. They don’t have a stomach. Their circulatory system is closed with a 2 chambered heart. Lamprey and hagfish are examples of this class.

Gnathostomata are vertebrates with jaws. This super class is classified into psices and tetrapods based on the organs they use for their movement. Pisces use fins for their movement. Tetrapods use limbs for their movement.