Daily NEET MCQ- May 19, 2022 - NEET MCQ

Average kinetic energy is given by (3/2)k_BT, which shows that it only depends on temperature.

Their average kinetic energies will be the same. Thus, 1/2mv²will be the same.
v₁²:v₂²:v₃² =m₃:m₂:m₁
= 40:30:20
= 4:3:2.

The tangential velocity is given as v = ωr. At t = 2s, r = 16 units. The angular velocity is 7 rad/s. Hence, the tangential velocity, v = 7 x 16 = 112 units/s.

The centripetal acceleration is given as a_c = rω². Here, we have r = 5t² + 7 = 27 units at t = 2s. Angular velocity is 2 rad/s. On substituting all the values, we get, the acceleration as 108 units/s².

The angular velocity is given as, ω = v/r. Hence, the function for angular velocity is ω = (2t² – 7)/3. On substituting, the suitable values, we will get the angular velocity as -5/3 rad/s.

Alkali metals are the elements of group 1. The outer shell configuration of group 1 elements is ns¹, where n is the number of it’s period. Magnesium is not an alkali metal because it’s outer shell configuration is ns².

Two moles of alkali metal reacts with one mole of hydrogen molecule in order to form 2 moles of alkali metal hydride. The correct order of reactivity of alkali metals towards hydrogen is Li < Na < K < Rb < Cs.

Anthocyanin does not play an important role in photosynthesis whereas the others have an important role. Anthocyanin main role is to provide blue, red and purple color to the plants. It also protects the plants from high temperatures and abiotic stresses.

Green sulfur bacterium does photosynthesis but does not release oxygen. They are anoxygenic. They use H₂S as a substitute for water and utilize sulfide ions to form sulfur and water. No oxygen is formed.

R. Hill found out that oxygen evolved from water in photosynthesis. It was believed that oxygen came from carbon dioxide. Later, Hill’s reaction showed that oxygen was produced from water.