Daily NEET MCQ- September 20, 2022 - NEET MCQ

The mass of a hydrogen atom is 1.6736×10^-24 g. When converted in terms of amu, 1.6736×10^-24 g should be divided by 1.66056×10^-24 g. 1.6736×10^-24 g/1.66056×10^-24 g = 1.0078 amu = 1.008 amu. This the process to measure any atomic mass in amu.

The Atomic mass unit is a standard unit of mass that measures mass on an atomic or molecular scale. One unit of it is practically equal to 1.66056×10^-24 g. 1 amu is defined as a mass that is almost equal to one-twelfth of the mass of one carbon – 12 atom.

Given that, carbon-12 is of 70% and carbon-14 is of 30%. In order to find avg atomic mass, you should add the products of multiplications 12 with 70/100 and 14 with 30/100. 12 x 0. 7 = 8.4; 14 x 0.3 = 4.2. Now adding them 8.4 + 4.2 = 12.6

Area of rectangle is length multiplied by breadth. The area of this rectangle is 4.5×5.9 mm² = 26.55 mm².

The correct answer is 5. While calculating the number of significant digits, we need not consider the zero preceding 2.

According to the rounding off rules, if the digit to be removed is 5 and the following digit is not zero, then the last remaining digit is increased by one.
Given number = 75.66852
After applying rounding rules, 852 rounds off to 9
Hence, the final answer will be “75.669”.

Aristotle classified the organisms based on their morphological characteristics. His classification neglected characteristics like nature of the cell wall, evolutionary relationships and method of reproduction.

Aristotle classified plants based on their size into herbs (Wheat, Paddy, etc.), shrubs (Rose, Jasmine, etc.) and trees (Banyan, Banana, etc.). He classified animals based on their blood.

Aristotle classified organisms as Plants and Animals. He considered Chlorella under the category of Plants. His classification didn’t consider structure of the cell which resulted in Chlorella under Plants in his classification.

Dunaliella salina belongs to the category of Halophiles. Halophiles can survive in areas which are highly concentrated in salt. Thermophiles can survive in conditions with high temperature. Methanogens are responsible for production of methane.