Question

Which of the following is not a branch of physics?
A. Mechanics
B. Optics
C. Cytogenetics
D. Electrodynamics

Answer 1

This question talks broadly about the branches of physics and its subdivisions, the necessary parts that make up physics in line with force, light and flow of currents in and out of a circuit.

Complete step by step answer:
Mechanics is a branch of physics which tells about the motions of bodies and forces producing motions. Mechanism is the aspect of physics concerned with the motion of objects and it can be divided into kinetics and dynamics.
Optics is an aspect of physics concerned with the behavior and properties of light.
Cytogenetics is strictly the study of chromosomes, their structure, their location and their functions in cells (animal cell and plant cell). Cytogenetics is strictly about the biological aspect of matter unlike physics that deals with nature in line with energy.
Electrodynamics is another branch of physics concerned with the effects of charged bodies in motion such as magnetism, electromagnetic radiation and induction.
These aspects of physics can be found in the production of automobiles, aircraft, elevators that helps to travel to the top of a very high building, in the production of light emitting objects for the sake of sight, also in recognition and distinction of one object from other without mixing them up and making an object to behave like the other when forced.
Therefore, Cytogenetics is not a branch of physics. The answer is Option C.

Note: The other aspects of physics are electricity, quantum physics etc which does not involve cells, tissues, organs and systems and how they all affect matter which comprises animals and plants.