Daily NEET MCQ- May 9, 2022 - NEET MCQ

Apparent frequency only depends on velocity and not the distance between source and observer. So, maximum frequency will be heard when speed is maximum, which is at the start. F = 50(330)/(330-20)
= 53.22Hz.

Thomson proposed a model of the atom, in which electrons are embedded to make it as the stable electrostatic arrangement and such that positive charge is equally distributed around a sphere. Mass is assumed to be equally distributed. So. it has different names like plum pudding, watermelon and raisin pudding model.

Henri Becquerel discovered that elements emit radiation and termed this phenomenon as radioactivity. Later Curie on research found out about α-rays, β-rays and γ-rays. Later Rutherford concluded that α particles are helium nuclei.

Small intestine is distinguishable into three regions, a ‘C’ shaped duodenum, a long coiled middle portion jejunum, and highly coiled ileum.

Vermiform appendix is a narrow finger-like tubular projection that arises from the caecum of the large intestine. The vermiform appendix is a vestigial organ in the human body.

Mucosal epithelium has goblet cells which secrete mucus that helps in lubrication. All four layers show modifications in different parts of the alimentary canal.

Muscularis layer is formed by smooth muscles which are usually arranged into an inner circular and an outer longitudinal layer. An oblique muscle layer may be present in some regions.

In the duodenum, glands are present in the sub-mucosa. The sub-mucosal layer is formed of loose connective tissue containing nerves, blood, and lymph vessels.

Beat frequency is equal to the difference between frequencies of interfering waves. In this case, beat frequency
= 6-2 = 4Hz.

As the initial beat frequency is 2Hz, the 2nd tuning fork can have a frequency of 98Hz or 102Hz. When wax is applied to the second tuning fork its frequency should decrease. On doing so the beat frequency has also increased, so the initial value of the frequency of the 2nd tuning fork must be lower than that of the first tuning fork.