Daily NEET MCQ- August 30, 2022 - NEET MCQ

The suitable conditions of cathode ray discharge tube are low pressure and high pressures. Pressure can be adjusted by evacuated tubes. High voltage is applied across electrodes and current starts flowing through the tube.

R. A. Millikan conducted oil drop experiment to measure the mass of oil droplets. After observation of how the charge is transferred in the experiment he concluded that charge only appears in integral multiples of e i.e. q = ne; n = ±1, ±2, ±3, etc.

In 1911, Rutherford discovered protons by performing experiments and also found out that positive charge is concentrated at centre and that it has most of the atomic mass. The name proton was first time given in the year 1920.

The time periods (T) of a satellite revolving around the earth of radius R and at height h is:
T = 2 x pi x [(R + h)³ / (G X M)]^1/2
Hence, the time period is directly proportional to (R + h)^3/2
The ratio of orbits is, therefore, 64:1.

The time periods (T) of a satellite revolving around the earth of radius R and at height h is:
T = 2 x pi x [(R + h)³ / (G X M)]^1/2
Hence, the time period is directly proportional to (R + h)^3/2
From this, we have the ratio of the time periods as 1.03.
1.03 x 100 = 103. Hence, there is a 3% change in the time period.

The time period is directly proportional to the radius of orbit raised to the power of 1.5.
If the radius is quadrupled, the time period increases by 8 times.
Hence, the new time period = 90 x 8 = 720 minutes.

Cockroaches are brown or black bodied animals that are included in class Insecta of Phylum Arthropoda. Bright yellow, red and green coloured cockroaches have been reported in tropical regions.

Cockroaches are nocturnal omnivores that live in damp places throughout the world. They have become residents of human homes and thus are serious pests and vectors of several diseases.

The mouth-parts of the cockroach consist of a labrum (upper lip), a pair of mandibles, a pair of maxillae and a labium (lower lip). A median flexible lobe acts as a tongue, which is also known as hypopharynx.

Gizzard or proventriculus has an outer layer of thick circular muscles and thick inner cuticle forming six highly chitinous plate called teeth. Gizzard helps in grinding the food particles.