Daily NEET MCQ- August 27, 2022 - NEET MCQ

The hydrides of carbon are called hydrocarbons alkanes, alkenes or alkynes, whereas the hydrides of silicon are called silanes and the hydrides of germanium are called Germanes the only hydrides of stannane and plumbum are stand and plumbane.

The elements of Carbon family are the elements of group 14. They are carbon, Silicon, Germanium, stannum and plumbum. Their valence shell configuration is ns²np² and their valency is four. But aluminium belongs to group 13.

There are mainly five elements in carbon family; carbon, silicon, germanium, stannum and plumbum. The carbon and silicon are non-metals, germanium is a metalloid whereas stannum, plumbum are metals.

When a force is applied on a solid body, internal forces develop inside it. Pressure is the external force per unit area while stress is the internal force per unit area. Note that pressure and stress aren’t the same.

Force = 1N. Initial area = πr² = 2.82*10^-5m².
Stress = Y*Strain
Δl = F/A * l/Y = (1/2.82*10^-5)*(1/10⁵) = 0.35m
As volume will remain same (we can also say that product of l & r² will be constant as other terms in expression of volume are constants).
1*3² = 1.35*R²
⇒R = 2.58m.

Kilogram is the standard unit of measurement of mass. Pound and gram are also units of mass nut are not standard. Dozen is a unit of measurement of quantity.

Frogs can live both on land and in freshwater and belong to class Amphibia of phylum Chordata. The most common species of frog found in India is Rana tigrina.

The frogs are not seen during peak summer and winter because during this period they take shelter in deep burrows to protect them from extreme heat and cold. This is called as summer sleep (Aestivation) and winter sleep (Hibernation) respectively.

The alimentary canal of frogs is short because they are carnivores and hence the length of the intestine is reduced. The digestive system consists of the alimentary canal and digestive glands.

Food is captured by the bilobed tongue of the frog. Digestion of food takes place by the action of HCl and gastric juices secreted from the walls of the stomach.