MCQ: Assertion and Reason - 2 - SSC CGL MCQ

Ventilators are provided near the roof as the air upon heating, rises and so can be thrown out of a room through high ventilators.

Seeds are treated with fungicides before sowing to avoid seed-borne diseases. However, seeds may germinate, even if not treated with a fungicide solution.

A is clearly true. However, this happens because a saltwater fish is hypotonic to its environment while a freshwater fish is hypertonic to its environment.

Assertion (A) states that no food material normally enters the windpipe during swallowing, which is true because the process of swallowing involves the epiglottis covering the opening of the windpipe to prevent food or liquid from entering it.

Reason (R) explains this by highlighting that during swallowing, the back portion of our tongue covers the opening of the windpipe with the epiglottis, ensuring that food or drink is directed towards the esophagus rather than entering the windpipe.

Option (a) affirms that both A and R are true, and R provides the correct explanation for A, as the action of the tongue and epiglottis working together helps prevent food from entering the windpipe during swallowing.

We feel uncomfortable in hot and humid climate because, in hot weather, the body sweats more but due to high humidity, this sweat does not evaporate easily.

Leakages in household gas cylinders can be detected because of the strong smell of ethyl mercaptan mixed with LPG.

When a body is dipped in a liquid, there is a decrease in weight due to the upward thrust exerted on it by the water.

The low electrical resistance of copper makes it a good electric conductor.

So it is used to make electric wires.

The husk of unpolished rice contains Vitamin B1, deficiency of which causes the disease Beriberi.

So, the rice should be eaten unpolished.

We prefer to wear dark clothes in winter because they absorb heat and keep the body warm.

However, white clothes are good reflectors of heat and are worn in summer.

Assertion (A) is true. On the equinoxes, which occur twice a year (around March 20th and September 22nd), the day and night are approximately equal in duration all over the globe. This is because the Earth's axis is neither inclined toward nor away from the Sun, resulting in nearly equal sunlight distribution across the Earth.

Reason (R) is also true. During the equinoxes, the position of the Earth with respect to the Sun is such that neither pole is inclined toward the Sun. This lack of inclination is why the sunlight falls almost equally on both hemispheres, resulting in the equal length of day and night across the globe.

Mercury is the smallest planet, but Pluto is the farthest planet in the solar system.

Eskimos live in snow houses called igloos because snow, being a bad conductor of heat, these houses are warm inside.

Assertion (A) is true. Areas near the Equator typically experience rainfall throughout the year. This region often encounters a consistent amount of precipitation due to its proximity to the Intertropical Convergence Zone (ITCZ), where air masses converge, leading to consistent upward motion and subsequent rainfall.

Reason (R) is also true. High temperatures and high humidity near the Equator create conditions favorable for the formation of conventional or convective rainfall. This happens when the warm air rises, cools, condenses, and forms clouds, often resulting in afternoon showers or thunderstorms.

Therefore, both assertions are accurate, and the reason (R) effectively explains why areas near the Equator receive rainfall throughout the year due to the prevailing weather conditions and the mechanisms behind rainfall in those regions.

The use of chlorofluorocarbons is banned nowadays because these cause holes in the ozone layer through which ultraviolet rays penetrate and may cause skin cancer.