What Do You Know About Oxygen? Trivia Facts Quiz

Explanation
Nitrogen, oxygen, and argon make up 99.96% of dry air. Nitrogen is the most abundant gas, making up about 78% of the atmosphere. Oxygen is the second most abundant gas, comprising approximately 21% of the air. Argon is a trace gas, but still present in significant amounts, accounting for around 0.93% of the atmosphere. Therefore, these three gases combined make up almost all of the composition of dry air.

Explanation
The question is asking for a scale of temperature, and the options given are Celsius, Fahrenheit, Kelvin, and Kilograms. Celsius, Fahrenheit, and Kelvin are all scales of temperature, while kilograms is a unit of mass, not temperature. Therefore, the correct answer is Kilograms.

Explanation
The statement "Pressure increases as we increase altitude" is false. As altitude increases, the atmospheric pressure decreases. This is because the weight of the air above decreases with increasing altitude, resulting in a decrease in the number of air molecules per unit volume and therefore a decrease in pressure. This is why people often experience a decrease in air pressure and may feel discomfort or have difficulty breathing at higher altitudes.

Explanation
Water vapor is less dense than dry air because water molecules are lighter than the molecules that make up dry air. When water evaporates, it turns into a gas and mixes with the air, increasing the overall volume of the air. This increase in volume without a significant increase in mass leads to a decrease in density. Therefore, water vapor is less dense than dry air.

Explanation
When the weight of mercury is greater than the atmospheric pressure, it means that the pressure exerted by the column of mercury is higher than the pressure exerted by the atmosphere. In this situation, the mercury level in a tube or container will fall. This is because the higher pressure inside the container pushes the mercury down, causing it to decrease in level. Therefore, the statement "If the weight of mercury is more than the atmospheric pressure, the mercury level falls" is true.

Explanation
The partial pressure of O2 at sea level is higher than the partial pressure of O2 on the summit of Mount Everest. This is because the atmosphere at lower altitudes, such as sea level, has a higher concentration of oxygen molecules compared to higher altitudes. As altitude increases, the air becomes thinner and the concentration of oxygen decreases, resulting in a lower partial pressure of O2 on the summit of Mount Everest.

Explanation
Flow occurs when there is a pressure difference between two areas. This pressure difference creates a force that pushes a fluid or gas from an area of higher pressure to an area of lower pressure. Without a pressure difference, there would be no force to drive the flow, and therefore flow would not occur.