Physics - Study Mode

[#886] The pressure of a fluid varies with depth h as P = PQ+pgh, where p is the fluid density. This expression is associated with
Correct Answer

(A) Pascal's law

Explanation

Solution: The pressure of a fluid varies with depth h as P = PQ+pgh, where p is the fluid density. This expression is associated with Pascal's law.

[#887] A parachute descends slowly whereas a stone dropped from the same height falls rapidly, because
Correct Answer

(C) A parachute has a larger surface area and air resistance is more

Explanation

Solution: Gravity is pulling the man down while friction with the air slows him down. With the parachute out it adds more friction slowing him down because air resistance works against the very large surface area of the parachute. A free falling skydiver that has not yet opened his parachute can make his downward speed vary between about 110 mph and 225 mph using air resistance. A spread eagled position presents the maximum area, and we fall the slowest.

[#888] Why does bleeding occur through the nose in high mountainous regions ?
Correct Answer

(C) The blood pressure of a person increases at high altitudes

Explanation

Solution: Nosebleeds can be caused by being up in a very high altitude. As you climb higher, the amount of oxygen in the air decreases. This makes the air thinner and dryer, which can in turn cause the inside of your nose to crack and bleed.

[#889] Which of the following instruments is used to measure humidity ?
Correct Answer

(C) Sling Psychrometer

Explanation

Solution: A hygrometer is an instrument used to measure relative humidity. Humidity is the measure of the amount of moisture in the air. A psychrometer is an example of a hygrometer.

[#890] Anemometer is an instrument meant for measuring ________
Correct Answer

(C) Wind speed

Explanation

Solution: An anemometer is an instrument that measures wind speed and wind pressure. Anemometers are important tools for meteorologists, who study weather patterns.