Physics - Study Mode

[#326] Amount of water vapour (gaseous) in a given volume of air (cubic metre) is known as:
Correct Answer

(C) Absolute humidity

Explanation

Solution: The relative humidity of air at a given temperature is the ratio of mass of water vapour actually present in a certain volume of air to the mass of water vapour required to saturate the same volume of air at the same temperature, miltiplied by 100. Absolute Humidity refers to the amount of water vapour present in unit volume of air, expressed in grams per cubic metre.

[#327] An ideal gas cannot be
Correct Answer

(A) Liquified

Explanation

Solution: An ideal gas have no intermolecular force of attraction, so it cannot be liquefied by applying high pressure and decreasing temperature.

[#328] Super cooling stands for cooling of a liquid :
Correct Answer

(B) Below freezing point

Explanation

Solution: Supercooling, also known as undercooling, is the process of lowering the temperature of a liquid or a gas below its freezing point without it becoming a solid.

[#329] The spring constant of a spring depends on its
Correct Answer

(D) Thickness, its diameter and its material

Explanation

Solution: In dealing with a coil spring the spring constant will depend on the stiffness of the spring material, the thickness of the wire from which the spring is wound and, diameter of the turns of the coil, the number of turns per unit length and the overall length of the spring.

[#330] Steel is more elastic than rubber because it :
Correct Answer

(A) Requires larger deforming force

Explanation

Solution: The elasticity of a material is determined by its ability to return to its original shape after being deformed. Steel, being a metal, has a high modulus of elasticity and requires a larger deforming force to change its shape, but it also has the ability to return to its original shape once the force is removed. Rubber, on the other hand, is a polymer with a lower modulus of elasticity, meaning it is easily deformed and doesn't return to its original shape as effectively as steel.