set 1 MCQ Questions & Answers Detailed Explanation

MOST IMPORTANT general science mcq - 2 EXERCISES

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The following question based on physical properties of materials topic of general science mcq

Questions : Why the dam of water reservoir is thick at the bottom?

(a) Density of water increases with depth

(b) Quantity of water increases with depth

(c) Pressure of water increases with depth

(d) Temperature of water increases with depth

The correct answers to the above question in:

Answer: (c)

A torque is acting on the wall of the dam trying to make it topple. The bottom is made very broad so that the dam will be stable.

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Read more physical properties of materials Based General Science Questions and Answers

Question : 1

Liquid pressure at a point in a liquid does not depend on the

a) shape of the vessel in which the liquid is kept

b) density of liquid

c) depth of the point from the surface

d) acceleration due to gravity

Answer: (a)

Question : 2

A liquid rises in a capillary tube higher than water does. The difference may be due to the fact that

a) temperature of liquid is higher than that of water

b) diameter of the capillary may be different in the two cases

c) surface tension of water is less than that of the liquid

d) both (a) and (c)

Answer: (c)

The height to which liquid rises in a capillary is given by, h = ${2T}/{rpg}$.

Thus, if the height to which liquid rises is more, the liquid has greater surface tension than water.

Option (b) is not suitable because the diameter of the capillary tube containing liquid should be smaller than the capillary in which water rises. This is not mentioned clearly in option (b).

Question : 3

Hydraulic lift is based on the principle of

a) Bernoulli’s theorem

b) Pascal’s law

c) Toricelli’s theorem

d) Stoke’s law

Answer: (b)

Hydraulic lift is based on the principle of Pascal’s law.

Question : 4

Kerosene rises in the wick of the stove is due to

a) Diffusion

b) Surface tension

c) Osmosis

d) Biogen contraction

Answer: (b)

Question : 5

With the increase of temperature, the surface tension of the liquid

a) remains the same

b) may increase or decrease depending on the density of liquid

c) always increases

d) always decreases

Answer: (d)

Surface-Tension is the property of liquid at rest.

As we increase temperature, due to the gain in kinetic energy of molecules, surface tension decreases.

Question : 6

Elastomers are the materials which

a) have very small elastic range

b) are not elastic at all

c) do not obey Hooke’s law

d) None of these

Answer: (c)

Elastomers do not obey Hooke’s law.

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