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NEET • PHYSICS • MECHANICAL PROPERTIES OF FLUIDS

Mechanical properties of fluids practice · Mixed difficulty

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301 Medium

301 of 313

Analyzing +4 | -1

If there were a reduction in gravitational effect, which of the following forces do you think would change in some respect?

View answer and explanation

Correct option: D

Archimedes uplift

Option D (Archimedes uplift) is correct because Archimedes' principle depends on the gravitational force acting on the fluid.

302 Easy

302 of 313

Application +4 | -1

The additional force required to lift a flat circular disc of a radius 5 cm from the surface of water with surface tension

75\,\mathrm{dyne }c{m^{ - 1}}

will be

View answer and explanation

Correct option: B

750

\pi

dyne

Option B (750

\pi

dyne) is correct because the force is calculated by multiplying the surface tension by the circumference of the disc.

303 Easy

303 of 313

Understanding +4 | -1

Assertion: Sometimes insects can walk on water.
Reason: The gravitational force on insect is balanced by force due to surface tension.

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Correct option: A

If both Assertion and Reason are true and Reason is the correct explanation of Assertion

Option A is correct because the insect's ability to walk on water is due to surface tension, which balances the gravitational force acting on it.

304 Easy

304 of 313

Application +4 | -1

A spherical soap bubble has a radius

{r}

. The surface tension of the soap film is

T

. The energy needed to double the diameter of the bubble at the same temperature is:

View answer and explanation

Correct option: A

24 \pi r^2 {T}

Option A (

24 \pi r^2 {T}

) is correct because the energy needed is the change in surface area multiplied by the surface tension, and the surface area increases by a factor of 4 when the diameter doubles.

305 Medium

305 of 313

Application +4 | -1

Two substances of densities

{\rho _1}

and

{\rho _2}

are mixed in equal volume and the relative density of mixture is 4. When they are mixed in equal masses, the relative density of the mixture is 3. The values of

{\rho _1}

and

{\rho _2}

are

View answer and explanation

Correct option: A

{\rho _1} = 6and{\rho _2} = 2

Option A (

{\rho _1} = 6 and {\rho _2} = 2

) is correct because it satisfies both conditions: equal volume and equal mass mixing, leading to the given relative densities of the mixtures.

306 Medium

306 of 313

Analyzing +4 | -1

Assertion: Hydrostatic pressure is not a vector quantity.
Reason: Pressure is force divided by area, and force is a vector quantity.

View answer and explanation

Correct option: C

If assertion is true but reason is false

Option C (If assertion is true but reason is false) is correct because hydrostatic pressure is a scalar quantity, and while force is a vector, pressure itself is not.

307 Medium

307 of 313

Understanding +4 | -1

A drop of oil is placed on the surface of water then it will spread as a thin layer because

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Correct option: B

surface tension of water is greater than that of oil

Option B (surface tension of water is greater than that of oil) is correct because the oil spreads to minimize the overall surface energy, which happens when the higher surface tension liquid (water) has a smaller surface area.

308 Easy

308 of 313

Application +4 | -1

A large cylindrical vessel filled with a liquid up to a certain height is emptied by a horizontal capillary tube, filled to its base. Find the ratio of the time taken to empty the tank by one half, to the next one half?

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Correct option: A

\sqrt 2 - 1:1

Option A (

\sqrt 2 - 1:1

) is correct because the time taken to empty the tank is proportional to the square root of the height of the liquid.

309 Medium

309 of 313

Application +4 | -1

Two rain drops of same radii

'r'

, falling with terminal velocity

'v'

merge and form a bigger drops of radius

R

. The terminal velocity of the bigger drop is

View answer and explanation

Correct option: B

v\frac{{{R^2}}}{{{r^2}}}

Option B (

v\frac{{{R^2}}}{{{r^2}}}

) is correct because the terminal velocity is proportional to the square of the radius.

310 Hard

310 of 313

Analyzing +4 | -1

Two soap bubbles combine to form a single bubble. In this process, the change in volume and surface area are respectively V and A. If p is the atmospheric pressure, and T is the surface tension of the soap solution, the following relation is true.

View answer and explanation

Correct option: D

3pV + 4TA = 0

Option D is correct. The work done due to surface tension is related to the change in surface area, and the work done by the atmosphere is related to the change in volume. The total energy remains constant.

311 Medium

311 of 313

Understanding +4 | -1

Two pieces of metal when immersed in a liquid have equal upthrust on them; then

View answer and explanation

Correct option: C

Both pieces must have equal volumes

Option C (Both pieces must have equal volumes) is correct because the upthrust force is directly proportional to the volume of the object submerged in the liquid, according to Archimedes' principle.

312 Easy

312 of 313

Application +4 | -1

In a capillary tube experiment, a vertical

30 \mathrm{~cm}

long capillary tube is dipped in water. The water rises up to a height of

10 \mathrm{~cm}

due to capillary action. If this experiment is conducted in a freely falling elevator, the length of the water column becomes

View answer and explanation

Correct option: C

30 cm

Option C (30 cm) is correct because in a freely falling elevator, the effective gravity is zero, and the water column will fill the entire tube.

313 Medium

313 of 313

Analyzing +4 | -1

Assertion: The viscous force experienced by a steel ball moving in a liquid is less than that experienced by an aluminium ball of the same radius moving in the liquid with the same speed.
Reason: The density of steel is less than that of aluminium.

View answer and explanation

Correct option: D

If both assertion and reason are false

Option D is correct. The viscous force depends on the radius and speed, but not directly on the density of the ball. The density of steel is greater than that of aluminum.

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