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NEET Practice Questions (MCQs) with Answers & Solutions

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The work done in blowing a soap bubble of radius 0.2 m is (the surface tension of soap solution being 0.06 N/m)

$192 π \times 10^{- 4} J$

$280 π \times 10^{- 4} J$

$200 π \times 10^{- 4} J$

None of these

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Explanation

(a) $W = 8 {πr}^{2} \times T = 8 π \times (0.2)^{2} \times 0.06 = 192 π \times 10^{- 4} J$

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A liquid film is formed in a loop of area 0.05 $m^{2}$ . Increase in its potential energy will be (T = 0.2 N/m)

$5 \times 10^{- 2} J$

$2 \times 10^{- 2} J$

$3 \times 10^{- 2} J$

None of these

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Explanation

(b) Increment in Potential energy = $T \times ∆ A$

$= 0.02 \times 2 \times 0.05 = 2 \times 10^{- 2} J$

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In order to float a ring of area 0.04 $m^{2}$ in a liquid of surface tension 75 N/m, the required surface energy will be

3 J

6.5 J

1.5 J

4 J

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Explanation

(a) $E = T \times ∆ A = 75 \times 0.04 = 3 J$

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If two soap bubbles of equal radii r coalesce then the radius of curvature of interface between two bubbles will be

Infinity

1/2r

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Explanation

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When the temperature is increased the angle of contact of a liquid

Increases

Decreases

Remains the same

First increases and then decreases

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Explanation

(b) Cohesive force decreases so angle of contact decreases.

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The angle of contact between glass and mercury is

0°

30°

90°

135°

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Explanation

(d) The angle of contact between glass and mercury is 135 $°$ .

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A mercury drop does not spread on a glass plate because the angle of contact between glass and mercury is

Acute

Obtuse

Zero

$90 °$

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Explanation

(b) The mercury does not spread on a glass plate because the angle of contact between glass and mercury is obtuse.

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The liquid meniscus in the capillary tube will be convex if the angle of contact is

Greater than 90°

Less than 90°

Equal to 90°

Equal to 0°

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Explanation

(a)

For convex meniscus the angle of contact is greater than $90 °$

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The value of contact angle for kerosene with solid surface.

0°

90°

45°

33°

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Explanation

(a) The angle of contact will be equal to zero as it completely wets the solid surface.

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Nature of meniscus for liquid of $0^{0}$ angle of contact

Plane

Parabolic

Semi-spherical

Cylindrical

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Explanation

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