Surface Tension - CBSE STD 12 Science JEE physics Questions

Q 1Assertion & Reason1 Mark

Assertion : The shape of a liquid drop is spherical.
Reason : The pressure inside the drop is greater than that of outside.

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Q 2Assertion & Reason1 Mark

Assertion : Hot soup tastes better than the cold soup.
Reason : Hot soup has high surface tension and it does not spread properly on our tongue.

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Q 3Assertion & Reason1 Mark

Assertion : The water rises higher in a capillary tube of small diameter than in the capillary tube of large diameter.
Reason : Height through which liquid rises in a capillary tube is inversely proportional to the diameter of the capillary tube.

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Q 4Assertion & Reason1 Mark

Assertion : Tiny drops of liquid resist deforming forces better than bigger drops.
Reason : Excess pressure inside a drop is directly proportional to surface tension.

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Q 5Assertion & Reason1 Mark

Assertion : A large soap bubble expands while a small bubble shrinks, when they are connected to each other by a capillary tube.
Reason : The excess pressure inside bubble (or drop) is inversely proportional to the radius.

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Q 6MCQ1 Mark

Four smooth steel balls of equal mass at rest are free to move along a straight line without friction. The first ball is given a velocity of $0.4 \mathrm{~m} / \mathrm{s}$. It collides head on with the second elastically, the second one similarly with the third and so on. The velocity of the last ball is

✓
$0.4 \mathrm{~m} / \mathrm{s}$
B
$0.2 \mathrm{~m} / \mathrm{s}$
C
$0.1 \mathrm{~m} / \mathrm{s}$
D
$0.05 \mathrm{~m} / \mathrm{s}$

Answer: A.

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Q 7MCQ1 Mark

Consider elastic collision of a particle of mass $m$ moving with a velocity $u$ with another particle of the same mass at rest. After the collision the projectile and the struck particle move in directions making angles $\theta_1$ and $\theta_2$ respectively with the initial direction of motion. The sum of the angles. $\theta_1+\theta_2$, is

A
$45^{\circ}$
✓
$90^{\circ}$
C
$135^{\circ}$
D
$180^{\circ}$

Answer: B.

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Q 8MCQ1 Mark

An object of mass $3 \mathrm{~m}$ splits into three equal fragments. Two fragments have velocities $\hat{v j}$ and $\hat{v i}$. The velocity of the third fragment is

A
$v(\hat{j}-\hat{i})$
B
$v(\hat{i}-\hat{j})$
✓
$-v(\hat{i}+\hat{j})$
D
$\frac{v(\hat{i}+\hat{j})}{\sqrt{2}}$

Answer: C.

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Q 9MCQ1 Mark

A drop of mercury of radius $2 \mathrm{~mm}$ is split into $8$ identical droplets. Find the increase in surface energy. (Surface tension of mercury is $0.465 \mathrm{~J} / \mathrm{m}^2$ )

✓
$23.4 \mu \mathrm{J}$
B
$18.5 \mu \mathrm{J}$
C
$26.8 \mu \mathrm{J}$
D
$16.8 \mu \mathrm{J}$

Answer: A.

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Q 10MCQ1 Mark

Water rises in a vertical capillary tube upto a height of $2.0 \mathrm{~cm}$. If the tube is inclined at an angle of $60^{\circ}$ with the vertical, then upto what length the water will rise in the tube

A
$2.0 \mathrm{~cm}$
✓
$4.0 \mathrm{~cm}$
C
$\frac{4}{\sqrt{3}} \mathrm{~cm}$
D
$2 \sqrt{2} \mathrm{~cm}$

Answer: B.

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Surface Tension question types

Surface Tension questions

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Surface Tension JEE physics - Surface Tension

Surface Tension question types

Surface Tension questions

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