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Capillarity Physics Sample Questions

Capillarity questions

25 questions with answers in Capillarity:

Ques: Due to capillary action, a liquid will rise in a tube, if the angle of contact is
(a) Acute
(b)  Obtuse
(c) 90°
(d) Zero
Ans. (a)

Ques: In the state of weightlessness, a capillary tube is dipped in water, then water
(a) Will not rise at all
(b) Will rise to same height as at atmospheric pressure
(c) Will rise to less height than at atmospheric pressure
(d) Will rise up to the upper end of the capillary tube of any length
Ans. (d)

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Ques: A capillary tube made of glass is dipped into mercury. Then
(a) Mercury rises in the capillary tube
(b) Mercury rises and flows out of the capillary tube
(c) Mercury descends in the capillary tube
(d) Mercury neither rises nor descends in the capillary tube
Ans. (c)

Ques: It is not possible to write directly on blotting paper or newspaper with ink pen
(a) Because of viscosity
(b) Because of inertia
(c) Because of friction
(d) Because of capillarity
Ans. (d)

Ques: If the diameter of a capillary tube is doubled, then the height of the liquid that will rise is
(a) Twice
(b) Half
(c) Same as earlier
(d) None of these
Ans. (b)

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Ques: Two capillaries made of same material but of different radii are dipped in a liquid. The rise of liquid in one capillary is 2.2 cm and that in the other is 6.6 cm. The ratio of their radii is
(a) 9 : 1
(b) 1 : 9
(c) 3 : 1
(d) 1 : 3
Ans. (c)

Ques: A capillary tube when immersed vertically in liquid records a rise of 3 cm. If the tube is immersed in the liquid at an angle of 60o with the vertical. The length of the liquid column along the tube is
(a) 9cm
(b) 6cm
(c) 3cm
(d) 2cm
Ans. (b)

Ques: When a capillary is dipped in water, water rises to a height h. If the length of the capillary is made less than h,  then
(a) The water will come out
(b) The water will not come out
(c) The water will not rise
(d) The water will rise but less than height of capillary
Ans (b)

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Ques: During capillary rise of a liquid in a capillary tube, the surface of contact that remains constant is of
(a) Glass and liquid
(b) Air and glass
(c) Air and liquid
(d) All of these
Ans. (c)

Ques: If capillary experiment is performed in vacuum then for a liquid there
(a) It will rise
(b) Will remain same
(c) It will fall
(d) Rise to the top
Ans. (a)

Ques: If liquid level falls in a capillary then radius of capillary will
(a) Increase
(b) Decrease
(c) Unchanged
(d) None of these
Ans. (a)

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Ques: Two capillary tubes of same diameter are put vertically one each in two liquids whose relative densities are 0.8 and 0.6 and surface tensions are 60 and 50 dyne/cm respectively Ratio of heights of liquids in the two tubes  h1/h2is
(a) 10/9
(b) 3/10
(c) 10/3
(d) 9/10
Ans. (d)

Ques: Water rises against gravity in a capillary tube when its one end is dipped into water because
(a) Pressure below the meniscus is less than atmospheric pressure
(b) Pressure below the meniscus is more than atmospheric pressure
(c) Capillary attracts water
(d) Of viscosity
Ans. (a)

Ques: Water rises up to a height h in a capillary tube of certain diameter. This capillary tube is replaced by a similar tube of half the diameter. Now the water will rise to the height of
(a) 4h
(b) 3h
(c) 2h
(d) h
Ans. (c)

Ques: In a capillary tube experiment, a vertical 30 cm long capillary tube is dipped in water. The water rises up to a height of 10cm due to capillary action. If this experiment is conducted in a freely falling elevator, the length of the water column becomes
(a) 10 cm
(b) 20 cm
(c) 30 cm
(d) Zero
Ans. (c)

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Ques: Two long capillary tubes A and B of radius RB>RA dipped in same liquid. Then
(a) Water rise is more in A than B
(b) Water rises more in B than A
(c) Same water rise in both
(d) All of these according to the density of water
Ans. (a)

Ques: In a capillary tube, water rises to 3 mm. The height of water that will rise in another capillary tube having one-third radius of the first is
(a) 1 mm
(b) 3 mm
(c) 6 mm
(d) 9 mm
Ans. (d)

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Vishal Arora

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