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Physics

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5. A siphon in use is demonstrated in the following figure. The density of the liquid flowing in siphon is

1.5 gm/cc. The pressure difference between the point P and S will be (a) 105 N/m (b)   2 × 105...

3. An inverted bell lying at the bottom of a lake 47.6 m deep has

50 cm3 of air trapped in it. The bell is brought to the surface of the lake. The volume of...

31. The surface tension for pure water in a capillary tube experiment is

(a) ρg/2hr (b) 2/hrρg (c) rρg/2h (d) hrρg/2 Ans. d (14)

32. 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 (4)

33. Radius of a capillary is

2×10-3m .  A liquid of weight  6.28 x 10-4 N may remain in the capillary then the surface tension of...

34. 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...

36. When a capillary is dipped in water, water

When a capillary is dipped in water, water rises 0.015 m in it. If the surface tension of water is...

8. Equal masses of water and a liquid of density 2 are mixed together, then the mixture has a density of

(a)    2/3                                   ...

11. When a large bubble rises from the bottom of a lake to the surface. Its radius doubles. If atmospheric pressure is equal to that of column of water height H, then the depth of lake is

(a)  H                                     ...

12. The volume of an air bubble becomes three times as it rises from the bottom of a lake to its surface. Assuming atmospheric pressure to be 75 cm of Hg and the density of water to be 1/10 of the density of mercury, the depth of the lake is

(a)  5 m                                   ...

10. The pressure at the bottom of a tank containing a liquid does not depend on

(a)  Acceleration due to gravity (b)   Height of the liquid column (c)   Area of the bottom surface (d)   Nature of...

9. A body of density

d1 is counterpoised by of weights of density d2 in air of density d. Then the true mass of the...

7. Density of ice is

ρ and that of water is σ . What will be the decrease in volume when a mass M of...

29. 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...

4. A uniformly tapering vessel is filled with a liquid of density

900 kg/m3. The force that acts on the base of the vessel due to the liquid is(g=10 m/sec) (a)  3.6...

30. Water rises in a vertical capillary tube upto a height of 2.0 cm . If the tube is inclined at an angle of 60 degree with the vertical, then upto what length the water will rise in the tube

(a)  2.0 cm (b)  4.0 cm (c)  4/√3 cm (d) 2√2 cm Ans. b (5)

19. 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 60 degree with the vertical. The length of the liquid column along the tube is

(a)  9cm (b)  6cm (c)   3cm (d)  2cm Ans. b (71)

17. If the surface tension of water

If the surface tension of water is 0.06 Nm-1, then the capillary rise in a tube of diameter 1 mm...

11. Water rises upto 10 cm height in a long capillary tube. If this tube is immersed in water so that the height above the water surface is only 8 cm, then

(a)  Water flows out continuously from the upper end (b)  Water rises upto upper end and forms a spherical surface...

23. 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 Ans. c (12)

20. The action of a nib split at the top is explained by

(a)  Gravity flow (b)  Diffusion of fluid (c)   Capillary action (d)  Osmosis of liquid Ans. c (17)

21. The correct relation is

(a)   r= 2T cos θ/hdg (b)  r= hdg/2T cos θ (c) r= 2T dgh/cos θ (d) r= T cos θ/2hdg...

22. Water rises upto a height h in a capillary on the surface of earth in stationary condition. Value of h increases if this tube is taken

(a)  On sun (b)  On poles (c)   In a lift going upward with acceleration (d)  In a lift going downward...

25. In a capillary tube, water rises by 1.2 mm. The height of water that will rise in another capillary tube having half the radius of the first, is

(a)  1.2 mm (b)  2.4 mm (c)   0.6 mm (d)  0.4 mm Ans. b (7)

16. 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 (17)

24. A shell having a hole of radius r is dipped in water. It holds the water upto a depth of h then the value of r is

(a)  r= 2T/hdg (b) r= T/hdg (c)  r= Tg/hd (d)  None of these Ans. a (8)

27. If liquid level falls in a capillary then radius of capillary will

(a)  Increase (b)  Decrease (c)   Unchanged (d)  None of these Ans. a (15)

28. Water rises to a height h in a capillary at the surface of earth. On the surface of the moon the height of water column in the same capillary will be

(a)  6h (b) 1/6 h (c)   h (d)  Zero Ans. a (59)

15. By inserting a capillary tube upto a depth l in water, the water rises to a height h. If the lower end of the capillary is closed inside water and the capillary is taken out and closed end opened, to what height the water will remain in the tube

(a)  Zero                                           (b)  l+h (c)   2h                                       (d)  h Ans. d (36)

14. 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...

13. Water rises in a capillary tube when its one end is dipped vertically

Water rises in a capillary tube when its one end is dipped vertically in it, is 3 cm. If the...

12. A vessel, whose bottom has round holes with diameter of 0.1mm, is filled with water. The maximum height to which the water can be filled without leakage is  (S.T. of water =75 dyne/cm, g =1000 cm/s2)

(a)   100 cm                                      (b)  75 cm (c)   50 cm (d)  30 cm Ans. d (46)

10. 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) ...

9. Two capillaries made of the same material with

(a)   7.5 cm                                        (b)  60 cm (c)   15 cm                                 (d)  120 cm Ans. c (14)

4. In the above graph, point D indicates

(a)  Limiting point                              (b)   Yield point (c)   Breaking point                       ...

10. The graph is drawn between the applied force F and the strain (x) for a thin uniform wire. The wire behaves as a liquid in the part

(a)  ab                 (b)   bc (c)   cd                                                          (d)   oa Explanation-    (b)  At point b, yielding of material starts....

4. Two parallel glass plates are dipped partly in the liquid of density ‘d’ keeping them vertical. If the distance between the plates is ‘x’, surface tension for liquids is T and angle of contact is θ, then rise of liquid between the plates due to capillary will be

(a)   T cosθ/xd                                   ...

5. water rises in a capillary tube to a certain height such that the upward force due to surface

Water rises in a capillary tube to a certain height such that the upward force due to surface tension is...

3. 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...

19. The stress-strain curves for brass, steel and rubber are shown in the figure. The lines A, B and C are for

(a)  Rubber, brass and steel respectively (b)   Brass, steel and rubber respectively (c)   Steel, brass and rubber respectively (d)  Steel,...

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