(a) The internal pressure of the bubble is always greater than external pressure (b) The internal pressure of the bubble is always equal to external pressure (c) The internal pressure of the bubble is always less than external pressure (d) …
(a) 3.9 N/m (b) 3.9 ×10–2 N/m (c) 3.9 ×10–3 N/m (d) 3.9 dyne/m Ans. b (4)
(a) Internal pressure of the smaller bubble is higher than the internal pressure of the larger bubble (b) Pressure of the larger bubble is higher than the smaller bubble (c) Both bubbles have the same internal pressure (d) None of …
(a) The size of A will increase (b) The size of B will increase (c) The size of B will increase until the pressure equals (d) None of these Ans. a (10)
r1 and r2 equal to 4 cm and 5 cm are touching each other over a common surface s1s2 (shown in figure). Its radius will be (a) 4 cm (b) 20 cm (c) 5 cm (d) 4.5 cm Ans. b …
radius 0.1 mm situated just below the surface of water will be equal to [Take surface tension of water 70 x 10-3 N/m-1 and atmospheric pressure = 1.013 x 105 N/m-2 ] (a) 2.054 x 103 pa (b) 1.027 x …
(a) Equal to atmospheric (b) Equal to upper side pressure (c) More than upper side pressure (d) Lesser than upper side pressure Ans. d (6)
(a) Acceleration due to gravity (b) Height of the liquid column (c) Area of the bottom surface (d) Nature of the liquid Ans.c (7)
(a) 1 : 4 (b) 4 : 1 (c) 16 : 1 (d) 1 : 16 Ans. a (4)
(a) 10m (b) 20m (c) 60m (d) 30m Ans. b (3)
(a) More in the big drop (b) More in the small drop (c) Equal in both drops (d) There is no excess pressure inside the drops Ans. b (4)
(a) The soap film consists of two surface layers of molecules back to back (b) The bubble encloses air inside it (c) The pressure of air inside the bubble is less than the atmospheric pressure; that is why the atmospheric …
(a) Due to surface tension of the oil (b) The wick attracts the kerosene oil (c) Of the diffusion of the oil through the wick (d) None of the above Ans. a (5)
(a) 1 mm (b) 3 mm (c) 6 mm (d) 9 mm Ans. d (8)
(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 (5)
(a) Air flows from larger bubble into the smaller one (b) The size of the bubbles remains the same (c) Air flows from the smaller bubble into the large one and the larger bubble grows at the expense of the smaller …
(a) ρg/2hr (b) 2/hrρg (c) rρg/2h (d) hrρg/2 Ans. d (9)
(a) 10 cm (b) 20 cm (c) 30 cm (d) Zero Ans. c (3)
2×10-3m . A liquid of weight 6.28 x 10-4 N may remain in the capillary then the surface tension of liquid will be (a) 5 x 10-3 N/m (b) 5 x 10-2 N/m (c) 5 N/m (d) 50 N/m …
(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 (11)
the diameter of capillary tube (Surface tension of water = 7.2 ×10–2 N/m) (a) 9.6×10–4 m (b) 9.6×10–3 m (c) 9.6×10–2 m (d) 9.6×10–1 m Ans. a (56)
When a capillary is dipped in water, water rises 0.015 m in it. If the surface tension of water is 75×10–3 N/m, the radius of capillary is (a) 0.1 mm (b) 0.5 mm (c) 1 mm (d) 2 mm Ans. …
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/h2 is (a) 10/9 (b) 3/10 (c) 10/3 (d) 9/10 Ans. …
(a) 2.0 cm (b) 4.0 cm (c) 4/√3 cm (d) 2√2 cm Ans. b (4)
If the surface tension of water is 0.06 Nm-1, then the capillary rise in a tube of diameter 1 mm is (θ=0° ) (a) 1.22 cm (b) 2.44 cm (c) 3.12 cm (d) 3.86 cm Ans. b (11)
(a) Water flows out continuously from the upper end (b) Water rises upto upper end and forms a spherical surface (c) Water only rises upto 6 cm height (d) Water does not rise at all Ans. b (4)
(a) Glass and liquid (b) Air and glass (c) Air and liquid (d) All of Ans. c (11)
(a) Gravity flow (b) Diffusion of fluid (c) Capillary action (d) Osmosis of liquid Ans. c (15)
(a) r= 2T cos θ/hdg (b) r= hdg/2T cos θ (c) r= 2T dgh/cos θ (d) r= T cos θ/2hdg (13)
(a) On sun (b) On poles (c) In a lift going upward with acceleration (d) In a lift going downward with acceleration Ans. d (5)
(a) 1.2 mm (b) 2.4 mm (c) 0.6 mm (d) 0.4 mm Ans. b (5)
(a) Twice (b) Half (c) Same as earlier (d) None of these Ans. b (10)
(a) r= 2T/hdg (b) r= T/hdg (c) r= Tg/hd (d) None of these Ans. a (7)
(a) Increase (b) Decrease (c) Unchanged (d) None of these Ans. a (13)
(a) 6h (b) 1/6 h (c) h (d) Zero Ans. a (57)
(a) Zero (b) l+h (c) 2h (d) h Ans. d (35)