(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)
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. …
(a) 2/3 (b) 4/3 (c) 3/2 (d) 3 Answer-b (3)
(a) 5 m (b) 10 m (c) 15 m (d) 20 m Answer-c (24)
(a) Acceleration due to gravity (b) Height of the liquid column (c) Area of the bottom surface (d) Nature of the liquid Answer-c (8)
d1 is counterpoised by of weights of density d2 in air of density d. Then the true mass of the body is (a) M …
ρ and that of water is σ . What will be the decrease in volume when a mass M of ice melts (a) M/( σ – ρ ) …
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. …
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 N (b) 7.2 N (c) 9.0 N (d) 14.4 N Answer-b (83)
(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 (4)
(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 (56)
(a) Zero (b) l+h (c) 2h (d) h Ans. d (35)
(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 (8)
Water rises in a capillary tube when its one end is dipped vertically in it, is 3 cm. If the surface tension of water is 75 × 10-3 N/m, then the diameter of capillary will be (a) 0.1 mm (b) …
(a) 100 cm (b) 75 cm (c) 50 cm (d) 30 cm Ans. d (42)
(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 (24)
(a) 7.5 cm (b) 60 cm (c) 15 cm (d) 120 cm Ans. c (13)
(a) Limiting point (b) Yield point (c) Breaking point (d) None of the above Answer-c (6)
(a) ab (b) bc (c) cd (d) oa Explanation- (b) At point b, yielding of material starts. (44)
(a) T cosθ/xd (b) 2T cosθ/xdg (c) 2T/xdg cosθ …
Water rises in a capillary tube to a certain height such that the upward force due to surface tension is balanced by 75 X 10-4 N force due to the weight of the liquid. If the surface tension of 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 …
(a) Rubber, brass and steel respectively (b) Brass, steel and rubber respectively (c) Steel, brass and rubber respectively (d) Steel, rubber and brass respectively Answer-c (7)
(a) Sand R (b) T and S (c) R and S (d) S and T Answer-d (25)
(a) A is brittle but B is ductile (b) A is ductile and B is brittle (c) Both A and B are ductile (d) Both A and B are brittle Explanation-(b) In ductile materials, yield point exist while in …