(a) 18 π ergs (b) 180 π ergs (c) 1800 π ergs (d) 8000 π ergs Ans. c (4)
(a) W/2 (b) 2W (c) 4W (d) (7/3) W Ans. c (26)
(a) 5 x 102 j (b) 2.5 x 10-2 j (c) 2 x 10-1 (d) 5 x 10-1 j Ans. c (5)
(a) 2 πD2T (b) 4 πD2T (c) 6 πD2T (d) 8 πD2T Ans. c (8)
(a) 4π(D2-d2)T (b) 8π(D2-d2)T (c) π(D2-d2)T (d) 2π(D2-d2)T Ans. d (6)
(a) 2 πR2T (b) 3 πR2T (c) 4 πR2T (d) 2 πR2T Ans. c (30)
into 106 droplets is (Surface tension of water= 72 x 10-3 J/m2 (a) 9.58 x 10-5 j (b) 8.95 x 10-5 j (c) 5.89 x 10-5 j (d) 5.98 x 10-6 j Ans. b (251)
(a) 4πT(nr2-R2) (b) (4/3)π(r3n-R2) (c) 4πT(R2-nr2) (d) 4πT(nr 2 + R2) Ans.a (4)
(a) Zero (b) Smaller (c) The same (d) Greater Ans. d (7)
(a) Energy is liberated (b) Energy is absorbed (c) Neither liberated nor absorbed (d) Some mass is converted into energy Ans. a (6)
(a) Zero (b) 19 erg (c) 46 erg (d) 74 erg Ans. d (3)
(a) Acute angle (b) Obtuse angle (c) 90° (d) 0° Ans. (d) Tangent drawn at point of contact makes 0° with wall of container. (8)
(a) Water and glass; glass and mercury (b) Pure water and glass; glass and alcohol (c) Silver and water; mercury and glass (d) Silver and chromium; water and chromium Ans. (b) Both liquids water and alcohol have same nature (e. …
(a) Concave upward (b) Convex upward (c) Concave downward (d) Convex downward Ans. (b) Since for such liquid (Non-wetting) angle of contact is obtuse. (11)
(a) Flat (b) Concave (c) Convex (d) Cylindrical Ans. b (6)
of 00 angle of contact (a) Plane (b) Parabolic (c) Semi-spherical (d) Cylindrical Ans. c (10)
(a) 0° (b) 900 (c) 450 (d) 330 Ans. a (30)
(a) Greater than (b) Less than 90° (c) Equal to 90° (d) Equal to 0° Ans. a (2)
(a) Increase (b) Remain unchanged (c) Increase or decrease (d) Decrease Ans. b (5)
(a) r (b) r2 (c) r-1 (d) r-2 Ans. c (6)
r1 and r2(r2>r1) coalesce, the radius of curvature of common surface is (a) r2-r1 (b) r2-r1/r1r2 (c) r1r2/ r2-r1 (d) r2 +r1 Ans. c (8)
25 x 10-3 Nm-1 . The excess pressure inside a soap bubble of diameter 1 cm is (a) 10 Pa (b) 20 Pa (c) 5 Pa (d) None of the above Ans. b (9)
(a) 100 dyne/cm (b) 68.66 dyne/cm (c) 137 dyne/cm (d) 150 dyne/cm Ans. b (40)
(a) Less than 40 N/m2 (b) Greater than 40 N/m2 (c) Less than 20 N/m2 (d) Greater than 20 N/m2 Ans. b (3)
(a) 2T/r (b) 4T/r (c) T/2r (d) T/r Ans. b (4)
A, B and C prepared by blowing the capillary tube fitted with stop cocks, S1, S2 and S3. With stop cock S closed and stop cocks S1, S2 and S3 opened (a) B will start collapsing with volumes of A …
are r1 and r2. In isothermal conditions, two meet together in vaccum. Then the radius of the resultant bubble is given by (a) R= (r1+r2)/2 (b) R= r1 (r1 r2+r2) (c) R2 = r21+r22 (d) R= r1+r2 Ans. c (9)
(a)(S/r) cos θ (b) (2S/r) cos θ (c) S/r cos θ (d) 2S/r cos θ Ans. b (7)
(a) 102 : 101 (b) (102)3 : (101)3 (c) 8 : 1 (d) 2 : 1 Ans. c (26)
(a) 1 : 64 (b) 1 : 4 (c) 64 : 1 (d) 1 : 2 Ans. a (8)
(a) 2.3 cm (b) 4.5 cm (c) 5 cm (d) 7 cm Ans. c (36)
water is 70 x 10-3 N/m difference of pressures between inside and out side of the spherical drop is (a) 35 N/m2 (b) 70 N/m2 (c) 140 N/m2 (d) Zero Ans. c (21)
(a) Acute (b) Obtuse (c) Zero (d) 900 Ans. b (8)
(a) 0° (b) 30o (c) 90o (d) 135o Ans. d (6)
(a) Increases (b) Decreases (c) Remains the same (d) First increases and then decreases Ans. b (7)
(a) Convex (b) Concave (c) Plane (d) Uncertain Ans. a (4)
(a) Zero (b) Obtuse (More than 90°) (c) Acute (Less than 90°) (d) 90° Ans. b (8)
(a) 1 : 3 (b) 1 : 9 (c) 27 : 1 (d) 1 : 27 Ans. d (4)