(a) 4 : 9 (b) 9 : 4 (c) 8 : 27 (d) 1 : 1 Answer-a (12)
(a) Gravity to viscous force (b) Gravity force to pressure force (c) Inertia forces to viscous force (d) Viscous forces to pressure forces Answer-c (22)
(a) Zero (b) Maximum (c) In between zero and maximum (d) Equal to critical velocity Answer-a (4)
T1 and T2. Their lengths are l1 and l2 and radii of cross-section are r1 and r2 The rate of flow of water under a pressure difference P through tube T1 is 8cm3/sec. If l1 = 2l2 and r1 =r2, …
(a) 10 cm per sec (b) 2.5 cm per sec (c) 5×4¹/3 per sec (d) 5×√2 per sec Answer-c (2)
(a) V/16 (b) V/17 (c) 16V/17 (d) …
(a) (2/9)r2[(1- ρ)/η]g (b) (2/81)r2[(ρ- 1)/η]g (c) (2/81)r4[(ρ- 1)/η]2 g (d) (2/9)r4[(ρ- 1)/η]2 g Answer-c (5)
(a) No change (b) It will rise (c) It will fall (d) It may rise or fall depending on the density of block Explanation- (a) Since no change in volume of displaced water takes place, hence level of water remains …
(a) Greater than the work done by air friction in the second 100 m (b) Less than the work done by air friction in the second 100 m (c) Equal to 100 mg (d) Greater than 100 mg Answer-b (11)
‘η‘ with a velocity ‘v‘. The retarding viscous force acting on the spherical ball is (a) Inversely proportional to ‘r‘ but directly proportional to velocity ‘v‘ (b) Directly proportional to both radius ‘r‘ and velocity ‘v‘ (c) Inversely proportional to …
(a) 0.1 (b) 0.05 (c) 0.005 (d) 0.0005 Answer-d (2)
70 cm3/sec. then the maximum height up to which water can rise in the tank is (a) 2.5 cm (b) 5 cm (c) 10 cm …
(1 atm = 105N/m2) then the velocity of water flowing from hole is (a) √400 m/s (b) √600 m/s (c) √60 m/s …
3.5 × 105 N/m2. When the valve is opened, the reading of manometer falls to 3.0 × 105 N/m2, then velocity of flow of water is (a) 100 m/s (b) 10 m/s (c) 1 m/s …
5.18 ms–1 through a pipe with a cross-sectional area of 4.20 cm2. The water gradually descends 9.66 m as the pipe increase in area to 7.60 cm2. The speed of flow at the lower level is (a) 3.0 ms–1 (b) …
kg per metre3 and the wing is 10 m long and has an average width of 2 m, then the difference of the pressure on the two sides of the wing of (a) 4095.0 Pascal (b) 409.50 Pascal (c) 40.950 …
(a) Height of the liquid in the tube A is maximum (b) Height of the liquid in the tubes A and B is the same (c) Height of the liquid in all the three tubes is the same (d) Height …
If g=10 m/s2 then the velocity head of oil will be (a) 1.25 m (b) 12.5 m (c) 0.125 m …
0.4 × 103 kg/m3 falls into water from a height of 9 cm . To what depth does the ball sink (a) 9 cm (b) 6 cm (c) 4.5 cm …
ρ in a vertical plane with its base on the surface of the liquid. The thrust on the lamina is (a) (1/2) Aρgh …
(a) ρ= ρ0 [1+ (λd θ)] (b) ρ= ρ0 [1- (λd θ)] (c) ρ= ρ0 λd θ …
ρ of water of bulk modulus B at a depth y in the ocean is related to the density at surface ρ0 by the relation (a) ρ= ρ0[1-(ρ0 gy/B)] (b) ρ= ρ0[1+(ρ0 …
ρ1 and ρ2 are mixed, then density of mixture is given by (a) ρ= (ρ1 + ρ2) /2 (b) ρ= (ρ1 + ρ2) …
(a) d (b) 2d (c) 3d (d) 5d Answer-b (2)
(a) The pressure on the bottom of tank (a) is greater than at the bottom of (b). (b) The pressure on the bottom of the tank (a) is smaller than at the bottom of (b) (c) The pressure depend on …
(a) Increase on sides (b) Increase downwards (c) Increase in all directions (d) Never increases Answer-c (2)
(a) Metal is 3 (b) Metal is 7 (c) Liquid is 3 (d) Liquid is 1/3 Answer-b,c (6)
(a) 6 × 5 × 5 × 5 gf (b) 4 × 4 × 4 × 7 gf (c) 5 × 5 × 5 × 7 gf …
(a) It will slowly come back to its earlier position (b) It will remain submerged, where it is left (c) It will sink (d) It will come out violently Answer-b (5)
η ( > 1) times lighter than water is suspended in a water tank by a string tied to its base as shown in fig. If the mass of the sphere is m then the tension in the string is given …
(a) Increases (b) Decreases (c) Remains unchanged (d) None of these Answer-b (30)
(a) Bernoulli (b) Archimedes (c) Boyle (d) Pascal Answer-d (3)
v0 and density d0 above the surface of a liquid of density d will be (a) d0 /d (b) (d …