When the system shown in the adjoining figure is in equilibrium and if the areas of cross section of the smaller piston and bigger piston are a and 10 a mass on smaller and bigger pistons are  m amd M, then

1. m=M

2. m= 10M

3. M= 10 m

4. M= 100 m

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A wooden block, with a coin placed on its top, floats in water as shown in fig. the distance l and h are shown there. After some time the coin falls into the water. Then

1. l decreases and h increases

2. l increases and h decreases

3. Both l and h increase

4. Both l and h decrease

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What is the velocity v of a metallic ball of radius r failing in a tank of liquid at the instant when its acceleration is one-half that of a freely falling body? (The densities of metal and of liquid are ρ and σ respectively, and the viscosity of the liquid is h)

1. r2g9η(ρ-2σ)

2. r2g9η(2ρ-σ)

3. r2g9η(ρ-σ)

4. 2r2g9η(ρ-σ)

5. r2g18η(ρ-2σ)

Level 3: 35%-60%
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A tank is filled with water upto a height H. Water is allowed to come out of a hole P in one pf the walls at a depth D below the surface of water. Express the horizontal distance x in terms of H and D

1. x=D(H-D)

2. x=D(H-D)2

3. x=2D(H-D)

4. x=4D(H-D)

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Level 2: 60%+
PMT - 2004
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A U-tube od uniform cross section as shown in figure is partially filled with a liquid I. Another liquid II which does not mix with liquid I is poured into one side. It is found that the liquid levels of the two sides of the tube are the same, while the level of liquid I has risen by 2cm. If the specific gravity of liquid I is 1.1 the specific gravity of liquid II must be
                        

1. 1.12

2. 1.1

3. 1.05

4. 1.0

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Level 3: 35%-60%
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A tube of length h (which is wide enough so that surface tension effects can be neglected) is filled with air and closed at one end is lowered into a tank of mercury to a depth h as shown; so that mercury rises a distance x into the tube. If the mercury barometer also reads 'h', then
                               

1. h (h-x)=h2

2. (2h-x) (h-x)=h2

3. (2h-x) (h+x)=h2

4. (2h) (h-x)=h2

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A U-tube of base length I filled with same volume of two liquids of densities ρ and 2ρ is moving with an acceleration a on the horizontal plane. If the height difference between the two surfaces fopen to atmosphere) becomes zero, then height h is given by

1. alg

2. 3al2g

3. 2al3g

4. al2g

 

Level 3: 35%-60%
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A faulty barometer contains some air which occupies 9.5 cc. If indicates 740 mm when a correct barometer indicates 750 mm, the volume the air would occupy under standard pressure

1. 0.0.95 cc

2. 0.125 cc

3. 1.25 cc

4. 12.5 cc

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A hole is made at the bottom of the tank filled with water (density= 1000 kg/m3). If the total pressure at the botton of the tand is three atmoshphere (1 atmosphere = 105 N/m2), then the velocity of efflux is

1. 400m/s

2. 200m/s

3. 6400m/s

4. 500m/s

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Kerosene oil rises up in the wick of a lantern because of

1. diffusion of the oil through the wick

2. surface tension

3. buoyant force of air

4. the gravitational pull of the wick

Level 4: Below 35%
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