#5 | Mercury Barometer
(Physics) > Mechanical Properties of Fluids
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The area of cross-section of the wider tube shown in the figure is 800 cm2. If a mass of 12 kg is placed on the massless piston, the difference is heights h in the level of water in the two tubes is :

                                             

1.  10 cm

2.  6 cm

3.  15 cm

4.  2 cm

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If two liquids of same masses but densities ρ1 and ρ2 respectively are mixed, then density of mixture is given by

(a) ρ=ρ1+ρ22                             (b) ρ=ρ1+ρ22ρ1ρ2

(c) ρ=2ρ1ρ2ρ1+ρ2                             (d) ρ=ρ1ρ2ρ1+ρ2

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With rise in temperature, density of a given body changes according to one of the following relations

(a) ρ=ρ01+γ                         (b) ρ=ρ01-γ 

(c) ρ=ρ0γ                                 (d) ρ=ρ0/γ 

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In making an alloy, a substance of specific gravity s1 and mass m1 is mixed with another substance of specific gravity s2 and mass m2 ; then the specific gravity of the alloy is

(a) m1+m2s1+s2                               (b) s1s2m1+m2

(c) m1+m2m1s1+m2s2                            (d) m1s1+m2s2m1+m2

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A silver ingot weighing 2.1 kg is held by a string so as to be completely immersed in a liquid of relative density 0.8. The relative density of silver is 10.5. The tension in the string in kg-wt is
(a) 1.6                                             (b) 1.94
(c) 3.1                                             (d) 5.25

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