A homogeneous solid cylinder of length L(L<H/2) . Cross-sectional area A/5 is immersed such that it floats with its axis vertical at the liquid-liquid interface with length L/4 in the denser liquid as shown in the fig. The lower density liquid is open to atmosphere having pressure P0. Then density D of solid is given by

(a) 54d                      (b) 45d

(c) d                          (d) d5

Concept Questions :-

Archimedes principle
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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

(a) l decreases and h increases

(b) l increases and h decreases

(c) Both l and h increase

(d) Both l and h decrease

Concept Questions :-

Archimedes principle
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A block of ice floats on a liquid of density 1.2 g/cm3 in a beaker. Then level of liquid when ice completely melts-

(a) Remains same                         (b) Rises
(c) Lowers                                    (d) (a), (b) or (c)

Concept Questions :-

Archimedes principle
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A vessel of area of cross-section A has liquid to a height H. There is a hole at the bottom of vessel having area of cross-section a. The time taken to decrease the level from H1 to H2 will be

(a)Aa2gH1-H2              (b) 2gh

(c) 2gh(H1-H2)                      (d) Aag2H1-H2

Concept Questions :-

Bernoulli theorem
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A lead shot of 1mm diameter falls through a long column of glycerine. The variation of its velocity v with distance covered is represented by

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Water flows through a frictionless duct with a cross-section varying as shown in fig. Pressure p at points along the axis is represented by

Concept Questions :-

Bernoulli theorem
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From amongst the following curves, which one shows the variation of the velocity v with time t for a small sized spherical body falling vertically in a long column of a viscous liquid -

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A liquid does not wet the sides of a solid if the angle of contact is

(a) Zero                                     (b) Obtuse (More than 90°)
(c) Acute (Less than 90°)            (d) 90°

Concept Questions :-

Surface tension
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The meniscus of mercury in the capillary tube is

(a) Convex            (b) Concave
(c) Plane               (d) Uncertain

Concept Questions :-

Capillary rise
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At which of the following temperatures, the value of surface tension of water is minimum ?

(a) 4°C                                       (b) 25°C
(c) 50°C                                     (d) 75°C

Concept Questions :-

Surface tension
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