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

Concept Questions :-

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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 -

Concept Questions :-

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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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If a glass rod is dipped in mercury and withdrawn out, the mercury does not wet the rod because 

(a) Angle of contact is acute

(b) Cohesion force is more

(c) Adhesion force is more

(d) The density of mercury is more

Concept Questions :-

Surface tension
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