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 figure. The lower density liquid is open to atmosphere having pressure P0. Then density D of solid is given by

(1) 54d   
                 
(2) 45d

(3) d     
                   
(4) d5

Subtopic:  Archimedes' Principle |
 70%
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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

Subtopic:  Archimedes' Principle |
 59%
From NCERT
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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-

(1) Remains same                         

(2) Rises

(3) Lowers                                   

(4) (a), (b) or (c)

Subtopic:  Archimedes' Principle |
 50%
From NCERT
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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

(1)Aa2gH1-H2             

(2) 2gh

(3) 2gh(H1-H2)                     

(4) Aag2H1-H2

Subtopic:  Bernoulli's Theorem |
 75%
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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

Subtopic:  Viscosity |
 75%
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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

Subtopic:  Bernoulli's Theorem |
 75%
From NCERT
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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 -

Subtopic:  Viscosity |
 76%
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A liquid does not wet the sides of a solid if the angle of contact is

(1) Zero                                     

(2) Obtuse (More than 90°)

(3) Acute (Less than 90°)           

(4) 90°

Subtopic:  Capillary Rise |
 78%
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The meniscus of mercury in the capillary tube is

(1) Convex           

(2) Concave

(3) Plane               

(4) Uncertain

Subtopic:  Capillary Rise |
 71%
From NCERT
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At which of the following temperatures, the value of surface tension of water is minimum ?

(1) 4°C                                       

(2) 25°C

(3) 50°C                                     

(4) 75°C

Subtopic:  Surface Tension |
From NCERT
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