Exam (elaborations)
Chapter Ten MECHANICAL PROPERTIES OF FLUIDS
Chapter Ten MECHANICAL PROPERTIES OF FLUIDS
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Exemplar Problems–PhysicsChapter Ten
MECHANICAL
PROPERTIES OF
FLUIDS
MCQ I
10.1 A tall cylinder is filled with viscous oil. A round pebble is dropped
from the top with zero initial velocity. From the plot shown in
Fig. 10.1, indicate the one that represents the velocity (v) of the
pebble as a function of time (t).
v v v v
t t t t
(a) (b) (c) (d)
Fig. 10.1
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, Mechanical Properties of Fluids
10.2 Which of the following diagrams (Fig. 10.2) does not represent a
streamline flow?
Fig. 10.2
10.3 Along a streamline
(a) the velocity of a fluid particle remains constant.
(b) the velocity of all fluid particles crossing a given position is
constant.
(c) the velocity of all fluid particles at a given instant is constant.
(d) the speed of a fluid particle remains constant.
10.4 An ideal fluid flows through a pipe of circular cross-section made
of two sections with diameters 2.5 cm and 3.75 cm. The ratio of
the velocities in the two pipes is
(a) 9:4
(b) 3:2
(c) 3: 2
(d) 2: 3
10.5 The angle of contact at the interface of water-glass is 0°,
Ethylalcohol-glass is 0°, Mercury-glass is 140° and Methyliodide-
glass is 30°. A glass capillary is put in a trough containing one of
these four liquids. It is observed that the meniscus is convex. The
liquid in the trough is
(a) water
(b) ethylalcohol
(c) mercury
(d) methyliodide.
MCQ II
10.6 For a surface molecule
(a) the net force on it is zero.
(b) there is a net downward force.
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