# NCERT Physics Class 11 Exemplar Ch 10 Mechanical Properties of Fluids Part 1

Q.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., indicate the one that represents the velocity of the pebble as a function of time Velocity vs Time for Pebble- A Velocity vs time for pebble- a Velocity vs Time for Pebble- B Velocity vs time for pebble- b Velocity vs Time for Pebble- C Velocity vs time for pebble- c Velocity vs Time for Pebble- D Velocity vs time for pebble- d

Q.2 Which of the following diagrams (Fig.) does not represent a streamline flow?

Q.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.

Q.4 An ideal fluid flows through a pipe of circular cross-section made of two sections with diameters and . The ratio of the velocities in the two pipes is.

(a)

(b)

(c)

(d)

Q.5 The angle of contact at the interface of water-glass is Ethyl alcohol-glass is Mercury-glass is and Methyliodide glass is 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) ethyl alcohol

(c) mercury

(d) Methyliodide