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

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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

Answer: (c)

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

Streamline flow- a

Streamline Flow- A

Streamline flow- b

Streamline Flow- B

Streamline flow- c

Streamline Flow- C

Streamline flow- d

Streamline Flow- D

Answer: (d)

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.

Answer: (b)

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)

Answer: (a)

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

Answer: (c)