CBSE Class 11 Physics Mechanical Properties Of Fluids Worksheet Set B

Question- An ornament weighing 36 g in air weighs only 34 g in water. Assuming that some copper is mixed with gold to prepare the ornament, find the amount of copper in it. Specific gravity of gold is 19.3 and that of copper is 8.9.

Question- It is equidistant from the two stationary plates then the force exerted by the liquid on the plate is approximately :

Question- In Bernoulli’s theorem which of the following is conserved?

(a) Mass

(b) Linear momentum

(c) Energy

(d) Angular momentum

Answer-(c)

Question-Pressure applied to enclosed fluid is

(a) increased and applied to every part of the fluid

(b) diminished and transmitted to wall of container

(c) increased in proportion to the mass of the fluid and then transmitted

(d) transmitted unchanged to every portion of the fluid and wall of containing vessel.

Answer-(d)

Question-The device which measures the flow speed of incompressible fluid is

(a) sphygmomanometer

(b) open-tube manometer

(c) venturimeter

(d) mercury barometer

Answer-(c)

Question-After terminal velocity is reached, the acceleration of a body falling through a fluid is

(a) equal to g

(b) zero

(c) less than g

(d) greater than g

Answer-(b)

Question- Bernoulli’s equation is important in the field of

(a) electrical circuits

(b) magnetism

(c) flow of fluids

(d) photoelectric effect

Answer-(c)

Question-Which of the following is a unit of pressure?

(a) atm

(b) pascal

(c) bar

(d) All of these

Answer-(d)

Question- Magnus effect is very near to the

(a) magnetic field

(b) electric field

(c) bernoulli’s theorem

(d) magnetic effect of current

Answer-(c)

Question-Liquid pressure depends upon

(a) area of the liquid surface

(b) shape of the liquid surface

(c) height of the liquid column

(d) directions

Answer-(c)

Question-Toricelli’s theorem is used to find

(a) the velocity of efflux through an orifice.

(b) the velocity of flow of liquid through a pipe.

(c) terminal velocity

(d) critical velocity

Answer-(a)

Question-According to archimedes' principle, loss of weight of a body immersed in a liquid is equal to

(a) weight of the liquid displaced

(b) weight of the total liquid

(c) weight of the body

(d) None of these

Answer-(a)

Question-When a body is wholly or partially immersed in a fluid at rest, the force working on it in upward direction is called

(a) buoyant force

(b) surface tension

(c) viscous force

(d) None of these

Answer-(a)

Question-The pressure at the bottom of a tank containing a liquid does not depend on

(a) acceleration due to gravity

(b) height of the liquid column

(c) area of the bottom surface

(d) nature of the liquid

Answer-(c)

Question-Beyond the critical speed, the flow of fluids becomes

(a) streamline

(b) turbulent

(c) steady

(d) very slow

Answer-(b)

Question-Streamline flow is more likely for liquids with

(a) high density and low viscosity

(b) low density and high viscosity

(c) high density and high viscosity

(d) low density and low viscosity

Answer-(b)

Question-The most characteristic property of a liquid is

(a) elasticity

(b) fluidity

(c) formlessness

(d) volume conservation

Answer-(d)

Question-For flow of a fluid to be turbulent

(a) fluid should have high density

(b) velocity should be large

(c) reynold number should be less than 2000

(d) both (a) and (b)

Answer-(d)

Question-Hydraulic lifts and hydraulic brakes are based on

(a) Archimedes' principle

(b) Bernoulli's principle

(c) Stoke's law

(d) Pascal's law

Answer-(d)

Question- In a stream line (laminar flow) the velocity of flow at any point in the liquid

(a) does not vary with time

(b) may vary in direction but not in magnitude

(c) may vary in magnitude but not in direction

(d) may vary both in magnitude and direction

Answer-(a)

Question- _________ and _________ play the same role in case of fluids as force and mass play in case of solids.

(a) Thrust and density

(b) Pressure and density

(c) Pressure and thrust

(d) thrust and volume

Answer-(b)

Question-Paint-gun is based on

(a) Bernoulli’s theorem

(b) Archimedes’ principle

(c) Boyle’s law

(d) Pascal’s law

Answer-(a)

Question-Specific gravity of a body is numerically equal to

(a) weight of the body in air

(b) weight of the body in water

(c) relative density of the body

(d) density of body in water

Answer-(c)

Question-A liquid is allowed to flow into a tube of truncated cone shape. Identify the correct statement from the following:

(a) the speed is high at the wider end and high at the narrow end.

(b) the speed is low at the wider end and high at the narrow end.

(c) the speed is same at both ends in a stream line flow.

(d) the liquid flows with uniform velocity in the tube.

Answer-(a)

Question-As the temperature of a liquid is raised, the coefficient of viscosity

(a) decreases

(b) increases

(c) remains the same

(d) may increase or decrease depending on the nature of liquid

Answer-(a)

Question-Which of the following pressure-measuring device measures the guage pressure?

(a) Mercury barometer

(b) Sphygmomanometer

(c) Both (a) & (b)

(d) None of these

Answer-(b)