Mechanical Properties Of Fluids CBSE Questions & Answers

Mechanical Properties Of Fluids

This is Physics Class 11 Mechanical Properties of Fluids CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
The basic property of a fluid that makes it different from solids
  • A
    it can be compressed
  • B
    it has a large density
  • C
    it does not expands very little on heating
  • D
    is that it can flow
    Correct
2
Density is defined as
  • A
    volume of 1 kg of the material
  • B
    volume per unit mass
  • C
    volume of 10 kg of the material
  • D
    mass per unit volume
    Correct
3
The specific gravity of a material is
  • A
    none of these
  • B
    the ratio of its mass to the density of water
  • C
    the ratio of its density to the density of water
    Correct
  • D
    the ratio of its volume to the density of water
4
Pressure p at any point in a fluid is
  • A
    the normal force at that point per unit volume
  • B
    the force parallel to area at that point per unit area
  • C
    the normal force at that point per unit mass
  • D
    the normal force at that point per unit area
    Correct
5
According to Pascal’s Law the
  • A
    pressure in a fluid decreases with temperature
  • B
    pressure in a fluid at rest is the same at all points if they are at different heights
  • C
    pressure in a fluid increases with temperature
  • D
    pressure in a fluid at rest is the same at all points if they are at the same height
    Correct
6
The pressure at a depth of h in a fluid of density \(\rho \) at a place where the acceleration due to gravity is g and the pressure at h=0 is \({{\rm{p}}_0}\) is given by
  • A
    p = \(\rho \) gh
  • B
    p = \({{\rm{p}}_0}\)+ \(3\rho \) gh
  • C
    p = \({{\rm{p}}_0}\) + \(\rho \) gh
    Correct
  • D
    p = \({{\rm{p}}_0}\) + \(2\rho \) gh
7
The units of pressure in SI system is
  • A
    Newton
  • B
    Watt
  • C
    Joule
  • D
    Pascal
    Correct
8
Gauge pressure at a point is
  • A
    pressure at that point + atmospheric pressure
  • B
    pressure at that point – atmospheric pressure
    Correct
  • C
    (pressure at that point – atmospheric pressure)/2
  • D
    (pressure at that point + atmospheric pressure)/2
9
According to Pascal’s law for transmission of fluid pressure
  • A
    external pressure applied on any part of a fluid contained in a vessel is transmitted decreased in all directions
  • B
    external pressure applied on any part of a fluid contained in a vessel is transmitted undiminished and equally in all directions
    Correct
  • C
    external pressure applied on any part of a fluid contained in a vessel is transmitted increased in all directions
  • D
    external pressure applied on any part of a fluid contained in a vessel is not transmitted in all directions
10
In a hydraulic lift the force applied on the smaller cylinder of area A1 is F1. If the area of the larger cylinder is A2 the maximum weight that can be lifted is
  • A
    \({{\rm{F}}_{\rm{1}}}{{\rm{A}}_{\rm{2}}}\)
  • B
    \({F_1}\)
  • C
    \({{{A_2}} \over {{A_1}}}{F_1}\)
    Correct
  • D
    \({{{A_1}} \over {{A_2}}}{F_1}\)
11
The stream line in a flow is
  • A
    a curve whose tangent at any point is in the direction of the fluid velocity at that point
    Correct
  • B
    a curve which shows all points of equal pressure
  • C
    a curve which shows all points of equal velocity
  • D
    a curve whose perpendicular at any point is in the direction of the fluid velocity at that point
12
Flow is said to be steady if
  • A
    the flow rate increases with time
  • B
    the flow rate decreases 20\(\% \) every second
  • C
    the flow rate decreases 10\(\% \) every second
  • D
    the flow rate does not change with time
    Correct
13
If a pipe carrying incompressible liquid has an area \({{\rm{A}}_{\rm{1}}}\) and velocity \({{\rm{v}}_{\rm{1}}}\) at one point \({{\rm{A}}_{\rm{2}}}\) and \({{\rm{v}}_{\rm{2}}}\) at another point, the equation of continuity gives the relation
  • A
    \({{\rm{A}}_{\rm{1}}}\) = \({{\rm{A}}_{\rm{2}}}\) \({{\rm{v}}_{\rm{2}}}\)
  • B
    \({{\rm{A}}_{\rm{1}}}\) \({{\rm{v}}_{\rm{1}}}\) = \({{\rm{A}}_{\rm{2}}}\)
  • C
    \({{\rm{A}}_{\rm{1}}}\)\({{\rm{v}}_{\rm{1}}}\) = \({{\rm{A}}_{\rm{2}}}\) \({{\rm{v}}_{\rm{2}}}\)
    Correct
  • D
    \({{\rm{A}}_{\rm{1}}}\) \({{\rm{v}}_{\rm{1}}}\) =2 \({{\rm{A}}_{\rm{2}}}\) \({{\rm{v}}_{\rm{2}}}\)
14
in laminar flow
  • A
    adjacent layers of fluid move in circle crossing each other each other and the flow is steady
  • B
    adjacent layers of fluid slide smoothly past each other and the flow is steady
    Correct
  • C
    adjacent layers of fluid do not slide smoothly past each other and the flow is unsteady
  • D
    adjacent layers of fluid slide smoothly past each other and the flow is unsteady
15
At large flow velocities the flow of a fluid becomes
  • A
    viscous
  • B
    laminar
  • C
    turbulent
    Correct
  • D
    compressible