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
A wooden cube just floats inside water when a 200gm mass is placed on it. When the mass is removed, the cube is 2 cm above the water level. The size of the cube is
  • A
    5 cm
  • B
    15 cm
  • C
    20 cm
  • D
    10 cm
    Correct
2
Pressure applied to an enclosed fluid is
  • A
    diminished and transmitted to the wall of the container
  • B
    transmitted unchanged to every portion of the fluid and walls of the containing vessel
    Correct
  • C
    increased and applied to every part of the fluid
  • D
    increased in proportion to the mass of the fluid and then transmitted
3
A parrot is in a wire case, which is hanging from a spring balance. Initially the parrot sits in the cage and in the second instant the parrot flies inside the cage
  • A
    the reading will remain unchanged
  • B
    the reading of the balance will be lesser when the parrot flies in the cage
    Correct
  • C
    the reading of the balance will be greater when the parrot flies in the cage
  • D
    None of the above
4
If there would be smaller gravitational effects, which of the following forces do you think would alter in some respect?
  • A
    Electrostatic forces
  • B
    Viscous forces
  • C
    Buoyant forces
    Correct
  • D
    Nuclear forces
5
If you float on your back on water, your weight is
  • A
    greater than the weight of water you displace
  • B
    half to your normal weight
  • C
    Zero
    Correct
  • D
    equal to your normal weight
6
The height of mercury column in a simple barometer is h. As tube is inclined to the vertical at an angle \( \propto \) the length of the mercury column along the length of the tube is l, then
  • A
    l = h
  • B
    l = h sin\( \propto \)
  • C
    l = h cos\( \propto \)
  • D
    l = h/cos\( \propto \)
    Correct
7
A cylindrical vessel is filled with equal mass of mercury and water. The over all height of the two layers is 43.8 cm. Relative density of mercury is 13.6. Then the pressure of the liquid on the bottom of the vessel is
  • A
    3 cm of Hg
  • B
    16.6 cm of Hg
  • C
    1.5 cm of Hg
  • D
    6 cm of Hg
    Correct
8
Two bodies are in equilibrium when suspended in water from the arms of a balance. The mass of one body is 36 gm and its density is 9 gm/cc. If the mass of the other is 48 gm, its density in gm/cc is
  • A
    4/3
  • B
    3.0
    Correct
  • C
    5
  • D
    3/2
9
Three liquids of densities d, 2d and 3 d are mixed in equal volumes. Then the density of mixture is
  • A
    5d
  • B
    2d
    Correct
  • C
    d
  • D
    3d
10
Three liquids of densities d, 2d and 3d are mixed in equals proportions of weights. The relative density of the mixture is
  • A
    11/7d
  • B
    23/18d
  • C
    13/9d
  • D
    18/11d
    Correct
11
A piece of metal of specific gravity 3.4 floats in mercury of specific gravity 13.6. what fraction of its volume is under mercury?
  • A
    0.75
  • B
    0.50
  • C
    0.25
    Correct
  • D
    0.80
12
Which one of the following statements is correct for a fluid passing through the narrow part of non-uniform pipe?
  • A
    its velocity increases but its pressure decreases
    Correct
  • B
    its velocity and pressure both decrease
  • C
    its velocity and pressure both increase
  • D
    its velocity decreases but its pressure increases
13
A cylindrical jar of cross-sectional area 0.01 \({{\rm{m}}^{\rm{2}}}\) is filled with water to a height of 50 cm. It carries a tight-fitting piston of negligible mass. What is the pressure at the bottom of the jar when mass of 1 kg is placed on the piston? Take g = 10m \({{\rm{s}}^{ - {\rm{2}}}}\)
  • A
    4000 Pa
  • B
    2000 Pa
  • C
    6000 Pa
    Correct
  • D
    5000 Pa
14
Two vessels A and B of different shapes have the same base area and are filled with water up to the same height h. The force exerted by water on the base is \({{\rm{F}}_{\rm{A}}}\) for vessel A and \({{\rm{F}}_{\rm{B}}}\) for vessel B. The respective weights of the vessels are \({{\rm{W}}_{\rm{A}}}\) and \({{\rm{W}}_{\rm{B}}}\). Then
Question 14 figure 1
  • A
    \({{\rm{F}}_{\rm{A}}} = {\rm{ }}{{\rm{F}}_{\rm{B}}};{\rm{ }}{{\rm{W}}_{\rm{A}}} > {{\rm{W}}_{\rm{B}}}\)
    Correct
  • B
    \({{\rm{F}}_{\rm{A}}} > {\rm{ }}{{\rm{F}}_{\rm{B}}};{\rm{ }}{{\rm{W}}_{\rm{A}}} > {{\rm{W}}_{\rm{B}}}\)
  • C
    \({{\rm{F}}_{\rm{A}}} = {\rm{ }}{{\rm{F}}_{\rm{B}}};{\rm{ }}{{\rm{W}}_{\rm{A}}} = {{\rm{W}}_{\rm{B}}}\)
  • D
    \({{\rm{F}}_{\rm{A}}} = {\rm{ }}{{\rm{F}}_{\rm{B}}};{\rm{ }}{{\rm{W}}_{\rm{A}}} > {{\rm{W}}_{\rm{B}}}\)
15
A tank with a square base of area 2.0 m\(^{\rm{2}}\) is divided into two compartments by a vertical partition in the middle. There is a small hinged door of face area20 cm\(^{\rm{2}}\) at the bottom of the partition. Water is filled in one compartment and an acid, of relative density 1.5, in the other, both to a height of 4m. If g = 10 \({\rm{m}}{{\rm{s}}^{ - {\rm{2}}}}\) the force necessary to keep the door closed is
  • A
    80 N
  • B
    40 N
    Correct
  • C
    20 N
  • D
    10 N