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CBSE Class 11 (Science) Mechanical Properties of Solids and Fluids — practice questions — page 8

Explore 257 free Mechanical Properties of Solids and Fluids questions in CBSE Class 11 (Science) Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Mechanical Properties of Solids and Fluids questions and exercises with answers

Showing questions 211–240 of 257.

What fills the space above the mercury column in a barometer tube?Read the answer and worked solution →A hydraulic lift piston has 50 times the area of the small one. What force does 100 N give?Read the answer and worked solution →Hydraulic brakes in cars depend on which principle?Read the answer and worked solution →Water flows at 2 m/s in a pipe of area 4 cm^2 into a section of area 1 cm^2. What is the speed there?Read the answer and worked solution →Bernoulli's equation is essentially which law applied to fluid motion?Read the answer and worked solution →Bernoulli's equation fails for which type of flow?Read the answer and worked solution →Why can two streamlines in steady flow never cross?Read the answer and worked solution →Above the critical speed, streamline flow of a fluid becomes what?Read the answer and worked solution →In laminar flow, the velocities at different points have which feature?Read the answer and worked solution →What does the word efflux mean in Torricelli's law?Read the answer and worked solution →A tank has a small hole 5 m below the water surface. Take g = 10 m/s^2. What is the efflux speed?Read the answer and worked solution →A spinning cricket ball swerves from its parabolic path because of what?Read the answer and worked solution →Dynamic lift acts on a body by virtue of its what?Read the answer and worked solution →What are the dimensions of the coefficient of viscosity?Read the answer and worked solution →Which liquid is more viscous than water?Read the answer and worked solution →When the temperature of a liquid rises, its viscosity does what?Read the answer and worked solution →When a gas is heated, its coefficient of viscosity does what?Read the answer and worked solution →For fluid flowing in a pipe, where is the layer speed zero?Read the answer and worked solution →Viscous drag on a small sphere of radius a at speed v in a fluid of viscosity eta is given by which expression?Read the answer and worked solution →A falling raindrop reaches terminal velocity when what happens?Read the answer and worked solution →If a falling sphere's radius doubles in the same fluid, its terminal velocity becomes how many times?Read the answer and worked solution →Surface tension arises because surface molecules have what?Read the answer and worked solution →Surface energy exists at an interface where at least one substance must be what?Read the answer and worked solution →Compared with the outside, the pressure inside a spherical liquid drop is what?Read the answer and worked solution →A soap bubble of radius 1 cm and surface tension 0.03 N/m has what excess pressure?Read the answer and worked solution →Why does a soap bubble have a larger excess pressure than a drop of equal size?Read the answer and worked solution →The angle of contact is measured between which two lines?Read the answer and worked solution →What is the angle of contact of mercury with glass like?Read the answer and worked solution →When the angle of contact is acute, the liquid does what to the solid?Read the answer and worked solution →Detergents added to water have what effect on the angle of contact?Read the answer and worked solution →

Worked practice questions

What fills the space above the mercury column in a barometer tube?

  1. Dry air only
  2. Hydrogen gas
  3. Mercury vapour
  4. Water vapour
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Correct answer: C. Mercury vapour

The closed top of the tube holds only mercury vapour, whose pressure is so small that it is neglected.

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A hydraulic lift piston has 50 times the area of the small one. What force does 100 N give?

  1. 2 N
  2. 500 N
  3. 50 N
  4. 5000 N
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Correct answer: D. 5000 N

Pressure is the same on both pistons, so F2 = F1 x (A2/A1) = 100 x 50 = 5000 N.

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Hydraulic brakes in cars depend on which principle?

  1. Pascal's law
  2. Archimedes' law
  3. Hooke's law
  4. Ohm's law
Show answer and solution

Correct answer: A. Pascal's law

Pedal force raises pressure in the brake fluid, which is passed on equally to the brake cylinders.

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