Fluid Mechanics MCQs with answers Page - 1

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Q. A balloon lifting in air follows the following principle

  • (A) law of gravitation
  • (B) archimedes principle
  • (C) principle of buoyancy
  • (D) all of the above

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Q. A body floats in stable equilibrium

  • (A) when its meatcentric height is zero
  • (B) when the metancentre is above e.g
  • (C) when its e.g. is below it’s center of buoyancy
  • (D) metacentre has nothing to do with position of e.g. for determining stability

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Q. A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will

  • (A) increase
  • (B) decrease
  • (C) remain same
  • (D) increase/decrease depending on depth of immersion

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Q. A fluid in equilibrium can’t sustain

  • (A) tensile stress
  • (B) compressive stress
  • (C) shear stress
  • (D) bending stress

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Q. A fluid is said to be ideal, if it is

  • (A) incompressible
  • (B) inviscous
  • (C) viscous and incompressible
  • (D) inviscous and incompressible

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Q. A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal to

  • (A) 10 kg
  • (B) 100 kg
  • (C) 1000 kg
  • (D) 1 kg

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Q. A large Roynold number is indication of

  • (A) smooth and streamline flow
  • (B) laminar flow
  • (C) steady flow
  • (D) highly turbulent flow

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Q. A liquid compressed in cylinder has a volume of 0.04 m³ at 50 kg/cm² and a volume of 0.039 m³ at 150 kg/cm². The bulk modulus of elasticity of liquid is

  • (A) 400 kg/cm²
  • (B) 4000 kg/cm²
  • (C) 40 x 10^5 kg/cm²
  • (D) 40 x 10^6 kg/cm²

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Q. A liquid would wet the solid, if adhesion forces as compared to cohesion forces are

  • (A) less
  • (B) more
  • (C) equal
  • (D) less at low temperature and more at high temperature

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Q. A metal with specific gravity of o floating in a fluid of same specific gravity a will

  • (A) sink to bottom
  • (B) float over fluid
  • (C) partly immersed
  • (D) be fully immersed with top surface at fluid surface

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