Lakshya Education MCQs

Question: Surface tension has the units of
Answer: Option C

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Question 1. According to Bernoulli's equation for steady ideal fluid flow
  1.    Principle of conservation of mass holds
  2.    Velocity and pressure are inversely proportional
  3.    Total energy is constant throughout
  4.    The energy is constant along a streamline but may vary across streamlines
Answer: Option D
Question 2. A Francis turbine is used when the available head of water is
  1.    0 to 25 m
  2.    25 m to 250 m
  3.    Above 250 m
  4.    None of these
Answer: Option B
Question 3. Pressure intensifier increases the pressure in proportion to
  1.    Ratio of diameters
  2.    Square of ratio of diameters
  3.    Inverse ratio of diameters
  4.    Square of inverse ratio of diameters
Answer: Option B
Question 4. A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to bring the liquid level from H1 to H2 will be
  1.    2A × √H₁/Cd × a × √(2g)
  2.    2A × √H₂/Cd × a × √(2g)
  3.    2A × (√H₁ - √H₂)/Cd × a × √(2g)
  4.    2A × (√H3/2 - √H3/2)/Cd × a × √(2g)
Answer: Option C
Question 5. A metal with specific gravity of 'a' floating in a fluid of same specific gravity 'a' will
  1.    Sink to bottom
  2.    Float over fluid
  3.    Partly immersed
  4.    Be fully immersed with top surface at fluid surface
Answer: Option D
Question 6. Impulse turbine is generally fitted
  1.    At the level of tail race
  2.    Little above the tail race
  3.    Slightly below the tail race
  4.    About 2.5 m above the tail race to avoid cavitations
Answer: Option B

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