Lakshya Education MCQs

Question: When the mach number is between __________ the flow is called super-sonic flow.
A. 1 and 2.5
B. 2.5 and 4
C. 4 and 6
D. 1 and 6
Answer: Option D

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Question 1. An open tank containing liquid is moving with an acceleration on an inclined plane. the inclination of the free surface of the liquid will be __________ to the acceleration of the tank.
  1.     Equal to
  2.     Directly proportional
  3.     Inversely proportional
  4.     None of these
Answer: Option B
Question 2. Property of a fluid by which its own molecules are attracted is called
  1.     Adhesion
  2.     Cohesion
  3.     Viscosity
  4.     Compressibility
Answer: Option B
Question 3. The property of a fluid which enables it to resist tensile stress is known as
  1.     Compressibility
  2.     Surface tension
  3.     Cohesion
  4.     Adhesion
Answer: Option C
Question 4. The rise or depression of liquid in a tube due to surface tension will increase in size of tube will
  1.     Increase
  2.     Remain unaffected
  3.     May increase or decrease depending on the characteristics of liquid
  4.     Decrease
Answer: Option D
Question 5. The force present in a moving liquid is
  1.     Inertia force
  2.     Viscous force
  3.     Gravity force
  4.     All of these
Answer: Option D
Question 6. Which of the following turbine is preferred for 0 to 25 m head of water?
  1.     Pelton wheel
  2.     Kaplan turbine
  3.     Francis turbine
  4.     None of these
Answer: Option B

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