Lakshya Education MCQs

Question: 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
Options:
A. 400 kg/cm²
B. 4000 kg/cm²
C. 40 × 10⁵ kg/cm²
D. 40 × 10⁶ kg/cm²
Answer: Option B

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Question 1. The discharge through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.
  1.     0.34 times
  2.     0.67 times
  3.     0.81 times
  4.     0.95 times
Answer: Option D
Question 2. The total energy of each particle at various places in the case of perfect incompressible fluid flowing in continuous stream
  1.     Keeps on increasing
  2.     Keeps on decreasing
  3.     Remain constant
  4.     May increase/decrease
Answer: Option C
Question 3. When the coefficient of discharge (cd) is 0.623, then the general equation for discharge over a rectangular weir is
  1.     1.84(L - 0.1nH)H3/2
  2.     1.84(L - nH)H2
  3.     1.84(L - 0.1nH)H5/2
  4.     1.84(L - nH)H3
Answer: Option A
Question 4. Select the correct statement
  1.     Weber's number is the ratio of inertia force to elastic force
  2.     Weber's number is the ratio of gravity force to surface tension force
  3.     Weber's number is the ratio of viscous force to pressure force
  4.     Weber's number is the ratio of inertia force to surface tension force
Answer: Option D
Question 5. The discharge over a rectangular weir, considering the velocity of approach, is (whereh1 = h + ha = total height of water above the weir, h = height of water over the crest of the weir, and ha = height of water due to velocity of approach)
  1.     (2/3) Cd × L.√2g [H1 - Ha]
  2.     (2/3) Cd × L. √2g [H13/2 - Ha3/2]
  3.     (2/3) Cd × L.√2g [H12 - Ha2]
  4.     (2/3) Cd × L. √2g [H15/2 - Ha5/2]
Answer: Option B
Question 6. The total energy of each particle at various places in the case of perfect incompressible fluid flowing in continuous stream
  1.     Keeps on increasing
  2.     Keeps on decreasing
  3.     Remain constant
  4.     May increase/decrease
Answer: Option C

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