Hydraulic and Fluid Mechanics

61. 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/Cdxa ×√(2g)
  2. 2A × √H2/Cdxa ×√(2g)
  3. 2A × √H1-√H2)/Cdxax√(2g)
  4. 2A × √H3/2-√H3/2)/Cdxax√(2g)

Correct answer: (C)
2A × √H1-√H2)/Cdxax√(2g)

62. 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 empty the tank completely will be

  1. (2A√H1)/(Cdxa√2g)
  2. (2AH1)/(Cdxa√2g)
  3. (2A√H13/2)/(Cdxa√2g)
  4. (2A√H12)/(Cdxa√2g)

Correct answer: (A)
(2A√H1)/(Cdxa√2g)

63. A thick liquid like syrup has a

  1. Lesser
  2. Greater
  3. Same
  4. None of these

Correct answer: (B)
Greater

64. A uniform body 3 m long, 2 m wide and 1 m deep floats in water. If the depth of immersion is 0.6 m, then the weight of the body is

  1. 3.53 kN
  2. 33.3 kN
  3. 35.3 kN
  4. None of these

Correct answer: (C)
35.3 kN

65. A venturi-flume is used to measure

  1. Pressure of liquid
  2. Discharge of liquid
  3. Pressure difference between two points in a channel
  4. Pressure difference between two points in a pipe

Correct answer: (B)
Discharge of liquid

66. A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall acts at a distance

  1. H/3
  2. H/2
  3. 2H/3
  4. 3H/4

Correct answer: (C)
2H/3

67. A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall per unit length is (where w = Specific weight of liquid, and H = Height of liquid)

  1. wH
  2. wH/2
  3. wH2/2
  4. wH2/3

Correct answer: (C)
wH2/2

68. A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. Which of the following statement is correct?

  1. The pressure on the wall at the liquid level is minimum
  2. The pressure on the bottom of the wall is maximum
  3. The pressure on the wall at the liquid level is zero, and on the bottom of the wall is maximum
  4. The pressure on the bottom of the wall is zero

Correct answer: (C)
The pressure on the wall at the liquid level is zero, and on the bottom of the wall is maximum

69. A vessel of 4 m3 contains oil which weighs 30 kN. The specific weight of the oil is

  1. 4.5 kN/m3
  2. 6 kN/m3
  3. 7.5 kN/m3
  4. 10 kN/m3

Correct answer: (C)
7.5 kN/m3

70. A water tank contains 1.3 m deep water. The pressure exerted by the water per metre length of the tank is

  1. 2.89 kN
  2. 8.29 kN
  3. 9.28 kN
  4. 28.9 kN

Correct answer: (B)
8.29 kN

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