Hydraulics and Fluid Mechanics Mock test – 5 || Civil Engineering Mock tests Welcome to your Hydraulics & Fluid Mechanics Mock test - 5 Take an exciting test in Hydraulics/Fluid Mechanics You have only 20 mins to complete the test (25 Questions) Wish you all the best!!! Name Email 1) The most efficient section of a channel is (A) Triangular (B) Rectangular (C) Square (D) Trapezoidal2) The specific weight of water in S.I. units is taken as (A) 9.81 kN/m3 (B) 9.81 × 103 N/m3 (C) 9.81 × 10-6 N/mm3 (D) Any one of these3) When the Mach number is less than unity, the flow is called (A) Sub-sonic flow (B) Sonic flow (C) Super-sonic flow (D) Hyper-sonic flow4) The body will float if the force of buoyancy is __________ the weight of the liquid displaced. (A) Equal to (B) Less than (C) More than (D) None of these5) A fluid having no viscosity is known as (A) Real fluid (B) Ideal fluid (C) Newtonian fluid (D) Non-Newtonian fluid6) A flow whose streamline is represented by a straight line, is called __________ dimensional flow. (A) One (B) Two (C) Three (D) Four7) In order to avoid tendency of separation at throat in a Venturimeter, the ratio of the diameter at throat to the diameter of pipe should be (A) 1/16 to 1/8 (B) 1/8 to 1/4 (C) 1/4 to 1/3 (D) 1/3 to 1/28) If the coefficient of discharge is 0.6, then the discharge over a right angled notch is (A) 0.417 H5/2 (B) 1.417 H5/2 (C) 4.171 H5/2 (D) 7.141 H5/29) Bulk modulus of a fluid __________ as the pressure increases. (A) Remain same (B) Decreases (C) Increases (D) None of these10) 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. (A) Equal to (B) Directly proportional (C) Inversely proportional (D) None of these11) Center of pressure on an inclined plane is (A) At the Centroid (B) Above the Centroid (C) Below the Centroid (D) At metacentre12) A structure, whose width is __________ the width of the channel, is called a flumed structure. (A) Less than (B) More than (C) Equal (D) None of these13) The specific gravity of an oil whose specific weight is 7.85 kN/m3, is (A) 0.8 (B) 1 (C) 1.2 (D) 1.614) The process of diffusion of one liquid into the other through a semi permeable membrane is called (A) Viscosity (B) Osmosis (C) Surface tension (D) Cohesion15) Liquids transmit pressure equally in all the directions. This is according to (A) Boyle's law (B) Archimedes principle (C) Pascal's law (D) Newton's formula16) The discharge over a triangular notch is A) Inversely proportional to H3/2 B) Directly proportional to H3/2 C) Inversely proportional to H5/2 D) Directly proportional to H5/217) Falling drops of water become spheres due to the property of (A) Surface tension of water (B) Compressibility of water (C) Capillarity of water (D) Viscosity of water18) The velocity corresponding to Reynold number of 2000 is called (A) Sub-sonic velocity (B) Super-sonic velocity (C) Lower critical velocity (D) Higher critical velocity19) The density of water is 1000 kg/m3 at (A) 0° C (B) 0° K (C) 4° C (D) 20° C20) One stoke is equal to (A) 10-2 m2/s (B) 10-3 m2/s (C) 10-4 m2/s (D) 10-6 m2/s21) The coefficient of discharge for an external mouthpiece is (A) 0.375 (B) 0.5 (C) 0.707 (D) 0.85522) Which of the following meters is not associated with viscosity? (A) Red wood (B) Say bolt (C) Engler (D) Orsat23) When the pressure intensity at a point is more than the local atmospheric pressure, then the difference of these two pressures is called (A) Gauge pressure (B) Absolute pressure (C) Positive gauge pressure (D) Vacuum pressure24) The force of buoyancy is always __________ the weight of the liquid displaced by the body. (A) Equal to (B) Less than (C) More than (D) None of these25) A pipe of length more than double the diameter of orifice fitted externally or internally to the orifice is called a (A) Notch (B) Weir (C) Mouthpiece (D) Nozzle