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Q1. Which of the following is dimensionless?
(A) Specific weight
(B) Specific volume
(C) Specific speed
(D) Specific gravity
Answer: (D) Specific gravity
Q2. Poise is the unit of
(A) Surface tension
(B) Capillarity
(C) Viscosity
(D) Shear stress in fluids
Answer: (C) Viscosity
Q3. The discharge over the trapezoidal notch is equal to the discharge over the rectangular notch __ the discharge over the triangular notch.
(A) Plus
(B) Minus
(C) Divide
(D) None of these
Answer: (A) Plus
Q4. The water pressure per metre length on a vertical masonry wall of dam is (where w = Specific weight of the liquid, and H = Height of the liquid)
(A) wH/2
(B) wH
(C) wH2/2
(D) wH2/4
Answer: (C) wH2/2
Q5. The flow in which conditions do not change with time at any point, is known as
(A) One dimensional flow
(B) Uniform flow
(C) Steady flow
(D) Turbulent flow
Answer: (C) Steady flow
Q6. If 850 kg liquid occupies volume of one cubic meter, men 0.85 represents its
(A) Specific weight
(B) Specific mass
(C) Specific gravity
(D) Specific density
Answer: (C) Specific gravity
Q7. A vessel of 4 m3 contains oil which weighs 30 kN. The specific weight of the oil is
(A) 4.5 kN/m3
(B) 6 kN/m3
(C) 7.5 kN/m3
(D) 10 kN/m3
Answer: (C) 7.5 kN/m3
Q8. A fluid having no viscosity is known as
(A) Real fluid
(B) Ideal fluid
(C) Newtonian fluid
(D) Non-Newtonian fluid
Answer: (B) Ideal fluid
Q9. 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 H5/2
Answer: (B) 1.417 H5/2
Q10. The units of dynamic or absolute viscosity are
(A) Metres² per sec
(B) kg sec/meter
(C) Newton-sec per meter
(D) Newton-sec² per meter
Answer:(C) Newton-sec per meter
Q11. The critical depth for a channel is given by (where q = Unit discharge (discharge per unit width) through the channel)
(A) (q/g)1/2
(B) (q²/g)1/3
(C) (q³/g)1/4
(D) (q⁴/g)1/5
Answer:(B) (q²/g)1/3
Q12. Density of water is maximum at
(A) 0° C
(B) 0° K
(C) 4° C
(D) 100° C
Answer: (C) 4° C
Q13. The liquid used in manometers should have
(A) Low density
(B) High density
(C) Low surface tension
(D) High surface tension
Answer: (D) High surface tension
Q14. Falling drops of water become spheres due to the property of
(A) Adhesion
(B) Cohesion
(C) Surface tension
(D) Viscosity
Answer: (C) Surface tension
Q15. According to Bazin’s formula, the discharge over a rectangular weir is mL2g x H3/2where m is equal to
(A) 0.405 + (0.003/H)
(B) 0.003 + (0.405/H)
(C) 0.405 + (H/0.003)
(D) 0.003 + (H/0.405)
Answer: (A) 0.405 + (0.003/H)
Q16. When an internal mouthpiece is running free, the discharge through the mouthpiece is (where a = Area of mouthpiece, and H = Height of liquid above the mouthpiece)
(A) 0.5 a. √2gH
(B) 0.707 a. √2gH
(C) 0.855 a. √2gH
(D) a. √2gH
Answer: (A) 0.5 a. √2gH
Q17. The pressure of liquid at throat in a Venturimeter is __ than that at inlet.
(A) Higher
(B) Lower
(C) Same
(D) None of these
Answer: (B) Lower
Q18. Coefficient of resistance is the ratio of
(A) Actual velocity of jet at vena-contracta to the theoretical velocity
(B) Area of jet at vena-contracta to the area of orifice
(C) Loss of head in the orifice to the head of water available at the exit of the orifice
(D) Actual discharge through an orifice to the theoretical discharge
Answer: (C) Loss of head in the orifice to the head of water available at the exit of the orifice
Q19. Viscous force is the __ of shear stress due to viscosity and cross-section area of flow.
(A) Sum
(B) Different
(C) Product
(D) Ratio
Answer: (C) Product
Q20. Ratio of inertia force to surface Jension is known as
(A) Mach number
(B) Froude number
(C) Reynolds’s number
(D) Weber’s number
Answer: (D) Weber’s number
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