fluid mechanics objective questions with answers part11

Q1. Capillary action is due to the
(A) surface tension
(B) cohesion of the liquid
(C) adhesion of the liquid molecules and the molecules on the surface of a solid
(D) All of these

Q2. The atmospheric pressure with rise in altitude decreases
(A) linearly
(B) first slowly and then steeply
(C) first steeply and then gradually
(D) unpredictable

Q3. Pressure of the order of 10″’ torr can be measured by
(A) Bourdon tube
(B) Pirani Gauge
(C) micro-manometer
(D) ionisation gauge

Q4. Operation of McLeod gauge used for low pressure measurement is based on the principle of
(A) gas law
(B) Boyle’s law
(C) Charle’s law
(D) Pascal’s law

Q5. An odd shaped body weighing 7.5 kg and occupying 0.01 m3 volume will be completely submerged in a fluid having specific gravity of
(A) 1.5
(B) 1.2
(C) 1.8
(D) 0.75

Q6. In an isothermal atmosphere, the pressure
(A) decreases linearly with elevation
(B) remains constant
(C) varies in the same way as the density
(D) increases exponentially with elevation

Q7. Mercury is often used in barometer because
(A) the height of barometer will be less
(B) its vapour pressure is so low that it may be neglected
(C) both of these
(D) None of these

Q8. Barometer is used to measure
(A) pressure in pipes, channels et
(B) atmospheric pressure
(C) very low pressure
(D) difference of pressure between two points

Q9. Which of the following instrument can be used for measuring speed of a submarine moving in deep sea
(A) Venturimeter
(B) Orifice plate
(C) hot wire anemometer
(D) pitot tub

Q10. Which of the following instrument can be used for measuring speed of an aeroplane
(A) Orifice plate
(B) hot wire anemometer
(C) rotameter
(D) pitot tube

Q11. Piezometer is used to measure
(A) pressure in pipe, channels et
(B) atmospheric pressure
(C) very low pressures
(D) difference of pressure between two points

Q12. Which of the following instruments is used to measure flow on the application of Bernoulli’s theorem
(A) Venturimeter
(B) Orifice plate
(C) nozzle
(D) All of these

Q13. The speed of sound in a ideal gas varies directly as its
(A) pressure
(B) density
(C) modulus of elasticity
(D) absolute temperature

Q14. Dynamic viscosity of most of the liquids with rise in temperature
(A) increases
(B) decreases
(C) remains unaffected
(D) unpredictable

Q15. Dynamic viscosity of most of the gases with rise in temperature
(A) increases
(B) decreases
(C) remains unaffected
(D) unpredictable

Q16. A metal with specific gravity of o floating in a fluid of same specific gravity a will
(A) sink to bottom
(B) float over fluid
(C) partly immersed
(D) be fully immersed with top surface at fluid surface

Q17. Euler’s dimensionless number relates the following
(A) inertial force and gravity
(B) viscous force and inertial force
(C) viscous force and buoyancy force
(D) pressure force and inertial force

Q18. Which of the following manometer has highest sensitivity
(A) U-tube with water
(B) inclined U-tube
(C) U-tube with mercury
(D) micro-manometer with water

Q19. Working principle of dead weight pressure gauge tester is based on
(A) Pascal’s law
(B) Dalton’s law of partial pressure
(C) Newton’s law of viscosity .
(D) Avogadro’s hypothesis

Q20. The resultant of all normal pressures acts
(A) at g. of body
(B) at center of pressure
(C) vertically upwards
(D) at metacentre