Dynamic viscosity of most of the gases with rise in temperature___________________?
(A) increases
(B) decreases
(C) remains unaffected
(D) unpredictable
(D) none of the above
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) pitot tube
(D) all of the above
The speed of sound in a ideal gas varies directly as its ______________?
(A) pressure
(B) temperature
(C) density
(D) modulus of elasticity
(D) absolute temperature
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
(D) none of the above
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) rotameter
(D) pitot tube
Mercury is often used in barometer because _________________?
(A) it is the best liquid
(B) the height of barometer will be less
(C) its vapour pressure is so low that it may be neglected
(D) both
Which of the following instrument can be used for measuring speed of an aeroplane ________________?
(A) Venturimeter
(B) Orifice plate
(C) hot wire anemometer
(D) rotameter
(D) pitot tube
Barometer is used to measure__________________?
(A) pressure in pipes, channels etc.
(B) atmospheric pressure
(C) very low pressure
(D) difference of pressure between two points
(D) rain level
Center of buoyancy is the___________________?
(A) centroid of the displaced volume of fluid
(B) center of pressure of displaced volume
(C) e.g. of floating ‘body
(D) does not exist
(D) none of the above
A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is__________________?
(A) 1
(B) 5
(C) 7
(D) 6