Questions and answers for exam Preparation

MCQs

Total Questions : 3147 | Page 141 of 315 pages

Question 1401. The increase in pressure at the outer edge of a drum of radius (r) completely filled up with liquid of density (ρ) and rotating at (ω) rad/s is

ρ ω² r2
2ρ ω² r2
ρ ω² r2/2
ρ ω² r2/4

Discuss Question

Answer: Option C. -> ρ ω² r2/2
Answer: (c).ρ ω² r2/2

Question 1402. An internal mouthpiece is said to be running free if the length of the mouthpiece is __________ the diameter of the orifice.

less than twice
more than twice
less than three times
more than three times

Discuss Question

Answer: Option C. -> less than three times
Answer: (c).less than three times

Question 1403. When the Mach number is between __________ the flow is called super-sonic flow.

1 and 2.5
2.5 and 4
4 and 6
1 and 6

Discuss Question

Answer: Option D. -> 1 and 6
Answer: (d).1 and 6

Question 1404. The discharge over a rectangular notch is

inversely proportional to H^3/2
directly proportional to H^3/2
inversely proportional to H^5/2
directly proportional to H^5/2

Discuss Question

Answer: Option B. -> directly proportional to H^3/2
Answer: (b).directly proportional to H^3/2

Question 1405. A glass tube of small diameter (d) is dipped in fluid. The height of rise or fall in the tube given by (where w = Specific weight of liquid, α = Angle of contact of the liquid surface, and σ = Surface tension)

4wd/σ cosα
σ cosα/4wd
4σ cosα/wd
wd/4σ cosα

Discuss Question

Answer: Option C. -> 4σ cosα/wd
Answer: (c).4σ cosα/wd

Question 1406. Barometer is used to measure

velocity of liquid
atmospheric pressure
pressure in pipes and channels
difference of pressure between two points in a pipe

Discuss Question

Answer: Option B. -> atmospheric pressure
Answer: (b).atmospheric pressure

Question 1407. A closed tank is completely filled with an oil. If it is made to move with a horizontal acceleration, then the pressure at the back end will be more than that at the front end.

Correct
Incorrect
Can't say
None of these

Discuss Question

Answer: Option A. -> Correct
Answer: (a).Correct

Question 1408. The specific weight of compressible fluids does not remain constant.

True
False
Can't say
None of these

Discuss Question

Answer: Option A. -> True
Answer: (a).True

Question 1409. The property of a liquid which offers resistance to the movement of one layer of liquid over another adjacent layer of liquid, is called