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Physics mcqs for competitive exams preparations

PHYSICS MCQS FOR EXAMS PREPARATIONS 
physics mcqs on fluid mechanics

ANS KEY IS AT THE END

 

III. FLUID MECHANICS

21. The viscosity of an ideal fluid is

(a) infinity         (b) unity
(c) zero               (d) 0.5
 

 
22. Out of the following, the maximum viscosity is of

(a) oxygen          (b) mercury
(c) water             (d) glycerine
 

 
23. The internal friction in a fluid is called

(a) viscosity                 (b) surface tension
(c) turbulence             (d) none of these

 
24. The absolute viscosity of a fluid is primarily function of

(a) density            (b) temperature
(c) pressure          (d) velocity

 
25. Fluid mechanics is the study of how fluids move and the _____ on them.

(a) energy           (b) velocity
(c) forces             (d) position

 
26. Birds, planes and boats are streamlined to reduce

(a) turbulence             (b) thrust
(c) lift                            (d) drag

 
27. Any substance that can flow is a

(a) solid              (b) gas
(c) liquid             (d) fluid
 

 
28. The design of an airfoil uses

(a) Archimedes’ principle   (b) Bernoulli’s principle
(c) both of the above          (d) none of the above

 
29. The force that moves a rocket or a plane forward is called

(a) lift               (b) drag
(c) turbulence           (d) thrust

 
30. Which principle is in effect when a ship displaces ocean water?

(a) Bernoulli’s                       (b) Ohm’s
(c) Pascal’s                            (d) Archimedes

31. Which force pushes up a body in a fluid?

(a) thrust                 (b) lift
(c) buoyant             (d) pressure

32. When air moves an airfoil, _____ is   generated

(a) thrust          (b) lift
(c) drag             (d) turbulence
 

 
33. The study of the deformation and flow of matter, primary in the liquid state is  called

(a) Rheology        (b) Geology
(c) Physiology      (d) Cosmology
 

 
34. In flow through a straight, smooth,  pipe, the critical Reynolds number for  transition to turbulence is generally taken to be

(a) 1500        (b) 2300
(c) 4000        (d) 10,000
 

35. Minor losses through valves, fittings,   bends, etc., are modelled as proportional to

(a) velocity head     (b) static head
(c) total head           (d) pressure drop
 
 

 
36. With increase in temperature, the angle of contact of liquid

(a) increases                 (b) decreases
(c) becomes zero         (d) first increases then decreases
 
 

 
37. A gas behaves as an ideal gas at

(a) low pressure and high temperature
(b) high pressure and low temperature
(c) low pressure and low temperature
(d) high pressure and high temperature

 
38. The colour of a star is an indication of its

(a) size                    (b) weight
(c) temperature    (d) distance from the earth

 
39. What is measured by a Bolometer?

(a) specific heat       (b) thermal conductivity
(c) heat radiation    (d) e.m.f.
 

 
40. Newton’s law of cooling is a special case of

(a) Stefan’s law          (b) Wien’s law
(c) Kirchoff’s law       (d) Planck’s law

41. What is the absorption power of perfect black body?

 
a)      1                        b)   -1
b)      0                        c)   infinity

 
42. The spectrum of a black body is

(a) line                         (b) band
(c) continuous            (d) none of the above
 
 
 

ANSWERS

21. c 22. d 23. a 24. b
25. c 26. d 27. d 28. b
29. d 30. d 31. c 32. b
33. a 34. b 35. a 36. a
37. a 38. c 39. c 40. a
41. a 42. C

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