MODERN PHYSICS AND FLUID MECHANICS
1. How many ng are there in 5.27 x 10-13 kg?
a. 0.345 ng
b. 0.235 ng
c. 5.27 ng
d. 0.527 ng
2. If the density of an object is 2.87 x 10-4 lbs/in3, what is its density in g/mL?
a. 2.5 x10-4
b. 7.95 x 10-4 c. 2.5 x 10-3 d. 7.95 x 10-3
3. Is the measure of resistance of a fluid to gradual deformation by shear or tensile stress or simply the fluid’s resistance to
flow?
a. Density
b. Specific Gravity c. Specific Weight
d. Viscosity
4. Is the weight per unit volume of a substance and is also known as Unit Weight?
a. Specific Volume b. Specific Gravity
c. Density
d. Specific Weight
5. Is the ratio of the fluid’s density to the universal density?
a. Specific Volume b. Specific Gravity
c. Density
d. Specific Weight
6. The SI unit of viscosity is Pa-s (pascal-seconds), determine the dimension of viscosity using FLT system.
a. N-s/m2
b. N-s2/m
c. FT2/L
d. FT/L2
7. Is the temperature inside the furnace is 700 K, what is the corresponding reading in ºF?
a. 427 ºF
b. 700.6 ºF
c. 806.6 ºF
d. 800.6 ºF
8. A mountain climber has reached the peak of a mountain and found out the pressure to be at 75.86 Kpa. How tall is the
mountain?
a. 5.2 km
b. 4.2 km
c. 3.2 km
d. 2.2 km
9. A coverless cylindrical tank is filled with water to a height of 1.5m. After some time, oil is poured and completely fills the
tank. If the tank is about 2m high and the specific gravity of oil is 0.780, determine the pressure between the oil and
water.
a. 100 kpa b. 102 kpa
c. 103 kpa
d. 105 kpa
10. A coverless cylindrical tank is filled with water to a height of 1.5m. After some time, oil is poured and completely fills the
tank. If the tank is about 2m high and the specific gravity of oil is 0.780, determine the pressure at the bottom of the
tank.
a. 100 kpa b. 102 kpa
c. 103 kpa
d. 105 kpa
11. If your mass on earth is found to be 50 kg, what will be your new mass if you will be transported to the moon this very
instant?
a. 9.81 times that of earth’s
c. you are mass less
b. 9.81 more that of earth’s
d. Remains the same
12. If your mass on earth is found to be 50 kg and you are transported to the moon this very instant. How much will you
weigh on the moon if the acceleration due to gravity on the moon’s surface is 2/3 of that on earth?
a. 227 N
b. 327 N
c. 427 N
d. 527 N
13. A box at rest has a force of 20 KN acting on the right side and 35 KN on the left side. Which direction will the box move
if both forces are applied at the same time and how much is the resultant force?
a. 15 KN going up b. 15 KN going down
c. 15 KN going left
d. 15 KN going right
14. A force of 200 N is acting on a single point 20 degrees from the ground. What is the direction of the force?
a. 20º NW
b. 20º SW
c. 20º SE
d. 20º NE
15. A car is moving at a speed of 25 mph and arrives to its destination after 5 hrs. how far did the car travel in km?
a. 125 km
b. 225 km
c. 301 km
d. 202 km
16. A steel ball was dropped from a 4-storey building, what is the acceleration of the steel ball in English units?
a. 9.81 m/s2
b. 32.2 m/s2
c. 9.81 ft/s2
d. 32.2 ft/s2
17. A television was thrown downward from a 50 ft tower with an initial speed of 18 ft/s. Determine the speed at which it hits
the ground?
a. 30 ft/s
b. 40 ft/s
c. 50 ft/s
d. 60 ft/s
18. A television was thrown downward from a 50 ft tower with an initial speed of 18 ft/s. how long will it hit the ground?
a. 5.21 sec
b. 4.29 sec
c. 3.29 sec
d. 1.29 sec
19. A train travels with an initial speed of 70 km/h, and accelerates at 6000 km/hr2 along a straight road. How long will it
take to reach a speed of 120 km/h?
a. 30 hr b. 25 sec
c. 30 sec
d. 25 hr
20. A train travels with an initial speed of 70 km/h, and accelerates at 6000 km/hr2 along a straight road. How far will it take
to reach a speed of 120 km/h?
b. 592 m b. 692 m
c. 792 m
d. 892 m
21. A stone is dropped down a well, and a second later a rock was also dropped. Determine the distance between the stone
and the rock another second later?
a. 26.1 ft
b. 18.9 ft
c. 35.2 ft
d. 48.3 ft
22. A bus from rest and accelerates at 1m/s2. Determine the time required for it to attain a speed of 25 m/s
a. 25 sec
b. 30 sec
c. 40 sec
d. 50 sec
23. From problem 22, how far did the bus travel?
a. 312 m
b. 412 m
c. 512 m
d. 612 m
24. A man walks 4 km in hours and 1 km in 1 hour in the same direction. What is the man’s average speed for the whole
journey?
a. 4/2 km/hr
b. 5/2 km/hr
c. 4/3 km/hr
d. 5/3 km/hr
25. A man walks 4 km in hours and 1 km in 1 hour in the same direction. What is the man’s average velocity for the whole
journey?
b. 4/2 km/hr
b. 5/2 km/hr
c. 4/3 km/hr
d. 5/3 km/hr
26. A car travels 22 km south, 12 km west, and 41 km north in an hour and a half. What is the total distance traveled by the
car?
a. 19.5 km
b. 22.2 km
c. 65 km
d. 75 km
27. A car travels 22 km south, 12 km west, and 41 km north in an hour and a half. What is the final displacement of the car?
a. 15 km
b. 22 km
c. 65 km
d. 75 km
28. A car travels 22 km south, 12 km west, and 41 km north in an hour and a half. What is the average speed of the car?
a. 15 km/hr
b. 22 km/hr
c. 50 km/hr
d. 75 km/hr
29. A car travels 22 km south, 12 km west, and 41 km north in an hour and a half. What is the average velocity of the car?
a. 15 km/hr
b. 22 km/hr
c. 50 km/hr
d. 75 km/hr
30. A plane flew 600 miles in three hours with a tailwind of 75 mph. what is the velocity of the plane in the still air?
a. 75 mph
b. 125 mph
c. 225 mph
d. 275 mph
31. A plane flew 600 miles in three hours with a headwind of 75 mph. what is the velocity of the plane in the still air?
b. 75 mph
b. 125 mph
c. 225 mph
d. 275 mph
32. What is the x-component of a vector with a magnitude of 250 lbs and a direction of 68 degrees with respect to the
negative x-axis?
a. 93.65 N
b. 93.65 lbs
c. 231.8 N
d. 231.8 lbs
33. What is the y-component of a vector with a magnitude of 250 lbs and a direction of 68 degrees with respect to the
negative x-axis?
a. 93.65 N
b. 93.65 lbs
c. 231.8 N
d. 231.8 lbs
34. From a figure A, express 20 KN in its rectangular form.
a. 10i – 17.31j
b. 5.66i + 5.66j
c. 10i + 17.32j
d. I – 4j
35. From figure A, express 8 KN in its rectangular form.
a. 10i – 17.31j
b. 5.66i + 5.66j
c. 10i + 17.32j
d. 5.66i – 5.66j
36. From figure A, express 8 KN in its rectangular form.
a. i – 4j
b. 5.66i + 5.66j
c. - 4j
d. 5.66i – 5.66j
37. From figure A, determine the resultant of the three forces.
a. 17.43 KN
b. 25.56 KN
c. 31.17 KN
d. 43.17 KN
38. From a figure A, express the resultant in its rectangular form.
a. 16i – 8j
b. 8i + 16j
c. 17i + 4j
d. 16i + 8j
39. From figure A, determine the direction of the resultant.
a. 63.9º
b. 25º
c. 36º
d. 15.66º
40. The mass moment of inertia I of a homogeneous sphere about its diameter is I = 2/5mR2 , where m and R are its mass
and radius, respectively. Find the dimension of I using the MLT system.
a. MLT0
b. M0L2T0
c. ML2T0
d. ML2T-1
41. The mass moment of inertia I of a homogeneous sphere about its diameter is I = 2/5mR2 , where m and R are its mass
and radius, respectively. Find the dimension of I using the FLT system.
a. FLT0
b. FL2T2
c. F1L1T2
d. FL2T-1
42. A boiler installed has a pressure of 12 kg/cm2 and a barometer reading of 755 mmHg. What is the absolute pressure in
MPa? (Note: Barometer always reads the surrounding pressure)
a. 1.3 Mpa
b. 2.5 Mpa
c. 1277 Mpa
d. 1177Mpa
43. Is also called the negative pressure
a. Absolute Pressure
b. Gauge Pressure
c. Atmospheric Pressure
d. Vacuum Pressure
44. A cylindrical tank 4 ft wide and 7ft long is full of oil. If the specific gravity of oil is 0.9, what is its density in slugs/ft3?
a. 56.16 slugs/ft3
b. 1.744 slugs/ft3
c. 28.29 slugs/ft3
d. 87.96 slugs/ft3
45. A cylindrical tank 4 ft wide and 7ft long is full of oil. If the specific gravity of oil is 0.9, what is its specific weight in lb/ft3?
a. 56.16 slugs/ft3
b. 1.744 slugs/ft3
c. 28.29 slugs/ft3
d. 87.96 slugs/ft3
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