REFRESHER GEAS 1.pdf

GEAS 1ENGR. REYNILAN L. DIMAL

1. What is the range of a projectile if the initial velocity is 30 m/s at an angle of 30 degrees with the horizontal?

A. 100 m

B. 92 m

C.79.45 m

D.110 m

2. Newton’s Second law of motion states that the rate of change of momentum with respect to time is:

A. force

B. power

C. energy

D. work

3. The number 175.00 has how many significant figures?

A. 3

B. 4

C. 5

D. 2

4. The “kilowatt-hour” is a unit of ___________.

A. work

B. energy

C. Power

D. work or energy

5. What is another term for a scalar product of two vectors?

A. Cross product

B. Dot product

C. Vector product

D. Plus product

6. What is another term for vector product of two vectors?

A. Cross product

B. Dot product

C. Vector product

D. Plus product

7. What is the property of matter which is the reluctance to change its state of rest or of uniform motion?

A. impulse

B. inertia

C. momentum

D. equilibrium

8. What is the maximum value of the static friction?

A. starting friction

B. kinetic friction

C. sliding friction

D. dynamic friction

9. What is the energy something possesses by virtue of its motion?

A. kinetic energy

B. potential energy

C. rest energy

D. mechanical energy

10. What is the energy something possesses by virtue of its mass?

A. kinetic energy

B. potential energy

C. rest energy

D. mechanical energy

11. What is the energy something possesses by virtue of its position?

A. kinetic energy

B. potential energy

C. rest energy

D. mechanical energy

12. “The Acceleration of a particular body is directly proportional to the resultant force acting on it and inversely proportional to its mass” is a statement of

A. Joule’s Law

B. 1st Law of Thermodynamics

C. Newton’s 2nd Law of Motion

D. Boyle’s Law

13. In a trajectory, at what angle will the object be fired in order to reach a maximum range?

A. 45O

B. 30O

C. 60O

D. 75O

14. The quantity of heat required to change the temperature of unit mass through one degree.

A. Temperature

B. Specific Heat

C. Thermal Equilibrium

D. Calorie

15. From the speed of 100 kph, a car decelerates at the rate of 15 m/min/sec along a straight road. Which of the following gives the distance travelled at the end of 40 sec.

A. 3800 m

B. 911.112 m

C. 91.111 m

D. 455.56 m

16. In optics, this effect refers to the blurring of the image produced on a concave mirror due to the convergence of rays far from the mirror to other points on the principal axis. What do you call this effect?

A. spherical aberration

B. focal divergence

C. parallax error

D. Snell’s effect

17. A rock is dropped into an old well. After 4 seconds, the sound of the rock splashing into the water is heard. What is the depth of the well if the speed of sound is 330 m/s?

A. 65.43m

B. 70.34m

C. 76.33m

D. 82.54m

18. The velocity of a particle moving along the x axis is defined by v = x^4 + 2x^3 –3x^2 where v is in m/s and x is in m. Which of the following gives the velocity when x = 2m.

A. 20 m/s

B. 44 m/s

C. 40 m/s

D. 22 m/s

19. An automobile accelerates at a constant rate of 15 mi/hr to 45 mi/hr in 15 seconds, while travelling in a straight line. What is the average acceleration?

A. 2 ft/s

B. 2.12 ft/s

C. 2.39 ft/s

D. 2.93 ft/s

20. It describes the luminous flux incidence per unit area and is expressed in lumens per square meter.

A. Illuminance

B. Luminance

C. Luminous intensity

D. Radiance

21. The energy stored in a starched elastic material such as spring is

A. Mechanical energy

B. Elastic potential energy

C. Internal energy

D. Kinetic energy

22. What is the unit of mass moment of inertia?

A. kg-m^4

B. kg-m^3

C. kg-m^2

D. kg-m

23. The principles of kinetics of particles are derived from which law?

A. Newton’s first law

B. Newton’s third law

C.Newton’s second law

D.d’Alembert’s principle

24. If the coefficient of restitution is zero, the impact is __________.

A. partially elastic

B. perfectly elastic

C. perfectly inelastic

D. partially elastic

25. The load that acts on a body with some velocity causing loss of potential energy and kinetic energy is known as _________.

A. moving load

B. impact load

C. apparent load

D. impulse load

26. If two forces, 30kN and 20kN are separated by 50 degrees, what is the resultant force?

A. 43.54 kN

B. 45.51 kN

C. 44.45 kN

D. 46.63 kN

27. Given 3 vectors, 500N at 30O, 300N at 150O and 400N at 270O, what is the magnitude of the resultant vector?

A. 137.21N

B. 143.71N

C. 173.21N

D. 177.31N

28. What is the dot product of the vectors: A = 6i +4j -5k and B = 5i + 3j + 7.

A. 4

B. 5

C. 6

D. 7

29. What is the cross product of the vectors: A = 6i +4j -5k and B = 5i + 3j + 7.

A. 43i-67j-2k

B. 43i+67j-2k

C. 43i-67j+2k

D. 43i+67j+2k

30. How long does it take for a ball tossed up along the y-axis to reach its maximum height if it was given a vertical initial speed of 15m/s?

A. 1.35s

B. 1.53s

C. 3.15s

D. 5.13s

31. What is the horizontal range of a projectile if the object is fired from a building 400m high and initial velocity of 350 m/s? The angle of elevation of the projectile is 25O.

A. 10.4 km

B. 11.2 km

C. 12.6 km

D. 14.4 km

32. What is the force exerted by an 80-kg man if he is standing in an elevator that is moving at 2.75 m/s^2 downward?

A. 220.0N

B. 356.6N

C. 564.8N

D. 784.8N

33. How much work is required to raise a 0.1-kg block to a height of 2 m and simultaneously give it a velocity of 3 m/s?

A. 1.42 J

B. 1.67 J

C. 2.12 J

D. 2.41 J

34. A particle moves such that its displacement (in centimeters) at any time t (in seconds), measured from a fixed reference point along a straight line, is defined as: s = 5t^3 + 18t^2 -8t + 3. How far will the particle travel during the fifth second?

A. 459 cm

B. 574 cm

C. 1038 cm

D. 1245 cm

35. If the lifetime of pions at rest in the laboratory is 2.6 x 10-8s, at what speed must the pions travel with respect to the laboratory so that their lifetime is 7.8 x 10-8s as measured by a laboratory observer?

A. 0.89c

B. 0.94c

C. 0.98c

D. 0.49c

36. A projectile weighing 100 pounds strikes the concrete wall of a fort with an impact velocity of 1200 ft/s. the projectile comes to rest in 0.01 s, having penetrated the 8-foot thick wall to a distance of 6 feet. What is the average force exerted on the wall by the projectile?A. 3.57 x10^5 lbsB. 3.75 x10^5 lbsC. 37.5 x 10^5 lbsD. 35.7 x10^5 lbs

37. What is the weight of the water in a waterbed which is 2.4 m long, 1.8 m wide and 0.23 m deep?

A. 11.7 kN

B. 10.7 kN

C. 9.7 kN

D. 8.7 kN

38. A pendulum of length 4m is pulled aside and released. Find the period of the pendulum on earth.

A. 0.25 s

B. 0.40 s

C. 2.5 s

D. 4.0 s

39. An airplane is flying in a horizontal circle of radius 1.5 km with a speed of 450 km/hr. What is the magnitude of the centripetal acceleration of the plane?

A. 13.5 m/s2

B. 30.0 m/s2

C. 10.4 m/s2

D. 15.2 m/s2

40. A 1200 kg car oscillates vertically on its suspension springs with a period of 0.60s when empty. If six persons, each of mass 80 kg, get into the car, how far down will the supporting springs be depressed?

A. 3.6 cm

B. 3.6 m

C. 0.36 m

D. 0.36 cm

41. What is the fundamental frequency of a 0.3 m string if the string wave speed is equal to 900 m/s?

A. 1000 Hz

B. 2000 Hz

C. 500 Hz

D. 1500 Hz

42. An astronaut carries a meter stick in his spaceship. The meter stick is aligned in the direction of motion of his spaceship, which is moving at a speed of 0.8c relative to the earth. What is the length of the meter stick, as measured by an observer back on earth?

A. 0.8 m

B. 0.9 m

C. 0.6 m

D. 0.7 m

43. A small boy stands with his finger plugging a hole in a dike. The hole has a diameter of 12 mm and is located 3.4 m below the surface level of the water behind the dike. How much force must the boy exert to hold back the water?

A. 3.30 N

B. 3.08 N

C. 3.80 N

D. 0.38 N

44. A string 80cm long has a mass of 6.4 x 10^-2 g and is stretched by a force of 96N. What is the frequency of the fundamental vibration?

A. 6.8 x 10^2 vib/s

B. 6.8 x 10^3 vib/s

C. 1.1 x 10^3 vib/s

D. 1.1 x 10^2 vib/s

45. Calculate the wavelength of a 1500-kg automobile traveling with a speed of 25m/s.

A. 2.21 x 10^-38 m

B. 2.12 x 10^-38 m

C. 1.80 x 10^-38 m

D. 1.08 x 10^-38 m

46. What effect do the following forces have on a point: 100N, 30°E of N; 200 N, 80°S of E; 150N, 45°S of W; 175 N, 25°W of N; 50N, due N.

A. 95.6 N, 4.5° S of W

B. 95.6 N, 4.5° W of S

C. 59.6 N, 4.5°W of S

D. 59.6 N, 4.5°S of W

47. An airplane lands on a carrier deck at 150 mi/hr and is brought to a stop uniformly, by an arresting device, in 500 ft. Find the time required to stop.

A. 5.44 s

B. 10.88 s

C. 4.55 s

D. 9.1 s

48. A projectile fired at an angle of 45 degrees with the horizontal has an initial velocity of 10 m/s. After what time will it reach its maximum range?

A. 4.14 s

B. 1.44 s

C. 1.09 s

D. 2.18 s

49. What average force is necessary to stop a bullet of mass 20g and speed 250 m/s as it penetrates wood to a distance of 12 cm?

A. 3.8 KN

B. 5.2 KN

C. 4.1 KN

D. 7.3 KN

50. An automobile traveling 30 m/s has wheels of 0.75 m diameter. What is the angular speed of the wheels about the axle?

A. 22.5 rad/s

B. 80 rad/s

C. 40 rad/s

D. 45 rad/s

51. A ball is shot at a ground level at an angle of 60 degrees with the horizontal with an initial velocity of 100 m/s. Which of the following gives the height of the ball after 2 seconds?

A. 135.6 m

B. 315.2 m

C. 173.2 m

D. 153.6 m

52. The number of electrons in a neutral atom of every element is always equal to the atom’s ____.

A. Number of nucleons

B. Number of neutrons

C. Number of positrons

D. Number of protons

53. The atom of carbon-14 contains______.

A. 6 protons, 8 neutrons, and 8 electrons

B. 6 protons, 8 neutrons, and 6 electrons

C. 6 protons, 6 neutrons, and 8 electrons

D. 8 protons, 6 neutrons, and 6 electrons

54. Compounds are mostly classified as

A. Homogenous and heterogeneous

B. Acids and bases

C. Gaseous, liquids and solids

D. Metals and non-metals

55. What is the property of metals that allow them to be rolled without breaking?

A. Ductility

B. Malleability

C. Luster

D. Elasticity

56. What acid is added to carbonated drinks to produce a tart taste?

A. Citric acid

B. Phosphoric acid

C. Sulfuric acid

D. Nitric acid

57. “The masses of elements in a pure compound are always in the same proportion”. This statement is known as ___________.

A. Law of multiple proportion

B. Law of definite proportion

C. The periodic table

D. Dalton’s theory

58. The discovery of radioactivity further confirms the existence of subatomic particles. Who discovered radioactivity?

A. Henri Becquerel

B. Marie Curie

C. Pierre Curie

D. Niels Bohr

59. Elements in the group 1A in the periodic table are _______.

A. Boron Group

B. Alkali earth metals

C. Alkali metals

D. Carbon group

60. What is the second most abundant element in the human body?

A. Carbon

B. Hydrogen

C. Oxygen

D. Nitrogen

61. Caustic soda is used making soap, textiles and paper. What is another term for caustic soda?

A. Sodium benzoate

B. Sodium hydroxide

C. Potassium chlorate

D. Cesium bromide

62. An instrument that separates particles of different isotopic composition and measure their individual relative masses

A. mass spectrometer

B. barometer

C. hygrometer

D. hydrometer

63. These are compounds containing water molecules loosely bound to the other components

A. isotope

B. hydrates

C. ion

D. mixture

64. If a more active element replaces a less active one in a compound, the reaction is

A. combustion reaction

B. replacement reaction

C. metathesis

D. double displacement

65. If a single reactant is transformed by heat or electricity into two or more products, the type of reaction is

A. decomposition

B. combination

C. displacement

D. double displacement

66. The numerical value for standard pressure of any gas

A. 76 mmHg

B. 760 cmHg

C. 760 mmHg

D. 7.6 cmHg

67. The mass of a neutron is equal to ______________

A. 1.6749 x 10^-27 kg

B. 1.008665 amu

C. 1.6749 x 10^-24 g

D. All of the above

68. Proton was discovered by

A. John Dalton

B. James Chadwick

C. J. J. Thomson

D. Ernest Rutherford

69. Electron was discovered by

A. Rutherford

B. Thomson

C. Goldstein

D. Chadwick

70. The charge of a neutron is ______________

A. +1.6 x 10^-19 Coulomb

B. -1.6 x 10^-19 Coulomb

C. 4.8 x 10^-10 Coulomb

D. None of these

71. The charge of electron was experimentally discovered by

A. Goldstein

B. Chadwick

C. Millikan

D. Thomson

72. How many independent properties are required to completely fix the equilibrium state of a pure gaseous compound?

A. 0

B. 1

C. 2

D. 3

73. Which of the following thermodynamic relations is incorrect?

A. TdS = dU + pdV

B. TdS = dH – V dp

C. U = Q - W

D. H = U - pV

74. If air is at a pressure, p, of 3200 lbf/ft2

and at a temperature, T, of 800 R, what is the specific volume, v? (R = 53.3 ft-lbf/lbm-R and air can be modeled as an ideal gas)

A. 9.8 ft3/lbm

B. 11.2 ft3/lbm

C. 13.3 ft3/lbm

D. 14.2 ft3/lbm

75. Steam at 1000 lbf/ft2 pressure and 300 R has a specific volume of 6.5 ft3/lbmand a specific enthalpy of 9800 lbf-ft/lbm. Find the internal energy per pound mass of steam

A. 2500 lbf-ft/lbm

B. 3300 lbf-ft/lbm

C. 5400 lbf-ft/lbm

D. 6900 lbf-ft/lbm

76. Which of the following is true for water at a reference temperature where enthalpy is zero?

A.Internal energy is negative.

B. Entropy is non-zero.

C. Specific volume is zero.

D. Vapor pressure is zero.

77. 3.0 lbm of air are contained at 25 psiaand 100 F. Given that Rair = 53.35 ft-lbf/lbm-F, what is the volume of the container?

A. 10.7 ft3

B. 14.7 ft3

C. 15 ft3

D. 24.9 ft3

78. On what plane is the Mollier diagram plotted?

A. p-V

B. p-T

C. h-s

D. s-u

79. The first law of thermodynamics is based on which of the following principles?

A. conservation of mass

B. the enthalpy-entropy relationship

C. action-reaction

D. conservation of energy

80. What is the value of the work done for a closed, reversible, isometric system?

A. zero

B. positive

C. negative

D. positive or negative

81. A 5 m3 vessel initially contains 50 kg of liquid water and saturated water vapor at a total internal energy of 27,300 kJ. Calculate the heat requirement to vaporize all of the liquid.

A. 100,000 kJ

B. 200,000 kJ

C. 300,000 kJ

D. 400,000 kJ

82. Find the change in internal energy of 5 lbm of oxygen gas when the temperature changes from 100 F to 120 F. cv = 0.157 BTU/lbm-R.

A. 14.7 BTU

B. 15.7 BTU

C. 16.8 BTU

D. 147 BTU

83. Water (specific het cv = 4.2 kJ/kg k) is being heated by a 1500 W heater. What is the rate of change in temperature of 1 kg of the water?

A. 0.043 K/s

B. 0.179 k/s

C. 0.357 k/s

D. 1.50 K/s

84. One kilogram of water (cv = 4.2 kJ/kg K) is heated by 300 BTU of energy. What is the change in temperature, in K?

A. 17.9 k

B. 71.4 K

C. 73.8 K

D. 75.4 K

85. Determine the change in enthalpy per lbm of nitrogen gas as its temperature changes from 500 F to 200 F. (cp = 0.2483 BTU/lbm-R)

A. -74.49 BTU/lbm

B. -72.68 BTU lbm

C. -68.47 BTU/lbm

D. 63.78 BTU/lbm

86. What is the resulting pressure when one pound of air at 15 psia and 200 F is heated at constant volume to 800 F?

A. 15 psia

B. 28.6 psia

C. 36.4 psia

D. 52.1 psia

87. What horsepower is required to isothermally compress 800 ft3 of air per minute from 14.7 psia to 120 psia?

A. 13,900 hp

B. 108 hp

C. 256 hp

D. 28 hp

88. Which of the following relations defines enthalpy?

A.h=u+P/T

B.h=u+pV

C.h=u+P/V

D.h=pV+T

89. For an irreversible process, what is true about the total change in entropy of the system and surroundings?

A. dS=dQ/T

B. dS = 0

C. dS > 0

D. dS < 0

90. If 658 g of sucrose (molecular mass = 342 g) is dissolved in 2000 g of water (essentially 2 L), what will be the freezing point of this solution? A. -0.51OCB. -1.86OCC. -1.79OCD. -6.58OC

91. A carnot heat engine receives 500KJ of heat per cycle from a high-temperature source at 600 °C and rejects heat a low temperature sink at 25°C. Determine the thermal efficiency of this Carnot engine

A. 93.33%

B. 65.86%

C. 6.67%

D. 64.15%

92. Three moles of an ideal gas are compressed slowly and isothermally from a volume of 3 to 2.5 ft3, at a temperature of 450K. How much work is done?A. -2.05 kJB. -3.45 kJC. -5.67 kJD.-9.32 kJ

93. A certain gas, with cP=0.529 Btu/lb.RO and R=96.2 ft.lb/lb.OR, expands from 5 cu ft and 80 OF to 15 cu ft while the pressure remains constant at 15.5 psia. Compute T2.

A. 240 OR

B. 1620 OR

C. 26.67 OR

D. 180 OR

94. If 10 g of ice melts at 0OC, the total quantity of heat absorbed is

A. 3.35 kJ

B. 80 kJ

C. 800 kJ

D. 8000 kJ

95. A pressure gage register 50 psig in a region where the barometer is 14.52 psia. Find the absolute pressure in Pascals.

A. 445 Pa

B.435 kPa

C.434 kPa

D.445 kPa

96. At 5 atm pressure and 70OC, how many moles are present in 3L of O2 gas?

A. 0.036

B. 0.267

C. 0.533

D. 1.60

97. The ratio in water of oxygen to hydrogen by mass is

A. 1:9

B. 8:1

C. 1:2

D. 1:8

98. It is the calculation of both energy balances and material balances in a chemical system.

A. molarity

B. molality

C. calorimetry

D. stoichiometry

99. It is an impure form of carbon, formed when coal is heated strongly in the absence of air.

A. graphite

B. austentite

C. coke

D. wrought carbon

100. What pressure must be applied to 225mL of gas at 1atm to reduce its volume to 100mL?A. 2.25 kPaB. 227.98 kPaC. 3.27 kPaD. 357.23 kPa

End of GEAS 1…

TO GOD BE THE GLORY!!!