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Compre Reviewer > Compre-Midterms > Flashcards

Compre-Midterms Flashcards

1
Q
  1. An iron block weighs 5 Newton and has volume of 200 cm3. What is the density of the block? g = 9.7m/s2.
    a. 2485 kg/m3
    b. 2577 kg/m3
    c. 2584 kg/m3
    d. 2549 kg/m3
A

b. 2577 kg/m3

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2
Q
  1. A double purpose tank 18 ft wide, 24 ft long and 4 ft depth is filled with water. What is the weight of water in the tank?
    a. 45 tons
    b. 34 tons
    c. 54 tons
    d. 55 tons
A

c. 54 tons

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3
Q
  1. A substance temperature was 62 oF. What is the temperature in deg C?
    a. 54
    b. 45.54
    c. 16.7
    d. 94.44
A

c. 16.7

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4
Q
  1. At what temperature readings do the Fahrenheit and Celsius scales have the same value?
    a. -35 degrees
    b. -40 degrees
    c. -45 degrees
    d. None of the above
A

b. -40 degrees

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5
Q
  1. If the sum of P15,000 is deposited in an account earning interest at the rate of 8% compounded quarterly, what will it become at the end of 5 years?
    a. P22,039.92
    b. P32,866.85
    c. P22,289.21
    d. None of the above
A

c. P22,289.21

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6
Q
  1. An employee has a promissory note, due 5 years hence, whose maturity value is P70,000. If the rate of interest is 12% compounded semi-annually, what is the value of this note now?
    a. P39,720.82
    b. P96,675.79
    c. P39,087.63
    d. None of the above
A

c. P39,087.63

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7
Q
  1. A train changes its speed uniformly from 60 mph to 30 mph in a distance of 1,500 ft. What is its acceleration?
    a. -1.94ft/s2
    b. 2.04 ft/s2
    c. -2.04 ft/s2
    d. 1.94 ft/s2
A

a. -1.94ft/s2

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8
Q
  1. A car starts from rest and has constant acceleration of 3 ft/s2. Find the average velocity during the first 10 seconds of its motion.
    a. 13 ft/s
    b. 14 ft/s
    c. 15 ft/s
    d. 12 ft/s
A

c. 15 ft/s

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9
Q
  1. A ball is dropped from a height of 60 meters above the ground. How long does it take to hit the ground? (acceleration due to gravity is 9.81 m/s2)
    a. 2.1 sec
    b. 5.5 sec
    c. 1.3 sec
    d. 3.5 sec
A

d. 3.5 sec

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10
Q
  1. A 3,200 lb elevator cab is supported by a cable in which the maximum safe tension is 4,000 lb. What is the greatest upward acceleration the elevator can have?
    a. 32.2 ft/s2
    b. 8.05 ft/s2
    c. 128.8 ft/s2
    d. 4.025 ft/s2
A

b. 8.05 ft/s^2

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11
Q
  1. The coefficient of static friction between a box and the flat bed of a truck is 0.6. What is the maximum acceleration the truck can have along the level ground if the box is not to slide?
    a. 1320 N-m
    b. 990 N-m
    c. 495 N-m
    d. 1230 N-m
A

d. 1230 N-m

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12
Q
  1. A generator was bought for P30,000, 6 years ago. It will have a salvage value of P3,000, 4 years from now. It is sold now for P8,000. Its sunk cost in pesos if sinking fund method is used with 6% interest to:
    a. 7,700
    b. 7,900
    c. 6,700
    d. 6,900
A

a. 7,700

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13
Q
  1. A generator was bought for P30,000, 6 years ago. It will have a salvage value of P3,000, 4 years from now. It is sold now for P8,000. Its sunk cost in pesos if sinking fund method is used with 6% interest to:
    a. 7,700
    b. 7,900
    c. 6,700
    d. 6,900
A

a. 7,700

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14
Q
  1. The drum of a steam generating unit is 200 mm in diameter. The steam pressure is 3.601325 MPaa. If the shell thickness is 30mm, calculate the circumferential stress and the longitudinal stress?
    a. 5.833 Mpa and 2.967 Mpa
    b. 12.833 Mpa and 6.42 Mpa
    c. 11.67 Mpa, 5.83 Mpa
    d. None of the above
A

a. 5.833 Mpa and 2.967 Mpa

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15
Q
  1. A cylindrical pressure vessel is fabricated from steel plate which have thickness of 20 mm. The diameter of pressure vessel is 500 mm and its length is 3 m. Determine the maximum internal pressure which can be applied if the stress in the steel is limited to 140 MPa.
    a. 70 Mpa
    b. 11.2 MPa
    c. 22.4 MPa
    d. 35 MPa
A

a. 70 Mpa
b. 11.2 MPa

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16
Q
  1. A boiler 6 ft in diameter with ½ inch plate has 70% longitudinal effiency. If the allowable internal pressure is 10,000 psi. Find the allowable pressure.
    a. 1.029 x 106
    b. 1.342 x 106
    c. 1.4344 x 106
    d. 0.67 x 106
A

a. 1.029 x 10^6

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17
Q
  1. A water reservoir of 12 m high and 8 m diameter is to be completely filled with water. Find the minimum thickness of the reservoir plating if the stress is limited to 40 MPa.
    a. 11.77 mm
    b. 10.25 mm
    c. 13.18 mm
    d. 12.6 mm
A

a. 11.77 mm

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18
Q
  1. Find the limiting peripheral velocity of a rotating steel ring if the allowable stress is 140 MPa and the mass density of steel is 7850 kg/m3.
    a. 130.62 m/s
    b. 129.58 m/s
    c. 142.37 m/s
    d. 133.55 m/s
A

d. 133.55 m/s

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19
Q
  1. A triple riveted lap joint is fastened by 5-25 mm diameter rivets. The metal plate is 305 mm wide and 20 mm thick. If a 500 kg/mm axial load is applied. Which of the following value is not correct?
    a. Shearing stress in each rivet is 610 MPa
    b. Bearing stress in the plate is 598 MPa
    c. Maximum tensils stress is 293 MPa
    d. None of the above
A

d. None of the above

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20
Q
  1. Find the necessary force to punch out a 20 mm diameter hole from a metal plate 5 mm thick, if the ultimate stress in shear in the plate is 20 MPa?
    a. 6238 N
    b. 5926 N
    c. 6283 N
    d. 3146 N
A

c. 6283 N

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21
Q
  1. A hole is to be punched out to a plate having an ultimate shearing stress of 310 MPa. If the compressive stress is the plate is limited to 420 MPa. What is the maximum plate thickness in which a hole of 75 mm diameter can be punched?
    a. 25.4 mm
    b. 31.6 mm
    c. 35.3 mm
    d. 29.4 mm
A

a. 25.4 mm

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22
Q
  1. How much energy is required to punch a 25 mm diameter hole on a 19 mm thick plate if the ultimate strength in the shear of the plate is 400 MPa?
    a. 596.9 J
    b. 5670 J
    c. 518.5 J
    d. 512.35 J
A

b. 5670 J

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23
Q
  1. Determine the diameter of a hollow steel type that will carry a tensile load of 500 KN at a stress of 140 Mpa. Assume the wall thickness to be 1/10 of the outside diameter.
    a. 106.72 mm
    b. 112.39 mm
    c. 135.32 mm
    d. 142.26 mm
A

b. 112.39 mm

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24
Q
  1. The maximum shear stress in circular shaft is directly proportional to the
    a. speed
    b. cross-sectional area
    c. polar moment of inertia
    d. None of the above
A

c. polar moment of inertia

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25
Q
  1. A kind of valve used un pipeline to prevent backflow of liquid
    a. Gate Valve
    b. Check Valve
    c. Plug Valve
    d. Regulation Valve
A

b. Check Valve

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26
Q
  1. Which of the following property of water is not true?
    a. It is compressible
    b. It has higher density than oil
    c. Its boiling temperature lowers at higher altitude
    d. At its purest, it is a perfect insulator
A

a. It is compressible

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27
Q
  1. An instrument which measures the depth of rainfall
    a. Hydrometer
    b. Pluviometer
    c. Manometer
    d. None of the above
A

b. Pluviometer

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28
Q
  1. It is used to control the flow of liquid.
    a. Gate Valve
    b. Check Valve
    c. Plug Valve
    d. Regulatory Valve
A

d. Regulatory Valve

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29
Q
  1. Is a conduit in which a liquid flows with free surface.
    a. Dam
    b. Spill Way
    c. Open Channel
    d. Caisson
A

c. Open Channel

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30
Q
  1. Is a conduit in which a liquid flows with free surface.
    a. Dam
    b. Spill Way
    c. Open Channel
    d. Caisson
A

a. Young’s modulus

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31
Q
  1. Pick out the item that does not belong to computer
    a. Mouse
    b. OCR
    c. MICR
    d. Plotter
A

d. Plotter

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32
Q
  1. What type of memory the computer utilizes first during data processing
    a. Hard disk memory
    b. ROM
    c. Floppy disk
    d. Cache memory
A

d. Cache memory

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33
Q
  1. The following equipment are serially interfaced with PC except:
    a. Mouse
    b. Modem
    c. Joystick
    d. Printer
A

d. Printer

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34
Q
  1. Processors of all computers whether micro, mini or mini-frame must have:
    a. Primary storage
    b. ALU
    c. Control Unit
    d. All of the above
A

d. All of the above

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35
Q
  1. Processors of all computers whether micro, mini or mini-frame must have:
    a. Primary storage
    b. ALU
    c. Control Unit
    d. All of the above
A

d. All of the above

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36
Q
  1. Who is known as the “FATHER” of the computer?
    a. Herman Hollerith
    b. Charles Babbage
    c. Blaise Pascal
    d. Joseph Jacquard
A

b. Charles Babbage

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37
Q
  1. A collection of 8 bits is known as
    a. Byte
    b. Word
    c. Record
    d. File
A

a. Byte

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38
Q
  1. No computer can do anything without
    a. Program
    b. Memory
    c. Chip
    d. Output device
A

a. Program

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39
Q
  1. Computer memory
    a. Perform all calculations
    b. Is externally limited
    c. Reverse input data
    d. Is better than human memory
A

b. Is externally limited

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40
Q
  1. The CPU can perform read or write operation at any point in time in:
    a. ROM
    b. PROM
    c. EPRON
    d. RAM
A

d. RAM

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41
Q
  1. The first mechanical computer designed by Charles Babbage was known as
    a. Analytical Engine
    b. Calculator
    c. Abacus
    d. Processor
A

a. Analytical Engine

42
Q
  1. The heat transfer during adiabatic process is
    a. Zero
    b. Dependent on temperature
    c. Reversible
    d. Irreversible
A

a. Zero

43
Q
  1. It is the heat that does not affect the temperature of the substance but change its state
    a. Specific Heat
    b. Latent Heat
    c. Heat Transfer
    d. None of the above
A

b. Latent Heat

44
Q
  1. Energy posses by a body due to its speed of velocity
    a. Kinetic energy
    b. Potential energy
    c. Internal energy
    d. Heat
A

a. Kinetic energy

45
Q
  1. Energy posses by a body by virtue of molecular activity or vibration of atom within a molecule
    a. Kinetic energy
    b. Potential energy
    c. Internal energy
    d. Heat
A

c. Internal energy

46
Q
  1. It is a branch of physics which deals with fluid at rest
    a. Hydraulics
    b. Hydrostatics
    c. Fluid Mechanics
    d. None of the above
A

b. Hydrostatics

47
Q
  1. It is defined as the mass per unit volume
    a. Density
    b. Specific Gravity
    c. Kilogram
    d. None of the above
A

a. Density

48
Q
  1. In preparation for the college education of his son, DJ plans to deposit equal amounts money for five consecutive years starting one year from now. If he wants his son to be able to withdraw P1,000,000 ten years from now at 8% interest compounded annually, what is the amount of each deposit?
    a. P190,651.28l
    b. P161,010.09
    c. P116,010.09
    d. None of the above
A

c. P116,010.09

49
Q
  1. A condenser vacuum gauge reads 715 mm Hg when the barometer stands at 757 mm Hg. State the absolute pressure in the condenser in kPa.
    a. 5.6 kPa
    b. 7.9 kPa
    c. 6.5 kPa
    d. 4.5 kPa
A

a. 5.6 kPa

50
Q
  1. Find the resultant value and the angle of the following pull efforts exerted by many men whose pull is along the horizontal with 200lb, a pull 300lb is 60 degrees above the horizontal to the right while the 100lb pull is 45 degrees above the horizontal to the left; another 200lb pull is vertically down.
    a. R=310lbs, 25o
    b. R=315lbs, 25o
    c. R=315lbs, 30o
    d. R=310lbs, 30o
A

a. R=310lbs, 25o

51
Q
  1. The SI unit of atmospheric pressure
    a. N/m2
    b. psi
    c. atmosphere
    d. torr
A

d. torr

52
Q
  1. Two 10lb weights are suspended at opposite ends of a rope which passes over a light frictionless pulley. The pulley is attached to a chain which goes to the ceiling. What is the tension on the rope?
    a. 8 lbs
    b. 10 lbs
    c. 12 lbs
    d. 20 lbs
A

b. 10 lbs

53
Q
  1. The resultant of two 100N forces is 50N. The angle between the two 100N forces is ___
    a. 28.995
    b. 30
    c. 151.05
    d. None of the above
A

c. 151.05

54
Q
  1. A safe weighing 600lbs is to be lowered at a constant speed down skids 8ft long from a truck 4ft high. If the coefficient of sliding friction between safe and skids is 0.30, what will you do with the safe?
    a. Nothing
    b. Hold Back
    c. Push Down
    d. Lift Safe
A

b. Hold Back

55
Q
  1. A car travels 30km east and then 40km north, or a total distance of 70km in a time of one hour. A. What is the average speed?
    a. 40 kph
    b. 50 kph
    c. 60 kph
    d. 70 kph
A

d. 70 kph

56
Q
  1. A device that converts from decimal to binary number is ___________
    a. Decoder
    b. Encoder
    c. CPM
    d. Converter
A

b. Encoder

57
Q
  1. In an electronic circuit, which will function in some desired manner when one or more a high or low voltage signals are fed to its put
    a. Gate
    b. Power Amplifier
    c. Transistor
    d. Power Supply
A

a. Gate

58
Q
  1. In an electronic circuit, which will function in some desired manner when one or more a high or low voltage signals are fed to its put
    a. Gate
    b. Power Amplifier
    c. Transistor
    d. Power Supply
A

b. AND

59
Q
  1. A single digital word storage device is called ___________
    a. Gate
    b. Clock
    c. Timer
    d. Register
A

d. Register

60
Q
  1. Microprocessor can be applied to make __________
    a. Calculator
    b. Many other kind of digital system
    c. Computers
    d. All of these
A

a. Calculator
b. Many other kind of digital system
c. Computers
Answer:
d. All of these

61
Q
  1. A copper bus bar is ½ inch by 3 ½ inches, What will be its equivalent cross sectional area in circular mil (CM)?
    a. 2,822,196
    b. 2,228,169
    c. 1,282,296
    d. 1,374,447
A

b. 2,228,169

62
Q
  1. What is the size in square millimeter (mm2) is the cable 250 MCM size?
    a. 118.656
    b. 126.675
    c. 112.565
    d. 132.348
A

b. 126.675

63
Q
  1. The substation bus bar is made up of 2-inches round copper bars 20 feet long. What is the resistivity is 1.724 x 10 – 6ohm-cm?
    a. 7.21 x 10- 5Ω
    b. 5.18 x 10 - 5Ω
    c. 13.80 x 10 - 5Ω
    d. 2.96 x 10 - 5Ω
A

b. 5.18 x 10 ^-5 Ω

64
Q
  1. The substation bus bar is made up of 2-inches round copper bars 20 feet long. What is the resistivity is 1.724 x 10 – 6ohm-cm?
    a. 7.21 x 10- 5Ω
    b. 5.18 x 10 - 5Ω
    c. 13.80 x 10 - 5Ω
    d. 2.96 x 10 - 5Ω
A

a. 10 m

65
Q
  1. A 2m of annealed copper 2.5 cm in diameter is drawn until its resistance is 100 times the initial resistance, its diameter afterward is…..
    a. 0.97cm
    b. 0.79cm
    c. 0. 25cm
    d. 0. 52 cm
A

b. 0.79cm

66
Q
  1. A 2m of annealed copper 2.5 cm in diameter is drawn until its resistance is 100 times the initial resistance, its diameter afterward is…..
    a. 0.97cm
    b. 0.79cm
    c. 0. 25cm
    d. 0. 52 cm
A

a. – 1.94 ft/sec^2

67
Q
  1. A ballast bag is dropped from a balloon that is 300 m above the ground and rising at 13 m/sec. For the bag, find its position 5 sec after being released.
    a. 357.6 m
    b. 57.6 m
    c. 242.4 m
    d. 300 m
A

c. 242.4 m

68
Q
  1. An airplane is in level flight at a velocity of 300 mph and an altitude of 5,000 ft when it drops a bomb. What will the bomb’s velocity in ft/sec on impact?
    a. 718
    b. 440
    c. 567
    d. 300
A

a. 718

69
Q
  1. A 3,500 kg car accelerates from rest. The constant forward tractive force of the car is 1,000 N, and the constant drag is 150 N. What distance will the car travel in 3 sec?
    a. 0.19 mm
    b. 1.3 m
    c. 1.1 m
    d. 15 m
A

c. 1.1 m

70
Q
  1. A 3,500 kg car accerates from rest. The constant forward tractive force of the car is 1,000 N, and the constant drag force is 150 N. What distance will the car travel in 3 sec?
    a. 0.19 mm
    b. 1.3 m
    c. 1.1 m
    d. 15 m
A

c. 1.1 m

71
Q
  1. A 120 lb woman is in elevator cab whose upward acceleration of is 7 ft/sec2. What force does she exert on the floor of the cab?
    a. 146 lbs
    b. 94 lbs
    c. 720 lbs
    d. 120 lbs
A

a. 146 lbs

72
Q
  1. A bowling ball with an initial velocity of 3 m/sec rolls along a level floor for 50 m before coming to a stop. What is the coefficient of rolling friction?
    a. 0.09
    b. 0.9
    c. 0.0092
    d. 0.0062
A

c. 0.0092

73
Q
  1. A wheel of 40 cm radius rotates on a stationery axle. It is uniformly speeded up from rest to a speed of 900 rpm in a time of 20 sec. Find the tangential acceleration of a point on its rim.
    a. 1.88 m/sec2
    b. 0.94 m/sec2
    c. 3.76 m/sec2
    d. 8.84 m/sec2
A

a. 1.88 m/sec2

74
Q
  1. A man keeps a 1 kg toy airplane flying horizontally in a circle holding onto a 1.5 m long string attached to its wing tip. The string is always in the plane of the circular flight path.If the plane flies at 10 m/sec, find the tension in the string.
    a. 28 N
    b. 15 N
    c. 67 N
    d. 18 N
A

c. 67 N

75
Q
  1. A flywheel of moment of inertial 10slugg-ft2is rotating at 90 rad/sec. What constant torque is required to slow it down to 40 rad/sec in 20 sec?
    a. – 25-fb
    b. 25-fb
    c. 62.5 lb-ft
    d. – 62.5 lb-ft
A

a. – 25-fb

76
Q
  1. The sum of the integers between 288 and 887 that are exactly divisible by 15 is
    a. 23,700
    b. 21,800
    c. 22,815
    d. 24,150
A

a. 23,700

77
Q
  1. A spring with a constant of 50 lbf/ft is hung vertically and a mass is attached to its end. The springend displaces 3 in. from its equilibrium position. The same mass is removed from the first spring ans is attached to the end of a second, different spring. If the displacement of the second spring is 2.5 in., find its constant.
    a. 63 lbf/ft
    b. 60 lbf/ft
    c. 46 lbf/ft
    d. 56 lbf/ft
A

b. 60 lbf/ft

78
Q
  1. The drum of a steam generating unit is 200mm in diameter. The steam pressure is 3.601325 MPaa. If the shell thickness :
A

Bonus

79
Q
  1. Any whole number which can be either negative, zero or positive. Such numbers are called:
    a. Integer
    b. Even
    c. Odd
    d. Prime
A

a. Integer

80
Q

Find the equation of the line passing through (2 , 3) that forms the area of 12 with the coordinate axes.

a. 3x+4y=24
b. 4x+4y=21
c. 6x+4y=24
d. 2x+3y=21

A

c. 6x+4y=24

81
Q

refining and alloying of those metals.

a. Chemical Metallurgy
b. Physical Metallurgy
c. Mechanical Metallurgy
d. Electro Metallurgy

A

a. Chemical Metallurgy

82
Q

Which of the following is NOT true about sub-atomic particles?

a. protons, neutrons are found in nucleus
b. electrons have negative charges
c. mass of electron equals mass of proton
d. protons and electrons attract each other

A

c. mass of electron equals mass of proton

83
Q
  1. A ball is dropped from a building 100m high. If the mass of the ball is 10g, after what time will the ball strike the earth?

a. 4.52 s
b. 4.42 s
c. 5.61 s
d. 2.45 s

A

a. 4.52 s

84
Q
  1. A set of elements that is taken without regard to the order in which the elements are arranged is called:
    a. Combination
    b. Permutation
    c. Sequence
    d. Series
A

a. Combination

85
Q

A man standing on the foot of a tower throws a ball vertically upwards at a certain velocity . On its way up, the time for the ball to reach the top of the tower is 1 second. On its way up, the time for the ball to reach the top of the tower is 2 seconds. How high is the tower in feet?

a. 9.81 ft
b. 8.81 ft
c. 32.2 ft
d. 31.2 ft

A

c. 32.2 ft

86
Q

The temperature inside a furnace is 320°Cand the temperature of the outside is – 10°C. What is the temperature difference in °F?

a. 172.2°F
b. 558°F
c. 594 °F
d. 183.3 °F

A

c. 594 °F

87
Q

. Determine the height on a wall 10m away to which a firefighter can project water from the hose if the angle in which the water is projected is 35° with the ground and the speed of the water at the nozzle is 15m/s. The nozzle is 1m above the ground.

a. 3.75 m
b. 4.75 m
c. 5.75 m
d. 6.75 m

A

b. 4.75 m

88
Q

A ball is fired vertically towards the surface of the earth with an initial velocity of 1m/s from a building 100m high. If the mass of the ball is 10g, after what time will the ball strike the earth?

a. 4.52 s
b. 4.42 s
c. 5.61 s
d. 2.45 s

A

b. 4.42 s

89
Q

If an air bag in a car needs 44.8 L of gas when filled, how many grams of NaN3 are needed to fill the bag with nitrogen gas at standard temperature and pressure? Remember that one mole of any gas will occupy 22.4 L at STP. The balanced chemical is…

a. 56 grams
b. 87 grams
c. 130 grams
d. 1.3 grams

A

b. 87 grams

90
Q
  1. Two thousand (2000) kg of steel containing 8% nickel is to made by mixing a steel containing 14% nickel with another containing 6% nickel. How much of each is needed?

a. 1500 kg of steel w/ 14% nickel, 500 kg of steel w/ 6% nickel
b. 750 kg of steel w/ 14% nickel, 1250 kg of steel w/ 6% nickel
c. 500 kg of steel w/ 14% nickel, 1500 kg of steel w/ 6% nickel
d. 1250 kg of steel w/ 14% nickel, 750 kg of steel w/ 6% nickel

A

c. 500 kg of steel w/ 14% nickel, 1500 kg of steel w/ 6% nickel

91
Q
  1. A 3m wire with a diameter of 2 cm has a conductivity of 9000 mho per cm. What is its resistance?

a. 10.61 Ω
b. 10.16mΩ
c. 10.61 mΩ
d. 10.16 Ω

A

c. 10.61 mΩ

92
Q
  1. Which of the following is not a secondary cell?

a. Silver-zinc
b. Nickel-iron
c. Silver-oxide
d. Lead-acid

A

c. Silver-oxide

93
Q
  1. Which of the following is the main function of a dc motor?

a. to generate power
b. to change mechanical energy to electrical energy
c. to change electrical energy to mechanical energy
d. to change chemical energy to mechanical energy

A

c. to change electrical energy to mechanical energy

94
Q
  1. A car moving at 70 kph has a mass of 1700 kg. What force is necessary to decelerate it at a rate of 40 cm/s2?

a. 4250 N
b. 0.680 N
c. 680 N
d. 42.5 N

A

c. 680 N

95
Q
  1. A new boiler was installed by a textile plant at a cost of P300,000 and projected to have a useful life of 15 years. At the end of its life, it is estimated to have a salvage value of 10% of its purchase price.
    Determine its capitalized cost if interest is 18% compounded annually.a. P342,640
    b. P371,654
    c. P324,604
    d. P317,564
A

c. P324,604

96
Q
  1. In a certain population, 10% of the people can be classified as being high risk for a heart attack. Three people are randomly selected from this population. What is the probability that exactly one of the three is high risk?

a. 0.406
b. 0.312
c. 0.243
d. 0.187

A

c. 0.243

97
Q
  1. Suppose a rare disease infects one out of every 1000 people in a population. And suppose that there is a good, but not perfect, test for this disease: if a person has the disease, the test comes back positive 99% of the time. On the other hand, the test also produces some false positives: 2% of uninfected people are also test positive. And someone just tested positive. What are his chances of having this disease?

a. 0.07
b. 0.06
c. 0.05
d. 0.04

A

c. 0.05

98
Q
  1. The Bureau of Aquatic Resources often tag and release subjects in order to estimate size and degree of certain features in the population. 10 species of a certain population thought to be extinct are caught, tagged, and released in a certain area. After a period of time, a random sample of 15 of the type of species is selected in the area. What is the probability that 5 of those selected are tagged species if there are 25 species of this type in the area?a. 0.4618
    b. 0.3751
    c. 0.2315
    d. 0.1954
A

c. 0.2315

99
Q
  1. This is the condition of overabundance of nutrients in water that leads to the proliferation of
    algae.

A. Algal Bloom
B. Eutrophication
C. Oligotrophication
D. Mesotrophication

A

B. Eutrophication

100
Q
  1. This chemical treatment makes use of a polyelectrolyte to bind finely divided solids.

A. Coagulation
B. Chemical Flocculation
C. Chemical Precipitation
D. Neutralization

A

B. Chemical Flocculation

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