It explains combustion as a result of loss of a substance.a. Phlogiston b. Roastingc. Reductiond. Fission

The volume of a definite quantity of dry gas is inversely proportional to the pressure provided the temperature remains constant.

a. Charles’ Lawb. Boyle’s Law c. Gay-Lussac’s Lawd. Dalton’s Law

It refers to matter that do not have definite form or structure.a. Amorphous b. Morphous c. Transientd. Extrinsic

Three grams of sulphur dissolved in 200 g of naphthalene C10H8, was found decreasing the freezing point of the solvent to 0.72 ⁰C. Find the molecular weight of the solute. (Kf C10H8 = 6.9 ⁰C/molar)a. 351.16 g/moleb. 115.32 g/mole c. 135.61 g/mole d. 151.23 g/mole

Substance having a pH level less than 7a. acidb. base c. salt d. hydrate

It is the enthalpy change associated with the condensation of gaseous positive and negative ion into a crystal.

a Raoult’s Law b. Lattice Energy c. Enthalpy Of Solutiond. Partition Coefficient

It is a product of the weathering of complex silicates, particularly of feldspars which are abundant minerals.

a. clay b. chalkc. pyrited.diamond

Electrons occupy all the orbitals of a given subshell singly before pairing begins. These unpaired electrons have parallel spins. This is known as:

a. Building Up Principleb. Aufbau Principle c. Hund’s rule d.David’s rule

This law states that at constant temperature the volume of a sample of gas varies inversely with the pressure.

a. Avogadro’s Law b. Boyle’s Law c. Charle’s Law d. Gay-Lussac’s Law

It is the scattering of light by colloidal particlesa. Mott Scaterringb. Tyndall Effect c. Rayleigh Scattering d. Wolf Effect

Consider H3AsO3, Arsenic acid (H=1.01,As=74.9,O=16.0).How many mole is 1kg of H3AsO3?

a. 7.94 moles b. 6.94 molesc. 5.94 molesd. 8.94 moles

It is customary to indicate accuracy by using a certain numbers of figures or digits.

a. atomic mass unitb. International systemc. significant figures d. supplementary units

It is required for organic compounds.a. hydrogenb. oxygenc. borond. carbon

Term used to denote the technology of treating a mined ore to obtain a product higher on concentration of a wanted mineral from the unwanted rock mass in which it occurs

a. ore dressing b. galvanizationc. alloyingd. filtering

It states that, "If a stress is placed on a system on equilibrium whereby the equilibrium is altered, that change will take place which tends to relieve or neutralize the effect of the added stress".a. Le Chatelier's Principle b. Snell's Lawc. Huygen's Principled. Avogrado's Law

The energy possessed by a substance that allows it to be changed into a new substance.a. Chemical energy b. Physical energyc. Potential energyd. Nuclear energy

If heat is absorbed by the system during a chemical change, it is called as:a. exothermalb. endothermalc. endothermic d. exothermic

Who determined the quantitative relationship between the amount of electricity used in

electrolysis and the amount of chemical reaction that occurs?: a. Ernest Rutherford b. Michael Faraday c. Marie Curie d. John Dalton

It is considered as derivatives of ammonia in which one or more of the hydrogens have been replaced by the alkyl or aryl group. It is characterized by unpleasant odors

a. Alkanes b. Esters c. Amines d. Nitriles

Calculate the molar concentration of a solution that contains 15g of potassium hydroxide in 225ml of solution.

a.1.2 M b. 11.9 M c. 4.46 M d. 2.60 M

Calculate the ratio of the rate of diffusion of hydrogen to the rate of diffusion of oxygen. How fast does hydrogen diffuse than oxygen? Given: Density of oxygen is 0.0899 g/L and the density of oxygen is 1.43 g/L.

a. One b. Two c. Three d. Four

What is the volume of 1 mole of a gas at 2 atm and 273 K?

a. 1.12 L b. 10L c.11.2L d. 112L

It is a borosilicate glass with a very low coefficient of thermal expansion, hence, it's wide for cooking and serving utensils.

a. Lime Glass b. Pyrex c. Silicones d. Zeotites

What is the mass in kilograms of 10.5 gal (39.7 L) of gasoline with a specific gravity of 0.82.

a. 10.5 kg b. 28 kg c. 33 kg d. 44 kg

It is a colorless solid capable of being cut into brilliant crystals is the hardest, must abrasive mineral known

a. Graphite b. Charcoal c. Diamond d. Silicon

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

a. Molarity b. Molality c. Calorimetry d. Stoichiometry

_________ involves the replacement of one of the atoms or groups of atoms attached to the carbon “Backbone” of the organic molecule.: a.halogination b. chemical reaction c. Addition reaction d. Substitution Reaction

Calculate the volume (in Litres) occupied by 7.40g of NH3 at STP (Standard Temperature, and Pressure)

a. 8.73L b. 10.73L c . 9.73L d. 12.73L

It is the Energy change accompanying a mole of electrons being added to a mole of a gaseous atoms or ions.

a. Electronic Affinity b. Bingling Energy

c . Biochemical Energy d. Fission

A 466g sample of Water is Heated from 8.50’C to 74.60’C. Calculate the amount of Heat Absorbed (in Kilo Joules) by the Water.

a. 130 KJ b. 129 KJ c . 192 KJ d. 160 KJ

A silicon chip used in an integrated circuit of a microcomputer has a mass of 5.68mg. How many silicon (Si) atoms are present in this chip?

a. 5.6x10-3 atoms b. b. 2.02x1010atoms c. 1.22x10 20 atoms d. 2.22x1020atoms

This Law states that if a process can be written as the sum of several stepwise processes, the Enthalphy change the total process equals the sum of the Enthalphy changes of the Various Steps.

a. Gauss Law b. Hess Law c . Boyles Law d. Newton’s Law

This process separates the components of a mixture on the basis of differences in particle size. It is used most often to separate a liquid from a solid.

a. Crystallization b. Extraction c. Filtration d. Chromatography

Sulfur Hexafluoride (SF6) is a colorless, odorless, very unreactive gas. Calculate the pressure (in atm) exerted by 1.82 moles of gas in a steel vessel of volume 5.43L at 45°C.a. 6.75 atm b. 7.75 atm c. 8.75 atm d. 9.75 atm

It is defined as the pressure exerted by a force of one newton acting on an area of one square meter.a. Kelvin b. Meter c. Pascal d. Newton

:A bottle of certain ceramic tile cleanser, which essentially a solution of hydrogen chloride, contains 130g of HCl and 750g of water. What is the percent by mass of HCl in this cleanser?

a. 15.7% b. 16.3% c. 14.8% d. 13.8%

A covalent bond between two atoms with different electronegativities, so that the electron density is unsymmetrically distributed.

a. Non- Polar bond b. Polar bond c. Single bond d. Triple bond

Which element has the highest ionization potential of its atom?

a. Hydrogen b. Oxygen c. Helium d. Zinc

It is the minimum amount of radioactive material needed to sustain a nuclear chain reaction.

a. Molar massb. Critical mass c. Molecular massd. Atomic mass unit

In the atmosphere, nitrogen dioxide reacts with water to produce nitric acid, which contributes to pollution by acid rain: 3NO2(g) + H2O(l) -----> 2HNO3(aq) + NO(g) How many grams of HNO3 are produced for every 1.0mol of NO2 that reacts? The molecular weight of HNO3 is 63.0amu.

a. 42 g HNO 3

b. 42 kg HNO3

c. 4.2 g HNO3

d. 42 mg HNO3

_________ states that a constant pressure and temperature, the volume of a gas is directly proportional to the number of moles present.

a. Boyle’s Lawb. Charle’s Lawc. Gay-Lussac’s Lawd. Avogrado’s Law

______ states that in the addition of polar reagents to alkenes, the positive portion of the reagents adds to the carbon atom in the double bond that already has the most hydrogen atoms.

a. Markovnikou’s rule b. Le Chatelier’s principlec. Lock-and-key theoryd. Pauli Exclusion Theory

_______ are atoms that have completely filled ns and np subshells, giving them great stability.

a. Alkali Metalsb. Noble Gases c. Halogensd. alkaline earth metals

_______ states that the partial pressure of a solvent over a solution is given by the vapor pressure of the pure solvent times the mole fraction of the solvent in the solution.

a. Dalton’s law of partial pressureb. de Broglie’s hypothesis c. Aufbau principled. Raoult’s Law

A hole is to be punched out of plate having a shearing strength of 40 ksi. The compressive stress in the punch is limited to 50 ksi. Compute the maximum thickness of plate from which a hole 2.5 inches in diameter can be punched.

a. 0.500 in b. 0.781 in c. 0.102 ind. 0.204 in

t = 2.5(50) / 4(40) = 0.781 inches

A hole is to be punched out of plate having a shearing strength of 40 ksi. The compressive stress in the punch is limited to 50 ksi. If the plate is 0.25 inches thick, determine the diameter of the smallest hole that can be punched

a. 0.800 in b. 0.871 in c. 0.435 in d. 0.600 in

D = 4(0.25)(40) / 50 = 0.800 inches

A large pipe, called a penstock in hydraulic work, is 1.5 m in diameter. It is composed of wooden staves bound together by steel hoops, each 300 sq. Millimetre in cross-sectional area, and is used to conduct water from a reservoir to power a house. If the maximum tensile stress permitted in the hoops is 130 MPa, what is the maximum spacing between hoops under a head of water of 30 m?

a. 17.7mm b. 77.1 mm c. 177 mm

d. 71.7 mm

(1000)(9.81)(30)(1.5)L = 2(300x10^-6)(130x10^6)L = 177 mm

At what angular velocity will the stress in a rotating steel ring equal to 150 MPa if its mean radius is 220 mm? The density of the steel is 7.85 Mg/m^3.

a. 19.87 rad/s b. 159 rad/s c. 138.2 rad/s d. 628 rad/s

ω = (1/0.22)(150x10^6 / 7850)^(1/2) = 628 rad/s

A pipe carry steam at 3.5 MPa has an outside diameter of 450 mm and a wall thickness of 10 mm. A gasket is inserted between the flange at one end of the pipe and a flat plate use to cap the end. How many 40-mm-diameter bolts must be used to hold the cap on if the allowable stress in the bolts is 80 MPa, of which 55 MPa is the initial stress?

a. 14 b. 15 c. 16 d. 17

N = (3.5x10^6)(0.45 – 2x0.01)^2 / [(0.04^2)(88–55)x10^6] = 16.18 round upN = 17

A pipe carry steam at 3.5 MPa has an outside diameter of 450 mm and a wall thickness of 10 mm. A gasket is inserted between the flange at one end of the pipe and a flat plate use to cap the end. What circumferential stress is developed in the pipe?

a. 75.3 MPa b. 37.65 MPa c. 78.75 MPa d. 39.38 MPa

σ = (3.5)(450 – 2x10) / [2(10)] = 75.3 MPa

It is the maximum safe stress that a material can carry

a. working stress b. Ultimate stress c. rupture strength d. Yield strength

It is the point at which there is an appreciable elongation of the material without any corresponding increase of load

a. Elastic limit b. Yield point c.Ultimate stress d. Point of rupture

This component measures the pulling (or pushing) action perpendicular to the section

a. Torque b. Bending moment c. Axial forces d. Shearing force

A steel rod having a cross-sectional area of 300 sq. Meters and a length of 150 m is suspended vertically from one end. It supports a tensile load of 20 kN at the lower end. If the unit mass of steel is 7850 kg/m^3 and E = 200x10^3 MN/m^2, find the total elongation of the rod.

a. 54.3 mm b. 40 mm c. 43.3 mm d. 35 mm

δ = [(7850)(9.8)(150^2) / 2(200X10^9)] + [(20000)(150)(1000^2) / 300(200X10^9)]δ = 54.3 mm

What is the theoretical maximum value of Poisson’s ratio of any given material subjected to a uniform triaxial stress.

a. 0 b. 1 c. 1/3 d. ½

A solid steel shaft 5 m long is stressed to 80 MPa when twisted through 4 degrees. Using G = 83 GPa, compute the shaft diameter.

a. 104 mm b. 138 mm c. 148 mm d. 160 mm

r = (80)(5) / [(4)(π/180)(83000)] = 69 mmd = 2(69) = 138 mm

A steel bar 50 mm in diameter and 2 m long is surrounded by a shell of cast iron 5 mm thick. Compute the load that will compress the combined bar a total of 0.8 mm in the length of 2m. For steel E = 200 GPa, and for cast iron E = 100 GPaa. 291 kN b. 240 kN c. 192 kN d. 420 kN

P = [(π/4)(0.05^2)(200x10^9)(0.0008)/2] + [(π/4)(0.06^2 -0.05^2)(100x10^9)(0.0008)/2]P = 192 kN

A solid steel shaft is not to twist through more than 3 degrees in a 6 m length when subjected to a torque of 12 kN.m. What maximum shearing stress is developed? Use G=83GPa.

a. 41.3 MPa b. 43.4 MPa c. 34.3 MPa d. 17.6 MPa

(π/4)d^4 = (12000)(6) / [(3)(π/180)(83x10^9)]d = 114 mm

τ = 16(12000) / [π(.114)^3]τ = 41.3 MPa

What is the minimum diameter of a solid steel shaft that will not twist through more than 3 degrees in a 6 m length when subjected to a torque of 12 kN.m? Use G=83GPa.

a. 114 mm b. 116 mm c. 118 mm d. 120 mm

(π/4)d^4 = (12000)(6) / [(3)(π/180)(83x10^9)]d = 114 mm

A steel rod 2.5 m long is secured between two walls. If the load on the rod is zero at 20 degree Celsius, compute the stress when the temperature drops to -20 degrees Celsius. The cross-sectional are if the rod is 1200 sq. mm, coefficient of linear expansion = 11.7 um/(m-

deg.C), and E = 200 GPa. Assume that the walls are rigid.

a. 69.3 MPa b. 96.3 MPa c. 93.6 MPa d. 69.3 Mpa

σ = (200x10^9)(11.7x10^-6)(20 - -20) = 93.6x10^6 Paσ = 93.6 MPa

Determine the maximum shearing stress in a helical steel spring composed of 20 turns of 20 mm-diamter wire on a mean radius of 80 mm when tha spring is supporting a load of 2 kN. Use G = 83 Gpa.

a. 110.6 MPa b. 112.3 MPa c. 120.6 MPa d. 134.6 Mpa

m = 80/10 = 8

τ = [16(2000)(0.08) / π(0.02)^3]x{[4(8)-1]/[4(8)-4] + (0.615/8)}τ = 120.6 Mpa

Determine the elongation in a helical steel spring composed of 20 turns of 20 mm-diamter wire on a mean radius of 80 mm when tha spring is supporting a load of 2 kN. Use G = 83 GPa.

a. 87.9 mm b. 78.9 mm c. 98.7 mm d. 89.7 mm

δ = 64(2000)(0.08^3)(20) / [(83x10^9)(0.02^4)]δ = 98.7 mm

These are components of the total resistance to sliding the portion to one side of the exploratory section past the other.

a. Torque b. Bending moment c. Axial forces d. Shear forces

Who first postulated that stress is proportional to strain in 1678?

a. Thomas Young b. Robert Hooke c. Andrew Pytel d. Charles Augustus

The position x of an experimental rocket moving along a long rail is measured to be x(t) = (4m/s)t + (7m/s2)t2 + (5m/s3)t3 – (0.35m/s4)t4 over the first 10s of its motion, where t is in seconds and x is in meters. Find the velocity of the rocket for the first 10 seconds.

a. 43 m/s b. 224 m/s c. 244m/s d. 2240 m/s

v = dx/dt = (4m/s) + (14m/s2)t + (15m/s3)t2 – (1.4m/s4)t3

Substituting t = 10 s, gives v = 244 m/s

Early in the nineteenth century, James Watt invented the steam engine. In order to convince people, who relied heavily on horses for mechanical work, he demonstrated how useful his steam engine was by utilizing a horse that lifted water from a well over a certain period of time and called the corresponding power expended “one horsepower”. Assume that water has a mass density of 1.0 x 103 kg/m3, that the well was 20m deep, and that the horse worked for 8 hours. How many liters of water did the horse raise from the well? Use the following constants: 1 hp = 746 Watts, g = 9.8 m/s2.

The work done of the tension in lifting a mass of water is given by: W = m g y where W = work, m = mass = pV, y = distance, V = volume, p= mass density,

The power is given by:

P = work /time,

Substituting all values, we get for V

V =

Since 1 m3 = 103 L, then V = 1.1 x 105L.

As provided in RA7925, a VAS provider needs to secure a franchise ifa. it is offered by a telecommunications entity whose proceeds of utility operations are not cross-subsidized.b. it does not discriminate other service providers against rates.c. it is offered by a telecommunications entity that uses a separate book of accounts for VAS.d. it puts up its own network.

According to the code of ethics, if you are employed in a company and you wish to engage in a business which may compete with your company, the most ethical thing to do is to

a. inform your employer about it b. have somebody run the business instead of you c. try to find new clientsd. keep your prices lower than your company’s

An investor has an option to purchase a tract of land that will be worth P20,000 in seven years. If the value of the land increases at 9% each year, how much should the investor be willing to pay now for this property?

a. P9,341 b. P10,941 c. P11,521 d. P12,015

Suppose that you make 12 equal annual deposits of P2,000 each into a bank account paying 8% interest per year. The first deposit will be made one year from today. How much money can be withdrawn from this bank account immediately after the 12th deposit?

a. P35,492 b. P36,218 c. 37,954 d. P38,755

What is the effective rate of interest if P1000 is invested at a nominal rate of 15% compounded quarterly?

a. 15.86% b. 16.86% c. 17.86% d. 18.86%

A man purchased a house for P425,000. In the first month that he owned the house, he spent P75,000 on repairs and remodeling. Immediately after the house was remodeled, he was offered P545,000 to sell the house. After some consideration, he decided to keep the house and have it rented for P4,500 per month starting two months after the purchase. He collected rent for 15 months and then sold the house for P600,000. if the interest rate was 1.5% per month, how much extra money did he make or lose by not selling the house immediately after it was remodeled?

a. P3,000 b.P4,000 c. P5,000 d. P6,000

On the day his grandson was born, a man deposited to a trust company a sufficient amount of money so that the boy could receive

five annual payments of P20,000 each for his college tuition fees, starting with his 18th birthday. Interest at the rate of 12$ per annum was to be paid on all amounts on deposit. There was also a provision that the grandson could elect to withdraw no annual payments and receive a single lump amount on his 25th birthday. The grandson chose this option. How much did the grandfather deposit?

a. P9,500 b. P10,500 c. P11,500 d. P12,500

A man bought an equipment costing P30,000 payable in 12 quarterly payments, each installment payable at the beginning of each period. The rate of interest is 24% compounded quarterly. What is the amount of each paymenta. P1,700 b. P2,700 c. P3,700 d. P4,700

A telecommunication company purchased an equipment for P53,000 and paid P1,500 for freight and delivery charges to the job site. The equipment has a normal life of 10 years with a trade-in value of P5,000 against the purchase of a new equipment at the end of the life. Determine the annual depreciation cost by the sinking fund method. Assume interest at 6.5% compounded annually.

a. P2,543 b. P3.,668 c. P4,215 d. P5,956

A telecommunication company purchased an equipment for P53,000 and paid P1,500 for freight and delivery charges to the job site. The equipment has a normal life of 10 years with a trade-in value of P5,000 against the purchase of a new equipment at the end of the life. Determine the annual depreciation cost by the sinking fund method. Assume interest at 6.5% compounded annually.

a. P2,543 b. P3.,668 c. P4,215 d. P5,956

A plant bought a machine for P200,000 and used it for 10 years, the life span of the equipment. What is the book value of the machine after 5 years of use? Assume a scrap value of P20,000. Use double declining balance method.

a. P43,648 b. P59,425 c. P65,536 d. P70,92

It occurs when a cutting action is applied as you would see with scissors, tin snips, or punches.

a.Direct shear c. Torsional shearb.Bending stress d. Torsional stress

It occurs when a member carries a load perpendicular to its long axis while being supported in a stable manner.

a.Direct shear c. Torsional shearb.Bending stress d. Torsional stress.

It is the internal resistance offered by a unit area of the material from which a member from which a member is made to an externally applied load.

a. stress b. strain c. moment d. torque

A certain support stand design to carry downward loads. Compute the stress in the square shaft at the upper part of the stand for a load of 27,000 lb. The line of action of the applied of the applied load is centered on the axis on the shaft, and the load is applied through a thick plate that distributes the force to the entire cross section of the stand.

a. 10,000psi b. 11,000psi c. 12,000psi d. 13,000psi

The proportional limit is the value of stress on the stress-strain diagram curve at which the curve first deviates from a straight line.

ci. Proportional limit cii. Elastic limitciii. Yield pointciv. Tensile point

It is the value of stress on the stress-strain curve at which the material has deformed plastically; that is, it will no longer return to its original size and shape after removing the load.

ci. Proportional limitcii. Elastic limit ciii. Yield pointciv. Tensile point

It is the value of stress on the stress-strain curve at which there is a significant increase in strain with little or no increase in stress.

ci. Proportional limitcii. Elastic limitciii. Yield point civ. Tensile point

It is the highest value of apparent stress on the stress-strain curve

ci. Proportional limitcii. Elastic limitciii. Yield pointciv. Tensile point

It is a measure of the stiffness of a material determined by the slope of the straight-line portion of the stress-strain curve

a. Modulus of elasticity b. Modulus of rigidityc. Straind. Stress

A ductile material is one that can be stretched, formed, or drawn to a significant degree before fracture. A metal that exhibits a percent elongation greater than ____ % is considered to be ductile.

a. 2 b. 3 c. 4 d. 5

A brittle material is one that fails suddenly under load with little or no plastic deformation. A metal that exhibits a percent elongation ____ 5.0% is considered to be brittle.

a. equal b. Greater than c. Less thand. It depends on the room temperature

The ratio of shearing stress to shearing strain is called:

a. Modulus of elasticityb. Modulus of rigidity c. Modulus of elongationd. Modulus of stressibility

It is the ability of a material to absorbed applied energy without failure

a. Ductility b. Brittleness c. Hardness d. Toughness

It is the indication of the resistance of a material to indentation by a penetrator.

a. Ductility b. Brittleness c. Hardness d. Toughness

It is a measure of pulling and pushing force.

a. Axial force b. Shear forcec. Torqued. Bending moments

It is the measure of the total resistance to sliding.

a. Axial forceb. Shear force c. Torqued. Bending moments

It is the measure of the resistance to twisting.

a. Axial forceb. Shear forcec. Torque d. Bending moments

A common bar suspended from certain support has axial load of 10kN. If the bar has a cross section of 20mm2, find the stress experience by the bar.

a. 350MPa b. 420MPa c. 485MPa d. 500MPa

Assume that a 25-mm diameter rivet joins the plates that are each 125 mm wide. The allowable stresses are 130 MPa for bearing in the plate material and 65 MPa for shearing of the rivet. Determine the minimum thickness of each plate.

a. 10MPa b. 20MPa c. 30MPa d. 40MPa

A cylinder pressure vessel is fabricated from plates which have a thickness of 20mm. The diameter of the pressure vessel is 450 mm and its length is 3.5m. Determine the maximum internal pressure which can be applied if the stress in the steel is limited to 150MPa.

a. 15.33MPa b. 16.67MPa c. 17.53MPa d. 18.83MPa

The wall thickness of a 3ft-diameter spherical tank is 4/17 in. Calculate the allowable internal pressure if the stress is limited to 9000 psi.

a. 155.47psi b. 169.25psi c. 176.47psi d. 188.73psi

A steel bar 40mm in diameter and 3m long is surrounded by a shell of cast iron 6mm thick. Compute the load that will compress the combined bar a total of 0.95 mm in the length of 2m. For steel E=300GPa, and for cast iron, E=150GPa

a. 151kN b. 161kN c. 171kN d. 181KN

A steel rod 3.5m long is secured between two walls. If the load on the rod is zero at 30°C, compute the stress when the temperature drops to -30°C. The cross sectional area of the rod is 1200mm2, α =11.7um/(m°C), and E=200GPa.

a. 110MPa b. 120MPa c. 130MPa d. 140MPa

A steel shaft 3ft long that has a diameter of 5in is subjected to a torque of 14kip-ft. Determine the maximum shearing stress. G=12x106 psi.

a. 0.47° b. 0.53° c. 0.68° d. 0.71°

It is the transfer of energy from the more energetic particles of substance to the adjacent less energetic ones as a result of interactions between the particles.

ci. Conduction c. Convectioncii. Radiation d. Absorption

It indicates that the rate of heat conduction in a direction is proportional to the temperature gradient in that direction

cv. Fourier’s Law of Heat Conduction cvi. Fourier’s Law of Heat Convectioncvii.Fourier’s Law of Heat Radiationcviii. Fourier’s Law of Heat

Absorption

Which of the following is considered the best conductor of heat?

cv. Gold b. Copper cvi. c. Silver d. Diamond

It is the mode of energy transfer between a solid surface and the adjacent liquid or gas that is in motion, and it involves the combined effect conduction and fluid motion.

cv. Conduction c. Convectioncvi. Radiation d. Absorption

It is the energy emitted by the matter in the form of electromagnetic waves as a result of the changes in the electronic configurations of the atom or molecules.

cv. Conduction c. Convectioncvi. Radiation d. Absorption

It states that energy can neither be destroyed nor created; it can only change forms.

e. First law of thermodynamics f. Second law of thermodynamicsg. Third law of thermodynamicsh. Zeroth law of thermodynamics

In second law of thermodynamic, which of the following state that no heat engine can have a thermal efficiency of 100% or as far as power plant to operate, the working fluid must exchange heat with the environment as well as the furnace.

a. Kelvin –Plank Statement b. Clausius-Plank Statement c. Clausius Statementd. Kelvin Statemen

In second law of thermodynamic, which of the following state that no device can transfer heat from cooler body to a warmer one without leaving an effect on the surroundings.

e. Kelvin –Plank Statement f. Clausius-Plank Statement g. Clausius Statement h. Kelvin Statement

It is defined as the amount of light output in lumens per W of electricity consumed.

e. Light intensity c. Light efficacyf. Light efficiency d. Light luminosity

Carnot cycle is composed of how many reversible processes?

a. 1 b. 2 c. 3 d. 4

Which of the following processes are involved in carnot cycle?

e. Two isothermal ; two isobaricf. One isothermal; three adiabaticg. Three isobaric; one adiabatich. Two adiabatic ; two isothermal

State that the thermal efficiencies of all reversible heat engines operating between the same two reservoirs are the same, and that no heat engine is more efficient than a reversible one operating between the same two reservoirs.

e. Throttle principlef. Otto principleg. Carnot principle h. Kelvin principle

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 40°C. Determine the thermal efficiency of this Carnot engine.

a. 93.33% b. 6.67% c. 35.85% d. 64.15%

A piston cylinder device contains a liquid-vapor mixture of water at 400K. During a constant pressure process, 700 KJ of heat is transferred to the water. As a result, part of the liquid in the cylinder vaporizes. Determine the entropy change of the water during this process.

a. 1.75kJ/K b. 280kJ-K c. 7000kJ d. 0.57K/kJ

Which of the following equation of state has two constants?

ci. Vander Waals Equation cii. Beattie-Bridgeman Equationciii. Benedict-Webb-Rubin Equationciv. Strobridge Equation

How many constant are there in Strobridge Equation of State?

a.13 b. 14 c. 15 d. 16

Which of the following equation of state has eight constant?

ci. Vander Waals Equationcii. Beattie-Bridgeman Equationciii. Benedict-Webb-Rubin Equation civ. Strobridge Equation

Consider a person standing in a breezy room at 22°C. Determine the total rate of heat transfer from this person if the exposed surface area and the average outer surface temperature of the person are 1.2 m2 and 33°C, respectively, and the convection heat transfer coefficient is 6 W/m2.ε=0.95 and σ=5.67x10-8 W/m4-K4

a. 120.5J/s b. 135.7J/s b. c. 143.2J/s d. 151.9J/s

A piston cylinder device initially contains 0.8 m3

of air at 110kPa and 80°C. The air is now compressed to 0.2 m3 in such a way that the temperature inside the cylinder remains constant. Determine the work done during this process.

a. -122kJ b. -123kJ b. c. -124kJ d. -125kJ

It is the energy possesses by the system as a result of its elevation with respect to the gravitational acceleration of the earth.

a. Potential b.Kinetic c. Momentum d.Impulse

It states that if two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other.

a. First law of thermodynamicsb. Second law of thermodynamicsc. Third law of thermodynamicsd. Zeroth law of thermodynamics

Determine the mass of the air in a room whose dimensions are (5x6x7) cm at 105 kPa and 27°C.

Heat is transferred to a heat engine from a furnace at a rate of 92MW. If the rate of waste heat rejection to a nearby river is 45MW, determine the net power output and the thermal efficiency for this heat engine.

a. 48.91% b. 51.09% b. c. 32.84% d. 67.15%

The food compartment of a refrigerator is maintained at 4°C by removing heat from it at a rate of 300 KJ/min. If the required power input to the refrigerator is 3KW, determine the coefficient of performance of the refrigerator.

a. 1.67 b. 2.33 b. c. 3.67 d. 4. 12

A 50 kg iron block at 80°C is dropped into an insulated tank that contains 0.5 m3 of liquid water at 25°C. Determine the temperature when thermal equilibrium reached. The specific heat of iron is 0.45kJ/kg-°C and for water is 4.18kJ/kg-°C.

a. 20. 7°C b. 25.6°C b. c. 30.1°C d. 35.6°C

A rigid tank contains a hot fluid that is cooled while being stirred by a paddle wheel. Initially, the internal energy of the fluid is 850kJ. During the cooling process, the fluid loses 550kJ of heat, and the paddle wheel does 200kJ of work on the fluid. Determine the final energy of the fluid. Neglect the energy stored in the paddle wheel.

a. 500kJ b. 550 kJ b. c. 600kJ d. 650 kJ

Three moles of an ideal gas are compressed slowly and isothermally from a volume of 5 to 1.5 ft3, at a temperature of 320K. How much work is done?

a. -8.12kJ b. -9.61kJ c. -10.44kJ d. -11.59kJ

A 4-in wall of fire brick, k=9 Btu/(ft2-hr-F/in), has one surface at 300F, the other at 90F. Find the heat conducted through the area of 2ft2 in 1 day.

a. 22, 680Btu b. 19, 650Btu c. 15,510Btu d. 10,730Btu

If 80 g of iron shot at 100C is dropped into 200 g of water at 20C contained in an iron vessel of mass 50 g, find the resulting temperature.

a. 20.1°C b. 21.8°C c. 22. 3°C d. 24.6°C

When a 2lb of brass at 212°F is dropped into 5lb of water at 35°F, the resulting temperature is 41.2°F. Find the specific heat of brass in Btu/lb-°F.

a. 1.120 b. 0.091 c. 0.321 d. 1.233

How much heat is necessary to raise the temperature of 0.80 kg of ethyl alcohol from 15°C of its boiling point 78.3°C?

a.10kcal b. 20kcal c. 30kcal d. 40kcal

The weight-density of air at 32F and 29.92 in Hg pressure is 0.081 lb/ft3. What is its weight-density, in lb/ft3, at an altitude where the pressure is 13.73 in Hg and the temperature is -40F?

a. 0.044 b. 0.055 c. 0.066 d. 0.77

How many zeroes in the measurement 0.00020040 are significant?a. three b. four c. six d. Seven

Which of the following describes a chemical change?

a. Water boiling to form steamb. Sugar dissolving in a cup of coffeec. Hamburger grease solidifying on a

plated. Tarnishing silver

A homogenous mixture can be separated by all of the following methods except

a. Filtration b. Chromatographyc. Crystallizationd. Distillation

Which of the following is not a pure substance?

a. Hydrogenb. Oxygenc. Waterd. Milk

A laboratory experiment was performed to determine the percent by mass of water in a hydrate. The accepted value is 36.0% water whose observed value has an error of 5.00%. Find the percent by mass of water.

a. 31.0% waterb. 36.0% waterc. 37.8% waterd. 41.0% water

36% * 1.05 =37.8%Which of the following phase changes represent sublimation?

a. Solid gas

b. Gas solid

c. Solid liquid

d. Gas liquid

The amount of energy needed to change a given mass of ice to water at constant temperature is called the heat of

a. Fusion b. Formationc. Condensationd. Crystallization

Which of the following is a binary compound?

a. Hydrochloric acid b. Oxygenc. Citric acidd. Sodium chlorate

An example of a ternary compound is

a. Potassium chlorate b. Ammoniac. Silver chlorided. Sodium bromide

What is the charge of a hydrogen atom?

a. b. c. d.

The impossibility of knowing both the precise location and velocity of subatomic particle at the same time is known as the

A . Diffraction principle b. Probability principlec. Limiting principl d. Uncertainty principle

An atom which has the greatest ability to attract electron is

a. Oxygen

b. Nitrogenc. Sulfurd. Bromine

From the reaction,

How many molecules of can be formed using 2 molecules of NO?

a. 1 b. 2 b. c. 3 d. 4

If the volume of the mole of gas molecules remains constant, lowering the temperature will make the pressure

a. Increase b. Decreasec. Increase then decreased. Decrease then increase

Whenever you have equal volumes of gases at the same temperature and pressure, the volume must

a. Contain equal number of particles b. Contain 2.4 milliliters of STPc. Contain one mole of any gas at STPd. Contain the Avogadro’s number

What pressure must be applied to 225mL of gas at 1atm to reduce its volume to 100mL?

a. 0.44atmb. 2.25atmc. 22500atmd. 1710atm

P1V1=P2V2

How many moles of are present in 44.8L of

at STP?

a. 1.2molesb. 1.4moles

c. 2.0molesd. 2.8moles

The properties of solution include all of the following except that

a. It is homogeneous mixture if it has been well stirred

b. Dissolved particles will settle out upon stirring

c. It is clear and transparent with particles too small to be seen

d. Dissolved particles will pass through a piece of filter paper

1. Suppose that energy Q is required to accelerate a car from rest to v, neglecting friction. How much added energy would be required to increase the speed from v to 2v?

a. Q b.2Q c. 3Q d.4Q

Using the energy equation W=KE2 – KE1

Q = 0.5mv2 – 0 - condition 1W = 0.5m(2v)2 – 0.5mv2 - condition 2

W=2mv2 – 0.5mv2 = 3(0.5mv2) = 3Q Suppose you want to store 1.00 J of electric potential energy in a volume of 1.00 m3 in vacuum. What is the magnitude of the required electric field?

a. 0.475 MV/m b. 0.336MV/m c. 0.225TV/m d. 0.113TV/m

1.00J/1.00m3 = 1.00J/m3

E=0.475 MV/m (a)Material a is a water and material b is a glass with index of refraction 1.52. If the incident ray makes an angle of 60o with the normal, find the direction of the reflected ray.49.3o b. 91.3o c. 60 o d. 34.7o

According to law of reflection, , hence if

then (c)

The wavelength of the red light from a helium-neon sensor is 633 nm in air but 474 nm in the aqueous humor inside our eyeballs. Calculate the speed of light in this substance.

a. 2.25 x 10 8 m/s b. 3.25 x 108 m/s c. 3.00 x 108 m/s d. 1.25 x 108 m/s

For the velocity of light in this index we have:

(

A spaceship moving away from Earth with speed of 0.900c fires a robot space probe in the same direction as its motion, with speed of 0.700c relative to the spaceship. What is the probe’s velocity relative to the Earth?a.0.900c b. 0.345c c. 0.700c d. 0.982cUsing the equation of Lorentz velocity

transformation, we have

(d)

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. b. focal divergence c. c. parallax error d. d. Snell’s effect

In fluid mechanics, this shows that the pressure of a fluid decreases as the speed of the fluid increases. In addition, the pressure of a fluid decreases as the elevation increases.a.Clairut’s equation

b. Bernoulli’s equation c. Maxwell’s equation d. Hyrdofluid equation

In electrodynamics, what term refers to the average speed of the charge carriers?

a. drag velocity b. b. molecular-kinetic speed c. c. drift speed d. d. charge velocity

In electromagnetics and wave theory, what refers to waves, commonly generated by electronic devices, whose wavelengths ranges from approximately 0.3m to 10-4 m. Due to their short wavelengths these are often used in radar systems and for studying the atomic and molecular properties of matter.a. Radio waves b. Microwaves c. AM waves d. Radar waves

The property of a substance which remains constant if no heat enters or leaves the system, while it does work or alters its volume, but which increases or diminishes should a small amount of heat enter or leave.

a. internal energy b. system c. entropy d. enthalpy

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

“If the temperature of a given quantity of gas is held constant, the volume of the gas varies inversely with the absolute pressure during a change of state”

a.General Gas Laws b. Joule’s Law c. Charles’ Law d. Boyle’s Law

An internally reversible process of a substance during which the pressure remains constant.

a.isometric b.isothermal c.adiabatic d.isobaric

The energy stored in a substance by virtue of the activity and configuration of its molecules and of the vibration of the atoms within the molecules.

a.Internal Energy b .Heat c. Enthalpy d.Entropy

“When two bodies, isolated from other environment, are in thermal equilibrium with a third body, the two are in thermal equilibrium with each other” is a statement of……..

a.1st Law of Thermodynamics c.2nd Law of Thermodynamicb. Zeroth Law d. Maxwell’s Theory of Thermal Equilbrium

Not all energy received as heat by a heat-engine cycle can be converted into mechanical work, some are also rejected” is a statement of…….

a.1st Law of Thermodynamic s b.Zeroth Lawc.2nd Law of Thermodynamics d.Law of Conservation of Energy

The combined mass of car and passengers travelling at 72 km/hr is 1500kg. Find the kinetic energy of this combined mass.

a.300kJ b.330kJ c.305kJ d. 310kJ

K=mv 2 = (1500kg)(72km/hr) 2 (1000m/km) 2 2k (2)(1kg-m/N-sec2 )(3000 sec/hr)2

= 300,000 J or 300 kJ

A mass of 5kg is 100m above a given datum where local g=9.75 m/sec2. Find the gravitational force in newton’s and the potential energy of the mass w/ respect to the datum.

a.49.25 N,4925 J b.52.05 N,5205 J c.48.75 N,4875 J d.47.85 N,4785 J

P = mg z = (5kg)(9.75m/sec2)(100m = 4875 J k (1kg-m/N-sec2)

Fg = mg = 5(9.75) = 48.75 N k 1

A pressure gage register 50 psig in a region where the barometer is 14.25 psia. Find the absolute pressure in Pa.

a.453 kPa b.434 kPa c.435 kPa d.443 kPa

P = Patm + Pg = 14.25 + 50 = 64.25 psia

P = (64.25psia)(6894.8Pa/psi) = 443 kPa

During an isentropic process of 1.36 kg/sec of air, the temperature increases from 4.44° C to 115.6°C. if Cp=1.0062kNm kg K∙for a non-flow process, what is ∆H?

a.152.2 kg/s b.152.2 J/s c.152.2 kJ/s d.152.2 Btu/s

∆H = mCp∆T = 1.36kg/s(1.0062kNm/kg K)∙(388.75-277.59K) = 152. kJ/s

This Law States that “ The quantity of the substance entering the system is equal to the substance leaving the system”

a.1st Law of Thermodynamics b.Law of Conservation of Mass

c.Newton’s 2nd Law of Motion d.Law of Conservation of Energy

“if the pressure of a given quantity of gas is held constant, the volume of the gas varies directly with the absolute temperature”

a. General Gas Law b. Boyle’s Law c. Charles’ Law d. Joule’s Law

“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

“Energy is neither created nor destroyed, but is converted from one form to another”

a. 1 st Law of Thermodynamics b. Newton’s 2nd Law of Motion c. 2nd Law of Thermodynamics d. Law of Conservation of Mass

A mammography service examined 327 patients during the third calendar quarter of 1996. 719 films were exposed during this period, eight of which were repeats. What is the repeat rate?a. 45.5% b. code 2.45% c. 1.1% d. 54.52%

A type of luminescence where the visible light is emitted only during the stimulation of the phosphor.

a. fluorescence b. phosphorescence c. after glow d. any of the above

If a heart measures 12.5 cm from side to side at its widest point, and its image on chest radiograph measures 14.7 cm, what is the magnification factor

a. 0.85 b. 1.18 c. 0.15 d. 2.2

Radiation doses in the range of approximately200 to 1000 rad produce the

a. Gastrointestinal (GI) syndromeb. Central Nervous System (CNS) syndromec. Hematologic syndromed. Prodomal syndrome

Ratio of incident to transmitted radiation through a grid ratio of patient dose with and without grid

a. Bucky factor b. Damadian factor c. Grid ratio d. Roentgen equivalent

A radiographic single-phase unit installed in a private office has a maximum capacity of 100 milliseconds of 120kVp and 500mA. What is the power rating?

a. 42 kW b. 60 kW c. 600W d. 24kW

Who completes the development of first computed tomographic (CT) scanner (EMI, Ltd.) in 1973?

a. Mistretta b. Forssmann c. Kuhl d. Hounsfield

It is the study of the response of an image receptor to x-rays

a. sensitometry b. xeroradiography c. xeroradiometry d. spectrometry

Ratio of radiographic contrast with a grid to that without a grid

a. grid ratio b. contrast improvement factor c. Collidge factor d. Bucky factor

Analysis of persons irradiated therapeutically with superficial x-rays has shown that the skin erythema dose required to affect 50% of persons so irradiated is about

a. 200 rad b. 400 rad c. 600 rad d. 800 rad

ECG recording requires a bandwidth of 0.05 to ____ Hz

a. 1000 b. 540 c. 100 d. 40

Find the potential generated if blood flowing in a vessel with radius 0.9 cm cuts a magnetic field of 250 G. Assume a volume flow rate of 175 cubic cm per second

a. 206 uV b. 309 uV c. 903 uV d. 260 uV

Period during which heart contracts.

a. Diastole b. Systole c. block mode d. Synapse

Apparatus for measuring blood pressure

a. defibrillator b. electrocardiogram c. plethysmograph d. sphygmomanometer

Given the energy level of 6.624x10^-18 J imparted to an electron stream by an X-ray device, calculate the frequency in MHz.

a. 10^6 MHz b. 45.29 MHz c. 10^10 MHz d. 300 MHz

10^10 MHz

It was first noted by Heinrich Hertz in 1887 and won Albert Einstein the Nobel Prize in 1905. It refers to the emission of electrons from a clean metallic surface (phototube) when electromagnetic radiation (light waves or X-rays) falls onto that surface.

a. Photoelectric effect b. Compton effect c. Bremsstrahlung d. Mie effect

Unit of radiation exposure or amount of X-ray radiation that will produce 2.08x10^9 ion pairs per cubic centimetre of air at standard temperature and pressure (STP).

a. Curie b. Roentgen c. Radiation absorbed dose (rad) d. Gray

An optical electronic device that measures the color concentration of a substance in solution.

a. colorimeter b. flame photometer c. spectrophotometer d. chromatograph

Recording of heart sounds

a. ultracardiography b. cardioacoustics c. electrocardiogram d.phonocardiography

Recorder for measuring galvanic skin resistance

a. electrodermograph b. electromyograph c. electrocorporealographd.electrogalvanograph