ESAS UG
What is the metal used to recover copper from a solution of copper sulphate?
Fe
Which of the following reason/s why reactions generally proceed faster at higher temperature?
I. The molecules collide more frequently
II. The activation energy is less
both I and II
What refers to ions that are NOT involved in the overall reactions?
Spectator ions
A description of the arrangement o atoms or ions in a material is called.
structure
Materials in this group are composed of one or more metallic elements such as iron, aluminum, copper, titanium, gold, and nickel.What is the group called?
metals
What is the heaviest subatomic partide?
neutron
What is the gas present in the atmosphere which filters out of the sun's ultraviolet light and provides an effective shield against radiation damage to living things?
ozone
What percent of human body is carbon?
18%
In the periodic table of elements, which one of the following is light metal
Potassium
Which of the following refers to the diffusion of a solvent into a stronger solution in an attempt to equalize the two concentrations?
Osmosis
What is the chemical formula of Sulfur Trioxide
SO3
The charge of aluminum atom in the aluminum foil is:
0
Which device could be used to determine whether a substance is radioactive?
Geiger counter
What is a substance cannot be decomposed into simpler substance during ordinary chemical reactions?
Element
How many moles there in one atom?
1.66x10^-24 moles
Formula for Aluminum Nitride
AIN
All isotopes of the same element have
Equal no. of protons
With a neutral atom?
the number of protons=the atomic number
What is the common unit used to indicate the mass of a particle?
Atomic mass unit
Which of the following is an alkaline earth metal?
Ba
What do you called the horizontal arrangement of elements of increasing atomic number in the periodic table?
period
Which of the following metallic element has a meaning "heavy stone"?
Tungsten
Which of the electrostatic forces that exist between ions?
Ionic bond
The sodium ion in sodium chloride,NaCl,has what charge?
+1
Formula for Calcium Chloride
CaCl2
Which of these elements has the highest atomic numbers?
Plutonium
The following statements are made with regard to the boiling point of a liquid.Which statement is FALSE?
At high elevations, water boils at a lower temperature because of a reduction in the surface tension of the water
How is "molality"defined?
the number of moles of solute in 1000 g of solvent
Which of the following elements and compounds is reactive in its pure form?
Sodium(Na)
A steel cannot qualify for stainless prefix until it has at least how many percent of Chromium?
10%
What prefix in steel identification means composition varies from normal limits?
X
In preparing a metallographic iron specimen, the grain boundaries are made most visible by which of the following steps?
etching the sample in a 2% solution of nitric acid in alcohol
Under very slow deformation and at high temperature, it is possible to have some plastic flow in a crystal at a shear stress lower than the critical shear stress. What is the phenomenon called?
creep
In cold working of metals
strength and hardness of steel is increased
The property of a material which allows it to be drawn into a smaller section is called
Ductility
What are considered as the building blocks for engineering materials?
Atoms
What is a combination of two or more materials that has properties that the components material do not have by themselves?
Composite
What physical property of a material that refers to the point at which a material liquefies on heating or solidifies on cooling?
Melting point
What physical property of a material that refers to the temperature at which ferromagnetic materials can no longer be magnetized by outside forces?
Curie point
What is a polymer production process that involves forming a polymer chain containing two different monomers?
Copolymerization
Which of the following is a natural magnet?
Lodestone
What is considered as the general purpose, oldest type and widely used cast iron?
Gray iron
What is a coal that has been previously burned in an axygen poor environment.
Coke
The term brass is used to designate an alloy containing
Copper and zinc
What is the most abundant metal in nature?
aluminum
Galvanized iron is a term referring to iron coated with
zinc
Which of the following treatments will result in an increase in the fatigue strength of the steel?
shot peening
What is accomplished by heating raw rubber with small amount of sulfur?
vulcanization
Which of these statements is true for twinning?
It frequency occurs in hexagonal close-packed structures
What are Van der Waals forces?
weak secondary bonds between atoms
Iron is said to be abundant in nature. About how many percent of the earth's crust is iron?
5%
Steels that are used for axles, gears, and similar parts requiring medium to high and strength are known as?
Medium-carbon steel
Polymer comes from Greek words "poly"which means"many"and"meros"which means
part
What is the principle behind fiber optics?
Reflection
The ratio of the velocity of light in vacuum to its velocity of another material is
Refractive Index
How tall does a wall mirror have to be in order for you to see all of yourself in the mirror? Imagine you stand a distance "d" from the mirror and your height is "h"and L is the length of mirror required
𝐿 = 1/2ℎ
What is the basic lens formulas?
1/Di +1/Do=1/f; So/Si=Do/Di
Which of the following statement/s about sound is/are true?
I.All sounds are produced by the vibration of bodies
II.Sound cannot travel through a vacuum
III.Sounds can be transmitted through some material
1, II and II
Objects that emit their own light are called _____ bodies.
luminated
In a mixed gas such as air, the rms speed of differentmolecules are_________.
inversely proportional to the square root of molecular mass
Whenever a body capable of oscillating is acted on by a periodic series of impulses having frequency equal to 1 of the natural frequency of oscillating of the body, the body is set into vibration with a relatively large amplitude. This phenomenon refers to
resonance
When a source of sound or a listener or both in motion relative to the air,the pitch of the sound heard by the listener is not the same as the when source and listener are at rest. This phenomenon refers to?
doppler effect
What is the meaning of an image if the image distance is negative?
The image is virtual
What are the three colors that when mixed equally together will produce white and the combination of any two will produce different colors and intensities?
Red,Blue Green
Which law states that the ratio of the sines of the angles of incidence and refraction is equal to the ratio of the speed of light in the two media?
Snell's law
What is an electronn volt?
It is a unit of energy equal to the energy possessed by an electron accelerating through a potential of one volt
What is LASER stand for?
Light Amplification by Stimulated Emission of Radiation
The mathematical expression (1 + i)^n is referred to
compound amount factor
What is the factor name for the formula(1+i)^-n?
Single payment present worth
Is the worth of property as shown in the accounting records.
Book value
It is interest earning with equal deposit made at equal interval time.
sinking fund
Is a measure of the effectiveness of an investment of a capital
Rate of return
The total income equals the total operating cost
Break-even-no-gain-no-loss
Which of the following corresponds to the meaning of annuity?
A series of uniform amounts over a period of time
What is an annuity?
a series uniform amounts over a period of time
It is the interest earned by the principal which is added to the principal will also earn an interest for the succeeding period.
compound interest
What must two investments with the same present worth and unequal lives have?
different equivalent uniform annual cash flows
What is the formula for a straight-line depreciation rate?
(100%-% net salvage value)/(estimated service life)
Which of the following is true regarding the minimum attractive rate of return used in judging proposed investments?
It is frequently a policy decision made by an organization's management
What is "work in process" classified as?
an asset
Which of the following does NOT affect owner's equity?
license to start operation
What is the acid test ratio?
the ratio of current assets (exclusive of inventory) to total current liabilities
What is the basic accounting equation?
Assets=liability +owner's equity"
The mathematical expression (1 +i) raised to n in Engineering Economics is referred to as the _____________.
compound amount factor
What do you call the ability to convert assets to cash quickly?
Liquidity
The amount of property in which a willing buyerwill pay to a willing seller for the property when neither one is under the compulsion to buy nor sell is called___________ value.
Market
What is the interest accrued over the interest period is also subject to the interest rate in the next period?
compound interest
Given a free-falling body with air resistance neglected, if the final position of the bod travelled is four times its initial position,by what factor does the velocity of the body increase?
twice
Two sky divers jump at the same time and want to play catch.Where should one aim if he wants the other to catch it?
straight because there's no air resistance
The path of projectile is
a parabola
A ball is thrown straight up into the air. Ignoreair resistance. While the ball is in the air its acceleration.
remains constant
As a projectile is thrown upward moves in its parabolic path, at what point along its path are the velocity and acceleration vectors for the projectile perpendicular to each other?
the highest point
In dynamics,uniform motion means
having uniform velocity
As the projectile rises and then falls back to the ground, its acceleration__________.
remains the same
If the acceleration of a particle is directly proportional to the force acting on it and inversely proportional to the mass of the particle, it folows the Newton's___________ law of motion.
second
The law pertaining to the collision of two objects in an isolatedsystem,the total momentum of the two objects before collision is equal to the total momentum of the two objects after collision.
conservation of momentum
When an object exerts a force on another object, the second object exerts on the first a force of the same magnitude but in opposite direction.This statement is in accordance to
Newton's Third Law of Motion
When a force is called a "normal"force,it is
a contact force perpendicular to the contact surfaces between two solid objects
Which statement about area of moment of inertia is FALSE?
The areas closest to the axis of interest contribute most to the moment of inertia
Newton's first law of motion says:
the momentum of a particle remains unchanged in the absence of unbalanced force