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Letchaysaybeejen > SURPRISE EXAM > Flashcards

SURPRISE EXAM Flashcards

1
Q

sp2 hybridization will be found for carbon in

A. CH4
B. C2H4
C. C2H2
D. CH3OH

A

B. C2H4

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2
Q

Which of the following is responsible for abnormally high boil-in point of water?

A. Covalent Bonding
B. Hydrogen Bonding
C. High Polarity
D. Large Dielectric Constant

A

Hydrogen Bonding

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3
Q

Which of the following bonds is the least polar?

A. B-Cl
B. H-I
C. C-Cl
D. C-I

A

D. C-I

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4
Q

The diene CH2=CH-CH=CH2 has double bonds that are

A. Conjugated
B. Cumulated
C. Propagated
D. Isolated

A

A.Conjugated

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5
Q

The method of preparing an ether as shown is known as CH2=CHCH2CI+NaOCH2CH=> CH2=CHCH2OCH2CH3 + NaCl

A. Williamson Reaction
B. Dehydration
C. Wurtz Reaction
D. Sodium Substitution

A

A. Williamson Reaction

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6
Q

Glycols differ from alcohols in that they

A. contain a carboxyl group
B contains more than one hydroxyl group
C. Contain a halide group
D. Participate in the Sandmeyer Reaction

A

B. contains more than one hydroxyl group

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7
Q

An ester is made by reacting

A. an amine and an alcohol
B. two different alcohols
C. An alcohol and an acid
D. An acid and a base

A

C. An alcohol and an acid

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8
Q

An example of a dipole molecule

A. CH4
B. H2
C. NaCl
D. H2O

A

D. H2O

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9
Q

Which of the following is true when the C=C and CEC bords are compared?

A. The triple bond is shorter than the double bond
B. The double bond vibrates at a lower frequency than the triple bond
C. The double bond energy is lower than the triple bond energy
D. Both are composed of sigma and pi bonds
E. All of the above are true

A

E. All of the above are true

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10
Q

Describe the geometry of CH2Cl2, dichloromethane?

A. linear, polar
B. tetarahedral, nonpolar
C. Tetrahedral, polar
D. Linear, nonpolar

A

C. Tetrahedral, polar

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11
Q

Which one of the following statements is correct?

A. All essential amino acids are glycogenic
B. Ornithine and citruline are found in tissue proteins
C. Cysteine is an essential amino acid in individuals consuming a diet devoid of methionine
D. In the presence of adequate dietary sources of tyrosine, phenylamine is not an essential amino

A

C. Cysteine is an essential amino acid in individuals consuming a diet devoid of methionine

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12
Q

To find the angles of a triangle, given only the lengths of the sides, one would use

A. The law of cosines
B. the law of sines
C. the law of tangents
D. the inverse-square lav

A

A. The law of cosines

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13
Q
  1. For turbulent flow of a fluid in a pipe, all of the following are true exccpt:

A. The average velocity will be nearly the same as at the pipe center.
B. The energy lost to turbulence and friction varies with kinetic energy.
C. Pipe roughness affects the friction factor.
D. The Reynolds number will be less than 2300.

A

D. The Reynolds number will be less than 2300.

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14
Q

The ideal Otto cycle consists of which of the following processes?

A. two constant-volume and two isentropic process
B. Two constant-pressure and two isentropic process
C. two constant-volume and two isothermal process
D. two constant-pressure and two isothermal process

A

A. two constant-volume and two isentropic process

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15
Q

What is the origin of the energy conservation equation. Used in flow system?

A. Newton’s first law of motion
B. Newton’s second law of motion
C. The first law of thermodynamics
D. The second law of thermodynamics

A

C. The first law of thermodynamics

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16
Q

Which of the following is the basis for Bernoulli’s law for fluid flow?

A. The principle of conservation of mass
B. The principle of conservation of energy
C. The continuity equation
D. Fourier’s law

A

B. The principle of conservation of energy

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17
Q

A membrane separation process where three component from a liquid phase which is heated, permeates through the membrane and is removed unde low pressure

A. Revere osmossis
B. Dialysis
C. Pervaporation
D. Micro-filtration

A

C. Pervaporation

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18
Q

Which of the followwing is unit of luminous intensity?

A. Candela
B. Weber
C. Tesla
D. Becquerel

A

A. Candela

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19
Q

Which of the following is the unit of a magnetic flux?

A. Gray
B. Weber
C. Lumen
D. Lux

A

B. Weber

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20
Q

The prefix equivalent to 10^-15 is?

A. Nano
B. Pico
C. Femto
D. Atto

A

C. Femto

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21
Q

The absolute viscosity of a fluid varies with pressure and temperature and is defined as a function of

A. Density and angular deformation rate
B. Density and shear stress
C. Density and shear stress and angular deformation rate
D. Shear stress and angular deformation rate

A

D. Shear stress and angular deformation rate

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22
Q

Choose the correct statement about family of elements in the periodic table

A. The atoms of all elements in a family have the same number of shells of electrons.
B. All elements in a family have the same physical state
C. All elements in a family have the same chemical reactivity
D. The atoms of all elements in family have the same number of valence electrons.

A

D. The atoms of all elements in family have the same number of valence electrons.

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23
Q

It is a general method of process control that is especially well suited for difficult, multiinput, multioutput (MIMO) control problems where there are significant interactions between the manipulated inputs and the controlled outputs.

A. adaptive control
B. cascade control
C. fuzzy logic control
D. model predictive control

A

D. model predictive control

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24
Q

A process control method which is routinely used in most modern computer control system.

A. adaptive control
B. cascade control
C. fuzzy logic control
D. model predictive control

A

B. cascade control

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25
Q

In substances that sublime, the intermolecular forces of attraction are

A. weak and the vapor pressure is low
B. weak and the vapor pressure is high
C. Strong and thee vapor pressure is low
D. Strong and the vapor pressure is high

A

B. weak and the vapor pressure is high

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26
Q

Very fine precipites are most easily separated by

A. distillation
B. Filtration
C. Centrifugation
D. Evaporation

A

C. Centrifugation

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27
Q

Very fine suspended and colloidal impurities in water are removed by a process called

A. Softening
B. Disinfection
C. Coagulation
D. plain sedimentation

A

C. Coagulation

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28
Q

The colored gas most associated with smog is

A. an oxide of nitrogen
B. An oxide of sulfur
C. An oxide of hydrogen
D. A chloride of slfur
E. A nitride of nitrogen

A

A. an oxide of nitrogen

29
Q

A protein is

A. A polysaccharide
B. Deoxyribonucleic acid
C. A polymer of amino acids
D. Soluble because of the carbonyl groups

A

C. A polymer of amino acids

30
Q
  1. The bonding in the benzene molecule, C6H6, in any of its resonance structures, contains

A. 6 sigma bonds and 6 pi bonds
B. 12 sigma bonds and 6 pi bonds
C. 12 sigma bonds and 3 pi bonds
D. 6 sigma bonds and 12 pi bonds
E. Only sigma bonds

A

C. 12 sigma bonds and 3 pi bonds

31
Q

Which of the following is most likely to form hydrogen bonds?

A. an alkyne
B. an alcohol
C. an aldehyde
D. a ketone
E. an ether

A

B. An alcohol

32
Q

The following compounds have the same number of carbon atoms. Which is expected to have the lowest boiling point?

A. an alkyne
B. an alcohol
C. an aldehyde
D. ketone
E. an ether

A

A. an alkyne

33
Q

Which of the following always have a constant percentage of carbon in all of their compounds? (Assume that there are no other functional groups on the molecule)

A. alkenes
B. alcohols
C. Aldehydes
D. Ketones
E. esters

A

A. alkenes

34
Q

CH2O is the empirical formula for

A. amino acids
B. proteins
C. Carbohydrates
D. aldehydes
E. DNA and RNA

A

C. Carbohydrates

35
Q

Modern automobiles use a catalytic converter to

A. increase horsepower by burning more gasoline
B. complete the combustion of unburned gases
C. convert pollutants into water
D. Absorb pollutantss from the exhaust
E. Cool the exhaust gases

A

B. complete the combustion of unburned gases

36
Q

A fluid is flowing on a surface, which contains a component that leaches out to the fluid. Assuming that all the 3 regions of mass transfer are present, in which of these regions is diffusion controlling?

A. Knudsen region
B. buffer region
C. turbulent region
D. viscous sublayer

A

D. viscous sublayer

37
Q

In unsteady state mass transfer, the quantity DABt/rm2 is referred to as

A. unaccomplished change
B. relative resistance
C. Relative time
D. Relative position

A

C. Relative time

38
Q

If Kx>Ky, then the controlling phase is

A. the liquid phase
B. the gas phase
C. The interface
D. In either film

A

A. the liquid phase

39
Q

In two-phase mass transfer, equilibrium may exist

A. at the interface
B. in the gas phas
C. in the liquid phase
D. in either film

A

A. at the interface

40
Q

Which is not true at the interphase cf a gas scrubbing operation?

A. the solute concentration of the gas is less than that of the bulk
B. the solute concentration of the liquid is less than that of the bulk
C. the solute concentration of the liquid and gas phase are equal
D. the solute concentration of the gas is greater than the liquid

A

A. the solute concentration of the gas is less than that of the bulk

41
Q

In extraction, as the temperature increases, the area of homogeneity (area covered by bimodal curve)

A. decreases
B. increases
C. Remains the same

A

A. decreases

42
Q

The suitable evaporator for concentration of foaming

A. long tube evaporator
B. vacuum evaporator
C. short tube evaporator
D. falling film evaporator

A

A. long tube evaporator

43
Q
  1. Macroscopic transfer of mass between moving fluid and surface which is of different concentration is called

A. molecular diffusion
B. convective mass transfer
C. Unsteady stat diffusion
D. All of these

A

B. convective mass transfer

44
Q

For packed column the main purpose of packing is to

A. strengthen the column
B. increase the pressure drop in the tower
C. increase the surface area
D. reduce the flow rate across the column

A

C. increase the surface area

45
Q

In a gas absorption operation, when the operating line crosses the equilibrium curve

A. the NTU zero
B. the gas flow rate is maximum
C. the liquid flow rate is maximum
D. the number of stages is infinite

A

D. the number of stages is infinite

46
Q

The overhead product composition decreases with time in

A. batch distillation with reflux
B. continuous distillation without reflux
C. continuous distillation with reflux
D. distillation operating at total reflux

A

A. batch distillation with reflux

47
Q

For a binary mixture with low relativity, continuous rectification to get pure products will require

A. low reflux ratio
B. Less number trays
C. small cross section
D. High reflux ratio

A

D. High reflux ratio

48
Q

Chemisorption is

A. the same as van der Waals
B. An irreversible phenomenon
C. characterized by adsorption of heat
D. always in equilibrium

A

B. An irreversible phenomenon

49
Q

The current through a metal conductor is proportional to the potential difference between its ends.

A. Coulomb’s law
B. Lens’s law
C. Faraday’s law
D. Ohm’s law

A

D. Ohm’s law

50
Q

An electrically neutral object has

A. No charge at all
B. Equal amount of negative and positive charge
C. been stripped of all electrons
D. Been stripped of all protons

A

B. Equal amount of negative and positive charge

51
Q

The second is the duration of radiation of what radioactive element?

A. Magnesium
B. Krypton
C. Cesium
D. Platinum

A

C. Cesium

52
Q

The sum of the currents that enter a junction equals the sum of the currents that leave the junction.

A. Coulomb’s law
B. Faraday’s law
C. Kirchhoff’s Rule
D. Gaussian theory

A

C. Kirchhoff’s Rule

53
Q

The energy content of a charged capacitor resides in its

A. Plates
B. Potential difference
C. Charge
D. Electric fieldd

A

D. Electric fieldd

54
Q

The electron volt is a unit of

A. Charge
B. Potencial difference
C. Energy
D. Momentum

A

C. Energy

55
Q

The product of force and the time during which it acts is known as:

A. Momentum
B. Velocity
C. Power
D. Impulse

A

D. Impulse

56
Q

An upward force (bouyant force) is equal to the weight of the fluid that is being displaced. This principle lies on:

A. Dalton
B. Bernoulli
C. Archimedes
D. Pappus

A

C. Archimedes

57
Q

Sound waves does not travel in

A. Air
B. Material medium
C. Vacuum
D. Water

A

C. Vacuum

58
Q

The time rate of change of velocity

A. Speed
B. Motion
C. Acceleration
D. Power

A

C. Acceleration

59
Q

On a distance-time graph, a horizontal line corresponds to motion at

A. Zero speed
B. Increasing speed
C. Constant speed
D. Decreasing speed

A

C. Zero speed

60
Q

On a distance-time graph, a straight line sloping upward to the right corresponds to motion at

A. Zero speed
B. Increasing speed
C. Constant speed
D. Decreasing speed

A

C. Constant speed

61
Q

As an airplane climbs

A. Its mass increases
B. Its mass decreases
C. Its weight increases
D. Its weight decreases

A

D. Its weight decreases

62
Q

When a horse pulls a wagon, the force that causes the horse to move forward is the force

A. he exerts on the wagon
B. the wagon exerts on him
C. he exerts on the ground
D. the ground exerts on him

A

D. the ground exerts on him

63
Q

The action and reaction forces referred to in Newton’s third law of motion

A. Act on the same object
B. Act on different object
C. Need not be equal in magnitude and need not have the same line of action
D. Must be equal in magnitude but need not have the same line in action

A

B. Act on different object

64
Q

When an object exerts a normal force on a surface, the force is

A. Equal to the objects weight
B. Frictional in origin
C. Parallel to the surface
D. Perpendicular the surface

A

D. Perpendicular the surface

65
Q

To set an object in motion on a surface usually requires

A. less force than to keep it in motion
B. the same force as that needed to keep it in motion
C. More force than to keep it in motion
D. Only as much force as needed to overcome inertia

A

C. More force than to keep it in motion

66
Q

The frictional force between two surfaces in contact does not depend on

A. the normal force pressing one against the other
B. The areas of the surfaces
C. If the surfaces are stationary or in relative motion
D. Whether or not a lubricant is used

A

B. The areas of the surfaces

67
Q

Which of the following is not a unit of power?

A. Joule-second
B. Watt
C. Newton-meter per sec
D. Horsepower

A

A. Joule-second

68
Q

An object at rest may have

A. velocity
B. momentum
C. Kinetic Energy
D. Potential energy

A

D. Potential energy

69
Q

An object in motion need not have

A. velocity
B. momentum
C. Kinetic energy
D. Potential energy

A

D. Potential energy

Letchaysaybeejen (10 decks)

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