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WorksheetsChemical
Total questions: 130
Worksheet time: 2hrs 38mins
Which of the following are ways in which energy can be transferred to or from a substance?
a. heat and internal energy
b. work and internal energy
c. heat and work
d. heat and kinetic energy
What is a set of particles or interacting components that is considered a distinct physical entity called?
a. an engine
b. a system
c. an environment
d. an ideal gas
How much work is done by 0.020 m3 of gas if its pressure increases by 2.0 x105 Pa and the volume remains constant?
a. 0 J
b. -4.0 x 103 J
c. 4.0 x103 J
d. 1.0 x107 J
Pressure equal to 2.5 x105 Pa is applied to a gas, causing its volume to change by -2.0x10-3 m3. How much work is done?
a. 0 J
b. -5.0x107 J
c. -450 J
d. -500
For an isovolumetric process, which of the following statements is correct?
a. Work, heat, and internal energy all undergo changes.
b. Work and heat balance each other, so that there is no change in internal energy.
c. No energy is transferred as heat; internal energy change is due to work.
d. No work is done; internal energy change is due to heat.
For an isothermal process, which of the following statements is correct?
a. Work, heat, and internal energy all undergo changes.
d. No work is done; internal energy change is due to heat.
c. Work and heat balance each other, so that there is no change in internal energy.
d. No energy is transferred as heat; internal energy change is due to work.
For an adiabatic process, which of the following statements is correct?
a. Work, heat, and internal energy all undergo changes.
b. Work and heat balance each other, so that there is no change in internal energy.
c. No energy is transferred as heat; internal energy change is due to work.
d. No work is done; internal energy change is due to heat.
Gas within a piston is compressed from a volume of
1.35x10-2 m3 to a volume of 12.5x10-3 m3. What quantity of work is done if the compression occurs under a constant pressure of 4.0x105 Pa?
200 J
-200 J
400 J
-400 J
A gas is enclosed in a container fitted with a piston. The applied pressure is maintained at 599.5 kPa as the piston moves inward,which changes the volume of the gas from 5.317 × 10^−4 m3 to 2.523 × 10^−4 m3. How much work is done?
162.5 J
-165.7 J
-167.5 J
0J
A gas is enclosed in a container fitted with a piston. The applied pressure is maintained at 599.5 kPa as the piston moves inward,which changes the volume of the gas from 5.317 × 10^−4 m3 to 2.523 × 10^−4 m3. The work is done?
on the gas
by the gas
No work is done
inward the piston
During phase change ____________________ does not change.
pressure
temperature
work
volume
Potential and Kinetic energy is also known as _________________.
geothermal energy
kinesthetic
mechanical energy
thermal energy
Symbol that indicates that energy is released.
U
Q
-Q
W
Specific heat capacity for water is ___________.
129 J/jkg * C
4186 J/jkg * C
138 J/jkg * C
1487J/jkg * C
The reverse of heat vaporization is ___________________.
condensation
evaporation
melting
freezing
Rapidly inflating of balloon under a pumping machine.
adiabatic
isovolumetric
isochoric
Isothermal
During systole stage ventricles of heart contracts.
a. adiabatic
b. isothermal
c. isovolumetric
d. isobaric
A 0.10 kg ball falls 10.m onto a hard floor and then bounces back up to 9.0m. How much of its transformed to the internal energy of the ball and the floor?
0.78 J
0.98 J
0.89 J
0J
The first law of thermodynamics is a restatement of the
Zeroth law of thermodynamics
law of heat addition
principle of entropy
conservation of energy
Which best describes ENTROPY?
Useful heat energy needed to drive an engine
Heat that can be stored to be used at a later date
Degree of disorder of a state
A state of order in a physical system
Which statement is true about the ENTROPY?
Entropy refers to disorder, the unusable portion that escapes from a system
Entropy refers to the balance of temperature among two or more systems
Entropy refers to the average kinetic energy of the molecules
Entropy refers to the inability to destroy or create energy
True or False? The First Law of Thermodynamics states that the total energy output is equal to the total amount of energy supplied.
True
False
A system is in thermodynamic equilibrium
if temperature and pressure at all points are same
if temperature and pressure at all points are not same
if temperature at all points are same
if pressure at all points are same
Which of the following is an intensive property of a thermodynamic system ?
Volume
Temperature
Mass
Energy
In an open thermodynamic system,
heat can be transferred
work can be done
mass can be transferred
all of the above
none of the above
When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called
Zeroth law of thermodynamics
First law of thermodynamics
Second law of thermodynamics
Kelvin Planck’s law
The value of one bar (in SI units) is equal to
100 N/m2
1000 N/m2
1 × 104 N/m2
1 × 105 N/m2
1 × 106 N/m2
As a system becomes more disordered, entropy
remains the same
increases
decreases
cannot be determined
One litre of water occupies a volume of
100 cm3
250 cm3
500 cm3
1000 cm3
The value of bulk modulus of a fluid is required to determine
Reynold's number
Froude's number
Mach number
Euler's number
In one dimensional flow, the flow
is steady and uniform
takes place in straight line
takes place in curve
takes place in one direction
The kinematic viscosity is the
ratio of absolute viscosity to the density of the liquid
ratio of density of the liquid to the absolute viscosity
product of absolute viscosity and density of the liquid
product of absolute viscosity and mass of the liquid
The pressure less than atmospheric pressure is known as
suction pressure
vacuum pressure
negative gauge pressure
all of these
The total energy line lies over the hydraulic gradient line by an amount equal to the
pressure head
velocity head
pressure head + velocity head
pressure head - velocity head
If a body floating in a liquid returns back to its original position, when given a small angular displacement, the body is said to be in
neutral equilibrium
stable equilibrium
unstable equilibrium
none of these
The power transmitted through a pipe is (where w = Specific weight in N/m3, and Q = Discharge in m3/s)
w x Q x H
w x Q x hf
w x Q (H - hf)
w x Q (H + hf)
According to Archimede's principle, if a body is immersed partially or fully in a fluid then the buoyancy force is _______ the weight of fluid displaced by the body.
equal to
less than
more than
unpredictable
The component of the total force exerted by fluid on a body in the direction parallel to the direction of motion is called as
lift
drag
both a. and b.
none of the above
The fluid will rise in capillary when the capillary is placed in fluid, if
the adhesion force between molecules of fluid and tube is less than the cohesion between liquid molecules
the adhesion force between molecules of fluid and tube is more than the cohesion between liquid molecules
the adhesion force between molecules of fluid and tube is equal to the cohesion between liquid molecules
None of the above
What is an ideal fluid?
A fluid which has no viscosity
A fluid which is incompressible
A fluid which has no surface tension
All of the above
The hydraulic mean depth or the hydraulic radius is the ratio of
area of flow and wetted perimeter
wetted perimeter and diameter of pipe
velocity of flow and area of flow
none of these
When a body is placed over a liquid, it will float if
gravitational force is equal to the upthrust of the liquid
gravitational force is less than the upthrust of the liquid
gravitational force is more than the upthrust of the liquid
none of the above
The discharge through a channel of trapezoidal section is maximum when
width of channel at the top is equal to twice the width at the bottom
depth of channel is equal to the width at the bottom
the sloping side is equal to half the width at the top
the sloping side is equal to the width at the bottom
The tangential velocity of the water element having a free vortex is
directly proportional to its distance from the centre
inversely proportional to its distance from the centre
directly proportional to its (distance)2 from the centre
inversely proportional to its (distance)2 from the centre
A venturiflume is used to measure
pressure of liquid
discharge of liquid
pressure difference between two points in a channel
pressure difference between two points in a pipe
The metacentric height is the distance between the
centre of gravity of the floating body and the centre of buoyancy
centre of gravity of the floating body and the metacentre
metacentre and centre of buoyancy
original centre of buoyancy and new centre of buoyancy
The coefficient of discharge for an external mouthpiece depends upon
velocity of liquid
pressure of liquid
area of mouthpiece
length of mouthpiece
Select the wrong statement
An equivalent pipe is treated as an ordinary pipe for all calculations
The length of an equivalent pipe is equal to that of a compound pipe
The discharge through an equivalent pipe is equal to that of a compound pipe
The diameter of an equivalent pipe is equal to that of a compound pipe
A system which exchanges both matter and energy is called --- system
(a)
Temperature is ----- property
Intensive property
Extensive property
In an isothermal process
Delta U=0
Q=0
T=0
none of these
Mathematical equation of first law of thermodynamics is
Here U means delta U
U=q+W
q=U+W
W=U+q
None of these
Enthalpy H =
U-PV
U+PV
PV
PV-U
Delta S >0 then reaction
Non spontaneous
Spontaneous
At equilibrium
None of these
Which of the following is true for a closed system?
mass entering = mass leaving
mass does not enter or leave the system
mass entering can be more or less than the mass leaving
none of the mentioned
Thermodynamics is not concerned about
Energy changes involved in a chemical reaction.
The extent to which a chemical reaction proceeds
The rate at which a reaction proceeds.
The feasibility of a chemical reaction.
Which of the following statements is correct?
The presence of reacting species in a covered beaker is an example of open system.
There is an exchange of energy as well as matter between the system and the surroundings in a closed system.
The presence of reactants in a closed vessel made up of copper is an example of a closed system.
The presence of reactants in a thermos flask or any other closed insulated vessel is an example of a closed system.
The state of a gas can be described by quoting the relationship between
pressure, volume, temperature
temperature, amount, pressure
amount, volume, temperature
pressure, volume, temperature, amount
Which of the following variables controls the physical properties of a perfect gas
pressure
temperature
volume
all of the above
Intensive property of a system is one whose value
depends on the mass of the system, like volume
does not depend on the mass of the system, like temperature, pressure, etc.
is not dependent on the path followed but on the state
is dependent on the path followed and not on the state
Work done in a free expansion process is
+ ve
-ve
zero
maximum
An isolated system is one in which
mass does not cross boundaries of the system, though energy may do so
neither mass nor energy crosses the boundaries of the system
both energy and mass cross the boundaries of the system
mass crosses the boundary but not the energy
In a free expansion process
(a) work done is zero
(b) heat transfer is zero
(c) both (a) and (b) above
(d) work done is zero but heat increases
First law of thermodynamics furnishes the relationship between
heat and work
heat, work and properties of the system
heat and internal energy.
various properties of the system
Standard enthalpy change of combustion is defined as the enthalpy change when
1 mole of compound is burnt in oxygen.
1 mole of compound is completely burnt in oxygen under standard conditions of 298K and 1 bar.
1 mole of compound is burnt under oxygen at 293K and 1 bar.
1 mole of oxygen is used to burn a compound under standard conditions of 298K and 1 bar.
Two objects with different temperatures are placed into a system. Which way will heat flow naturally?
From the warmer object to the cooler object.
From the cooler object to the warmer object.
From one object to the other regardless of temperature.
No flow will occur.
What must occur for the natural flow of heat to be reversed?
Work
Kinetic Energy
Temperature Conversion
Create energy
What is specific heat at constant pressure, Cp?
The energy required to raise the temperature of the unit mass of a substance by one degree as the pressure is maintained constant.
The energy required to decrease the temperature of the unit mass of a substance by one degree as the pressure change.
The energy required to decrease the temperature of the unit mass of a substance by one degree as the pressure is maintained constant.
The energy required to raise the temperature of the unit mass of a substance by one degree as the pressure is change.
Using the stress-strain curve above, what is the yield strength for aluminum?
≈ 130 Mpa
≈ 250 Mpa
≈ 230 Mpa
≈ 200 Mpa
Using the stress-strain curve above, what is the tensile strength for steel?
≈ 350 Mpa
≈ 250 Mpa
≈ 230 Mpa
≈ 200 Mpa
What does point A, B, D, E represent, respectively?
A: Yield Strength, B: Modulus of Elasticity, D: Tensile Strength, E: Strength at Failure
A: Modulus of Elasticity, B: Yield Strength, D: Tensile Strength, E: Strength at Failure
A: Modulus of Elasticity, B: Yield Strength , D: Tensile Strength, E: Strength at Failure
A: Yield Strength, B: Modulus of Elasticity, D: Strength at Failure, E: Tensile Strength
Which of the following are items that do not affect the tensile strength of a member?
cross-sectional area
length
material
shape
density
Using the stress-strain curves provided, which of the two materials experiences more plastic deformation?
Material #1
Material #2
Using the stress-strain curves provided above, which of the two materials shown is more brittle?
Material #1
Material #2
These materials can be easily shaped, stretched, and are sometimes elastic.
metals
polymers
ceramics/glass
composites
Material can conduct heat and electricity, can be hammered into a shape, or drawn into a wire.
metals
polymers
ceramics
glass
A force is defined as a
push
pull
stretch
push & pull
A material’s ability to resist denting or scratching is called:
toughness
hardness
tension
torsion
You push your finger into a ball of play-doh and it keeps its new shape. This is an example of
elasticity
plasticity
hardness
tensile strength
Toughness is the ability to absorb energy and:
twist
resist fracture or breaking
bend
dent
Rusting is an example of a(n)
chemical property
physical property
toughness
amorphous property
Name the following mechanical property
shear
torsional
compressional
tensional
Name the following mechanical property
Shear
compressional
torsional
tensional
According to the stress-strain curve below, which of the following materials are the strongest?
metal
ceramic/glass
polymer
composite
What is Ferrous metal
Material that has good electrical resistance
Metal that consists of Chromium
Metal that has non magnetic properties
Metal that has iron as a base metal
Which metal is commonly used for Car bodies and girders?
Tin
Mild steel
high Carbon steel
Stainless steel
Which metal is commonly used for Machine tools, vices and engine blocks
Cast iron
Mild steel
high Carbon steel
Stainless steel
The main component of glass is ...
silium
silica
sodium
boride
What type of glass does the image show?
Tempered
Laminated
Toughened or Tempered glass does what when it breaks?
Breaks into sharp shards
Forms a shatter but is kept held together
Breaks into small, unsharp pieces
Doesn't really break at all
Identify the metal forming process shown in the image
Shell Casting
Hot Rolling
Extrusion
Lost Wax Casting
Which of the following stress–strain curves is typical of glass under tensile load?
Which metal is commonly used for Cutlery, kitchen sinks, door handles?
Tin
Lead
Aluminium
Stainless steel
Which metal is commonly used for Coating steel food cans, solder?
Tin
Lead
Aluminium
Copper
Which metal is commonly used for Roof flashing, batteries, radiation shielding?
Brass
Lead
Aluminium
Copper
Which metal is commonly used for Alloyed with other materials to make bike frames, aeroplane parts?
Brass
Bronze
Aluminium
Copper
Which metal is commonly used for Electrical wires, heating pipes and pots?
Brass
Bronze
zinc
Copper
What is the correct formula for the rate of heat transfer (q) through a plane wall of thickness L and surface are A, when temperature difference between two surfaces is ΔT ? The thermal conductivity is k.
q = (k A ΔT) / L
q = k A L ΔT
q = (ΔT) / (k A l)
none of the above
Thermal conductivity of the same material varies with
a. the thickness of the material
b. the temperature of the material
C. both a. and b.
d. thermal conductivity of the same martial does not vary at all
What does a composite wall mean?
two walls of different materials are connected in series without any gap between them
three walls of different materials are connected in series without any gap between them
more than three walls of different materials are connected in series without any gap between them
all of the above
When a composite wall of three layers in series having thermal resistances R1, R2 and R3 respectively. The heat transfer takes place normal to the surface of the layers. How is the total thermal resistance of the composite system calculated?
1 / (R1 + R2 + R3)
((1 / R1) + (1 / R2) + (1 / R3) )
(R1 + R2 + R3)
none of the above
What is the formula for the thermal resistance (R) of a hollow cylinder of internal radius Ri, outer radius Ro and the length l ? Thermal conductivity of the cylinder material is k. The heat flows from inner side to outer side.
R = ln (Ro / Ri) / 2πkl
R = ln (Ri / Ro) / 2πkl
R = (Ro + Ri) / 2πkl
R = (RoRi) / 2πkl
At the critical radius of insulation of a hollow sphere, the heat transfer will be
minimum
maximum
does not change
unpredictable
The critical radius of a hollow sphere having thermal conductivity k and ho as convective heat transfer coefficient of outer fluid is given by
ho / k
k / ho
2k / ho
ho / 2k
A hollow sphere of internal diameter ID = 20 cm and outer diameter OD = 30 cm contains hot fluid. What should be the critical radius of insulation for maximum rate of heat transfer? Thermal conductivity k = 0.86 W/mK and convection heat transfer coefficient of outer fluid ho = 20 W/m2K.
0.086 cm
0.86 m
8.6 mm
8.6 cm
Heat transfer from higher temperature to low temperature takes place according to
Fourier law
First law of thermodynamics
Zeroth law of thermodynamics
Second law of thermodynamics
For a given volume and specified heat input which material will have the smallest temperature rise _____.
water
mild steel
aluminum
copper
In which of the following cases most unsteady heat flow occurs?
Through the walls of a furnace
Through lagged pipes carrying steam
Through the wall of a refrigerator
During annealing of castings
A composite plane wall is made of two different materials of same thickness with thermal conductivities k1 and k2 respectively. The equivalent thermal conductivity of the slab is _____.
k1 + k2
k1.k2
(2k1.k2)/(k1+k2)
None of these
Thermal conductivity of non metals ___________ with rise in temperature
decreases
increases
remains same
unpredictable
The SI unit of heat transfer coefficient is
W/mK
W/m2 K
W/hmK
WIh2 m2 K
In transient heat conduction, the two significant dimensionless parameters are number and number.
Fourier, Reynolds
Reynolds, Prandtl
Biot, Fourier
Reynolds, Biot
