WorksheetsQuiz Thermodynamics: First Law
Total questions: 35
Worksheet time: 19mins
the amount of energy required to change the temperature of an object
the total amount of energy an object can store
the thermal potential energy of the object
the amount of work done by the object
25 °C in kelvins
298.45 K
248.15 K
298.15 K
Calculate the volumetric flow of a system feed by water with a mass flow of 3 kg/s.
3000 kg/s
0.003 kg/s
3003 kg/s
Calculate the heat transfer to the environment if the system produce a work of 45 kJ and receive 9 kJ in the way of heat. The enthalpy difference of the system is equal to 55 kJ.
1
91
19
A 7.50 liter sealed jar at 18 °C contains 0.125 moles of oxygen and 0.125 moles of nitrogen gas. What is the pressure in the container?
7.38 atm
0.796 atm
0.684 atm
0.398 atm
What does R stand for
Ideal gas constant
Real gas constant
Temperature constant
Ideal gas law
Which of the following equations represents the Ideal Gas Law?
1200 J of heat are added to a sample of gas while 400 J of work is done by the gas. What is the change in internal energy of the gas?
800 J
1600 J
-800 J
-1600 J
500 J of energy is applied to a gas, if 200J of work is done by the gas. What is the change of internal energy in calories?
300cal
71.7cal
700cal
167.4cal
The internal energy of a system decreases by 40cal. What work is done by the gas, if the system absorbs 150J of heat?
317.2J
17.2J
190J
110J
The internal energy of a system increases by 50cal while 350J of work is done by a gas. Determine the change in heat .
559J
400J
141J
300J
if 600J of heat is needed to increase the internal energy from 15cal to 45cal. What work will the system produce?
474.6J
570J
535.4J
630J
40J of work is done by a gas when the system has an increase in internal energy of 125J. What energy is needed to do so?
165J
85J
Can´t be possible
165Cal
An ideal gas undergoes the thermodynamic changes represented in the P –V diagram below
(P → Q → R → P).
Which of the following is the net work done by the gas in a cycle?
4.5 × 105 J
3.0 × 105 J
1.0 × 105 J
Zero
The diagram shows the pressure-volume relationship for a fixed mass of an ideal gas that undergoes a cycle XYZ.
In which part(s) of the cycle is external work done on the gas?
Y → Z only
Y → Z and Z → X only
X → Y and Z → X only
X → Y only
The diagram shows the pressure–volume (PV) relationship for a gas.
Which of the following area(s) is/are equal to the work done by the gas as it expands?
area I
area II
area I + area II
area I – area II
In the formula of The First Law of Thermodynamics, the ''Q'' represent:
Change in internal energy
Energy transferred as heat
Work done on or by the system
In the formula of The First Law of Thermodynamics, the ''W'' represent:
Work done on or by the system
Change in internal energy
Energy transferred as heat
No work is done on or by the system
Isothermal
Adiabatic
Isovolumetric
Isolated System
Internal energy is used exclusively for work.
Isovolumetric
Adiabatic
Isothermal
Isolated System
Heat transferred is completely used for work.
Isothermal
Isovolumetric
Adiabatic
Isolated system
No change in internal energy.
Isovolumetric
Isothermal
Adiabatic
Isolated System
The SI unit of heat and energy is the __________.
BTU
calorie
watt
joule
What is the formula to calculate heat energy required to raise the temperature of any substance?
m = Q.c.p
Q = ½ m. v
Q = m.c.ΔT
m = n.M
What does "ΔT" mean?
A change in temperature
A change in heat
Time
A change in height
For the formula:
Q= m.c.∆T
The units for specific heat are:
kJ/g
J/g°C
J/K
°C
If the specific heat of water is 4,186 J/kg∙°C, how much heat is required to increase the temperature of 1.2 kg of water from 23 °C to 39 °C?
80,3712 J
- 49,478 J
80,3712 K
123,645 °C
What does m stand for in the equation for specific heat capacity?
Melting point
Miss Grand International
Mass
Measurement
Internal energy is the...
sum of the random distribution of heat and potential energies of the molecules of the system
sum of the kinetic and potential energies of the molecules of an object
sum of the kinetic and potential energies of an object
sum of the random distribution of kinetic and potential energies of the molecules of the system
The heat absorbed by melting a solid is known as
latent heat of solid
latent heat of fusion
latent heat of liquid
latent heat of vaporisation
latent heat of gas
What happens to the temperature of a substance during a phase change?
Increases
Remains constant
Decreases
Increases or Decreases
