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# Multiple choice question for engineering

## Set 1

1. The number of degrees of freedom is the number of variables in a set of independent equations to which values must be assigned so that the equations can be solved.
The above given statement is
a) True
b) False
c) Can`t say
d) None of the mentioned

Answer: a [Reason:] The number of degrees of freedom is the number of variables in a set of independent equations to which values must be assigned so that the equations can be solved.

2-3. For degrees of freedom (Nd) expression, Nd = Nv – Ne
2. Nv represents
a) Number of variables
b) Number of equations
c) Number of free variables
d) None of the mentioned

Answer: a [Reason:] Nv is the number of the variables.

3. Ne represents
a) Number of variables
b) Number of equations
c) Number of free variables
d) None of the mentioned

Answer: b [Reason:] Ne is the number of the equations.

4. ______________variables are included in the analysis in contrast with the degrees of freedom.
a) Intensive
b) Extensive
c) Both Extensive and Intensive
d) None of the mentioned

Answer: c [Reason:] Intensive variables are included in the analysis in contrast with the degrees of freedom.

5. Gibbs phase rule for general system is
a) P+F=C-1
b) P+F=C+1
c) P+F=C-2
d) P+F=C+2

Answer: d [Reason:] Gibbs phase rule for general system is, P+F=C+2.

6. The degree of freedom is zero for a single-component condensed system. What is the maximum number of phases that can co-exist?
a) 0
b) 1
c) 2
d) 3

Answer: c [Reason:] Gibbs phase, P+F=C+2.

7. The degree of freedom at triple point in unary diagram for water zero.
The above give statement is
a) Correct
b) Incorrect
c) Partially correct
d) None of the mentioned

Answer: a [Reason:] Gibbs phase rule, P+F=C+2.

8. A rigid body possesses ______________ degrees of freedom.
a) One
b) Two
c) Four
d) Six

Answer: d [Reason:] It can have motion in six directions.

9. What is the degree of freedom for given sequence?
x = 3, 7, 4, 6, 9, 7, 2
a) One
b) Two
c) Four
d) Six

Answer: d [Reason:] DF = n-1.

10. What is the degree of freedom for given sequence?
x = 16,15,18,13, 14, 46, 82
y = 22,21,19,16
a) One
b) Two
c) Four
d) Six

Answer: a [Reason:] DF = n1-n2-2.

## Set 2

1. The number of degrees of freedom is the number of variables in a set of independent equations to which values must be assigned so that the equations can be solved.
The above given statement is
a) True
b) False
c) Can`t say
d) None of the mentioned

Answer: a [Reason:] The number of degrees of freedom is the number of variables in a set of independent equations to which values must be assigned so that the equations can be solved.

2-3. For degrees of freedom (Nd) expression, Nd = Nv – Ne
2. Nv represents
a) Number of variables
b) Number of equations
c) Number of free variables
d) None of the mentioned

Answer: a [Reason:] Nv is the number of the variables.

3. Ne represents
a) Number of variables
b) Number of equations
c) Number of free variables
d) None of the mentioned

Answer: b [Reason:] Ne is the number of the equations.

4. ______________variables are included in the analysis in contrast with the degrees of freedom.
a) Intensive
b) Extensive
c) Both Extensive and Intensive
d) None of the mentioned

Answer: c [Reason:] Intensive variables are included in the analysis in contrast with the degrees of freedom.

5. Gibbs phase rule for general system is
a) P+F=C-1
b) P+F=C+1
c) P+F=C-2
d) P+F=C+2

Answer: d [Reason:] Gibbs phase rule for general system is, P+F=C+2.

6. The degree of freedom is zero for a single-component condensed system. What is the maximum number of phases that can co-exist?
a) 0
b) 1
c) 2
d) 3

Answer: c [Reason:] Gibbs phase, P+F=C+2.

7. The degree of freedom at triple point in unary diagram for water zero.
The above give statement is
a) Correct
b) Incorrect
c) Partially correct
d) None of the mentioned

Answer: a [Reason:] Gibbs phase rule, P+F=C+2.

8. A rigid body possesses ______________ degrees of freedom.
a) One
b) Two
c) Four
d) Six

Answer: d [Reason:] It can have motion in six directions.

9. What is the degree of freedom for given sequence?
x = 3, 7, 4, 6, 9, 7, 2
a) One
b) Two
c) Four
d) Six

Answer: d [Reason:] DF = n-1.

10. What is the degree of freedom for given sequence?
x = 16,15,18,13, 14, 46, 82
y = 22,21,19,16
a) One
b) Two
c) Four
d) Six

Answer: a [Reason:] DF = n1-n2-2.

## Set 3

1. For a given system, number of variables is 6 and number of equations is 4. What is the number of degrees of freedom?
a) 2
b) 4
c) 6
d) 8

Answer: a [Reason:] Number of degrees of freedom = 6 – 4 = 2.

2. For a given system, number of variables is x and number of equations is y. What is the number of degrees of freedom?
a) x + y
b) x – y
c) x * y
d) x / y

Answer: b [Reason:] Number of degrees of freedom = x – y.

3. Degrees of freedom calculation treat ____________ variables.
a) Intensive
b) Extensive
c) Both Intensive and Extensive
d) None of the mentioned

Answer: a [Reason:] Degrees of freedom calculation treat intensive variables.

4. Work cannot be treated as a variable for degrees of freedom calculation. The given statement is
a) Correct
b) Incorrect
c) Depends on the type of work
d) None of the mentioned

Answer: b [Reason:] Work is an intensive variable, it can be treated as a variable for degrees of freedom calculation.

5. Entropy cannot be treated as a variable for degrees of freedom calculation. The statement is
a) Correct
b) Incorrect
c) Depends on the type of work
d) None of the mentioned

Answer: a [Reason:] Entropy is an extensive variable, it cannot be treated as a variable for degrees of freedom calculation.

6. Number of variables associated with a process stream, if the number of species in the stream are 3?
a) 1
b) 3
c) 5
d) 7

Answer: c [Reason:] Nv = Nsp + 2.

7. Number of compositions associated with a process stream, if the number of species in the stream are 5?
a) 1
b) 2
c) 3
d) 4

Answer: d [Reason:] Number of compositions = Nsp – 1.

8. Number of variables associated with a process stream if the number of species in the stream are 10?
a) 10
b) 12
c) 15
d) 17

Answer: b [Reason:] Nv = Nsp + 2.

9. What are the number of equations associated with 2 process stream, if the number of species in the stream are 5?
a) 7
b) 14
c) 21
d) 28

Answer: b [Reason:] Number of equations = 2(5+ 2) = 14.

10. Number of equations associated with 6 process stream, if the number of species in the stream are 4?
a) 6
b) 24
c) 36
d) 72

Answer: c [Reason:] Number of equations = 4(2 + 2) = 12.

## Set 4

1. For a given system, number of variables is 6 and number of equations is 4. What is the number of degrees of freedom?
a) 2
b) 4
c) 6
d) 8

Answer: a [Reason:] Number of degrees of freedom = 6 – 4 = 2.

2. For a given system, number of variables is x and number of equations is y. What is the number of degrees of freedom?
a) x + y
b) x – y
c) x * y
d) x / y

Answer: b [Reason:] Number of degrees of freedom = x – y.

3. Degrees of freedom calculation treat ____________ variables.
a) Intensive
b) Extensive
c) Both Intensive and Extensive
d) None of the mentioned

Answer: a [Reason:] Degrees of freedom calculation treat intensive variables.

4. Work cannot be treated as a variable for degrees of freedom calculation. The given statement is
a) Correct
b) Incorrect
c) Depends on the type of work
d) None of the mentioned

Answer: b [Reason:] Work is an intensive variable, it can be treated as a variable for degrees of freedom calculation.

5. Entropy cannot be treated as a variable for degrees of freedom calculation. The statement is
a) Correct
b) Incorrect
c) Depends on the type of work
d) None of the mentioned

Answer: a [Reason:] Entropy is an extensive variable, it cannot be treated as a variable for degrees of freedom calculation.

6. Number of variables associated with a process stream, if the number of species in the stream are 3?
a) 1
b) 3
c) 5
d) 7

Answer: c [Reason:] Nv = Nsp + 2.

7. Number of compositions associated with a process stream, if the number of species in the stream are 5?
a) 1
b) 2
c) 3
d) 4

Answer: d [Reason:] Number of compositions = Nsp – 1.

8. Number of variables associated with a process stream if the number of species in the stream are 10?
a) 10
b) 12
c) 15
d) 17

Answer: b [Reason:] Nv = Nsp + 2.

9. What are the number of equations associated with 2 process stream, if the number of species in the stream are 5?
a) 7
b) 14
c) 21
d) 28

Answer: b [Reason:] Number of equations = 2(5+ 2) = 14.

10. Number of equations associated with 6 process stream, if the number of species in the stream are 4?
a) 6
b) 24
c) 36
d) 72

Answer: c [Reason:] Number of equations = 4(2 + 2) = 12.

## Set 5

1. Mass per unit volume is called
a) Density
b) Molecular weight
c) Molar mass
d) Mole fraction

Answer: a [Reason:] Mass per unit volume is called density.

2. Densities for ________ and ________do not change significantly at ordinary conditions with pressure.
a) Gas, liquids
b) Liquids, solids
c) Solids, gas
d) None of the mentioned

Answer: b [Reason:] Densities for liquids and solids do not change significantly at ordinary conditions with pressure.

3. Specific volume is the inverse of
a) Volume
b) Pressure
c) Density
d) Flow rate

Answer: c [Reason:] Specific volume is the inverse of density.

4. Specific gravity is the ratio of density of a substance to the density of a reference material.
The above given statement is
a) True
b) False
c) Only for some specific materials
d) None of the mentioned

Answer: a [Reason:] Specific gravity is the ratio of density of a substance to the density of a reference material..

5. Density of water is
a) 1 gm/cm3
b) 1000 Kg/m3
c) 62.43 lb/ft3
d) All of the mentioned

Answer: a [Reason:] density of water = 1 gm/cm3 = 1000 Kg/m3 = 62.43 lb/ft3.

6. Specific gravity = 0.80 26˚/4˚ notation represents
a) Specific gravity when the solution is at 26˚C and the reference substance is at 4˚C is 0.80
b) Specific gravity when the solution is at 4˚C and the reference substance is at 26˚C is 0.80
c) Both a and b
d) Neither a nor b

Answer: a [Reason:] Simple rule for the representation.

7-8. Specific gravity of a liquid is 2.39.
7. What is the density of the liquid in g/cm3?
a) 2.39
b) 2.39102
c) 2.39×103
d) None of the mentioned

Answer: a [Reason:] Specific gravity is the ratio of the density of a substance to the density of a reference material.

8. What is the density of the liquid in kg/m3?
a) 2.39×103
b) 2.39
c) 2.39×102
d) None of the mentioned

Answer: a [Reason:] Specific gravity is the ratio of the density of a substance to the density of a reference material.

9. Specific gravity of a substance is 2.42. What is the density of the substance in lb/ft3?
a) 151
b) 252
c) 302
d) 402