PHYS 131- Exam 1 QUIZ Questions
and answers 100% correct 2025/2026
A student measures distance x to be 5 meters and area A to be 25 ft2. Which of these statements is
true?
A.[x2] = [A]
B.[5x] = A
C.x2 = [A]
D.x2 = A
E.None of these - correct answer ✔A
For a spherical alveolus of radius 100 μm, which is larger? - correct answer ✔Not sure
The diffusion constant D, describes how molecules jiggling around in a fluid drift. It has dimensions[D] =
L2/T
We have good reason to believe (we'll see it in a reading later) that D depends on the average distance a
molecules travels, λ, and it's average speed v.
If [λ] = L and [v] = L/T guess an equation that expresses D in terms of λ and v. - correct answer ✔D= λv
For a spherical alveolus of radius 10-4 m, which is larger? - correct answer ✔not sure
What is the best resolution to the alveolus paradox? - correct answer ✔Neither surface area nor
volume should be considered "bigger"; they should be thought of as incomparable because they're
different types of things.
QUIZ 1
For a spherical alveolus of radius 10-4 m, which is larger?
, -They are equal
-Not Sure
-Volume
-Surface Area - correct answer ✔Not Sure
QUIZ 1
As part of an exam a few years ago, a student wrote the following derivation of a final result. Without
knowing the problem, but knowing the dimensions of each quantity shown along the bottom state if
equation D is correct.
A.
B.
C.
D.
[M]=M [g]=L/T2 [h]=L [ω]=1/T [v]=L/T [R]=L [I]=ML2
True
False - correct answer ✔False
D is not a valid equation. It does not have consistent dimensions in each term
Can position be negative?
-Yes
-I have no idea.
-No
-It's impossible to say without more information. - correct answer ✔Yes
Which of these four vectors has a negative x-component and a positive y-component?
C
and answers 100% correct 2025/2026
A student measures distance x to be 5 meters and area A to be 25 ft2. Which of these statements is
true?
A.[x2] = [A]
B.[5x] = A
C.x2 = [A]
D.x2 = A
E.None of these - correct answer ✔A
For a spherical alveolus of radius 100 μm, which is larger? - correct answer ✔Not sure
The diffusion constant D, describes how molecules jiggling around in a fluid drift. It has dimensions[D] =
L2/T
We have good reason to believe (we'll see it in a reading later) that D depends on the average distance a
molecules travels, λ, and it's average speed v.
If [λ] = L and [v] = L/T guess an equation that expresses D in terms of λ and v. - correct answer ✔D= λv
For a spherical alveolus of radius 10-4 m, which is larger? - correct answer ✔not sure
What is the best resolution to the alveolus paradox? - correct answer ✔Neither surface area nor
volume should be considered "bigger"; they should be thought of as incomparable because they're
different types of things.
QUIZ 1
For a spherical alveolus of radius 10-4 m, which is larger?
, -They are equal
-Not Sure
-Volume
-Surface Area - correct answer ✔Not Sure
QUIZ 1
As part of an exam a few years ago, a student wrote the following derivation of a final result. Without
knowing the problem, but knowing the dimensions of each quantity shown along the bottom state if
equation D is correct.
A.
B.
C.
D.
[M]=M [g]=L/T2 [h]=L [ω]=1/T [v]=L/T [R]=L [I]=ML2
True
False - correct answer ✔False
D is not a valid equation. It does not have consistent dimensions in each term
Can position be negative?
-Yes
-I have no idea.
-No
-It's impossible to say without more information. - correct answer ✔Yes
Which of these four vectors has a negative x-component and a positive y-component?
C
