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Byju's Answer
Standard XII
Physics
Shear Stress
Which one of ...
Question
Which one of the following quantities has not been expressed in proper units ?
A
S
t
r
e
s
s
S
t
r
a
i
n
=
N
/
m
2
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B
S
u
r
f
a
c
e
t
e
n
s
i
o
n
=
N
/
m
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C
E
n
e
r
g
y
=
k
g
−
m
/
s
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D
P
r
e
s
s
u
r
e
=
N
/
m
2
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Solution
The correct option is
D
E
n
e
r
g
y
=
k
g
−
m
/
s
Stress has the units of Force/Area =
N
/
m
2
, while strain (=
Δ
l
/
l
) is dimensionless. So option A is correct.
Surface tension is Force/Length, thus
N
/
m
, hence B is also correct.
Energy has the units of
[
M
L
2
T
−
2
]
, hence the units have to be
k
g
m
2
/
s
2
. Thus C is incorrect option.
Pressure is Force/Area =
N
/
m
2
, thus D is again correct.
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