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JEE Main Physics Class 11 Physical world and Measurements Part 2 Questions
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© examsnet.com
Question : 10
Total: 100
A physical quantity
Q
is found to depend on quantities
a
,
b
,
c
by the relation
Q
=
a
4
b
3
c
2
. The percentage error in a, b and
c
are
3
%
,
4
%
and
5
%
respectively. Then, the percentage error in
Q
is :
[29-Jan-2024 Shift 2]
66
%
43
%
34
%
14
%
Validate
Solution:
👈: Video Solution
Sol.
Q
=
a
4
b
3
c
2
∆
Q
Q
=
4
∆
a
a
+
3
∆
b
b
+
2
∆
c
c
∆
Q
Q
×
100
=
4
(
∆
a
a
×
100
)
+
3
(
∆
b
b
×
100
)
+
2
(
∆
c
c
×
100
)
%
error in
Q
=
4
×
3
%
+
3
×
4
%
+
2
×
5
%
=
12
%
+
12
%
+
10
%
=
34
%
© examsnet.com
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