When a graph between two physical quantities is a straight line, the two quantities are
A
Both constant
B
Independent of each other
C
Directly proportional
D
Inversely proportional
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Solution
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As we know the equation of a straight line is Y=mX+C
Let us assume X and Y are two different physical quantity and C is any constant. and the graph between them is straight line.
According to above equation,
Y∝X
Hence, X and Y are Directly proportional.
Option C
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