Question

# 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
Solution
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#### As we know the equation of a straight line is Y=mX+CLet 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∝XHence, X and Y are Directly proportional.Option C

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