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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

Easy

Solution

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Correct option is
C

Directly proportional

As we know the equation of a straight line is
Let us assume and are two different physical quantity and C is any constant. and the graph between them is straight line.
 According to above equation,    
                                           
Hence,   and   are Directly proportional.
Option C

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