MCQ
When a graph between two physical quantities is a straight line, the two quantities are:
- ABoth constant
- BIndependent of each other
- ✓Directly proportional
- DInversely proportional
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,
$\text{Y}\propto\text{X}$
Hence, $X$ and $Y$ are Directly proportional.
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