When a graph between two physical quantities is a straight line with a positive non zero slope, the two quantities are:

constant

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independent of each other

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directly proportional

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inversely proportional

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Solution

The correct option is C directly proportional
Let's consider that $x$ is directly proportional to $y$ .
So, we can write $y \propto x$
Or $y = m x$ ......(1)
where $m$ is the slope of the curve which is non zero.
Equation (1) represents a straight line on the $y$ Vs $x$ graph.

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When a graph between two physical quantities is a straight line with a positive non zero slope, the two quantities are:

The correct option is C directly proportionalLet's consider that x is directly proportional to y.So, we can write y∝xOr y=mx ......(1)where m is the slope of the curve which is non zero.Equation (1) represents a straight line on the y Vs x graph.

The correct option is C directly proportional
Let's consider that $x$ is directly proportional to $y$ .
So, we can write $y \propto x$
Or $y = m x$ ......(1)
where $m$ is the slope of the curve which is non zero.
Equation (1) represents a straight line on the $y$ Vs $x$ graph.