Question

what is the graph of d vs v ? Explain with reason.

Answer 1

≡≡≡≡≡≡≡≡≡≡≡≡≡≡

    ANSWER

≡≡≡≡≡≡≡≡≡≡≡≡≡≡

The vertical axis represents the velocity of the object. This probably sounds obvious, but be forewarned—velocity graphs are notoriously difficult to interpret. People get so used to finding velocity by determining the slope—as would be done with a position graph—they forget that for velocity graphs the value of the vertical axis is giving the velocity.

Answer 2

The correct option will be (C).
As we have $PM=\delta \times RT$ where $\delta$ is density, when $\frac{P}{T}$ is constant, we get $\delta$ constant, hence a line with slope zero on a graph of $\delta$ vs. V.
When T is constant and P increases, $\delta$ increases. Applying this logic to every part, you have C as the required graph.