Which of the following is in direct proportion ?( )
A. One side of a cuboid and its volume.
B. Speed of a vehicle and the distance travelled in a fixed time interval.
C. Change in weight and height among individuals.
D. Number of pipes to fill a tank and the time required to fill the same tank.
Answer
B
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Solution
We know that , distance \(=\) speed \(\times \) time. For fixed time interval , distance \(\propto\) speed. Thus for fixed time interval distance is directly proportional to speed. Hence option \((B)\) is correct. And remaininge all three option are Inverse proportion .
State whether the statement is true (T) or false (F): When two quantities \(x\) and \(y\) are in inverse proportion, then \(\frac {x}{y}\) is a constant.___