NEET Physics: Physics - Waves questions with solutions

Q1. In a standing wave, node is a point of

1. maximum strain
2. maximum pressure
3. maximum density
4. All of these

Answer: All of these

In a standing wave, a node is a point of zero displacement, but in a longitudinal wave that means the medium’s compression/rarefaction pattern is most intense there. So pressure, density, and strain can all be maximum at a node.

Q2. The average human ear can not distinguish the variation of intensity

1. if the variation is more than 100 times
2. if the variation is more than 16 times
3. if the variation is less than 16 times
4. if the variation is zero

Answer: if the variation is less than 16 times

The ear does not perceive very small intensity differences as distinct unless the change is large enough. A variation smaller than about 16 times is below the level the average ear can reliably distinguish, so that is the correct choice.