Two students measure a particular length using the same instrument one after the other. They will always estimate an equal value even if they vary the position of their eyes.

True

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False

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Solution

The correct option is B
False

They may encounter some human error, for example, parallax error. Parallax error arises when the reading is taken from random angles. It is a non-technical (human) error in which there is a difference in the readings if the readings are taken at different angles from the line of sight. Hence, to avoid this error, we must always take the readings by placing our eyes perpendicularly above the markings.

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Q. Two particles undergo SHM along parallel lines with the same time period

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and equal amplitudes. At a particular instant, one particle is at its extreme position while the other is at its mean position. They move in the same direction. They will cross each other after a further time of

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