Strain is not a fundamental quantity. Fundamental quantities are those that cannot be defined in terms of other quantities. Strain, on the other hand, can be defined as the ratio of the change in length of an object to its original length. So, it is a derived quantity.
However, it is correct that strain is measured in a laboratory. This is because it is a very small quantity and it is difficult to measure it directly. Instead, scientists use strain gauges to measure strain indirectly. A strain gauge is a device that changes its electrical resistance when it is subjected to strain. By measuring the change in resistance of the strain gauge, scientists can calculate the amount of strain that the object is experiencing.
Finally, it is also correct that strain is dimensionless. This is because it is the ratio of two quantities with the same dimensions (length). So, the units of strain cancel out, leaving a dimensionless quantity.
Here is a summary of your statements:
- Strain is measured in a laboratory. True
- Strain is a fundamental quantity. False
- Strain is the ratio of the dimension of length to the dimension of length. True
- Strain is dimensionless. True
