Mmm MCQ Test

Both 'a' and 'b' are associated with measuring devices. Damping refers to the ability of a measuring device to reduce or eliminate oscillations or vibrations in the measurement, ensuring a stable and accurate reading. Sensitivity, on the other hand, refers to the responsiveness of a measuring device to changes in the quantity being measured. A highly sensitive device will detect even small changes in the measured quantity. Therefore, both damping and sensitivity are important characteristics of measuring devices.

Accuracy refers to the degree of closeness between the measured value of a certain quantity and its true value. It indicates how well the measurement reflects the actual value. Precision, on the other hand, refers to the degree of consistency or reproducibility of the measured values. Standard and sensitivity are not directly related to the closeness of the measured value to the true value.

SI stands for the International System of Units, which is an internationally recognized and accepted unit system. It is used in many fields including science, engineering, and everyday measurements. The SI system is based on seven base units, which are the meter, kilogram, second, ampere, kelvin, mole, and candela. These base units can be combined to form derived units for various quantities. The SI system provides a standardized and coherent way of measuring and expressing physical quantities, making it easier for people around the world to communicate and work together.

A measuring tape is a line standard of measurement because it is a flexible tool used to measure the length of objects or distances. It consists of a long strip of material, typically made of metal or cloth, with markings or numbers indicating units of measurement. The tape can be extended or retracted to measure various lengths accurately. It is commonly used in construction, carpentry, sewing, and other fields where precise measurements are required.

Sensitivity refers to the ability of a measuring device to detect small differences in the quantity being measured. A highly sensitive device can detect even the slightest changes in the measured quantity, while a less sensitive device may not be able to detect small variations. Therefore, sensitivity is the correct answer for the ability of a measuring device to detect small differences in the quantity being measured.

The correct answer is Both 'a' and 'b'. Wringing occurs due to both atmospheric pressure and molecular attraction. Atmospheric pressure plays a role in pushing the liquid out of the fabric when it is twisted or squeezed. Molecular attraction, on the other hand, causes the liquid molecules to stick together, allowing the fabric to retain some of the liquid even after wringing.

The bevel protector, calibrated angles, and clinometer are all tools that are commonly used to measure angles. However, optical flats are not used for measuring angles. Optical flats are used in optics and metrology to measure the flatness of surfaces, not angles. Therefore, optical flats do not belong in the category of tools used to measure angles.

The degree of closeness of the measured value of a certain quantity with its true value is known as the accuracy of the measurement. Accuracy is determined by calculating the difference between the true value and the measured value. Therefore, the correct answer is "True value - Measured value".

Indirect comparison refers to the process of comparing an unknown with a standard using a calibrated system. This means that the comparison is not done directly between the unknown and the standard, but rather through an intermediary or by measuring different properties. In this method, the calibrated system ensures accuracy and reliability in the comparison process. Therefore, the correct answer for this question is "Indirect Comparison".

A plug gauge is used to check the diameters of holes. It is a cylindrical metal rod with a specific diameter that is inserted into the hole being measured. If the gauge fits into the hole without any resistance, it means that the hole is within the acceptable diameter range. If the gauge does not fit or fits loosely, it indicates that the hole is either too small or too large. Therefore, a plug gauge is an effective tool for verifying the accuracy and precision of hole diameters in various applications.