Class 11 Physics: Units and Measurements

Vocabulary practice flashcards covering dimensional analysis, units, significant figures, and error analysis for Class 11 Physics.

Dimensions of Force

$$[MLT^{-2}]$$

Dimensions of Kinetic Energy

$$[ML^2T^{-2}]$$

Dimensions of Coefficient of Viscosity

$$[ML^{-1}T^{-1}]$$

Surface tension (SI Units)

$$Nm^{-1}$$

Dimensions of Surface Tension

$$[ML^{0}T^{-2}]$$

Dimensional formula of Latent Heat

$$[M^{0}L^{2}T^{-2}]$$

Physical quantities with identical dimensions (Work/Torque)

Both work and torque have the dimensional formula $[ML^2T^{-2}]$.

Physical quantities with identical dimensions (Impulse/Momentum)

Both impulse and momentum have the dimensional formula $[MLT^{-1}]$.

Physical quantities with identical dimensions (Angular Momentum/Planck's constant)

Both angular momentum and Planck's constant have the dimensional formula $[ML^2T^{-1}]$.

SI units for $\text{kgm}^2\text{A}^{-1}\text{s}^{-3}$

Magnetic flux

Calorie

A unit of heat energy equal to approximately $4.2\,J$ (where $1\,J = 1\,kg\,m^2\,s^{-2}$).

Light year

The distance that light travels in one vacuum year, used as a unit of astronomical distance.

Parsecond (Parsec)

An astronomical unit of length used to measure large distances to objects outside the Solar System.

Astronomical unit

A unit of length, roughly the distance from the Earth to the Sun.

Significant figures

The digits in a measured quantity that include all certain digits plus the first uncertain digit, indicating the degree of precision.

Least count

The smallest value that can be measured by a measuring instrument, corresponding to the minimum division on its scale.

Precision

The consistency or repeatability of measurements; it is directly related to the number of significant figures.

Accuracy

How close a measured value is to the true value of the physical quantity.

Maximum error in addition

The sum of the absolute errors in the individual quantities, given by $\Delta R = \Delta A + \Delta B$.

Systematic errors

Errors that can be minimized by proper calibration of instruments, using high-quality apparatus, and eliminating personal bias.

Least count error

The error associated with the resolution of the instrument; for a standard geometry box scale, this value is typically $0.1\,cm$ or $1\,mm$.