Introduction to Units and Measurement

True (A)

<p>Centimeter (A)</p> Signup and view all the answers

<p>radian</p> Signup and view all the answers

<p>cd</p> Signup and view all the answers

<p>angstrom</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>[MLT-2]</p> Signup and view all the answers

<p>ampere</p> Signup and view all the answers

<p>Dimensional homogeneity ensures consistency and correctness in an equation.</p> Signup and view all the answers

<p>Pure numbers, ratios of similar quantities, and angles.</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Angular velocity (ω) is measured in radians per second.</p> Signup and view all the answers

<p>Unit of measurement (A)</p> Signup and view all the answers

<p>Both A and B (A)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>Always round up the final answer to the next significant figure (B)</p> Signup and view all the answers

The internationally accepted standard used for measuring a physical quantity. It is a reference point for comparison.

The measurement of a physical quantity is expressed as a numerical value accompanied by a unit.

Units used for the fundamental quantities are called fundamental or base units. Examples include metre (m), kilogram (kg), second (s), etc.

Units derived from base units are called derived units. These units are expressed as combinations of base units. Examples include Newton (N), Joule (J), Watt (W), etc.

A complete set of base units and derived units used for measurement forms a system of units.

A system of units based on centimetre, gram, and second as base units.

A system of units based on foot, pound, and second as base units.

A system of units based on metre, kilogram, and second as base units.

The internationally accepted system of units based on seven base units and derived units.

The basic units in the SI system, which form the base for all other units.

A unit of length in the SI system, defined as the distance travelled by light in vacuum in a specific time interval.

A unit of mass in the SI system, defined using the Planck constant.

A unit of time in the SI system, defined using the frequency of a specific atomic transition.

A unit of electric current in the SI system, defined using the elementary charge.

A unit of thermodynamic temperature in the SI system, defined using the Boltzmann constant.

A unit of amount of substance in the SI system, defined using the Avogadro constant.

A unit of luminous intensity in the SI system, defined using the luminous efficacy.

The ratio of length of arc to the radius of the circle, measured in radians.

The ratio of the intercepted area of the spherical surface to the square of its radius, measured in steradians.

A dimensionless quantity representing the ratio of two similar quantities.

Digits that indicate the precision of a measurement, including the reliable digits and the first uncertain digit.

The smallest unit of measurement that the measuring instrument can detect.

A process of expressing a number with fewer digits, without significantly changing its value.

Rules for determining the number of significant figures in a calculation involving numerical values.

Mathematical representations of the physical quantities using fundamental units.

Equations that express the relationship between physical quantities using their dimensional formulae.

A technique used to check the consistency of physical equations and to derive new relationships.

Applications of dimensional analysis for obtaining useful information about physical quantities.

Retained for general use but not part of the SI system.

Common prefixes used to represent multiples and submultiples of SI units.

The SI prefix kilo (k) represents a multiple of 10³.

The SI prefix milli (m) represents a submultiple of 10⁻³.