Measurements and Experimentation

Flashcards generated from lecture notes on Measurements and Experimentation, focusing on units, systems of units, and derived units.

Measurement is ___

The process of comparison of the given physical quantity with the known standard quantity of the same nature.

A Unit is ___

A quantity of a constant magnitude which is used to measure the magnitudes of other quantities of the same nature.

Units are of two kinds: ___ and ___

Fundamental or basic units and Derived units

A fundamental unit is that which is ___

Independent of any other unit or which can neither be changed nor can be related to any other fundamental unit.

Derived units are those which ___

Depend on the fundamental units or which can be expressed in terms of the fundamental units.

In the C.G.S system, the unit of length is ___, of mass is __, and of time is ____

Centimetre (cm), gram (g), and second (s).

In the F.P.S system, the unit of length is ___, of mass is __, and of time is ____

Foot (ft), pound (lb), and second (s).

In the M.K.S system, the unit of length is ___, of mass is __, and of time is ____

Metre (m), kilogramme (kg), and second (s).

The seven fundamental quantities in the S.I. system are ___, __, ____, __, ____, __, and ____

Length, mass, time, temperature, luminous intensity, current, and amount of substance.

The two complementary fundamental units are ___ and ___

Radian and steradian

Hecto means ___

100

Centi means ___

10^-2

Nano means ___

10^-9

A light year is ___

The distance travelled by light in vacuum, in one year.

One Angstrom (Å) is ___

10^-10 metre

One fermi (f) is ___

10^-15 metre

The S.I. unit of mass is ___

Kilogram (kg)

The S.I. unit of time is ___

Second (s)

One second is the time interval of ___

9,192,631,770 vibrations of radiation corresponding to the transition between two unperturbed ground state hyperfine levels of the cesium 133 atom.

One minute(min) is the duration of ___

60 seconds

Work or Energy is ___

force x displacement