Question

Units and measurments this lesson i need class work(short notes) plz send me guys plz plz dont keep irrelavent answers plz guys​

Answer 1

Answer:

What are units and measurements?

Units and measurement which is given in class 11 physics textbook offer basic knowledge about how the quantities are measured and the types of units that are used with them.

To get more details on Standard Measurement Units, visit here.

What is the system of units?

Some of the common systems of units that are used in physics are:

CGS system

FPS system

MKS system

SI system

What is known as the fundamental quantity?

Certain quantities have been chosen as fundamental quantities because physics is considered to be quantitative science. They are:

Length

Mass

Time

Electric Current

Thermodynamic Temperature

Amount of Substance

Luminous Intensity

What is SI unit?

The term stands for International System of Units which has regulated seven base units to be used to represent quantity around the world. These units are:

Metre

Kilogram

Second

Ampere

Kelvin

Mole

Candela

To get more details on SI unit, visit here.

Also Access

NCERT Solutions for class 11 Physics Chapter 2

NCERT Exemplar for class 11 Physics Chapter 2

Important Questions

Provide an Explanation for this statement:

“To call a dimensional quantity ‘large’ or ‘small’ is meaningless without specifying a

standard for comparison”. Reframe the following statements, in view of this :

(a) atoms are small structures

(b) a jet plane travels with a maximum speed

(c) Jupiter’s mass is very large

(d) the air contains a large number of molecules

(e) a proton massive than an electron

(f) the speed of sound is smaller than the speed of light.

Let’s suppose a unit of length is chosen such that the speed of light in the vacuum is unity. What will be the distance and displacement between the Sun and the Earth in terms of the new unit if light takes 8 min and 20 s to cover this distance?

Which is the most precise device for measuring length :

(a) vernier calipers with 20 divisions on the sliding scale?

(b) a screw gauge of pitch 1 mm and 100 divisions on the circular scale?

(c) an optical instrument that can measure length to within a wavelength of light?