Fundamental Quantities and it’s unit

Fundamental Quantities and it’s unit

What is Unit?

The measurement of any physical quantity with reference of any standard is known as unit. There are Two types of units:-

• Fundamental units
• Derived units

1. Fundamental units:- the units for the fundamental quantities are called fundamental or base units. e.g. – meter, kilogram, second, ampere, kelvin, mole, candela.
2. Derived Units:- the units that can be expressed by the combinations of Fundamental units are called Derived Units. e.g. – m/s² , Pascal, joules etc.

What is Scalars and Vectors quantities?

1. Scalar Quantity:- the quantity that has magnitude only and no direction are known as scalar quantity. e.g. time, mass, length, temperature etc.
2. Vector Quantity:- the quantity that has both magnitude and direction are known as vector quantity. e.g. velocity, acceleration, displacement etc.

List of Fundamental or base Quantities, it’s SI units and symbols.

Fundamental Quantities and it’s unit

Base Quantity	SI units	Symbol
Length	metre	m
Mass	kilogram	kg
Time	second	s
Electric current	ampere	A
Temperature	kelvin	K
Amount of substance	mole	mol
Luminous intensity	candela	cd

Frequently Asked Questions:

 

1. SI unit of temperature is:

A) Kelvin
B) Plank
C) Mole
D) None of these

ANSWER= (A) Kelvin
Explain:-
Check Answer

 

2. How many fundamental units are there?

A) 3
B) 4
C) 6
D) 7

ANSWER= (D) 7
Explain:-
Check Answer

 

3. The SI unit of electric resistance is:

A) Joule
B) Ampere
C) Ohm
D) Volt

ANSWER= (C) Ohm
Explain:-
Check Answer

 

4. The SI unit of the amount of substance is_______.

A) Erg
B) Mole
C) Newton
D) Dyne

ANSWER= (B) Mole
Explain:-
Check Answer

 

5. What is the SI unit of Mass?

A) Kilogram
B) Pound
C) psi
D) candela

ANSWER= (A) Kilogram
Explain:-
Check Answer

 

6. The SI unit of Electric current is______.

A) Kelvin
B) volt
C) Ampere
D) Ohm

ANSWER= (C) Ampere
Explain:-
Check Answer

 

7. Which among the following is a scalar quantity?

A) Speed
B) Velocity
C) Acceleration
D) Displacement

ANSWER= (A) Speed
Explain:-
Check Answer

 

8. Which of the following is an example of vector quantity ?

A) energy
B) entropy
C) distance
D) Velocity

ANSWER= (D) Velocity
Explain:-
Check Answer

 

9. Density is defined as the ratio of:

A) Mass per unit volume
B) Volume per unit mass
C) Force per unit area
D) none of these

ANSWER= (A) Mass per unit volume
Explain:-
Check Answer

 

10. The SI unit of Density is:

A) Kg/m
B) Kg/m^2
C) Kg/m^3
D) N/m

ANSWER= (C) Kg/m^3
Explain:-
Check Answer

Read Also-

• Fundamental quantities and its units
• Force, its types and its units
• Motion and it’s type
• Surface Tension and it’s applications
• Explanations of elasticity and Hooke’s law
• Heat transfer and Modes of heat transfer

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