#### 1. Name three important fundamental quantities

**Answer: **The three important fundamental quantities are **Mass, Length, **and **time**

#### 2. Why is **Mass,
length **and **Time **most important
fundamental quantities?

**Answer: **They are most important fundamental quantities because, the units of these quantities form base unit upon which the units of other quantities depend on.

### 3. What is the full meaning of S.I. Units?

**Answer: **The S.I.Units
stand for system international units that is the universal accepted measuring
units.

#### 4. What are the units of Luminous intensity and Amount of substance respectively?

**Answer: **They are **candela (cd) and mole (mol) **respectively

### 5. What are derived quantities?

**Answer: **The derived
quantities are those quantities obtained by combination of units of fundamental
quantities. Examples, the unit of volume is obtained by multiplying the unit of
length, that is m x m x m =m^{3}, density is also derived quantity is
give by the ratio of mass and volume that is Kg/m^{3 }

#### 6. List the example of fundamental quantities and their
units.

**Answer: ** The examples of fundamental quantities are as
follow:

(a).Length , the unit is **meter (m)**

(b).Mass, the unit is **Kilogram
(KG)**

(C).Time, the unit is **Second
(s)**

(d).Temperature, the unit is **Kelvin (k)**

(e). Electric current, the unit is **Ampere**

(f).Amount of substance, the unit is b **Mole (mol)**

(g). Luminous intensity, the unit is **Candela (cd)**

### 8. List 12 derived quantities and their units

**Answer: **(i) Area,
the units is **m**^{2}

(ii)
Volume, the unit is **m**^{3}

(ii).
Density, the unit is **Kg/m**^{3}

(iv).
Speed, the unit is **m/s**

(v).
Velocity, the unit is **m/s**

(vi). Acceleration, the unit is **m/s**^{2}

(vii). Force, the unit is **Newton (N)**

(viii).
Weight, the unit is **Newton (N)**

(ix) Momentum, the unit is **Newton second (Ns)**

(x).
Pressure, the unit is **Pascal (Pa) or N/m**^{2}

(xi) Power, the unit is **watts (w) or N/m 0s J/s**

** ** (xii) Work/Energy, the unit is **Joules (J) or Nm**

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