Physical Quantity and Units

Question 1

Physical quantity is….

Answer 1

a quantity that can be measured

Made up of numeral magnitude and a unit.

Question 2

the scientific system of units is …

Answer 2

the Systeme d Unites (or SI system)

Question 3

What are the seven basic quantities?

Answer 3

Length, Mass, Time, Electric Current, Temperature, Amount of substance and Luminous intensity

Question 4

Give the base unit and symbol of the seven basic quantities

Answer 4

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)

Question 5

Derived quantities are …

Answer 5

obtained using the product of base units

Question 6

Homogeneous equation are…

Answer 6

where each term (left and right) has the same base units

Question 7

How to check homogeneity?

Answer 7

By checking the units of the left hand side and the right hand side of the equation. Both terns should have the same base units.
If not, the equation isn’t Homogeneous

Question 8

Name three measuring equipment in the lab.

Answer 8

metre rule, vernier caliper and micrometer