Topic 1.2 - SI Quantities and Base Units

Question 1

What is a Physical Quantity ?

Answer 1

A feature of something that can be measured.

Question 2

What is a Base Unit?

Answer 2

A fundamental unit that is defined arbitrarily and not by combinations of other units.

Question 3

What is a Derived Unit?

Answer 3

Units expressed by products of powers of one or more of the base units.

Question 4

What is a Homogeneous Equation?

Answer 4

An equation in which each term has the same base units. ( A ‘balanced’ equation)

Question 5

What is the unit and symbol for Mass?

Answer 5

Kilogram/kg

Question 6

What is the unit and symbol for Length?

Answer 6

Meter/m

Question 7

What is the unit and symbol for Time?

Answer 7

Second/s

Question 8

What is the unit and symbol for Electric Current?

Answer 8

Ampere(amp)/A

Question 9

What is the unit and symbol for Thermodynamic Temperature?

Answer 9

Kelvin/K

Question 10

What is the unit and symbol for Amount of Substance?

Answer 10

Mole/mol

Question 11

What is the unit and symbol for Luminous Intensity?

Answer 11

Candela/cd

Question 12

Tera (Symbol & Multiplying Factor)

Answer 12

Symbol: T

Multiplying factor: 10^12

Question 13

Giga (Symbol & Multiplying Factor)

Answer 13

Symbol: G

Multiplying factor: 10^9

Question 14

Mega (Symbol & Multiplying Factor)

Answer 14

Symbol: M

Multiplying factor: 10^6

Question 15

Kilo (Symbol & Multiplying Factor)

Answer 15

Symbol: k

Multiplying factor: 10^3

Question 16

Deci (Symbol & Multiplying Factor)

Answer 16

Symbol: d

Multiplying factor: 10^-1

Question 17

Centi (Symbol & Multiplying Factor)

Answer 17

Symbol: c

Multiplying factor: 10^-2

Question 18

Milli (Symbol & Multiplying Factor)

Answer 18

Symbol: m

Multiplying factor: 10^3

Question 19

Micro (Symbol & Multiplying Factor)

Answer 19

Symbol: μ

Multiplying factor: 10^-6

Question 20

Nano (Symbol & Multiplying Factor)

Answer 20

Symbol: n

Multiplying factor: 10^-9

Question 21

Pico (Symbol & Multiplying Factor)

Answer 21

Symbol: p

Multiplying factor: 10^-12

Question 22

Femto (Symbol & Multiplying Factor)

Answer 22

Symbol: F

Multiplying factor: 10^-15

Question 23

Frequency (Unit & Derived Unit)

Answer 23

Unit: hertz (Hz)

Derived unit: s^-1

Question 24

Velocity (Unit & Derived Unit)

Answer 24

Unit: m s^-1

Derived unit: m s^-1

Question 25

Acceleration (Unit & Derived Unit)

Answer 25

Unit: m s^-2

Derived unit: m s^-2

Question 26

Force (Unit & Derived Unit)

Answer 26

Unit: newton (N)
Derived unit: kg m s^-2

(Mass x Acceleration)

Question 27

Energy (Unit & Derived Unit)

Answer 27

Unit: joule (J)

Derived unit: kg m^2 s^-2

Question 28

Power (Unit & Derived Unit)

Answer 28

Unit: watt (W)
Derived unit: kg m^2 s^-3

(Energy/second)

Question 29

Electric Charge (Unit & Derived Unit)

Answer 29

Unit: coulomb (C)

Derived unit: A s

Question 30

Potential Difference (Unit & Derived Unit)

Answer 30

Unit: volt (V)
Derived unit: kg m^2 s^-3 A^-1

(Power / amp)

Question 31

Electrical Resistance (Unit & Derived Unit)

Answer 31

Unit: ohm (Ω)

Derived unit: kg m^2 s^-3 A^-2

Question 32

Specific Heat Capacity (Unit & Derived Unit)

Answer 32

Unit: J kg^-1 K^-1

Derived unit: m^2 s^-2 K^-1

Question 33

Density (Unit & Derived Unit)

Answer 33

Unit: D(p)
Derived unit: kg m^-3

(Mass/Volume)

Question 34

Pressure (Unit & Derived Unit)

Answer 34

Unit: pascal (Pa)

Derived unit: kg m^-1 s^-2

Question 35

Symbol for physical quantity printed in..

Answer 35

Italics.

Question 36

Unit for physical quantity printed in..

Answer 36

Roman.

Question 37

Scientists around the world use what system which is based on the metric system of measurement?

Answer 37

Systeme International (SI)

Question 38

All quantities, apart from the base quantities, can be expressed in what units?

Answer 38

Derived Units.

Question 39

Derived units consist of. .

Answer 39

. .some combination of the base units. The base units may be multiplied together or divided by one another, but never added or subtracted.