Units and Dimensons

Question 1

How many base quantities are there?

Answer 1

There are 7 base quantities

Question 2

What are the base quantities?

Answer 2

Length
Mass
Time
Temperature
Elastic Current
Luminous Intensity
Amount of Substance \

Question 3

What is a dimension?

Answer 3

It is the basic quantity (Like length)

Question 4

What is dimension and Si Unit of Length?

Answer 4

L
Metre (m)

Question 5

What is dimension and Si Unit of Mass

Answer 5

M
Kilogram (Kg)

Question 6

What is dimension and Si Unit of Time

Answer 6

T
Seconds (s)

Question 7

What is dimension and Si Unit of Temperature

Answer 7

K
Kelvin (K)

Question 8

What is dimension and Si Unit of Electric Current

Answer 8

I
Ampere (A)

Question 9

What is dimension and Si Unit of Luminous Intensity

Answer 9

J
Candela (cd)

Question 10

What is dimension and Si Unit of Amount of Substance

Answer 10

N
mol (Moles)

Question 11

What is dimension and Si Unit of Time

Answer 11

T
Time (s)

Question 12

What are derived quantities?

Answer 12

Quantities that you get by multiplying the same or different base units

Question 13

What are the derived units?

Answer 13

Area
Speed
Density
Force

Question 14

What are the dimensions and Si unit of Area

Answer 14

L^2
m^2

Question 15

What are the dimensions and Si unit of Speed

Answer 15

LT^-1
ms^-1

Question 16

What are the dimensions and Si unit of Density

Answer 16

ML^-3
kg m^-3

Question 17

What are the dimensions and Si unit of Force

Answer 17

MLT^-2
kg m s^-2

Question 18

How much is a kilo

Answer 18

1000
10^3

Question 19

How much is a Tera

Answer 19

1 TB= 10^12

Question 20

How much is a milli

Answer 20

1mm= 10^-3

Question 21

How much is a micro

Answer 21

1 us= 10^-6

Question 22

What is the rule of adding/subtracting quantities?

Answer 22

They must be of the same dimension and unit, if it isnt the same unit then standardize the units (Making them the same)

Question 23

What is the rule when multiplying/dividing quantities?

Answer 23

You can multiply quantities even if they have different dimensions however a new quantity is created with a new name

Question 24

What are dimensionless quantities

Answer 24

Quantities with no units. eg (Strain)

Question 25

What is dimensional analysis?

Answer 25

Checking if each quantity in an equation has the same dimensions, if they do not then the equation is not correct. It acts as an initial check.

Question 26

What is 1 litre to cm?

Answer 26

1000cm^3

Question 27

Is this equation dimensionally correct? -Force= density x area x velocity -pressure = height × gravity acceleration × density -power = speed × force -energy = mass × (speed)2

Question 28

How to convert from Hours to Second

Answer 28

Multiply by 60 to get minutes then multiply again to get seconds

Question 29

How to convert from M to cm to mm

Answer 29

From M to cm you multiply by 100 From cm to mm multiply by 10

Question 30

How to convert between m/s to km/h