UNIT-1: SI System Of Units

Question 1

7 basic units

Answer 1

• Length = meters (m)
• Mass = kilograms (kg)
• Time = seconds (s)
• Electric current = Amperes (A)
• Temperature = kelvin (k)
• Amount of substance = mole (mol)
• Luminous intensity = candela (cd)

Question 2

Give the general conversions

Answer 2

D C MUNP FAZY
Da h KMGT PEZY

1 2 3 6 9 12 15 18 21 24

Deci, centi, milli, micro, nano, pico, femto, atto, zepto, yocto

Deca, hecto, kilo, mega, giga, tera, peta, exa, zetta, yetta

Question 3

Length conversions

Answer 3

1m = 100cm = 1000mm
1m = 10²cm = 10³mm

Question 4

Area

Answer 4

1m² = 10⁴cm² = 10⁶mm²

Question 5

Volume

Answer 5

1m³ = 10⁶cm³ = 10⁹mm³

Question 6

Mass

Answer 6

1ton = 10³kg = 10⁶g

Question 7

Scalar

Answer 7

A physical quantity that consists of only magnitude

Question 8

Vector

Answer 8

A physical quantity that consists of both magnitude and direction

Question 9

Coplanar forces

Answer 9

System of forces acting in one plane

Question 10

Coplanar concurrent forces

Answer 10

A system of forces acting in one plane, and extending from a single point

Question 11

Resultant vector

Answer 11

A single vector that has the same effect as all the vectors in the system

Question 12

Unit vector

Answer 12

A vector with a magnitude of one