Practical Skills

Question 1

what does femto (f) mean

Answer 1

-15

Question 2

What does pick (p) mean

Answer 2

-12

Question 3

What does nano (n) mean

Answer 3

-9

Question 4

What does micro (ų) mean

Answer 4

-6

Question 5

What does milli (m) mean

Answer 5

-3

Question 6

What does kilo (k) mean

Answer 6

3

Question 7

What does mega (M) mean

Answer 7

6

Question 8

What does giga (G) mean ?

Answer 8

9

Question 9

What does tera (T) mean

Answer 9

12

Question 10

Base unit of length

Answer 10

M

Question 11

Base unit of mass

Answer 11

Kg

Question 12

Base unit of time

Answer 12

s

Question 13

Base unit of current

Answer 13

A (ampere)

Question 14

Base unit of temperature

Answer 14

K (kelvin)

Question 15

Base unit of an amount of substance

Answer 15

Mol

Question 16

Base unit of light intensity

Answer 16

Cd (candela )

Question 17

What are the 7 base unit

Answer 17

M, kg, s, A, K, mol, cd

Question 18

Acceleration in base units

Answer 18

a= change in v/change in t
ms-2

Question 19

base units of force (newton)

Answer 19

F =ma
kgms-2

Question 20

Pressure in base units (pascal)

Answer 20

p = f/A
Kgm-1s-2

Question 21

Energy in base units (joule)

Answer 21

E=W=fd
kgm2s-2

Question 22

Charge in base units (coulomb)

Answer 22

Q=It
As

Question 23

Potential difference in base units (volt)

Answer 23

V=E/Q
kgm2s-3A-1

Question 24

Resistance in base units (Ohm)

Answer 24

R = V/I
kgm2s-3A-2

Question 25

How much is a light year in m

Answer 25

(Speed of light x1 year in seconds) 9.46 x10^15

Question 26

How much is a kilowatt hour in joules

Answer 26

(10^3 x60x60) 3.6x10^6

Question 27

How much is the value of an electron volt in joules

Answer 27

E=Qv 1.6 x10^-19( change of an electron)

Question 28

How much is an amp-hour in coulombs

Answer 28

Q=i x t 3600 C

Question 29

what is 2500 cm^3 in m^3

Answer 29

0.0025 m^3 as divided by (100x100x100)

Question 30

equation for percentage uncertainty

Answer 30

(absolute uncertainty / measurement value ) x100

Question 31

uncertainty when there are repeated readings

Answer 31

half the range if it’s smaller than the apparatus uncertainty

Question 32

how do you combine uncertainties when: 1. Addition of variables 2. Subratction of variables

Answer 32

both the addition of absolute uncertainty

Question 33

how do you combine uncertainties when: 1. Multiplication of variables 2. Division of variables

Answer 33

addition of percentage uncertainty

Question 34

how do you combine uncertainties when: 1. Use of powers e.g. a^b

Answer 34

b x percentage uncertainty of a

Question 35

how do you combine uncertainties when: 1. multiply by a constant a

Answer 35

multiply the absolute unc by a Percentage uncertainty is unchanged