3.1: Measurements And Their Errors

Question 1

What is the units for Mass (1)

Answer 1

kg (kilograms)

Question 2

What is the units for Length (1)

Answer 2

m (metres)

Question 3

What is the units for Time (1)

Answer 3

s (seconds)

Question 4

What is the units for the Amount of substance (1)

Answer 4

mol (moles)

Question 5

What is the units for Temperature (1)

Answer 5

K (kelvin)

Question 6

What is the units for Electric current (1)

Answer 6

A (amperes)

Question 7

What is the multiplier for prefix Tera(1)

Answer 7

T, 10^12

Question 8

What is the multiplier for prefix Giga (1)

Answer 8

G, 10^9

Question 9

What is the multiplier for prefix Mega (1)

Answer 9

M, 10^6

Question 10

What is the multiplier for prefix Kilo (1)

Answer 10

k, 10^3

Question 11

What is the multiplier for prefix Centi (1)

Answer 11

c, 10^-2

Question 12

What is the multiplier for prefix Milli (1)

Answer 12

m, 10^-3

Question 13

What is the multiplier for prefix Micro (1)

Answer 13

µ, 10^-6

Question 14

What is the multiplier for prefix Nano (1)

Answer 14

n, 10^-9

Question 15

What is the multiplier for prefix Pico (1)

Answer 15

p, 10^-12

Question 16

What is the multiplier for prefix Femto (1)

Answer 16

f, 10^-15

Question 17

What are Random errors (1)

Answer 17

Errors that affect precision and cause a spread about the mean. You cant get rid of them all

Question 18

How to reduce random errors (1)

Answer 18

Repeat and calculate a mean

Question 19

What are Systematic errors (1)

Answer 19

Errors that affect accuracy and cause all results to be too high or too low by the same amount each time.

Question 20

What causes systematic errors (2)

Answer 20

the method used , the apparatus used

Question 21

How to reduce systematic error (1)

Answer 21

calibrate apparatus by measuring a known value, if reading is inaccurate systematic error can be identified easily

Question 22

What is Zero error (1)

Answer 22

A type of systematic error that occurs when a balance is not zeroed correctly.

Question 23

What is Parallax error (1)

Answer 23

A type of systematic error that occurs when reading a scale at a different angle.

Question 24

What is Precision (2)

Answer 24

Precise measurements are consistent, they fluctuate slightly about a mean value

Question 25

What is Repeatability (1)

Answer 25

If the original experimenter can redo the experiment with the same equipment and method then get the same results it is repeatable.

Question 26

What is Reproducibility (1)

Answer 26

If the experiment is redone by a different person or with different techniques and equipment and the same results are found, it is reproducible.

Question 27

What is Resolution (1)

Answer 27

The smallest change in the quantity being measured that gives a recognisable change in reading.

Question 28

What is Accuracy (1)

Answer 28

A measurement close to the true value

Question 29

How could u Reduce percenatage Uncertainty (1)

Answer 29

you can measure larger quantities.

Question 30

How to calculate Repeated Data Uncertainty (1)

Answer 30

range / 2

Question 31

What happens to the absolute uncertainty when u add/subtract data (1)

Answer 31

Add the absolute uncertainties

Question 32

How do u calculate Percentage Uncertainty (1)

Answer 32

(uncertainty/value) × 100.

Question 33

What happens to the absolute uncertainty when Multiplying/Dividing Data (1)

Answer 33

Add the percentage uncertainties .

Question 34

What happens to the absolute uncertainty when Raising to a Power (1)

Answer 34

Multiply the percentage uncertainty by the power

Question 35

What are Error Bars (2)

Answer 35

shows uncertainties , line of best and worst fit must go thru all error bars

Question 36

How to calculate Gradient Uncertainty (3)

Answer 36

draw the steepest and shallowest line of best fit, calculate their gradients, uncertainty = difference between the gradients

Question 37

If the lines if best/worst fit have diff y intercepts how should u calculate the percentage uncertainty (1)

Answer 37

Best y intercept - worst y intercept / best y intercept x100

Question 38

How should u make estimations of physical quantities (1)

Answer 38

- Give the estimate of an order of magnitude to the nearest power of 10