practical skills Flashcards

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1
Q

define a “valid measurment”

A

it measures what it is supposed to be measured

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2
Q

what are accurate and precise results?

A
  • accurate: close to the real value
  • precise: close to other measurments
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3
Q

what is repeatability?

A

howprecise repeated meaurmnts are when they are taken by the
* same person
* same equipment
* under same conditions

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4
Q

what is reproducibility?

A

how precise meaurmnts are when they are taken by
* different people
* different equipment

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5
Q

what is the uncertainty of a measurment?

A

the interval within which the true value is expected to lie

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6
Q

what is a measurment error?

A

when there is a diference between the measured value and true value

types: systematic, random

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7
Q

what is a random error?

A

when the measured value varies around the true value in an unpredicatble way

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8
Q

what is systematic error?

A

a consistent difference between the measured and true values

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9
Q

define a ‘fair test’

A

only the independant varuable is allowed to affect the dependant variable

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10
Q

what are the prefixes and symbols from pico tera

A
  • pico (p)
  • nano (n)
  • micro (μ)
  • milli (m)
  • centi (c)
  • deci (d)
  • kilo (k)
  • mega (M)
  • giga (G)
  • tera (T)
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11
Q

What are the 7 base units ?

A
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12
Q

What are some scalar quantities?

A
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13
Q

What are some vector quantities?

A
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