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WorksheetsModule 1 and 2 Retrieval KAH
Total questions: 31
Worksheet time: 1hrs 1mins
Select 3 SI base quantities.
Charge
Force
Mass
Length
Luminous Intensity
Select 3 SI base quantities.
Time
Electric current
Amount of substance
Moment
Momentum
Select a SI base quantity and its unit.
Temperature
Mass
Celsius
Kelvin
Grams
If a formula is homogeneous, what does it mean?
It agrees with theory
The units of one side are the same as the units of the other
It shows a directly proportional relationship
It is from classical rather than quantum physics
The prefixes tera, centi and femto mean:
x10^12, x10^-2, x10^-15
x10^15, x10^-2, x10-15
x10^12, x10^-3, x10-15
x10^12, x10^-2, x1--12
The true value of a quantity would theoretically be found by using...?
A perfect measuring instrument
An electronic balance
It can't be found
The error in a measurement is...?
The difference between the measured value and the true value
The smallest increment on the measuring device
Due to human error such as misreading
The absolute uncertainty in a measurement is...?
An estimate of the maximum error of a measurement
An estimate of the minimum error of a measurement
An estimate of the error of a measurement expressed as a ratio of the true value
In many circumstances, the absolute error in a measurement is equal to...?
Plus/minus the smallest increment that the instrument can measure
The zero error on the measuring instrument
Human reaction time
When adding or subtracting two or more measurements, we find the overall uncertainty by...?
Adding or subtracting the percentage uncertainties
Adding the percentage uncertainties
Adding or subtracting the absolute uncertainties
Adding the absolute uncertainties
When measurements are multiplied together, the overall uncertainty in the calculated quantity is found by...?
Adding together the absolute uncertainties
Adding or subtracting the percentage uncertainties
Adding the percentage uncertainties
Multiplying the percentage uncertainties
What doe the worst acceptable lines of a graph show?
The expected range of possible positions of the line of best fit
How the line of best fit would look if it was drawn incorrectly
How can uncertainty in the gradient of a straight-line graph be found?
Draw line of best fit and worst acceptable line, and find the difference in their two gradients. Express as a percentage using the best fit line's gradient as denominator.
Draw line of best fit and worst acceptable line, and find the difference in their two gradients. Express as percentage using the worst fit line's gradient as denominator.
Draw line of best fit and worst acceptable line, and measure the largest gap between the two.
Identify the two main categories of experimental error that can affect the uncertainty in measurements.
Random
Systematic
Human error
Zero error
What is a random error?
An error that causes readings to be spread about the true value, due to results varying in an unpredictable way from one measurement to the next.
An error that causes readings to be different from the true value by a predicatble amount.
When an instrument does not read zero when it should
The error that occurs when the line of sight of the person making a measurement is not perpendicular to the scale.
What is a systematic error?
An error that causes readings to be spread about the true value, due to results varying in an unpredictable way from one measurement to the next.
An error that causes readings to be different from the true value by a predicatble amount.
When an instrument does not read zero when it should
The error that occurs when the line of sight of the person making a measurement is not perpendicular to the scale.
What is a zero error?
An error that causes readings to be spread about the true value, due to results varying in an unpredictable way from one measurement to the next.
An error that causes readings to be different from the true value by a predicatble amount.
When an instrument does not read zero when it should
The error that occurs when the line of sight of the person making a measurement is not perpendicular to the scale.
What is a parallax error?
An error that causes readings to be spread about the true value, due to results varying in an unpredictable way from one measurement to the next.
An error that causes readings to be different from the true value by a predicatble amount.
When an instrument does not read zero when it should
The error that occurs when the line of sight of the person making a measurement is not perpendicular to the scale.
How can the effect of random errors be reduced?
By making more measurements and calculating a mean
By ensuring the instrument is reading zero when it should
What effect do random errors have on a graph?
They increase the scatter of points about the line of best fit
They change the gradient of the line
They move the line up or down (changing the intercept on the y-axis)
What effect do systematic errors have on a graph? (pick 2).
They can increase the scatter of points about the line of best fit
They can move the graph up or down, changing the y-intercept without changing the gradient
They can cause the gradient to change
An accurate measurement is...?
Close the the true (accepted) value
Very precise; instruments with small increments have been used to take the measurement
A measurement with very little spread about the mean value
A precise measurement is...?
Close the the true (accepted) value
Very precise; instruments with small increments have been used to take the measurement
A measurement with very little spread about the mean value
Repeatable measurements are...?
Measurements where similar results are obtained if a different experimenter carries out the measurements using a different method and/or equipment
Very precise; instruments with small increments have been used to take the measurements
A measurement with very little spread about the mean value
Measurements where the same results are obtained if the original experimenter repeats the measurements using the same equipment and method
Reproducible measurements are...?
Measurements where similar results are obtained if a different experimenter carries out the measurements using a different method and/or equipment
Very precise; instruments with small increments have been used to take the measurements
A measurement with very little spread about the mean value
Measurements where the same results are obtained if the original experimenter repeats the measurements using the same equipment and method
What is the resolution of a measuring instrument? Select 2
The smallest change in the quantity being measured that the instrument can detect
The smallest reading the instrument can take
The number of decimal places in each reading
The number of significant figures in each reading
A vector quantity has...(choose the best answer)?
Magnitude only
Direction only
Magnitude and direction
Size and angle
2 examples of vector quantities are...?
Force
Displacement
Distance
Mass
Time
What is a scalar quantity? (choose the best answer)
One that just tells you how big it is
One with magnitude only
One with direction only
One with magnitude and direction
Select 3 scalar quantities.
Distance
Displacement
Mass
Force
Power
How can vectors be subtracted from each other?
Subtracting a vector is the same as adding the vector mulplied by -1
It isn't possible to do graphically
Draw them nose-to-nose
