PLTW Unit 3 Test Questions with Correct Answers
When converting from feet to inches, what is the correct conversion factor? - Answer-12"/1'
In most cases, the number of significant digits in a measurement should ____________ after a conversion. - Answer-remain the same
Tape measures and ya...
When converting from feet to inches, what is the correct conversion factor? - Answer-
12"/1'
In most cases, the number of significant digits in a measurement should ____________
after a conversion. - Answer-remain the same
Tape measures and yard sticks usually measure in feet and inches.(t/f) - Answer-true
Conversion factors are always equal to one.(t/f) - Answer-true
The US Customary System and British Imperial System are the same exact systems
with different names.(t/f) - Answer-false
In order for a measurement to be considered accurate, the degree of closeness to the
actual value must be high.(t/f) - Answer-true
US Customary System measurements do not always include units.(t/f) - Answer-false
How many inches are on a typical ruler? - Answer-12
How many increments within one inch exist on a typical ruler? - Answer-16
For decimal scaled instruments, record all digits that you can certainly determine from
the scale markings and estimate ________________ more digit.
1
2
3
4
5 - Answer-1
How many centimeters are included on a typical metric scale? - Answer-30
When using a digital instrument, zeros after the decimal do not need to be recorded.(t/f)
- Answer-false
If a vehicle has a fuel efficiency rating of 45 miles per gallon (mpg), what is the rating in
kilometers per liter (kpl) rounded to the nearest whole number? - Answer-19kml
What is the conversion factor between inches and centimeters? - Answer-1in=2.54
, According to the Emprical Rule for normal distributions, almost all data will fall within 4
standard deviations of the mean.(t/f) - Answer-false
____________% of the observations fall within 1 standard deviation of the mean. -
Answer-68
____________% of the observations fall within 2 standard deviations of the mean. -
Answer-95
____________% of the observations fall within 3 standard deviations of the mean. -
Answer-99.7
The Empirical Rule may be used on both normal and non-normal distributions.(t/f) -
Answer-false
In SI Units, prefixes indicate powers of ____________. - Answer-10
Convert 106.5 cm to meters. - Answer-1.065
If the precision of a measurement is crucial, it is always important to check.(t/f) -
Answer-true
A measurement always includes a value, units, and uncertainty.(T/F) - Answer-True
Random errors are errors that consistently cause measurement value to be too large or
too small.(T/F) - Answer-False
A definitive method to indicate uncertainty is to use plus/minus notation. (T/F) - Answer-
True
Poor precision results from procedural or equipment flaws.(T/F) - Answer-False
Poor precision is associated with random error.(T/F) - Answer-True
The accuracy of a measurement is related to the ____________ between the
measurement value and the accepted value. - Answer-Error
A block whose length is precisely and accurately known is known as a(n)
____________. This block is used as a standard which means a basis of comparison. -
Answer-gauge block
Dial calipers can be used to measure everything except:
Inside/Outside Diameter
Step Distance
Hole Depth
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