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PHY250L_ESL | Lab 1: Measurements and Uncertainty
Started on Thursday, April 30, 2020, 5:37 PM
State Finished
Completed on Thursday, April 30, 2020, 5:53 PM
Time taken 15 mins 49 secs
Grade 42.00 out of 42.00 (100%)
Question 1
A student is measuring a length of a screw and he observes the following readings:
Correct
Major scale: reading is in between 24mm and 25mm.
4.20 points out
of 4.20
Minor scale: 5th division coincides with one of the division in major scale and the least count of the instrument is
0.05mm.
What is the best estimate for the length of the screw?
Select one:
a. 24.25
b. 24.05 mm
c. 24.5 mm
d. 23.75 mm
The correct answer is: 24.25
Question 2
True/False: The least count of an instrument is the smallest graduation on its measurement scale.
Correct
4.20 points out Select one:
of 4.20 a. True
b. False
The correct answer is: True
Question 3
True/False: When performing a measurement, we must account for error and uncertainty.
Correct
4.20 points out Select one:
of 4.20 a. True
b. False
The correct answer is: True
,Question 4
A systematic error in measurement is a/an
Correct
4.20 points out Select one:
of 4.20 a. error in instrument set up
b. human error
c. error due to a large number of measurements
d. instrumental and human error
The correct answer is: error in instrument set up
Question 5
What is the best reason to use a spring scale when measuring weight?
Correct
4.20 points out Select one:
of 4.20 a. It is a simple to use and inexpensive
b. The accuracy does not change with repeated use
c. It is free from systematic errors.
d. It can be used anywhere without calibration
The correct answer is: It is a simple to use and inexpensive
Question 6
Which of the following will give you the most precise readings: A tape measure, a Ruler or a Vernier Caliper?
Correct
4.20 points out Select one:
of 4.20 a. Vernier Caliper
b. Ruler
c. Both Ruler and Caliper
d. Tape Measure
The correct answer is: Vernier Caliper
,Question 7
The uncertainty for the tape measure shown below is
Correct
4.20 points out
of 4.20
Select one:
a. ± 0.05cm
b. ± 0.1cm
c. ± 0.01cm
d. ± 0.5cm
The correct answer is: ± 0.05cm
Question 8
A vernier caliper works by using a
Correct
4.20 points out Select one:
of 4.20 a. Fixed major scale and movable minor scale
b. Fixed major and minor scales
c. Fixed minor scale and movable major scale
d. Movable major and minor scales
The correct answer is: Fixed major scale and movable minor scale
Question 9 True/False: In the stopwatch experiment, increasing the height from which the marbles are dropped will correspond
Correct with a reduction in random errors.
4.20 points out
of 4.20 Select one:
a. True
b. False
The correct answer is: True
, Question 10
In a density of mass experiment, which of the following uncertainties do NOT affect the end result?
Correct
4.20 points out Select one:
of 4.20 a. Uncertainty in Gravity
b. Uncertainty in Volume
c. Uncertainty in Height
d. Uncertainty in diameter
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