PHY 250L All Lab Quizes _Straighterline

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



The correct answer is: Uncertainty in Gravity


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