Uncertainty in Measurement
MULTIPLE CHOICE QUESTION (30 secs)
Which of the following best describes uncertainty in measurement?
A. A mistake made by the measurer
B. The possible range within which the true value lies
C. The exact value of a measurement
D. The smallest unit on a measuring tool
B. The possible range within which the true value lies
MULTIPLE CHOICE QUESTION (30 sec)
How many significant figures are in 0.00450?
A. 2
B. 3
C. 4
D. 5
B. 3
MULTIPLE CHOICE QUESTION (30 sec)
What is the correct conversion factor for 1 hour to minutes?
A. 1 hr / 60 min
B. 60 min / 1 hr
C. 1 min / 60 hr
D. 60 hr / 1 min
B. 60 min / 1 hr
MULTIPLE CHOICE QUESTION (30 sec)
Which is the correct conversion for 2 km to meters?
A. 20 m
B. 200 m
C. 2000 m
D. 0.002 m
C. 2000 m
TRUE or FALSE (30 secs)
Measuring the same object multiple times can help reduce uncertainty
TRUE
MULTIPLE CHOICE QUESTION (30 sec)
Round 45.678 to 3 significant figures.
A. 45.6
B. 45.7
C. 45.68
D. 46.0
B. 45.7
FILL IN THE BLANKS (30 sec)
5 meters = ___ centimeters.
500 cm
MULTIPLE CHOICE QUESTION (30 sec)
How many seconds is 3 hours?
A. 1,080 s
B. 10,800 s
C. 108,000 s
D. 1,008 s
B. 10,800 s
COMPUTATION (1 min)
A student measures a block's length as 12.34 cm, but the actual length is 12.50 cm. Find the percent error.
1.280%
COMPUTATION (45 sec)
Multiply 3.25 × 1.4. Give your answer with correct significant figures.
4.6
COMPUTATION (1 min)
Direction: Show the complete solution and write the final answer in correct significant figures.
Convert 2.5 km to centimeters.
250,000 cm
COMPUTATION (1 min)
Direction: Show the complete solution and write the final answer in correct significant figures.
Convert 72 km/h to m/s.
20 m/s
COMPUTATION (2 mins)
A chemistry student measured the mass of a sample three times and got the following values: 23.45 g, 23.52 g, and 23.50 g. What is the absolute deviation of each measurement?
0.03000 g
COMPUTATION (45 sec)
Divide 567.8 ÷ 0.034. Give your answer in correct significant figures.
17,000
COMPUTATION (2 min)
Direction: Show the complete solution and write the final answer in correct significant figures.
An engineer measures a road length of 15 miles for a project. How many kilometers is this if 1 mile=1.609 km?
24 km
COMPUTATION (2 min)
Direction: Show the complete solution and write the final answer in correct significant figures.
A doctor prescribes a patient 0.005 liters of a liquid antibiotic. The nurse needs to prepare the exact dose in milliliters using a measuring cup marked in mL. How many milliliters should the nurse pour?
5 mL
COMPUTATION (2 mins)
A lab thermometer reads 98.6°C, but the actual temperature is 100.0°C. Calculate the percent error and absolute deviation if another reading were 99.4°C.
% error = 1.4 %
AD = 0.4 °C
COMPUTATION (2 mins)
A chemist is studying a rare type of molecule. In one sample, each molecule has a mass of 3.15 × 10⁻²⁴ grams. If the sample contains 6.022 × 10²³ molecules, what is the total mass of the sample? Express your final answer using the correct number of significant figures.
1.90 g
COMPUTATION (2 min)
Direction: Show the complete solution and write the final answer in correct significant figures.
A pharmacist receives an order to prepare 3.75 liters of a saline solution for a hospital ward. However, the storage containers available can only hold 250 milliliters each. How many full containers can the pharmacist fill, and how much solution (in milliliters) will be left over?
15 containers, 0mL leftovers
COMPUTATION (1 min)
Direction: Show the complete solution and write the final answer in correct significant figures.
A small conveyor belt in a packaging factory moves at a speed of 1.2 meters per second (m/s). For a calibration test, the engineer needs the speed in centimeters per second (cm/s) and in millimeters per minute(mm/min).
120 cm/s
72000 mm/min