Question :
2.1 Multiple Choice
1) Which statement contains an exact number?
A) A : 1282451
2.1 Multiple Choice
1) Which statement contains an exact number?
A) A gross of paper contains 144 sheets.
B) One sheet of paper is 0.0042 inches thick.
C) One sheet of paper measures 8.5 x 11 inches.
D) A ream of medium weight paper weighs 20 pounds.
2) Which of the following is an inexact number?
A) There are 12 eggs in a dozen.
B) The conversion 1000 mm = 1 m.
C) This card measures 3.1 inches x 4.2 inches.
D) There are 2 cups in one pint.
3) A lab technician was assigned the task of determining the density of a sample of blood plasma. The technician performed three replicate measurements of the density of the sample and reported the following results.
0.810 g/mL1.375 g/mL2.046 g/mL
The actual density of blood plasma is 1.027 g/mL. In evaluating the technician’s job performance in terms of accuracy and precision, it can be said that the technician ________.
A) was neither accurate nor precise
B) was both accurate and precise
C) was accurate but not precise
D) was precise but not accurate
4) Which of the following contain three significant figures?
I. 326.0II. 0.00310III. 46,900IV. 1.070V. 0.020
A) II, III and V
B) II and III
C) IV and V
D) I, III and IV
5) A lab technician was assigned the task of determining the pH of a sample of blood. The technician performed three replicate measurements of the pH and reported the following results.
pH = 6.98pH = 6.99pH = 6.98
The actual pH of blood is 7.40. In evaluating the technician’s job performance in terms of accuracy and precision, it can be said that the technician ________.
A) was neither accurate nor precise
B) was both accurate and precise
C) was accurate but not precise
D) was precise but not accurate
6) If the accepted value for the length of an object is 6.78 cm, which of the following sets of experimental results is best described as both precise and accurate?
A) 6.78 cm, 6.38 cm, 6.48 cm (average = 6.55 cm)
B) 6.79 cm, 6.78 cm, 6.77 cm (average = 6.78 cm)
C) 6.71 cm, 6.71 cm, 6.72 cm (average = 6.71 cm)
D) 6.88 cm, 6.88 cm, 6.58 cm (average = 6.78 cm)
7) Which of the following sources of experimental error would properly be classified as a systematic error?
A) momentary changes in air currents within the instrument room
B) accidental miscalibration of the instrument being used
C) variances in the angle from which the instrument scale is read
D) momentary changes in the temperature of the instrument room
8) Which of the following sources of experimental error can be classified as random error?
A) The balance was not properly zeroed before weighing each sample.
B) The temperature in the room is not consistent.
C) The pipet used to measure a sample was not calibrated properly.
D) None of the above
9) Which measurement is consistent with a graduated cylinder which has an uncertainty of 0.1 mL?
A) 21.14 mL
B) 21 mL
C) 21.1 mL
D) 21.140 mL
10) Which device below is the most accurate for measuring volume?
A) a beaker calibrated in 1 milliliter units
B) a graduated cylinder calibrated in 0.5 milliliter units
C) a graduated pipet calibrated in 0.1 milliliter units
D) a buret calibrated in 0.02 milliliter units
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