
UNCERTAINTY ANALYSIS
Quiz
•
Physics
•
11th - 12th Grade
•
Hard
Gajendra Sethi
Used 1+ times
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35 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A digital balance is used to weigh ingredients in a laboratory. When a weight is applied to the digital balance, an electronic circuit generates a current which is then converted into a digital readout on the display.
The electronic circuit gives a current of 2.0mA when a weight of 30N is applied, and a current of 0.5 mA when a weight of 5 N is applied.
Which calibration curve could represent this circuit?
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Four students measure a time interval that is known to be 1.734 s.The measurement recorded by each student is shown.Which measurement is the most accurate?
1 s
1.7 s
1.83 s
1.604 s
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The power P dissipated in a resistor of resistance R is calculated using the expression P = V2/R
where V is the potential difference (p.d.) across the resistor. The percentage uncertainty in V is 5% and in R is 2%.
What is the percentage uncertainty in P ?
3%
7%
8%
12%
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which experimental technique reduces the systematic error of the quantity being investigated?
adjusting an ammeter to remove its zero error before measuring a current
measuring several internodal distances on a standing wave to find the mean internodal distance
measuring the diameter of a wire repeatedly and calculating the average
timing a large number of oscillations to find a period
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A student makes measurements from which she calculates the speed of sound as 327.66 m s–1.
She estimates that her result is accurate to ±3 %.
Which of the following gives her result expressed to the appropriate number of significant figures?
327.7 m s–1
328 m s–1
330 m s–1
300 m s–1
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In a simple electrical circuit, the current in a resistor is measured as (2.50 ± 0.05) mA. The resistor is marked as having a value of 4.7Ω ± 2 %.
If these values were used to calculate the power dissipated in the resistor, what would be the percentage uncertainty in the value obtained?
2 %
4 %
6 %
8 %
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A student uses a digital ammeter to measure a current. The reading of the ammeter is found to fluctuate between 1.98A and 2.02A.
The manufacturer of the ammeter states that any reading has a systematic uncertainty of ±1%.
Which value of current should be quoted by the student?
(2.00 ± 0.01)A
(2.00 ± 0.02)A
(2.00 ± 0.03)A
(2.00 ± 0.04)A
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