Question 10 A student carries out a series of determinations of the acceleration of free fall g. The table shows the results. g / m s⁻² 4.91 4.89 4.88 4.90 4.93 4.92 What can be said about this experiment?

D it is not accurate but is precise

B it is accurate but not precise

C it is not accurate and not precise

Question 11 The measurement of a physical quantity may be subject to random errors and systematic errors. Which statement is correct?

A random errors can be reduced by taking the average of several measurements

B random errors are always caused by the person taking the measurement

C a systematic error cannot be reduced by adjusting the apparatus

D a systematic error results in a di erent reading each time the measurement is taken

Question 14 Which experimental technique reduces the systematic error of the quantity being investigated?

A adjusting an ammeter to remove its zero error before measuring a current

B measuring several internodal distances on a standing wave to find the mean internodal distance

C measuring the diameter of a wire repeatedly and calculating the average

D timing a large number of oscillations to find a period

Question 16 The Young modulus of the material of a wire is to be found. The Young modulus E is given by the equation below. E = 4Fl /πd ² x The wire is extended by a known force and the following measurements are made. Which measurement has the largest effect on the uncertainty in the value of the calculated Young modulus? measurement symbol value

B diameter of wire d 0.54 ± 0.02 mm

A length of wire before force applied l 2.043 ∓ 0.002 m

C force applied F 19.62 ± 0.01 N

D extension of wire with force applied x 5.2 ± 0.2 mm

Question 24 In an experiment to determine the acceleration of free fall g, a ball bearing is held by an electromagnet. When the current to the electromagnet is switched off , a clock starts and the ball bearing falls. After falling a distance h, the ball bearing strikes a switch to stop the clock which measures the time t of the fall. If systematic errors cause t and h to be measured incorrectly, which error must cause g to appear greater than 9.81 m s⁻² ?

D h is measured correctly and t measured as being smaller than it actually is

A h measured as being smaller than it actually is and t is measured correctly

B h measured as being smaller than it actually is and t measured as being larger than it actually is

C h measured as being larger than it actually is and t measured as being larger than it actually is

Question 30 A mass is dropped from rest and falls through a distance of 2.0 m in a vacuum. An observer records the time taken for the mass to fall through this distance using a manually operated stopwatch and repeats the measurements a further two times. The average result of these measured times, displayed in the table below, was used to determine a value for the acceleration of free fall. This was calculated to be 9.8 m s⁻². 1st measurement 2nd measure 3rd measure Average Time/ s 0.6 0.73 0.59 0.64 Which statement best relates to the experiment?

B The measurements are not accurate and not always recorded to the degree of precision of the measuring device but the calculated experimental result is accurate.

A The measurements are precise and accurate with no evidence of random errors.

C The measurements are not always recorded to the degree of precision of the measuring device but are accurate. Systematic errors may be present.

D The range of results shows that there were random errors made but the calculated value is correct so the experiment was successful.

AS 1.2 Measurements & Errors

Authored by Mr. Santanu Kumar Sahoo

Physics

11th Grade

Used 1+ times

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Question 1 The density of the material of a coil of thin wire is to be found. Which set of instruments could be used to do this most accurately?

A Metre rule, protractor, spring balance

B Micrometer, metre rule, top-pan balance

C Stopwatch, newton-meter, vernier calipers

D Tape measure, vernier calipers, lever balance

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Question 2 The diagram shows part of a thermometer. What is the correct reading on the thermometer and the uncertainty in this reading?

A 24 ∓ 1

B 24 ∓ 0.1

C 24.0 ∓ 0.2

D 24.0 ∓ 0.5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Question 3 In an experiment to determine the acceleration of free fall using a falling body, what would lead to a value that is too large?

A air resistance

B dimensions of the body are too large

C measured distance longer than true distance

D measure time longer than true-time

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Question 4 The diagram shows the stem of a Celsius thermometer marked to show initial and final temperature values. What is the temperature change expressed to an appropriate number of significant figures?

A 14⁰ C

B 20.5⁰ C

C 21⁰ C

D 22⁰ C

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Question 5 A metre rule is used to measure the length of a piece of wire. It is found to be 70 cm long to the nearest millimetre. How should this result be recorded in a table of results?

A 0.7 m

B 0.70 m

C 0.700 m

D 0.7000 m

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Question 6 The diagrams show digital voltmeter and analogue ammeter readings from a circuit in which electrical heating is occurring. What is the electrical power of the heater?

A 0.53 W

B 0.58 W

C 530 W

D 580 W

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Question 7 An experiment is done to measure the acceleration of free fall of a body from rest. Which measurements are needed?

A The height of fall and the time of fall

B The height of fall and the weight of the body

C The mass of the body and the height of fall

D The mass of the body and the time of fall

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AS 1.2 Measurements & Errors

Question 1 The density of the material of a coil of thin wire is to be found. Which set of instruments could be used to do this most accurately?

Question 2 The diagram shows part of a thermometer. What is the correct reading on the thermometer and the uncertainty in this reading?

Question 3 In an experiment to determine the acceleration of free fall using a falling body, what would lead to a value that is too large?

Question 4 The diagram shows the stem of a Celsius thermometer marked to show initial and final temperature values. What is the temperature change expressed to an appropriate number of significant figures?

Question 5 A metre rule is used to measure the length of a piece of wire. It is found to be 70 cm long to the nearest millimetre. How should this result be recorded in a table of results?

Question 6 The diagrams show digital voltmeter and analogue ammeter readings from a circuit in which electrical heating is occurring. What is the electrical power of the heater?

Question 7 An experiment is done to measure the acceleration of free fall of a body from rest. Which measurements are needed?

Question 8 A micrometer is used to measure the diameters of two cylinders diameter of first cylinder = 12.78 ± 0.02 mm diameter of second cylinder = 16.24 ± 0.03 mm The difference in the diameters is calculated. What is the uncertainty in this difference?

Question 9 What is the reading shown on this milliammeter?

Question 10 A student carries out a series of determinations of the acceleration of free fall g. The table shows the results. g / m s⁻² 4.91 4.89 4.88 4.90 4.93 4.92 What can be said about this experiment?

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