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Edexcel | Physics WPH0 | W 13 6 1 | 1 hour 30 minutes

QP PDF

MS PDF

Q1
Q2
Q3
Q4

1

A student is asked to determine the density of a metal in the form of a thin sheet.

The sheet is a square of approximately 300 mm × 300 mm and has a thickness of about

0.01 mm.

1

(a) (I)

1 Mark

Explain why a metre rule is suitable to measure the length of each side of the

sheet.

Precision is 1mm giving a small %U

Or Precision is 1mm giving a %U of 0.3%

1

(a) (II)

1 Mark

Describe how the student should use this rule to make the measurements as

accurate as possible.

Take repeat readings (for both dimensions) and average

Or Appropriate use of set square

1

(b)

In order to determine the thickness, the student is told to fold the sheet in half five

times.

1

(b) (I)

2 Mark s

Explain why this technique would make the value for the thickness of the sheet

more precise.

Max 2

(By measuring 32) the mean value of thickness is obtained

(Measuring a larger thickness) gives a smaller %U

Since thickness is now greater and instrument precision is the same

Enables at least 2 SF measurement since thickness is now greater than

0.1mm

(Do not credit precision or accuracy alone or 3SF )

1

(b) (II)

1 Mark

State what instrument the student should use to measure the thickness of the

folded sheet.

Micrometer (screw gauge) Or digital (vernier) callipers

(not vernier callipers)

1

(c)

The student makes the following measurements.

1

(c) (I)

2 Mark s

The folded sheet is 32 times thicker than a single sheet.

Use these measurements to show that the volume of the sheet is about

1

(c) (II)

2 Mark s

Use the measurements to estimate the percentage uncertainty in the volume.

Percentage uncertainty =

Uses half ranges (or ranges) Or adds 3 % uncertainties

To get between 5% - 6% (10% - 12%)

Example of calculation

[(4/301) + (3/300) + (12/369)] × 100% = 1.3% + 1.0% + 3.3% = 5.6%

1

(c) (III)

1 Mark

The student measures the mass of the sheet as 2.49 g with negligible uncertainty.

Calculate the density of the metal.

Density =

1

(c) (IV)

2 Mark s

Use your calculations to determine whether the sheet might be made from

aluminium.

Calculates %D

Comment based on comparison with %U

Or

Calculates maximum density value

Compares this value with actual value

Example of calculation

[(2750 – 2390)/2750] × 100% = 13%

%D (significantly) > %U so foil probably not pure aluminium

Q1
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