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Measurement Uncertainty Quiz (OCR A)

Authored by Justin Palfreyman

Physics

11th Grade

Used 3+ times

Measurement Uncertainty Quiz (OCR A)
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20 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

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The dimensions of a cube are measured with vernier calipers. The measured length of each side is 30.0 mm.

If the vernier calipers can be read with an uncertainty of +/- 0.1 mm. What is the approximate percentage uncertainty in the value of the volume?

A) 4%

B) 3%

C) 0.3%

D) 1%

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

To find the resistivity of a semiconductor, a student makes the following measurements of a cylindrical rod of the material:

length = 25 ± 1 mm,

diameter = 5.0 ± 0.1 mm,

resistance = 68 ± 1 Ω.

The resistivity is calculated to be 53 mΩ·m. What is the uncertainty in this result?

A) ± 1 mΩ·m

B) ± 2 mΩ·m

C) ± 4 mΩ·m

D) ± 5 mΩ·m

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

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Two students carry out an experiment to determine the ratio of potential difference across two resistors R1 and R2 which are connected in series across a low voltage d.c. supply. The resistors have different values such that R2 = 10 R1.

The voltmeter used to take the readings gives a reading of 0.2V before any potential difference is applied.

Amy takes one measurement across each resistor and calculates the ratio as V1 / V2.

Matthew changes the supply voltage and takes a series of readings for V1 and V2. He then plots a graph of V1 against V2 and uses the gradient of his graph to determine V1 / V2.

Which of the following statements is true?

Amy's value for V1 / V2 will not be affected by the error.

Amy's value for V1 / V2 will be increased because of the error.

Matthew's value for V1 / V2 will not be affected by the error.

Matthew's value for V1 / V2 will be decreased because of the error.

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A digital camera records each image as 8 megapixels, with each pixel transferring 14 bits of information.

What is the minimum capacity for a memory card which could hold 120 images?

1.7 Mbyte

13 Mbyte

1.7 Gbyte

13 Gbyte

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

A child (mass m) sits on a car seat which is accelerating horizontally at 0.50g (where g is the acceleration of free fall).

What is the magnitude of the total force F exerted by the car seat on the child?

A) 0.50 mg

B) 1.0 mg

C) 1.1 mg

D) 1.5 mg

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

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Two metal spheres, A and B, are positively charged. Sphere A is fixed in position. Sphere B is suspended by an insulating thread from a point directly above the center of sphere A as shown in the diagram.

Sphere B has a weight of 0.50 mN. The size of the electrostatic repulsive force is 0.29 mN.

What angle, θ, does the thread suspending sphere B make to the vertical?

A) 0.66°

B) 1.0°

C) 30°

D) 60°

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

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Each diagram below shows three newton meters, in a two-dimensional arrangement, joined to demonstrate a system of three forces acting at a point. The readings represent the magnitudes of the forces. Which system of forces could be in equilibrium?

A

B

C

D

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