Materials Random Retrieval

This quiz contains all the questions in the Materials section. The website will pick 10 questions at random.

1 / 10

The ship, Queen Elizabeth 2, was a cruise ship from 1969-2008. She currently resides in Mina Rashid, Dubai as a floating hotel. When fully laden she held 70,327 tonnes and therefore displaces that weight of fluid when afloat. If the the density of seawater is 1024 kgm^-3, calculate the upthrust exerted on the ship when she was afloat fully laden. g = 9.81 NKg^-1

6.7x10⁵ N

6.9x10⁸ N

7.1x10⁸ N

7.1x10¹¹ N

2 / 10

When the temperature increases, what is the effect on fluids' viscosities?

Gases become less viscous, liquids become more viscous.

Gases become more viscous, liquids become less viscous.

Gases and liquids become less viscous.

Gases and liquids become more viscous.

3 / 10

What conditions are required for Stokes's law to apply?

Spheres at low speed flow.

Spheres at high speed flow.

Cubes at low speed flow.

Cube at high speed flow.

4 / 10

A copper wire of diameter 0.6 mm, X, is joined in series to the end of another copper wire of diameter 0.125 mm, Y. Both wires are 80 cm in length when no load is applied. A 15 N load is hung on the end of the wires as shown in the diagram below. If the Young's Modulus of copper is 128 GPa, calculate the extension for each wire.

ExtensionX = 0.3 mm, ExtensionY = 7.6 mm

ExtensionX = 0.4 mm, ExtensionY = 9.5 mm

ExtensionX = 1.4 mm, ExtensionY = 1.6 mm

ExtensionX = 2.3 mm, ExtensionY = 11.9 mm

5 / 10

What is the units for Young's modulus in terms of SI units?

kg m^-2

kgm^-1s^-1

kgm^-1s^-2

kgm^-2s^-3

6 / 10

What is Young's modulus a measure of?

The ductility of a material.

The tensile strength of a material.

The stiffness of a material.

The brittleness of a material.

7 / 10

A new material is developed and the research team want to know the amount of elastic strain energy it can store. They test the material multiple times and plot a graph with the averages. Estimate from the graph the elastic strain energy that is stored in the wire up to the limit of proportionality.

4.0 J

5.85 J

6.75 J

11.7 J

8 / 10

A wire has a diameter of d and a when a force of F is applied, it breaks at σ. What would the value of σ be if the diameter was halved?

^F/₂

^4F/_A

^F/_2A

^AF/₂

9 / 10

The graph above shows a fishing wire being extended by adding masses. Use the graph to estimate the elastic strain energy of the material.

9.7 J

10.0 J

19.4 J

32.3 J

10 / 10

Under a 4 N force, two identical springs, in parallel, stretch 130 mm. Calculate the spring constant for one of the springs.

7.7 Nm^-1

15.4 Nm^-1

30.7 Nm^-1

61.5 Nm^-1

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