Free Printable Properties of Matter

1.

A cylindrical rod of cross-sectional area A experienced pressure P due to a compressive force F. If the force applied is reduced to one-third what happens to pressure?

a)

also reduced to one-third

b)

tripled

c)

remains the same

2.

The cause of elasticity of a substance is

a)

deformation

b)

large internal restoring force

c)

low internal restoring force

d)

less distance between the molecules

3.

Stress = ..............................

a)

$\frac{Forcce}{Volume}$

b)

$\frac{Force}{Length}$

c)

$\frac{Force}{Area}$

4.

What is the unit of stress?

a)

N/m²

b)

Nm²

c)

Pascals

d)

(N/M)^-2

5.

Which of the following is a correct definition for strain?

a)

It is the length divided by the original length.

b)

It is the extension divided by the length.

c)

It is the extension divided by the original length.

d)

It is the force divided by the cross-sectional area.

6.

What is the equation for Tensile Strain of a material?

a)

Force / Area

b)

Stress / Area

c)

Extension / Length

d)

F / A

7.

The equation for strain is...

a)

$\epsilon=\frac{F}{A}$

b)

$\epsilon=F\cdot A$

c)

$\epsilon=\frac{\Delta L}{L}$

d)

$\epsilon=\Delta L\cdot A$

8.

The unit for "Strain" is m².

a)

True

b)

False

9.

Young's modulus is a measure of

a)

Hardness

b)

Strength

c)

Stiffness

d)

Toughness

10.

Materials with a high value of Young’s modulus are

a)

stiffer

b)

weak

11.

Young’s modulus DOES NOT depend to the length of the wire, but it depends on the MATERIAL that made the wire.

a)

True

b)

False

12.

Unit of Young's modulus is .............

a)

Nm

b)

N/m²

c)

N

13.

Given the Young's modulus of elasticity below rank the metals according to the magnitude of tensile stress it can hold from highest to lowest.

Aluminum 69 GPa

Brass 125 GPa

Steel 200 GPa

a)

Aluminum, Brass, Steel

b)

Brass, Aluminum, Steel

c)

Steel, Brass, Aluminum

14.

This refers to the ratio of tensile stress to tensile strain.

a)

Bulk Modulus of elasticity

b)

Shear Modulus of Rigidity

c)

Young's Modulus of elasticity

15.

Young's modulus =

a)

$Stress\ \times\ Strain$

b)

$\frac{Stress}{Strain}$

c)

$\frac{Strain}{Stress}$

16.

Which of these is a formula for Young's modulus

a)

$Y=\frac{F}{A}\times\frac{\Delta L}{L}$

b)

$Y=\frac{F}{A}\times\frac{L}{\Delta L}$

c)

$Y=\frac{F}{L}\times\frac{A}{\Delta L}$

17.

Which is the correct equation to find the change in length of a cylindrical metal rod the experience a tensile stress?

a)

A

b)

B

c)

C

18.

Which of the following is a correct expression for the Young's modulus of a wire with a circular cross-section with diameter d? The original length, extension, and force are L, ΔL, and F, respectively.

a)

$\frac{FL}{\pi d^2\Delta L}$

b)

$\frac{4FL}{\pi d^2\Delta L}$

c)

$\frac{F\Delta L}{\pi d^2L}$

d)

$\frac{\pi d^2\Delta L}{4FL}$

19.

A nylon string, has a diameter of 2.00 mm, is pulled by a force of 100 N. Determine the stress.

a)

318 MPa

b)

31.8 MPa

c)

3.18 MPa

20.

A 1.00 m long cord is pulled by a force causing its length to change by 2.00 mm. Determine the strain.

a)

0.2

b)

0.02

c)

0.002

21.

A concrete has a height and unit area of 5.00 m and $3.00\ m^2$ respectively. If it supports a mass of $3.00\times10^4$ kg and its height changes by 0.0250 mm, what is the Young's modulus of this concrete?

a)

2.00 GPa

b)

19.6 GPa

c)

2.00 MPa

22.

The straight line graph (OA) obeys Hooke’s law which states ‘Below the proportionality limit, the restoring force, 𝐹_𝑠 is INVERSELY proportional to the extension, 𝐹_𝑠=−𝑘𝑥, where 𝑥 is the amount of extension.

a)

True

b)

False

23.

What happened at point D?

a)

The change in the internal structure of the material.

b)

The force (stress) on the material is maximum and is known as the breaking force (stress).

c)

This is the point where the material breaks or fractures.

24.

The limit beyond which the material does not behave elastically is known as

a)

Proportional limit

b)

Plastic limit

c)

Elastic limit

d)

Yield Point

25.

Which point on the graph best describes the yield point of this material?

a)

A

b)

B

c)

D

d)

E

26.

What happens at the Yield point?

a)

solid material that is being stretched begins to change shape permanently

b)

material begins to elastically deform

c)

Material is under high compressive forces and shrinks

27.

What is the definition of tensile strength

a)

Resistance to localized plastic deformation induced by either mechanical indentation or abrasion.

b)

The external force acting on an object or surface parallel to the slope or plane in which it lies

c)

Maximum load that a material can support without fracture when being stretched.

28.

Plastic deformation occurs when a material is deformed beyond its elastic limit.

a)

True

b)

False

Properties of Matter

Total questions: 28

Worksheet time: 1hrs 23mins

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