Deformation of solid

Multiple Choice

What is the correct unit for strain?

• Pa

• Nm^-2

• No unit

• Nm²

Multiple Select

Select all the correct units for stress.

• Pa

• Nm^-2

• Nm²

• No unit

Multiple Choice

Which letter is pointing to the elastic limit?

• A

• B

• C

• D

Multiple Choice

Which letter points to the section that shows elastic deformation?

• A

• B

• C

• D

Multiple Choice

Which letter points to the section that shows ductile deformation?

• A

• B

• C

• D

Multiple Choice

Which letter is pointing to where the material will break?

• A

• B

• C

• D

Multiple Choice

Which section reversible ?

• A

• B

• C

• D

Multiple Choice

If a material has a cross-sectional area of 5 square meters and subjected to a normal force of 20 N, which of the following is the normal stress?

• 4 Pa

• 25 Pa

• 0.4 Pa

• 15 Pa

Multiple Choice

The Young's Modulus is defined as...

• The gradient of a stress strain graph

• The energy required to stretch a material.

• Stress/Strain

• Force/Extension.

Multiple Choice

Tensile Strain is

• $$\frac{Increase\ in\ length}{original\ length}$$

• $$\frac{decrease\ in\ length}{original\ length}$$

• $$\frac{change\ in\ volume}{original\ volume}$$

• all of the answer

Multiple Choice

• X- Glass, Y- Copper, Z- Rubber

• X- Glass, Y- Rubber, Z- Copper

• X- Rubber, Y- Copper, Z- Glass

• X- Rubber, Y- Glass, Z- Copper

Multiple Choice

The total maximum mass of a lift and its load is 2500 kg. The maximum upwards acceleration of the lift is 22.0 m s^-2. What is the minimum tensile strength of the lift cable with cross-sectional area, 10×10^-4 m² ?

• 2.5 x 10⁷ N m^-2

• 3.0 x 10⁷ N m^-2

• 5.5 x 10⁷ N m^-2

• 8.0 x 10⁷ N m^-2

Multiple Choice

A steel wire of length 2 m and cross-sectional area 0.80 x 10^-6 m² has a Young modulus of 2.0 x 10¹¹ Pa. The upper end of the wire is fixed and a load of 4 N is tied at the other end. The extension in mm of the wire is

• 0.002

• 0.050

• 0.50

• 1.00

• 5.00

Multiple Choice

When a spring fixed at one end is pulled by a force of 8 N, the extension is 40 mm. Two such springs are joined in series and is pulled to produce a total extension of 40 mm. What is the strain energy in the springs?

• 0.04 J

• 0.08 J

• 0.16 J

• 0.32 J

Multiple Select

the picture shows the force–extension graphs for

four springs, A, B, C and D. State which of the four springs does obey

Hooke’s law.

• A

• B

• C

• D

Multiple Choice

A vertical wire fixed at one end is stretched by a load of 40 N at the lower end. The extension is 3 x 10^-3 m, the cross-sectional area of the wire is 2.0 x 10^-6 m², and the original length of the wire is 2.0 m. Assuming Hooke's law holds, the molecular potential energy in J of the stretched wire is

• 0.024

• 0.048

• 0.060

• 6.00