Solids XI Flashcards
(26 cards)
What is the definition of stress in the context of mechanical properties of solids?
Stress is defined as the force applied per unit area on an object.
True or False: Strain is a dimensionless quantity.
True
Fill in the blank: The ratio of stress to strain in the elastic region is known as _____.
Young’s modulus
What is the unit of Young’s modulus?
Pascals (Pa)
Multiple Choice: Which of the following is a type of stress? A) Tensile B) Compressive C) Shear D) All of the above
D) All of the above
What does Hooke’s Law state?
Hooke’s Law states that the strain in a solid is directly proportional to the applied stress within the elastic limit.
True or False: The elastic limit is the maximum stress that a material can withstand without permanent deformation.
True
Fill in the blank: The property of a material that allows it to return to its original shape after deformation is called _____.
Elasticity
What is the main difference between elastic and plastic deformation?
Elastic deformation is reversible, while plastic deformation is permanent.
Multiple Choice: Which of the following materials is most likely to exhibit plastic deformation? A) Rubber B) Steel C) Glass D) Wood
B) Steel
What is shear stress?
Shear stress is the force per unit area acting parallel to the surface of a material.
True or False: Ductility is the ability of a material to undergo significant plastic deformation before rupture.
True
Fill in the blank: The measure of a material’s resistance to deformation is called _____.
Stiffness
What is the formula for calculating tensile stress?
Tensile stress = Force / Cross-sectional area
Multiple Choice: Which of the following describes a brittle material? A) Capable of large deformations B) Breaks easily C) High ductility D) None of the above
B) Breaks easily
What is the significance of the yield point in stress-strain curves?
The yield point indicates the limit of elastic behavior and the beginning of plastic deformation.
True or False: The area under the stress-strain curve represents the toughness of the material.
True
Fill in the blank: The maximum stress a material can withstand before failure is known as _____ strength.
Ultimate
What is the difference between tensile strength and yield strength?
Tensile strength is the maximum stress a material can endure, while yield strength is the stress at which it begins to deform plastically.
Multiple Choice: Which of the following materials is considered ductile? A) Cast iron B) Aluminum C) Ceramics D) Concrete
B) Aluminum
What is the formula for calculating strain?
Strain = Change in length / Original length
True or False: The modulus of resilience is the amount of energy per unit volume that a material can absorb without permanent deformation.
True
Fill in the blank: The phenomenon where a material deforms under constant stress over time is known as _____.
Creep
What is the primary factor that affects the mechanical properties of solids?
The atomic structure and bonding of the material.
