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Questions and Answers
Which model assumes electrons revolve around the atomic nucleus in discrete orbitals?
Which model assumes electrons revolve around the atomic nucleus in discrete orbitals?
- Newton’s atomic model
- Electrical atomic model
- Wave-mechanical model
- Bohr atomic model (correct)
In wave mechanics, what are electrons in an atom characterized by?
In wave mechanics, what are electrons in an atom characterized by?
- Sequence numbers
- Atomic numbers
- Periodic numbers
- Quantum numbers (correct)
Which concept in quantum mechanics limits each electron state to hold no more than two electrons with opposite spins?
Which concept in quantum mechanics limits each electron state to hold no more than two electrons with opposite spins?
- Valence electron principle
- Ground state principle
- Quantum efficiency principle
- Pauli exclusion principle (correct)
Which of the following is not a subshell according to quantum mechanics?
Which of the following is not a subshell according to quantum mechanics?
What element improves the machinability of steel?
What element improves the machinability of steel?
In pig iron, the carbon content typically ranges from:
In pig iron, the carbon content typically ranges from:
Which space lattice is found in alpha-iron?
Which space lattice is found in alpha-iron?
The essential property for spring materials is:
The essential property for spring materials is:
What is the name of the elements positioned in Group 0 of the periodic table, with filled electron shells and stable electron configurations?
What is the name of the elements positioned in Group 0 of the periodic table, with filled electron shells and stable electron configurations?
Which term describes elements that have the capability of giving up their few valence electrons to become positively charged ions?
Which term describes elements that have the capability of giving up their few valence electrons to become positively charged ions?
Which type of primary or chemical bond is found in solids?
Which type of primary or chemical bond is found in solids?
What is the term for the attractive bonding force between atoms?
What is the term for the attractive bonding force between atoms?
What is the term used when polymorphism is found in elemental solids?
What is the term used when polymorphism is found in elemental solids?
Which term refers to materials composed of many small crystals or grains in crystalline solids?
Which term refers to materials composed of many small crystals or grains in crystalline solids?
What term is used for non-crystalline solids that lack a systematic and regular arrangement of atoms?
What term is used for non-crystalline solids that lack a systematic and regular arrangement of atoms?
Which type of defect is a normally occupied point in a crystal lattice from which an atom is missing?
Which type of defect is a normally occupied point in a crystal lattice from which an atom is missing?
What is the stress in section A if the Young's modulus is 2.1x10^5 N/mm^2?
What is the stress in section A if the Young's modulus is 2.1x10^5 N/mm^2?
What force 'P' will cause a total length decrease of 0.25 mm in the member?
What force 'P' will cause a total length decrease of 0.25 mm in the member?
If the bar is subjected to a tensile load of 160kN, what is the stress limit in the middle portion?
If the bar is subjected to a tensile load of 160kN, what is the stress limit in the middle portion?
For a total elongation of 0.2 mm, what is the diameter and length of the middle portion of the bar?
For a total elongation of 0.2 mm, what is the diameter and length of the middle portion of the bar?
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