Ee 3903: Electronic Materials - Practice Quiz I

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  • 1/30 Questions

    Which of the following can NOT be determined from the Hall measurement? 

    • Carrier mobility
    • Carrier type
    • Carrier lifetime
    • Carrier concentration
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About This Quiz

This practice quiz has been created for the students taking Electronic Materials (EE 3903) course offered in Spring 2015 in the Department of Electrical Engineering at Kennesaw State University. The quiz aims to help self evaluate student's preparation on the understanding of the subject matter in an efficient way and does NOT contribute to the final grade.

Ee 3903: Electronic Materials - Practice Quiz I - Quiz

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  • 2. 

    Consider a CuZn antisite defect formed in a CZTS film. Here CuZn means –

    • A copper atom is replaced by a zinc atom

    • A zinc atom is replaced by a copper atom

    • Sulfur atoms replace both copper and zinc atoms

    • Tin atoms replace both copper and zinc atom

    Correct Answer
    A. A zinc atom is replaced by a copper atom
    Explanation
    In a CuZn antisite defect, a zinc atom is replaced by a copper atom. This means that in the CZTS film, there is a substitution of a copper atom for a zinc atom. This type of defect can occur due to the similar size and charge of copper and zinc atoms, allowing for their interchange in the crystal lattice.

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  • 3. 

    For a non-polar covalent bond between two atoms A and B, which of the following is true?

    • A is more electronegative than B

    • B is more electronegative than A

    • Both A and B have same electronegativity

    • Both A and B must be metals

    Correct Answer
    A. Both A and B have same electronegativity
    Explanation
    In a non-polar covalent bond, the two atoms share electrons equally because they have the same electronegativity. This means that neither atom is more electronegative than the other. The electronegativity of an atom determines its ability to attract electrons in a bond. Therefore, if both atoms have the same electronegativity, it indicates that they have an equal ability to attract electrons, resulting in a non-polar covalent bond.

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  • 4. 

    Si has the following crystal structure:

    • Simple Cubic

    • Face Centered Cubic

    • Body Centered Cubic

    • Diamond

    Correct Answer
    A. Diamond
    Explanation
    The given crystal structure, diamond, is a type of lattice structure in which each carbon atom is bonded to four other carbon atoms in a tetrahedral arrangement. This results in a highly symmetric and tightly packed structure. Diamond is known for its exceptional hardness and high refractive index, making it a valuable material for various industrial applications and jewelry.

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  • 5. 

    Edge Dislocation is a –

    • Zero dimensional defect

    • One dimensional defect

    • Two dimensional defect

    • Three dimensional defect

    Correct Answer
    A. One dimensional defect
    Explanation
    An edge dislocation is a type of crystal defect that occurs when an extra half-plane of atoms is inserted into a crystal lattice. This results in a region where the atomic arrangement is disrupted and creates a one-dimensional defect line along the edge of the extra half-plane. Therefore, an edge dislocation is considered a one-dimensional defect.

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  • 6. 

    In XRD pattern, we observe a peak when scattered X-rays from the atoms in the crystal –

    • Do not interfere at all

    • Are completely out of phase

    • Make constructive interference

    • Make destructive interference

    Correct Answer
    A. Make constructive interference
    Explanation
    In an XRD pattern, when scattered X-rays from the atoms in the crystal make constructive interference, it means that the waves are combining in a way that results in a peak. This occurs when the X-rays are in phase and their peaks and troughs align, amplifying the intensity of the scattered X-rays. This constructive interference pattern provides information about the arrangement of atoms in the crystal lattice and can be used to determine the crystal structure.

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  • 7. 

    Atomic number of Phosphorus is 15. The number of valence electrons in Phosphorus is –

    • 3

    • 4

    • 5

    • 6

    Correct Answer
    A. 5
    Explanation
    The atomic number of an element represents the number of protons in its nucleus. Phosphorus has an atomic number of 15, indicating that it has 15 protons. The number of valence electrons in an atom is equal to the number of electrons in its outermost energy level. In the case of Phosphorus, its electron configuration is 2-8-5, meaning it has 5 valence electrons.

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  • 8. 

    If the mean scattering time of electrons in a metal increases, then – 

    • Mobility increases

    • Drift velocity increases

    • Conductivity increases

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    If the mean scattering time of electrons in a metal increases, it means that the electrons spend more time between collisions. This leads to an increase in their mobility, as they have more time to move before being scattered. With increased mobility, the drift velocity of electrons also increases, as they can move faster in the presence of an electric field. Additionally, increased mean scattering time implies that there are fewer collisions, allowing the electrons to move more freely and enhancing the overall conductivity of the metal. Therefore, all of the above options are correct.

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  • 9. 

    A deep level impurity creates an electronic energy level at the following position –  

    • Within the bandgap and very close to the valence band

    • Within the bandgap and very close to the conduction band

    • Within the bandgap and away from both conduction and valence bands

    • Above the conduction band

    Correct Answer
    A. Within the bandgap and away from both conduction and valence bands
    Explanation
    A deep level impurity creates an electronic energy level within the bandgap but away from both the conduction and valence bands. This means that the impurity level is not close to either the valence band (where electrons are bound to atoms) or the conduction band (where electrons are free to move and conduct electricity). The impurity level being away from both bands suggests that it is neither donating nor accepting electrons, but rather creating a localized energy state within the bandgap.

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  • 10. 

    Which of the following information can be obtained by X-ray diffraction (XRD) analysis of a crystalline solid?

    • Lattice parameters

    • Residual Strain

    • Crystallinity

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    X-ray diffraction (XRD) analysis is a technique used to study the structure of crystalline solids. It involves shining X-rays onto a sample and analyzing the resulting diffraction pattern. From this analysis, various information about the crystalline solid can be obtained. Lattice parameters refer to the dimensions and arrangement of the crystal lattice, which can be determined by XRD. Residual strain, which is the strain that remains in a material after external forces have been removed, can also be measured using XRD. Additionally, XRD can provide information about the crystallinity of a sample, which refers to the degree of order and regularity in the crystal structure. Therefore, all of the given options can be obtained through XRD analysis.

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  • 11. 

    Grain boundary is a –

    • Point defect

    • Line defect

    • Surface/Plane defect

    • Volume defect

    Correct Answer
    A. Surface/Plane defect
    Explanation
    Grain boundary is a surface/plane defect because it refers to the interface between two grains in a polycrystalline material. It is a region where the crystal structure of one grain transitions to the crystal structure of another grain. This boundary is considered a defect because it disrupts the regular arrangement of atoms within the crystal lattice.

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  • 12. 

    With the increase in temperature, the concentration of vacancies in a crystalline solid –

    • Decreases

    • Increases

    • Remains constant

    • Increases till 300K and then decreases

    Correct Answer
    A. Increases
    Explanation
    As the temperature of a crystalline solid increases, the atoms gain more thermal energy and become more mobile. This increased mobility leads to an increase in the number of vacancies, which are empty spaces where atoms should be. However, at very high temperatures, the atoms become so energetic that they can overcome the energy barriers and fill in the vacancies, causing the concentration of vacancies to decrease. Therefore, the concentration of vacancies in a crystalline solid increases with temperature until a certain point (around 300K) and then decreases.

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  • 13. 

    Electrons in a crystal could be scattered by –

    • Atoms vibrating due to thermal energy

    • Impurity atoms present in the crystal

    • Defects present in the crystal

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    Electrons in a crystal can be scattered by various factors. Atoms in the crystal vibrate due to thermal energy, causing the electrons to scatter. Additionally, impurity atoms present in the crystal can also scatter the electrons. Furthermore, defects present in the crystal can also cause scattering of electrons. Therefore, all of the given options - atoms vibrating due to thermal energy, impurity atoms, and defects present in the crystal - can lead to the scattering of electrons.

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  • 14. 

    Hall voltage increases with the increase of – 

    • Applied magnetic field

    • Injected current

    • Hall coefficient

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    The Hall voltage is generated when a magnetic field is applied perpendicular to the direction of current flow in a conductor. The Hall voltage is directly proportional to the applied magnetic field, meaning that as the magnetic field increases, the Hall voltage also increases. Additionally, the Hall voltage is inversely proportional to the injected current, so as the current decreases, the Hall voltage increases. Finally, the Hall voltage is also influenced by the Hall coefficient, which is a material-specific property. Therefore, all of the given factors - the applied magnetic field, injected current, and Hall coefficient - affect the Hall voltage.

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  • 15. 

    Defects in a crystalline solid can influence:

    • Optical properties

    • Electronic properties

    • Mechanical properties

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    Defects in a crystalline solid can influence its optical properties by causing light to scatter or absorb differently. They can also affect the electronic properties by introducing energy levels within the band gap or altering the conductivity. Additionally, defects can impact the mechanical properties of a crystalline solid by reducing its strength, ductility, or hardness. Therefore, all of the mentioned properties can be influenced by defects in a crystalline solid.

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  • 16. 

    Which of the following material can achieve highest magnetization?

    • Paramagnetic

    • Ferrimagnetic

    • Ferromagnetic

    • Diamagnetic

    Correct Answer
    A. Ferromagnetic
    Explanation
    Ferromagnetic materials can achieve the highest magnetization because they have strong permanent magnetic moments that align in the same direction, resulting in a strong overall magnetic field. This alignment is due to the presence of unpaired electrons in the material, which allows for a high degree of magnetization. Paramagnetic materials also have unpaired electrons but their magnetic moments do not align as strongly as in ferromagnetic materials. Ferrimagnetic materials have a combination of aligned and anti-aligned magnetic moments, resulting in a weaker overall magnetization. Diamagnetic materials have all their electrons paired, resulting in a very weak magnetization.

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  • 17. 

    Maximum number of electrons allowed in the L Shell:  

    • 6

    • 2

    • 4

    • 8

    Correct Answer
    A. 8
    Explanation
    The L shell is the second shell in an atom and can hold a maximum of 8 electrons. Each shell has a specific capacity for electrons, with the first shell (K shell) holding a maximum of 2 electrons, and subsequent shells holding more. Therefore, the correct answer is 8.

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  • 18. 

    The 2nd ionization energy is:

    • Equal to the 1st ionization energy

    • Less than the 1st ionization energy

    • Higher than the 1st ionization energy

    • A universal constant for all elements

    Correct Answer
    A. Higher than the 1st ionization energy
    Explanation
    The second ionization energy refers to the energy required to remove a second electron from an atom or ion. It is generally higher than the first ionization energy because removing a second electron requires overcoming the increased electrostatic forces between the remaining electrons and the positively charged nucleus. This means that it takes more energy to remove a second electron compared to the first. Therefore, the correct answer is "Higher than the 1st ionization energy."

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  • 19. 
    What is the miller indices of the following crystal plane (shaded)? - ProProfs

    What is the miller indices of the following crystal plane (shaded)?

    • (111)

    • (001)

    • (100)

    • (010)

    Correct Answer
    A. (010)
    Explanation
    The Miller indices represent the orientation of a crystal plane in a crystal lattice. In this case, the shaded crystal plane can be described by the Miller indices (010). The first index (0) indicates that the plane does not intersect the x-axis, the second index (1) indicates that the plane intersects the y-axis at a unit distance, and the third index (0) indicates that the plane does not intersect the z-axis. Therefore, the correct answer is (010).

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  • 20. 

    Which of the following XRD characteristic signifies a higher degree of crystallinity? 

    • Broad peaks

    • Sharp peaks

    • Large number of closely spaced peaks

    • Showing only (100) and (111) peaks

    Correct Answer
    A. Sharp peaks
    Explanation
    Sharp peaks in XRD signify a higher degree of crystallinity. This is because sharp peaks indicate that the crystal lattice is highly ordered and the atoms are arranged in a regular pattern. On the other hand, broad peaks suggest a lower degree of crystallinity, indicating that the crystal lattice is less ordered and the atoms are arranged in a more random manner. Large number of closely spaced peaks also indicate a higher degree of crystallinity as it implies that there are multiple planes of atoms in the crystal structure. Showing only (100) and (111) peaks does not provide enough information to determine the degree of crystallinity.

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  • 21. 

    Screw dislocation is a – 

    • Zero dimensional defect

    • One dimensional defect

    • Two dimensional defect

    • Three dimensional defect

    Correct Answer
    A. One dimensional defect
    Explanation
    A screw dislocation is a type of linear defect that occurs in crystalline materials. It is characterized by a shear deformation along a single line, resulting in a spiral or helical motion of the crystal lattice. This defect only affects the material in one dimension, as it involves the movement of atoms along a specific line or axis. Therefore, the correct answer is "One dimensional defect."

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  • 22. 

    Two different polycrystalline materials A and B has grain size numbers of 3 and 5 respectively. Which of the following is true? 

    • A has relatively smaller grains

    • B has relatively larger grains

    • A has more grains per unit area

    • B has more grains per unit area

    Correct Answer
    A. B has more grains per unit area
    Explanation
    The grain size number is inversely proportional to the grain size, meaning that a smaller grain size number corresponds to a larger grain size. Therefore, material A with a grain size number of 3 has relatively larger grains compared to material B with a grain size number of 5. Since material B has larger grains, it will have fewer grains per unit area compared to material A. Therefore, the correct answer is that B has more grains per unit area.

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  • 23. 

    Which of the following is NOT correct for indirect bandgap semiconductors? 

    • CBM and VBM mismatch in the k-space

    • Ideal for optoelectronic devices (such as LEDs)

    • Recombination process is mediated by phonons

    • Recombination process is inefficient

    Correct Answer
    A. Ideal for optoelectronic devices (such as LEDs)
    Explanation
    Indirect bandgap semiconductors have a mismatch between the conduction band minimum (CBM) and valence band maximum (VBM) in the k-space. This means that electrons cannot easily transition between the two bands without the assistance of phonons. The recombination process in indirect bandgap semiconductors is mediated by phonons, making it less efficient compared to direct bandgap semiconductors. However, indirect bandgap semiconductors are not ideal for optoelectronic devices like LEDs because the inefficient recombination process leads to low emission efficiency.

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  • 24. 

    In a metal, as temperature is increased, mobility of the electrons – 

    • Increase

    • Decrease

    • Does not change

    • Increases from 0K-273K, then decreases

    Correct Answer
    A. Decrease
    Explanation
    As temperature increases in a metal, the mobility of the electrons decreases. This is because as the temperature rises, the atoms in the metal vibrate more vigorously, causing more collisions between the electrons and the atoms. These collisions impede the movement of the electrons, reducing their mobility. Therefore, as temperature increases, the ability of the electrons to move freely within the metal decreases.

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  • 25. 

    If frequency increases, the skin depth of a metal conductor – 

    • Increases

    • Decreases

    • Remains same

    • Rapidly increases

    Correct Answer
    A. Decreases
    Explanation
    When the frequency increases, the skin depth of a metal conductor decreases. Skin depth refers to the depth at which the current density is reduced to approximately 37% of its value at the surface of the conductor. As the frequency increases, the current tends to flow more towards the surface of the conductor, resulting in a decrease in the skin depth. This phenomenon is due to the skin effect, which causes higher frequency currents to concentrate near the surface of the conductor, reducing their penetration into the conductor's interior.

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  • 26. 

    In general, if the electrical conductivity of a metal A is higher than a metal B, which one of the following is true?

    • Metal B has higher thermal conductivity

    • Metal A has higher thermal conductivity

    • There is no relation between electrical & thermal conductivity of metals

    • Thermal conductivity of Metal A is exactly half of metal B

    Correct Answer
    A. Metal A has higher thermal conductivity
    Explanation
    The statement suggests that there is a relationship between electrical conductivity and thermal conductivity in metals. Specifically, if the electrical conductivity of metal A is higher than metal B, then metal A also has higher thermal conductivity. This implies that metals with better electrical conductivity also tend to have better thermal conductivity.

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  • 27. 

    Above the Curie temperature, a ferromagnetic material would behave like a –

    • Superconductor

    • Diamagnetic material

    • Antiferromagnetic material

    • Paramagnetic material

    Correct Answer
    A. Paramagnetic material
    Explanation
    Above the Curie temperature, a ferromagnetic material loses its magnetic properties and becomes paramagnetic. In the ferromagnetic state, the material has aligned magnetic domains which create a strong magnetic field. However, when the temperature exceeds the Curie temperature, the thermal energy disrupts the alignment of these domains, causing the material to lose its magnetization. In the paramagnetic state, the material still exhibits weak magnetic properties, but they are not as strong or ordered as in the ferromagnetic state.

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  • 28. 

    If the frequency of AC supply is 50 Hz, what would be the corresponding frequency of the humming noise in a power transformer?

    • 50 Hz

    • 60 Hz

    • 100 Hz

    • 25 Hz

    Correct Answer
    A. 100 Hz
    Explanation
    The humming noise in a power transformer is typically twice the frequency of the AC supply. Since the frequency of the AC supply is 50 Hz, the corresponding frequency of the humming noise would be 100 Hz.

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  • 29. 

    A soft ferromagnetic material must have which of the following property?

    • High Coercivity

    • Large area within the hysteresis loop

    • Low coercivity

    • Low remenance

    Correct Answer
    A. Low coercivity
    Explanation
    A soft ferromagnetic material must have low coercivity. Coercivity refers to the ability of a material to resist changes in its magnetization. In the case of soft ferromagnetic materials, they are easily magnetized and demagnetized with low applied magnetic fields. This low coercivity property allows for efficient and easy manipulation of the magnetic domains in the material, making it suitable for applications such as transformers, electric motors, and magnetic recording devices.

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  • 30. 

    Domain walls in a ferromagnetic material are formed in order to –

    • Increase magnetization

    • Increase saturation flux density

    • Decrease magnetostatic energy

    • Decrease hysteresis loss

    Correct Answer
    A. Decrease magnetostatic energy
    Explanation
    Domain walls in a ferromagnetic material are formed to decrease magnetostatic energy. In a ferromagnetic material, the magnetic domains have different orientations, causing a nonuniform distribution of magnetic field. This leads to a high magnetostatic energy, which is the energy associated with the interaction between these magnetic fields. By forming domain walls, the material can minimize this energy by allowing the domains to align in a more uniform manner. Therefore, the formation of domain walls decreases the magnetostatic energy in the material.

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  • Mar 17, 2023
    Quiz Edited by
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    Quiz Created by
    EE3903

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