Elex-Villamor-1-Electricity-and-Magnetism
C
"A 100m long wire with a cross-sectional area A=10-3 m2 has a resistance of 10Ω. Determine the resistivity of the wire. A. 10-2 Ω-m B. 10-3 Ω-m C. 10-4 Ω-m D. 10-5 Ω-m "
D
"A 2nC point charge will produce what potential at 2m away? A. 4.0 Volts B. 6.0 Volts C. 7.5 Volts D. 9.0 Volts "
B
"A changing magnetic field A. produces an electric field B. induces potential C. produces a fluctuating electric field D. produces a steady electric field "
A
"A charged atom is also known as A. ion B. anion C. cation D. domain "
A
"A charged body in free space produces 10-V potential at a distance 25cn away. What will be the potential at 50cm away? A. 5.0 Volts B. 7.5 Volts C. 10.0 Volts D. 15.0 Volts "
D
"A combination of two charges, with equal charge magnitude but opposite signs. A. magnetic dipole B. static dipole C. dynamic dipole D. electric dipole "
D
"A commonly used model in predicting the atomic structure of a material. A. String model B. Wave model C. Particle model D. Bohr model "
B
"A factor that does not affect the resistance of the material. A. atomic structure B. mass C. length D. cross-sectional area "
B
"A force of 20 N is acting on a 10 Wb magnetic pole, calculate the intensity of the magnetic field? A. 0.5 N/Wb B. 2 N/Wb C. 10 N/Wb D. 20 N/Wb "
A
"A force which causes a substance to become a magnet. A. magnetizing force B. magnetomotive C. creative force D. electromagnetic force "
A
"A good conductor has how many valence electrons? A. 1 B. 2 C. 4 D. 8 "
D
"A law of nature makes certain materials tend to form combinations that will make them stable. How many electrons in the valence orbit are needed to give stability? A. 1 B. 2 C. 4 D. 8 "
A
"A magnetic flux of 25,000 maxwell in an area of 5 sqcm. results in flux density of A. 5,000 Gauss (G) B. 125,000 G C. 5,000 Tesla (T) D. 125,000 T "
D
"A magnetic flux of 500,000,000 lines is equivalent to A. 5 x 108 Maxwells B. 5 Weber C. 500 x 106 Maxwells D. all of the above "
C
"A material that contains an abundance of free carrier is called A. insulator B. semi-insulator C. conductor D. semiconductor "
C
"A natural magnet A. loadstone B. carbon C. lodestone D. magnesium "
C
"A negative ion results when an atom A. loss some of its inside electrons B. loss some of its valence electrons C. gains additional electron D. gains additional proton "
C
"A positive ion has A. excess of electrons B. excess of neutrons C. lack of electrons D. lack of protons "
D
"A solid, which has no defined crystal structure. A. Crystalline B. Non-crystalline C. Amorphous D. Non-crystalline or Amorphous "
A
"A structure for solids in which the position of atoms are predetermined A. Crystalline B. Polycrystalline C. Lattice D. Non-Crystalline "
C
"A substance having high retentivity is best suited in making A. an electromagnet B. a temporary magnet C. a permanent magnet D. two pole magnet "
A
"A substance that attracts pieces iron is known as A. magnet B. conductor C. ferrite D. superconductor "
D
"A wire has a resistance of 5Ω at room temperature and a temperature coefficient α=4x10-3/°C, calculate the wire resistance at 75°C. A. 8.925 Ω B. 7.925 Ω C. 6.925 Ω D. 6.050 Ω "
B
"Ability of a material to conduct magnetic flux through it refers to A. permittivity B. permeability C. reluctivity D. conductivity "
D
"An advantage of an electromagnet over a permanent magnet A. An electromagnet can be demagnetized B. An electromagnet is simpler C. An electromagnet is cheaper D. An electromagnet can be switched ON and OFF "
A
"An atom or group of atoms that carries a net electric charge is called A. ion B. anion C. cation D. domain "
D
"An electric charge produces a total electric field of 6 Coulombs, calculate the electric flux density in an area of one square meter (1m2). A. 1 C/m2 B. 2 C/m2 C. 4 C/m2 D. 6 C/m2 "
A
"An electrical insulator can be made a conductor by A. ionizing B. electroplating C. oxidizing D. metalization "
D
"An insulating element or material has capability of _________. A. conducting large current B. storing voltage C. storing high current D. preventing short circuit between two conducting wires "
A
"An isolated body under normal condition is always A. neutral B. positively charged C. negatively charged D. ionized "
D
"An isotope A. has a negative charge B. has a positive charge C. might have either positive or negative charge D. is neutral "
D
"Approximate diameter of a Hydrogen atom A. 1.1 x 10^-10 µµm B. 1.1 x 10^-10 µm C. 1.1 x 10^-10 mm D. 1.1 x 10^-10 m "
D
"Approximate diameter of an atom A. 10^-10 µµm B. 10^-10 µm C. 10^-10 mm D. 10^-10 m "
D
"Approximately, how many electrons that could equal to the mass of a single proton or neutron? A. 1,863 electrons B. 1,683 electrons C. 1,638 electrons D. 1,836 electrons "
C
"At/m is a unit of A. magnetic field B. reluctance C. magnetizing force D. magnetic power "
C
"Calculate the electric field intensity 10cm from a charge Q=5nC. A. 450 N/C B. 900 N/C C. 4.5 x 103 N/C D. 9.0 x 103 N/C "
B
"Calculate the flux density in Gauss (G) having a flux of 12,000 Mx through a perpendicular area of 6cm. A. 200 G B. 2,000 G C. 7,200 G D. 72,000 G "
B
"Calculate the permittivity of a material with relative permittivity of 5. A. 8.854 x 10-11 F/m B. 4.42 x 10-11 F/m C. 1/36π x 10-9 F/m D. 8.854 x 10-12 F/m "
C
"Calculate the total electric field at the surface of a sphere of radius r=1cm, and enclosing a net charge of 2μC. A. 0 (zero) B. 9 x 107 N/C C. 1.8 x 108 N/C D. infinite "
B
"Charge body at rest is said to exhibit electric field, which interacts with other bodies. The study of this phenomena is known as A. electricity B. electrostatics C. electromagnetism D. field interactions "
B
"Cobalt is an example of a _________ material. A. diamagnetic B. ferromagnetic C. paramagnetic D. magnetic "
D
"Copper atom has how many protons? A. 1 B. 4 C. 8 D. 29 "
D
"Cores of magnetic equipment use magnetic material which has A. very low permeability B. moderate permeability C. low permeability D. high permeability "
A
"Coulomb is the SI unit of charge, how about in cgs? A. Statcoulomb B. electron volt C. electron unit D. static unit "
B
"Determine the ampere-turns when a 10 V battery is connected across a solenoid having 100 turns and a resistance of 5 Ω. A. 50 At B. 200 At C. 100 At D. 1,000 At "
B
"Determine the force in Newton between 4μC charges separated by 0.1 meter in air. A. 1.44 N B. 14.4 N C. 144 N D. 1440 N "
A
"Determine the magnitude of the electric field inside a sphere that encloses a net charge of 2μC. A. 0 (zero) B. 9 x 107 N/C C. 1.8 x 108 N/C D. infinite "
B
"Determine which statement is true? A. The current carriers in conductors are protons. B. The current carriers in conductors are valence electrons. C. Valence and inner electrons are the carriers in conductors. D. Valence electrons are not the ones that become free electrons. "
C
"Dielectric is another name for A. conductor B. semiconductor C. insulator D. semi-insulator "
D
"Electric charge of neutron is the same as A. proton B. electron C. current D. atom "
B
"Electric field intensity is A. a scalar quantity B. a vector quantity C. an absolute value D. a relative value "
A
"Electric field intensity is measured in terms of A. Volts/meter B. Newtons/meter C. Watts/meter D. Amperes/meter "
B
"Electric flux density is a/an ________ quantity. A. scalar B. vector C. absolute D. relative "
A
"Electric flux is a/an ________ quantity. A. scalar B. vector C. absolute D. relative "
D
"Electric lines of force leave and enter the charge surface at what angle? A. 15° B. 30° C. 45° D. 90° "
D
"Electrical current is analogous to _________ in magnetic circuits. A. Ampere-turn B. Magnetomotive force C. Magnetizing force D. Flux "
C
"Electromagnet whose core is in the form of a close magnetic ring A. solenoid B. relay C. toroid D. circular "
A
"Electromotive force (emf) is induced whenever a conductor cuts magnetic flux A. Faraday's first law B. Faraday's second law C. Coulomb's first law D. Coulomb's second law "
D
"Electron is derived from the Greek name elektron which means A. huge B. tiny C. particle D. amber "
B
"Electron volt (eV) is a unit of A. power B. energy C. magnetic field D. magnetic force "
A
"Electrons at the conduction band are called A. free electrons B. valence electrons C. deep state electrons D. shallow state electrons "
B
"Electrons at the outermost shell are called A. free electrons B. valence electrons C. deep state electrons D. shallow state electrons "
C
"Find the charge in coulombs of dielectric that has a positive charge of 14.5 x 10 to the 18th power protons. A. 29 x 10 to the 16th Coulombs B. 14.5 x 10 to the 16th Coulombs C. 14.5 x 10 to the 18th Coulombs D. 29 x 10 to the 18th Coulombs "
A
"Find the dielectric constant of air. A. approximately 1 B. approximately 0 C. approximately 2 D. approximately 4 "
A
"From the combined energy-gap diagram, which material has the smallest energy gap between valence band and the conduction band? A. conductor B. semiconductor C. super conductor D. insulator "
D
"From the combined energy-gap diagram, which material has the widest gap between valence band and the conduction band? A. conductor B. semiconductor C. super conductor D. insulator "
B
"Gases with charged particles. A. inert B. plasma C. conductive D. reactive "
D
"Given an atomic structure of a certain material, what data can you determine out from it? A. atomic number B. atomic mass C. the number of protons and electrons D. all of the above "
C
"Group of magnetically aligned atoms. A. Lattice B. Crystal C. Domain D. Range "
B
"How does permittivity affect electric field intensity? A. It causes the field intensity to increase. B. It causes the field intensity to decrease. C. It causes the field intensity to fluctuate up and down. D. It has no effect on field intensity. "
A
"Hydrogen is an example of a _________ material. A. diamagnetic B. ferromagnetic C. paramagnetic D. magnetic "
A
"Ideally, all atoms have the same number of positively charged protons and negatively charged electrons, and is therefore considered as A. electrically neutral B. physically stable C. magnetically aligned D. technically rigid "
D
"If a conductor's cross-sectional area is doubled and its length is halved, the value of its resistance will A. double B. quadruple C. decrease by a factor of two D. decrease by a factor of four "
C
"If a magnetic flux occurs across 100 turns at a rate of 2 Wb/sec. What is the induced voltage as per Faraday's law? A. 100 V B. 400 V C. 200 V D. 800 V "
A
"If a wire coil has 100 turns and carries 1.3 A of current, calculate the magnetomotive force in Gilbert. A. 163.3 B. 16.33 C. 1.633 D. 0.1633 "
C
"If an element has an atomic number of 12, there are how many protons and electrons? A. 6 protons and 12 electrons B. 12 protons and 6 electrons C. 12 protons and 12 electrons D. 12 protons and 24 electrons "
C
"If in a material, current can hardly pass, it means A. the material is very hard B. the material is very soft C. the material has high resistance D. the material has less resistance "
D
"If the distance between two magnetic poles is halve, the force between them A. decreases two times B. decreases four times C. increases two times D. increases four times "
A
"If the electrical current carried by each of the two long parallel wire is doubled, and their separation is also doubled, the force between them A. also doubles B. increases by a factor of four C. decreases by a factor of four D. decreases by a factor of two "
A
"If the magnetic flux through a coil changes, the induced EMF acts in such a direction as to A. oppose that change B. magnify that change C. augment that change D. amplify that change "
B
"If two coils are close enough together for their magnetic fields to interact, a change in current in one will induce a corresponding voltage in the other, This condition is known as A. self-inductance B. mutual inductance C. crossfire inductance D. linked inductance "
D
"In 1784, who demonstrated that the force between charges is inversely related to the square of the distance between them? A. Maxwell B. Gauss C. Tesla D. Coulomb "
D
"In a magnet, the straight line passing through the two poles is called A. real axis B. imaginary axis C. Cartesian axis D. magnetic axis "
D
"In a magnet, what do you call the point in which the magnetic lines of force is maximum? A. maximum pole B. intensified pole C. unit pole D. magnetic pole "
D
"In a magnetic circuit, a flux that drifts away from its intended path is called A. lost flux B. linked flux C. drift flux D. leakage flux "
B
"In all cases of electromagnetic induction, the current set-up by an induced voltage tends to create flux whose direction opposes any change in the existing flux. This law is called A. Ampere's law B. Lenz' law C. Coulomb's law D. Faraday's law "
C
"In an atomic structure, what particle that has no charge and therefore has no effect on its atomic charge A. electrons B. protons C. neutrons D. nucleons "
A
"In electricity, positive electric charge refers to ____. A. Protons B. Neutrons C. Electrons D. Atoms "
D
"In electromagnetism, what law that determines the amount of induced voltage? A. Ampere's law B. Lenz' law C. Coulomb's law D. Faraday's law "
B
"In electromagnetism, what law that determines the polarity of an induced voltage? A. Ampere's law B. Lenz' law C. Coulomb's law D. Faraday's law "
D
"In materials, what do you call the region that separates the valence and conduction bands? A. energy gap B. forbidden band C. insulation band D. energy gap or forbidden band "
A
"In what direction is the magnetic field about a conductor when current is flowing? A. In a direction determined by the left-hand rule. B. Always in a clock wise direction. C. Always in a counter clockwise direction. D. In a direction determined by the right-hand screw rule. "
A
"Ion is __________. A. an atom with unbalanced charges B. free electron C. proton D. nucleus without protons "
D
"Is a process by which an atom is constantly losing and then regaining electrons? A. oxidation B. passivation C. metallization D. ionization "
D
"Is at the center of an atomic structure in a Bohr model A. Electrons B. Protons C. Neutrons D. Nucleus "
A
"Is believed to be the pole where the magnetic lines of force are originating. A. North Pole B. South Pole C. Unit Pole D. Universal Pole "
A
"Is the property of magnetic materials, which retain magnetism after the withdrawal of magnetizing force. A. retentivity B. permeability C. reluctivity D. susceptability "
D
"Is the quantity of magnetizing force needed to counter balance the residual magnetism of a magnetic material. A. hysteresis B. degaussing C. retentivity D. coercivity "
B
"Is the reciprocal of reluctance and implies the readiness of a material to develop magnetic flux. A. elastance B. permeance C. susceptance D. conductance "
D
"Is used to maintain strength of magnetic field. A. storer B. energizer C. gausser D. keeper "
D
"Is usually used to detect the presence of electric charge. A. experimental charge B. unit charge C. dipole D. test charge "
B
"Isotope means, the same element but with different number of A. electrons B. neutrons C. protons D. atoms "
D
"It is composed of a series of energy levels containing the valence electrons. A. conduction band B. forbidden band C. side band D. valence band "
D
"It is easier to establish flux line in soft iron than it is to establish them in air, this is because iron has a lower A. Permeance B. Inductance C. elastance D. reluctance "
C
"It is the specific reluctance of a material. A. resistivity B. retentivity C. reluctivity D. permeability "
A
"Known as the simplest type of atom. A. Hydrogen B. oxygen C. Helium D. Nitrogen "
B
"Magnetic circuit property that permits flux. A. elastance B. permeance C. susceptance D. conductance "
B
"Magnetic flux can always be attributed to A. static charged particles B. motion of charge particles C. static electric field D. every applied potential "
A
"Magnetic intensity is A. a vector quantity B. a scalar quantity C. an imaginary quantity D. either a vector or scalar "
C
"Magnetic lines of force are called A. magnetic field B. magnetic flux density C. magnetic flux D. electromagnetic field "
D
"Magnetomotive force has a unit of A. Volt (V) B. Watt (W) C. Joule (J) D. Ampere-turn (At) "
A
"Materials that can be easily magnetized in both directions A. soft magnetic materials B. hard magnetic materials C. diamagnetic D. paramagnetic "
B
"Materials that might have eight valence electrons A. conductor B. insulator C. semiconductor D. semi-insulator "
B
"Materials with permeability slightly greater than that of free space. A. diamagnetic B. paramagnetic C. ferromagnetic D. antimagnetic "
A
"Materials with permeability slightly less than that of free space. A. diamagnetic B. paramagnetic C. ferromagnetic D. antimagnetic "
A
"Maximum number of orbiting electrons at the first or K shell A. 2 B. 4 C. 6 D. 8 "
B
"Most materials' relative permittivity lies between A. 0.01 - 1 B. 1 - 10 C. 10 - 50 D. 50 - 100 "
B
"Nonmetallic materials that has ferromagnetic properties. A. termites B. ferrites C. ferrous D. loadstone "
B
"One Ampere-turn (At) is equivalent to A. 0.126 Gilbert B. 1.260 Gilberts C. 12.60 Gilberts D. 126 Gilberts "
A
"One Coulomb of charge has how many electrons? A. 6.24 x 1018 electrons B. 6.24 x 1019 electrons C. 62.4 x 1018 electrons D. 62.4 x 1019 electrons "
B
"One Gilbert is equal to A. 0.0796 At B. 0.796 At C. 7.96 At D. 79.6 At "
A
"One Weber is equivalent to A. 108 Maxwells B. 106 Maxwells C. 104 Maxwells D. 102 Maxwells "
C
"One ampere is equal to how many electrons per second? A. 1 x 1018 electrons/sec. B. 1 x 1019 electrons/sec. C. 6.25 x 1018 electrons/sec. D. 6.25 x 1019 electrons/sec. "
D
"One electron volt (eV) is equivalent to A. 1.0 watt-sec B. 1.6 x 10-19 watt-sec C. 1.0 Joule D. 1.6 x 10-19 Joules "
D
"Permeability of a material means: A. The ability of the material to conduct electric field B. The conductivity of the material for electromagnetic field C. The ability of the material to hold magnetic flux D. The conductivity of the material for magnetic lines of force "
A
"Permeance is analogous to A. conductance B. resistance C. impedance D. elastance "
A
"Protons are about ____ heavier than electrons. A. 1800 times B. Less than thrice C. Less D. Twice "
D
"Refers to a force of field that exists between ions where they either repel or attract each other. A. Resisting field B. Potential field C. Dielectric D. Electromotive "
B
"Refers to the lowest voltage across any insulator that can cause current flow. A. conduction voltage B. breakdown voltage C. voltage flow D. voltage drop "
A
"Relative permittivity is also known as A. dielectric constant B. dielectric strength C. isolation strength D. permeability "
D
"Resistance in electrical circuits is analogous to _________ in magnetic circuits. A. Conductance B. Permeance C. Elastance D. reluctance "
A
"Reversing the flow of current in a circuit A. reverses the magnetic polarity B. increase the magnetic field intensity C. decreases the magnetic intensity D. enhances hysteresis "
A
"Statcoulomb is also known as A. electrostatic unit (esu) B. electron volt C. electron unit D. static unit "
D
"States that each electron in an atom must have a different set of quantum numbers. A. Quantum principle B. Fermi-Dirac principle C. Spin principle D. Exclusion principle "
D
"Suppose there is an atom containing eight protons and eight neutrons in the nucleus, and two neutron are added to the nucleus, the resulting atomic weight is about A. 8 B. 10 C. 16 D. 18 "
B
"Test charge has a charge of A. 0 Coulomb B. +1 Coulomb C. -1 Coulomb D. Infinity "
D
"The Gauss is a unit of A. permeability B. electromagnetic force C. magnetic force D. magnetic flux density "
A
"The Oersted (Oe) is the same as A. 1 Gb/cm B. 1 Gb/m C. 10 Gb/cm D. 10 Gb/cm "
D
"The ability of a material to resist current flow is called "resistance". What is (are) the factor(s) that affect its value? A. temperature B. length & cross-sectional area C. atomic structure D. all of these "
C
"The ability of the material to store electrical potential energy under the influence of an electric field. A. capacity B. permeability C. permittivity D. conductivity "
B
"The ability to concentrate magnetic lines of force. A. retentivity B. permeability C. susceptability D. reluctivity "
A
"The absolute permittivity of air or free space. A. 1/36π x 10-9 F/m B. 36π x 10-9 F/m C. 1/36π x 10-19 F/m D. 36π x 10-19 F/m "
A
"The amount of magnetic field needed to remove residual magnetism from a transformer core during each half cycle is called the A. coercive force B. residual field C. hysteresis field D. demagnetizing force "
A
"The amount of resistance that a wire has with regards to the flow of electric current A. is less for a conductor than for an insulator B. is less for an insulator than for a semiconductor C. is less for a semiconductor than for a conductor D. is high for a semiconductor than for an insulator "
B
"The area of a conductor whose diameter is 0.001 inch is equal to A. one angstrom B. one circular mil C. one micron D. one steradian "
C
"The atomic number of an element is determined by the number of A. electrons B. valence electrons C. protons D. protons or neutrons "
D
"The atomic weight of an element is determined by the number of A. electrons B. valence electrons C. protons D. protons and neutrons "
D
"The basic law for interaction of charged bodies at rest. A. Charged law B. Gauss' law C. Faraday's law D. Coulomb's law "
A
"The bigger the diameter of a wire, A. more current can pass B. less current can pass C. more heat is generated when current flow D. the higher is the electrical resistance "
B
"The capacity of a substance to become magnetized. This is expressed as a ratio between the magnetization produced in a substance to the magnetizing force producing it. A. magnetic conductivity B. magnetic susceptibility C. magnetic resistivity D. magnetic reluctivity "
C
"The cgs unit of magnetomotive force A. Volt B. Weber C. Gilbert D. Ampere-turn "
C
"The circuit element that is used represent the energy stored in a magnetic field. A. resistance B. capacitance C. inductance D. elastance "
B
"The concept whereby a small voltage is generated by a conductor with current in an external magnetic field is known as A. Wiegand effect B. Hall effect C. Wiedemann effect D. Wall effect "
C
"The condition in which a substance attracts pieces of iron is known as A. Electromagnetism B. Electrolysis C. Magnetism D. Magnetic Induction "
A
"The current needed for a coil of 200 turns to provide a 400 ampere turn magnetizing force is A. 2 A B. 4 A C. 6 A D. 8 A "
A
"The difference in energy between the valence and conduction bands of a semiconductor is called A. band gap B. extrinsict photoeffect C. conductivity D. energy density "
A
"The direction of field lines outside a magnet is A. from north to south pole B. from south to north pole C. either from north to south or south to north pole D. dependent on the magnet's orientation with respect to the earth's magnetic pole "
C
"The discrete amount of energy required to move an electron from a lower shell to a higher shell. A. negative energy B. positive energy C. quantum D. quanta "
A
"The effect that describes the ability of a mechanically stressed ferromagnetic wire to recognize rapid switching of magnetization when subjected to a DC magnetic field. A. Wiegand effect B. Wertheim effect C. Wiedemann effect D. Wall effect "
C
"The emf induced in a coil due to the change of its flux linked with it is called A. mutual emf B. crossfire induced emf C. self induced emf D. virtually induced emf "
A
"The energy gap between the valence band and conduction band of a conductor is in the order of A. zero electron volt (0 eV) B. one electron volt (1 eV) C. five electron volt (5 eV) D. ten electron volt (10 eV) "
C
"The energy gap of an insulator is in the order of A. zero electron volt (0 eV) B. one electron volt (1 eV) C. five electron volt (5 eV) D. one-tenth electron volt (0.1 eV) "
C
"The entire group of magnetic field lines flowing outward from the north pole of a magnet. A. magnetic field B. magnetic flux density C. magnetic flux D. electromagnetic field "
B
"The equivalent of 1 x 10^9 Maxwells is A. 1 Weber B. 10 Weber C. 100 Weber D. 1,000 Weber "
B
"The force between the two electrically charged body is called A. electromotive force B. electrostatic force C. electromagnetic force D. magnetic force "
A
"The force between two electrically charged body is A. directly proportional to the charge B. inversely proportional to the charge C. not affected by the charge D. universally constant "
C
"The force between two magnetic poles in relation to their pole strength is ________. A. not related B. inversely proportional C. directly proportional D. independent"
B
"The force between two magnetic poles is _________ permeability of the medium. A. directly proportional to the B. inversely proportional to the C. not dependent of the D. exponentially proportional to the "
B
"The greater the diameter of a wire, the _______ is the resistance. A. greater B. lesser C. harder D. bigger "
D
"The imaginary lines representing the electric field. A. Electric field B. Electric flux C. Electric flux density D. Electric lines of force "
D
"The imaginary lines representing the magnetic field. A. magnetic field B. magnetic flux C. magnetic flux density D. magnetic lines of force "
C
"The lightest kind of atom or element A. Helium B. Oxygen C. Hydrogen D. Titanium "
A
"The longer the wire the ________ is the resistance A. higher B. lesser C. harder D. smaller "
B
"The magnetic flux around a straight, current carrying wire, is stronger A. near the edge B. near the wire C. at the center D. at both edge "
B
"The magnitude of electromotive force (emf) that is induced when a conductor cuts magnetic flux is directly proportional to its rate. A. Faraday's first law B. Faraday's second law C. Coulomb's first law D. Coulomb's second law "
B
"The mass of a proton is approximately A. 1.6726 x 10^-19 Kg B. 1.6726 x 10^-27 Kg C. 1.6022 x 10^-19 Kg D. 1.6022 x 10^-27 Kg "
A
"The maximum number of electrons (Ne) that can occupy a given shell (n) is determined by the formula A. Ne = 2n^2 B. Ne = n^2 C. Ne = 2^n D. Ne = 2n "
D
"The measure of density of the electric charge A. Electric gradient B. Electric current C. Electric charge D. Electric potential "
D
"The measure of electric field strength per unit length is known as electric field intensity or simply electric intensity. What is its unit? A. Volt/meter (V/m) B. Joules/Coulomb-meter (J/Cm) C. Newton/Coulomb (N/C) D. All of the above "
D
"The natural magnet refers to A. steel B. soft iron C. magnesia D. loadstone (lodestone) "
B
"The net movement of charged particles in one direction or another. A. flow B. current C. drift current D. diffusion current "
A
"The nucleus of an atom is normally A. Neutral B. Positively charged C. Negatively charged D. Either positively or negatively charged "
C
"The number of lines per unit area in a plane perpendicular to the electric lines of force. A. Electric field B. Electric flux C. Electric flux density D. Electric lines of force "
C
"The number of lines per unit area in a plane perpendicular to the magnetic lines of force. A. magnetic field B. magnetic flux C. magnetic flux density D. magnetic lines of force "
C
"The particles that make up the lattice in ionic crystal A. molecules B. ions C. electrons D. neutrons "
A
"The permeability of free space. A. 4π x 10-7 H/m B. 12.56 x 10-7 F/m C. 8.854 x 10-7 H/m D. 8.854 x 10-12 F/m "
B
"The phenomenon in which a substance becomes a magnet when placed near a magnet. A. magnetic transfer B. magnetic induction C. electromagnetism D. magnetism "
A
"The physical motion resulting from the forces of magnetic fields. A. motor action B. linear motion C. rectilinear motion D. generator action "
D
"The process in which atoms are changed into ions. A. oxidation B. passivation C. metallization D. ionization "
D
"The property of a material which opposes the creation of magnetic flux. A. elastance B. permeance C. susceptance D. reluctance "
A
"The rate at which electrons pass a given point in the circuit gives the magnitude of A. electron current B. magnetic current C. drift current D. diffusion current "
B
"The ratio of material permeability to the permeability of air or vacuum. A. relative conductivity B. relative permeability C. inverse permeability D. inverse permittivity "
B
"The reciprocal of reluctance A. conductance B. permeance C. elastance D. capacitance "
D
"The reciprocal of resistance A. permeance B. elastance C. inductance D. conductance "
B
"The relative permittivity of air. A. 0 B. 1 C. 1/36π x 10-9 F/m D. 8.854 x 10-12 F/m "
D
"The science of physical phenomena at very low temperature, approaching absolute zero is called ________. A. crytanalysis B. cybernetics C. temperature inversion D. cryogenics "
A
"The space outside a magnet where its poles has a force of attraction or repulsion on another magnetic pole. A. magnetic field B. magnetic flux C. magnetic flux density D. magnetic lines of force "
A
"The space outside or surrounding an electric charge where it has a force of attraction or repulsion. A. Electric field B. Magnetic field C. Electromagnetic field D. Electric flux "
D
"The temperature coefficient of resistance of a certain wire is known to be 0.004/°C at zero degrees Celsius. What would be the temperature coefficient at room temperature? A. 0.00018/°C B. 0.00036/°C C. 0.00180/°C D. 0.00360/°C "
D
"The term of energy that is stored in an electromagnetic or electrostatic field A. kinetic energy B. static energy C. dynamic energy D. potential energy "
B
"The typical saturation flux density for most magnetic materials. A. 0.1 Wb/m2 B. 2 Wb/m2 C. 10 Wb/m2 D. 20 Wb/m2 "
A
"The unit Ampere is equivalent to A. one Coulomb/second B. one Coulomb/min C. one Joule/sec D. one Joule/min "
A
"The unit of current. A. Ampere B. Ampere/sec. C. Ampere-sec. D. Ampere-hr. "
B
"The unit of flux density in mks A. Gauss B. Weber/m2 C. Maxwell D. Tesla "
D
"The unit of magnetic flux density in SI: A. Gauss B. Weber C. Maxwell D. Tesla "
B
"The unit of permittivity A. Henry/meter (H/m) B. Farad/meter (F/m) C. Henry-meter (H-m) D. Farad-meter (F-m) "
C
"The unit of reluctance A. Gilbert B. Tesla C. At/Wb D. Gauss "
B
"The value of k in Coulomb's electrostatic force equation ( F = kQ1Q2/r2 ) is oftentimes expressed as 1/4πεο. What is εο? A. absolute permeability B. absolute permittivity C. relative permeability D. relative permittivity "
D
"Three charges of +5 C, -6 C and +7 C are placed inside a sphere, what is the total charge of the sphere? A. +5 Coulomb B. -6 Coulomb C. -7 Coulomb D. +6 Coulomb "
B
"Three charges of +5 C, -6 C, and +7 C are inside a sphere, what is the total electric flux passing through the surface of the sphere? A. 5 Coulombs B. 6 Coulombs C. 7 Coulombs D. 8 Coulombs "
A
"To determine whether a material can support the flow of electricity or not, we need to examine its A. Atomic structure B. Physical state C. Molecular structure D. Chemical composition "
A
"Unit of permeability A. Henry/meter (H/m) B. Farad/meter (F/m) C. Henry-meter (H-m) D. Farad-meter (F-m) "
B
"Voltage in electrical circuits is analogous to _________ in magnetic circuits. A. Ampere-turn B. Magnetomotive force C. Magnetizing force D. Flux "
A
"What composes all matter whether a liquid, solid or gas? A. Atoms B. Electrons C. Protons D. Neutrons "
B
"What do you call a negatively charged ion? A. electron B. anion C. cation D. domain "
B
"What do you call a pole that when place in air with a similar and equal pole will cause a force of repulsion of 1/4πμο Newtons? A. South Pole B. Unit pole C. Convergence pole D. Universal Pole "
C
"What do you call a positively charged ion? A. cathode B. anion C. cation D. domain "
C
"What do you call materials, which possess very high permeabilities? A. diamagnetic B. paramagnetic C. ferromagnetic D. antimagnetic "
C
"What do you call the force that sets up or tends to set up magnetic flux in a magnetic circuit? A. electromotive force B. potential difference C. magnetomotive force D. dynamic force "
D
"What do you call the loss of electrical energy in counter balancing the residual magnetism in each cycle? A. hysteresis B. magnetomotive C. leakage D. coercivity "
B
"What do you call the phenomenon whereby substance attracts pieces of iron? A. Permeability B. Magnetism C. Naturalism D. Electromagnetism "
D
"What do you call the potential required to remove a valence electron? A. valence potential B. threshold potential C. critical potential D. ionization potential "
D
"What do you call the quantity of magnetism retained by a magnetic material after the withdrawal of a magnetizing force? A. Left over magnetism B. Coercivity C. Hysteresis D. Residual magnetism "
B
"What do you call the total number of electric lines of force in an electric field? A. Electric field B. Electric flux C. Electric flux density D. Electric lines of force "
B
"What do you call the total number of magnetic lines of force in a magnetic field? A. magnetic field B. magnetic flux C. magnetic flux density D. magnetic lines of force "
C
"What does a gaussmeter measure? A. flux B. magnetic field C. magnetic flux density D. mmf "
C
"What elements possess four valence electrons? A. Insulators B. Semi-insulators C. Semiconductors D. Conductors "
C
"What happens in the resistance of copper wire when its temperature is raised? A. decreased B. steady C. increased D. zero "
A
"What is a magnetic field? A. A force set up when current flows through a conductor. B. A force set up when a charged body is at static. C. The space between two electrically charged particles. D. The space around a conductor. "
D
"What is meant by back EMF? A. A voltage that is applied in the reverse direction. B. An EMF that is dude to the fly wheel effect. C. An EMF that is generated from the back of an electromagnet. D. A voltage that opposes the applied EMF. "
B
"What is residual magnetism? A. The external magnetic field when the current is flowing through the exciting coil. B. The flux density, which exist in the iron core when the magnetic field intensity is reduced to zero. C. The flux density, which exist in the iron core when the magnetic field intensity is at its maximum value. D. The flux density when the magnetic core is saturated. "
C
"What is the charge magnitude, Q of a body if it lacks 5 electrons? A. 5 x 10-19 Coulomb B. 5 Coulomb C. 8 x 10-19 Coulomb D. 19 x 10-19 Coulomb "
A
"What is the charge of an electron? A. 1.6022 x 10^-19 C B. 9.1096 x 10^-19 C C. 1.6022 x 10^-31 C D. 9.1096 x 10^-31 C "
D
"What is the law whereby the force of attraction and repulsion between poles is inversely proportional to the square of the distance between them? A. Newton's first law B. Newton's second law C. Norton's law D. Coulomb's second law "
B
"What is the law whereby the force of attraction or repulsion between poles is inversely proportional to the square of the distance between them? A. Coulomb's first law B. Coulomb's second law C. Coulomb's third law D. Coulomb's law "
B
"What is the relative permeability of air? A. 0 B. 1 C. 4π x 10-7 H/m D. 8.854 x 10-12 F/m "
A
"What is the relative permeability of paramagnetic substance? A. slightly greater than 1 B. very much greater than 1 C. slightly less than 1 D. very much smaller than 1 "
A
"What is the smallest element of a matter? A. Atom B. Molecule C. Crystal D. Wafer "
D
"What is the term used to express the amount of electrical energy stored in an electrostatic field? A. Volts B. Watts C. Coulombs D. Joules "
C
"What is the unit of flux in cgs? A. Ampere-turn (At) B. Coulomb/sec. (C/s) C. Maxwell (Mx) D. Gauss "
A
"What is the unit of magnetic flux in SI system? A. Weber B. Maxwell C. Tesla D. Gauss "
D
"What is true in visualizing electric field lines of force from a charge body? A. Field lines are continuous curve and they never intersect. B. The spacing between these lines increases as they get far from the charged body. C. The number of field lines is directly proportional to the magnitude of the electric field. D. All of the above. "
C
"What law in electronics where an induced current will be in such a direction that its own magnetic field will oppose the magnetic field that produces the same? A. Electromagnetic law B. Nortons law C. Lenz law D. Maxwell law "
D
"What law that describes the force of attraction or repulsion between two charges is directly proportional to their strengths and inversely proportional to the square of the distance between them? A. Coulomb's first law B. Coulomb's second law C. Coulomb's third law D. Coulomb's law or law of electrostatics "
A
"What law that describes the force of attraction or repulsion between two magnetic poles is directly proportional to their strengths? A. Coulomb's first law B. Coulomb's second law C. Ampere's law D. Gauss' law "
A
"What particles that revolve around the positive nucleus? A. Electrons B. Protons C. Neutrons D. Electrons and protons "
C
"What will happen to an atom if an electron is either taken out or taken into the same atom? A. Becomes negative ion B. Becomes positive ion C. Becomes an ion D. Nothing will happen "
D
"What will happen when two opposite charges get closer? A. repels less B. attracts less C. repels more D. attracts more "
D
"When a conductor is moved through a magnetic field a voltage is always induced. The amount of voltage is always proportional to A. the diameter of the conductor used B. the length of the conductor C. the distance of the conductor from the field D. the rate at which the conductor is moved "
B
"When all atoms of a molecule are the same, the substance is called A. a crystal B. an element C. a compound D. an ion "
C
"When an atom gains an additional _________, it results to a negative ion. A. neutron B. proton C. electron D. atom "
A
"When current in a conductor increases, Lenz' law states that the self-induced potential will A. produce current opposite to the increasing current B. tend to produce more magnetic field C. tend to augment the increase in current D. produce current with the same direction to the increasing current "
C
"When one coulomb of electric charge continuously passes a given point every second, the electric current is said to A. 1 μA B. 1 mA C. 1 A D. 10 A "
A
"When the charge of an atom becomes unbalanced, the atom is said to carry A. Electric charge B. Magnetic charge C. Electromagnetic charge D. Electrical current "
C
"When you demagnetize property by applying an AC field and then gradually reduced it to zero, it is called A. damping B. decaying C. degaussing D. gaussing "
A
"Where does practically all of the RF current flow in a conductor? A. along the surface B. in the center of the conductor C. in the electromagnetic field in the conductor center D. in the magnetic field around the conductor "
A
"Which material has more free electrons? A. Conductor B. insulators C. mica D. dielectric "
A
"Which material has the least number of valence electrons? A. conductor B. semiconductor C. insulator D. semi-insulator "
A
"Which of the following determines the strength of a magnetic field around a conductor? A. amount of current B. diameter of the conductor C. length of the conductor D. amount of voltage "
D
"Which of the following is not a basic part of an atom? A. Electron B. Proton C. Neutron D. Coulomb "
C
"Which of the following refers to a characteristic of a magnetic line of force? A. Travels from south to north through the surrounding medium of a bar magnet B. Travels back and forth between the north and south pole of a bar magnet C. Travels from north to south through the surrounding medium of a bar magnet D. Stay stationary between the north and the south of a bar magnet "
D
"Which of the given below can produce the most induced voltage? A. 1 A dc B. 1 A, 60 Hz C. 50 A dc D. 1 A, 400 Hz "
A
"Which of the materials below that can be easily magnetized? A. soft magnetic materials B. hard magnetic materials C. low conductive materials D. high conductive materials "
A
"Why is the resistance of a conductor different for RF current than for DC? A. Because of skin effect B. Because conductors are non-linear devices C. Because the insulation conducts current at radio frequency D. Because of the Heisenberg effect "
C
"________ is one factor that does not affect resistance. A. Cross sectional area B. Resistivity C. Mass D. Length "
D
"_________ is called the magnetic field. A. The force that drives current through a resistor B. Current flow through space around a permanent magnet C. The force between the plates of charged capacitor D. A force set up when current flow through a conductor "
B
"__________ capability is analogous to permeance. A. Admittance B. Conductance C. Reluctance D. Resistance "
C
"__________ has a unit of electronvolt (eV). A. Charge B. Potential difference C. Energy D. Current "
C
"__________ is the procedure by which an atom is given a net charge by adding or taking away electron. A. Polarization B. Irradiation C. Ionization D. Doping "
D
"_____________ are electrons at the outer shell A. Inside shell electrons B. Conductor electrons C. Outside shell electrons D. Valence electrons "