Q&A Hero

Q: Electrons can be transferred from one place to another by the process of A) friction. B) contact, which means touching. C) induction, which means non-touching. D) all of the above E) none of the above

Q: Superconductors most often require A) low operating temperatures. B) high operating temperatures. C) magnets.

Q: Superconductors are noted for their A) high electric resistance. B) low electric resistance. C) absence of electric resistance. D) low cost. E) bright colors.

Q: A semiconductor can be A) a conductor. B) an insulator. C) both of these D) neither of these

Q: A transistor is an example of a A) resistor. B) superconductor. C) semiconductor. D) dry cell. E) transmitter.

Q: A conductor differs from an insulator in that a conductor has more A) electrons than protons. B) protons than electrons. C) energy than an insulator. D) faster moving molecules. E) none of the above

Q: Charge carriers in a metal are electrons rather than protons because electrons are A) negative. B) smaller. C) loosely bound. D) none of the above

Q: Insulating materials are composed of atoms with A) weak cohesive forces. B) tightly bound outer electrons. C) excess protons. D) vastly more charge than conductors.

Q: Conducting materials are composed of atoms with A) strong cohesive forces between them. B) loose outer electrons. C) excess neutrons compared with protons. D) vastly more charge than insulators.

Q: Two charged particles attract each other with a force F. If the charges of both particles are doubled, and the distance between them also doubled, then the force of attraction will be A) F. B) 2 F. C) F/2. D) F/4. E) none of the above

Q: Two charged particles repel each other with a force F. If the charge of both particles is tripled and the distance between them is also tripled, then the force will be A) F. B) 2 F. C) F/2. D) F/4. E) none of the above

Q: Two charged particles repel each other with a force F. If the charge of one of the particles is doubled and the distance between them is halved, then the force will be A) F. B) 2 F. C) F/2. D) F/4. E) none of the above

Q: Two charged particles repel each other with a force F. If the charge of one of the particles is doubled and the distance between them is also doubled, then the force will be A) F. B) 2 F. C) F/2. D) F/4. E) none of the above

Q: Two charges that are separated by one meter exert 1-N forces on each other. If the magnitude of each charge is doubled, the force on each charge is A) 1 N. B) 2 N. C) 4 N. D) 8 N. E) none of the above

Q: Two charges separated by one meter exert 1-N forces on each other. If the charges are pulled 3 meters apart, the force on each charge will be A) 0.11 N. B) 0.33 N. C) 0 N. D) 3 N. E) 9 N.

Q: Two charges that are separated by one meter exert 1-N forces on each other. If the charges are pushed together so the separation is 25 centimeters, the force on each charge will be A) 1 N. B) 2 N. C) 4 N. D) 8 N. E) 16 N.

Q: Particle A has twice the charge of nearby particle B. Compared to the force on Particle A, the force on Particle B is A) half as much. B) the same. C) twice as much. D) four times as much. E) none of the above

Q: When the distance between two charges is halved, the electrical force between them A) is reduced by 1/4. B) halves. C) doubles. D) quadruples. E) none of the above

Q: The electrical force between electric charges depends only on their A) magnitude. B) separation distance. C) both of these D) neither of these

Q: The electrical force between charges is strongest when the charges are A) close together. B) far apart. C) either of these D) need more information

Q: A main difference between gravitational and electric forces is that electrical forces A) attract. B) repel or attract. C) obey the inverse-square law. D) act over shorter distances. E) are weaker.

Q: Two protons attract each other gravitationally and repel each other electrically. The stronger of these two forces is A) gravitation. B) electrical. C) neither of these

Q: The unit of electric charge, the coulomb, is the charge on a A) single electron. B) specific large number of electrons. C) neutron. D) specific number of neutrons. E) quark.

Q: It is said that electric charge is conserved, which means that electric charge A) may occur in an infinite variety of quantities. B) is a whole number multiple of the charge of one electron. C) will interact with neighboring electric charges. D) can be neither created nor destroyed. E) is sometimes negative.

Q: It is said that electric charge is quantized, which means that the charge on an object A) may occur in an infinite variety of quantities. B) is a whole-number multiple of the charge of one electron. C) will interact with neighboring electric charges. D) can be neither created nor destroyed. E) is sometimes positive.

Q: If electrons are stripped from an atom it becomes a A) positive ion. B) negative ion. C) different element. D) molecule.

Q: A positive ion has more A) electrons than neutrons. B) electrons than protons. C) protons than electrons. D) protons than neutrons. E) neutrons than protons.

Q: To become a positive ion, an atom must A) lose an electron. B) gain an electron. C) lose a proton. D) gain a proton.

Q: To become a negative ion, an atom must A) lose an electron. B) gain an electron. C) lose a proton. D) gain a proton.

Q: An electrically charged atom is an A) ion. B) isotope. C) both of these D) neither of these

Q: To say that electric charge is conserved means that no case has ever been found where A) the total charge on an object has changed. B) quantity of negative charge on an object exactly balances positive charge. C) the total quantity of charge on an object has increased. D) net charge has been created or destroyed. E) none of the above

Q: Which of these has the greatest mass? A) proton B) electron C) both of these D) neither of these

Q: Which of these does NOT have an electrical charge? A) proton B) electron C) neutron D) all of the above E) none of the above

Q: In an electrically neutral atom the number of protons in the nucleus is equal to the number of A) electrons that surround the nucleus. B) neutrons in the nucleus. C) both electrons and neutrons. D) none of the above

Q: The pair of protons in the nucleus of a helium atom A) attract a pair of orbiting electrons. B) repel orbiting electrons. C) both of these D) neither of these

Q: The vast numbers of electrons in a coin don't fly off the surface because A) mutual repulsion is incomplete. B) they are attracted by an equal number of protons. C) they are strongly bonded to their atoms. D) all of the above E) none of the above

Q: An electron and a proton A) attract each other. B) repel each other. C) neither attract nor repel each other.

Q: A fundamental rule of electricity is that A) like kinds of charges repel. B) unlike kinds of charges attract. C) both of these D) neither of these

Q: The fundamental force underlying all chemical reactions is A) gravitational. B) nuclear. C) centripetal. D) electrical. E) none of the above

Q: The force that binds atoms together to form molecules is A) gravitational. B) nuclear. C) electrical. D) centripetal. E) none of the above

Q: Electrostatics is a branch of electricity that focuses on A) electrical charge. B) electrical force. C) both of these when static. D) none of the above

Q: Just as "gravity" is the study of a wide range of gravitational interactions, "electricity" is the study of a wide range of A) electrical charges. B) electrical forces. C) electrical interactions. D) none of the above

Q: The laser light that can carry more information is A) red. B) blue. C) either of these D) neither of these

Q: Which makes central use of the binary system? A) phonograph records B) DVDs C) both of these D) neither of these

Q: Analog sound signals are produced by A) phonograph records. B) CDs. C) DVDs. D) all of the above E) none of the above

Q: Fourier analysis is something accomplished A) with all musical instruments. B) automatically by humans. C) both of these D) neither of these

Q: The frequencies needed to reproduce high-quality sounds are A) within the range of hearing. B) beyond the range of hearing. C) centered about 2000 hertz. D) none of the above

Q: Fourier analysis makes central use of A) wave superposition. B) partial tones. C) harmonics. D) none of the above

Q: Fourier discovered that periodic waves can be represented by A) a series of non-periodic waves. B) the summation of a series of simple sine waves. C) a binary code. D) pulses of the same amplitude.

Q: Vibrating membranes relate to which instrument? A) violin B) drum C) oboe D) all of the above E) none of the above

Q: Vibrating air columns relate to which instrument? A) guitar B) harp C) trumpet D) all of the above E) none of the above

Q: Which of these strongly relate to a saxophone and clarinet? A) vibrating air B) length of tube. C) both of these D) neither of these

Q: Which of these strongly relate to a piano string? A) mass B) length C) pitch D) all of the above E) none of the above

Q: The wind instrument with no keys or valves is a A) trumpet. B) saxophone. C) clarinet. D) bugle.

Q: The pitch of a guitar relates to the string's A) length. B) tension. C) mass. D) all the above E) none of the above

Q: Sounds from musical instruments are produced by A) vibrating strings. B) vibrating air columns. C) percussion. D) all of the above E) none of the above

Q: How many octaves exist between 20 hertz and 2560 hertz? A) 5 B) 6 C) 7 D) 8 E) 9

Q: How many octaves exist between 40 hertz and 1280 hertz? A) 5 B) 6 C) 7 D) 8 E) 9

Q: How many octaves exist between 100 hertz and 1600 hertz? A) 4 B) 5 C) 6 D) 7 E) 8

Q: The number of nodes in a standing wave of three wavelengths, not including the endpoints, is A) 2. B) 3. C) 4. D) 5. E) 6.

Q: The number of nodes in a standing wave of two wavelengths, not including the endpoints, is A) 2. B) 3. C) 4. D) 5. E) 6.

Q: The number of nodes in a standing wave of one wavelength, not including the endpoints, is A) 0. B) 1. C) 2. D) 3. E) 4.

Q: The frequency of a note one octave higher in pitch than a 440-Hz note is A) 1760 Hz. B) 880 Hz. C) 440 Hz. D) 220 Hz. E) 110 Hz.

Q: The fundamental frequency of a violin string is 440 hertz. The frequency of its second harmonic is A) 220 hertz. B) 440 hertz. C) 880 hertz. D) none of the above

Q: The strings in musical instruments that have greater mass tend to produce notes of A) higher frequency. B) lower frequency. C) the same frequency. D) none of the above

Q: Reverberation is a phenomenon you would be most likely to hear if you sing in A) the shower. B) a small drape-covered room. C) a large drape-covered room. D) the desert.

Q: The quality of a musical note has to do with its A) loudness. B) frequency. C) harmonics. D) amplitude. E) none of the above

Q: Compared to a sound of 30 decibels, the intensity of a sound of 60 decibels is A) twice as intense. B) 10 times as much. C) 100 times as much. D) 1000 times as much. E) 10,000 times as much.

Q: Compared to a sound of 40 decibels, the intensity of a sound of 50 decibels is A) 10 times as much. B) 100 times as much. C) 1000 times as much. D) 10,000 times as much. E) more than 10,000 times as much.

Q: Whereas loudness is a physiological sensation, sound intensity is A) the same. B) measurable with acoustical instruments. C) both of these D) neither of these

Q: A decibel is a measure of a sound's A) frequency. B) wavelength. C) speed. D) loudness. E) all of the above

Q: What is the threshold of hearing? A) 0.1 decibel B) 0.01 decibel C) 1 decibel D) 10 decibel E) none of the above

Q: The loudness of a sound is most closely related to its A) speed. B) frequency. C) wavelength. D) intensity.

Q: Which of these relate most to the loudness of sound? A) wavelength. B) frequency. C) speed. D) amplitude. E) all of the above

Q: Double the frequency of musical note and you double its A) wavelength. B) speed. C) amplitude. D) all of the above E) none of the above

Q: Double the frequency of a musical note and you halve its A) wavelength. B) speed. C) amplitude. D) all of the above E) none of the above

Q: We don't hear the squeaks of bats because their sound is A) of ultra-high frequencies. B) of ultra-high loudness. C) both of these D) neither of these

Q: Each note on a piano keyboard has its own A) pitch. B) loudness. C) wavelength. D) amplitude. E) none of the above

Q: As we grow older, the greatest hearing difficulty is with frequencies that are A) low. B) mid-range. C) high.

Q: As we become older, the frequency range of human hearing A) decreases. B) increases. C) remains relatively constant.