That's Physics For Ya! - Part 2: Question Preview (ID: 25854)


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Which of the following statements is true?
a) Positive charges attract positive charges. b) Negative charges are attracted to negative charges. c) South poles are attracted to north poles. d) North poles attract north poles.
Why might there be an adapter on a power cord?
a) To make the current alternate more frequently and change the voltage b) To change the voltage and convert AC to DC c) To change the voltage and convert DC to AC d) To make the current alternate more frequently
What will happen to a neutrally charged, light metal sphere placed very near the Van de Graf?
a) It will always be repelled. b) It will always be attracted. c) It will be repelled and then attracted. d) It will be attracted and then repelled.
What actually moves in a DC circuit?
a) Electrons from the negative terminal to the positive one. b) Protons from the negative terminal to the positive one. c) Electrons from the positive terminal to the negative one. d) Protons from the positive terminal to the negative one.
In fluorescent tubes, how is the electricity changed into light?
a) Electrons in the gas are sent to higher energy levels and then release light as they fall back to the lower levels. b) The white coating on the inside heats up due to the electric current and then gives off photons as a result. c) Electricity causes the chemicals inside the tube to break chemical bonds releasing the light as the molecules break down. d) Electricity causes the molecules inside the tube to vibrate releasing the energy as light as their vibrations dampen.
A circuit has one resistor and one battery. Which of the following will NOT decrease the current flow?
a) Replacing the battery with one of lower voltage b) Replacing the resistor with one of higher resistance c) Connecting another resistor in parallel with the first d) All of these answers will decrease the current.
How can I increase the repulsive force between two charges?
a) Move them farther apart b) Decrease the charge of the first c) Increase the charge of the second d) Change the material from which they are made (without changing the charges)
Which of the following occurs in induction?
a) Like charges are attracted. b) Unlike charges are repelled. c) The originally charged object is attracted to the originally neutrally charged object. d) The objects repel one another.
What is the process by which a neutrally charged conductor can become electrically attracted to a charged object called?
a) Combustion b) Quantum Chromodynamics c) Polarization d) Sonoluminescence
Which of the following is true of charges?
a) The neutron and the electron have equal and opposite charges. b) Up and down quarks have equal and opposite charges. c) protons are electrically neutral. d) The proton and the positron (anti-electron) have the same charge.
When connecting a voltmeter and an ammeter in a circuit, which of the following describes how they should be connected to give proper readings?
a) Both should be connected in series. b) Both should be connected in parallel. c) The voltmeter should be in series, by the ammeter should be in parallel. d) The voltmeter should be in parallel, but the ammeter should be in series.
As a source of sound gets closer to an observer, the sound that the observer hears is:
a) a lower frequency than the emitted frequency b) a higher frequency than the emitted frequency c) the same frequency as the emitted frequency d) either higher of lower depending on the speed of the source
What is the value of Mach?
a) 343 m/s b) 1029 m/s c) 104.3 m/s d) 686 m/s
Which of the following does not require a medium?
a) longitudinal waves b) transverse waves c) electromagnetic waves d) All of the answers require a medium.
Which of the following is a similarity between mechanical waves and electromagnetic waves?
a) Both require a medium. b) Both transfer energy. c) Both can be longitudinal. d) Both can travel through a vacuum.
Two tones are sounded. Which of the following is true of the higher tone?
a) It must have a lower frequency. b) It must have a longer wavelength. c) It must have a higher amplitude. d) None of the above are true.
What is the reflection of a sound wave called?
a) doppler b) polarization c) echo d) mirror
In which of the following does sound travel faster?
a) cold air b) war air c) cold water d) warm water
What does it mean to be polarized?
a) to have transverse waves traveling in many non-parallel planes b) to have transverse waves traveling in many parallel planes c) to have longitudinal waves traveling in many non-parallel planes d) to have longitudinal waves traveling in many parallel planes
Which of the following is NOT true?
a) Radio waves have more energy (per photon) than ultraviolet light. b) Microwaves have more energy (per photon) than radio waves. c) The visible spectrum has more energy (per photon) than infrared. d) Gamma rays have more energy (per photon) than radio waves.
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