PY HW 22-35
A 10 ohm resistor has 5 A current in it. What is the voltage across the resistor? Select one: a. more than 20 V. b. 15 V. c. 5 V. d. 20 V. e. 10 V.
a
A whitish sky is evidence that the atmosphere contains Select one: a. a mixture of particle sizes. b. predominantly small particles. c. predominantly large particles.
a
If three primary colors of light are to shine on a white wall to produce a white spot, the primaries must be Select one: a. additive. b. subtractive. c. divisive.
a
Neon signs require about 12,000 volts to operate. If the circuit uses a 120 volt power source, the ratio of primary to secondary turns on the transformer should be Select one: a. 100:1 b. 1:100 c. neither of these.
a
The speed of light in the void between molecules in glass is Select one: a. the same as its speed in a vacuum. b. less than its speed in a vacuum. c. more than its speed in a vacuum.
a
When a magnet is thrust into a coil of wire, the coil tends to Select one: a. repel the magnet as it enters. b. attract the magnet as it enters. c. neither of these.
a
When you recede from a blinking light source, the frequency of its blinking Select one: a. decreases. b. stays the same. c. increases.
a
Which will warm up quicker in sunlight? Select one: a. a piece of colored glass. b. a piece of clear glass. c. both the same.
a
A balloon will stick to a wooden wall if the balloon is charged Select one: a. negatively. b. either. c. neither. d. positively.
b
A partial solar eclipse occurs for people in the sun's Select one: a. umbra. b. penumbra.
b
A woman standing on the ground sees a rocket ship move past her at 95% of the speed of light. Compared to when the rocket is at rest, the woman measures the rocketʹs length as Select one: a. the same length. b. shorter. c. longer.
b
According to special relativity, one can travel at increased rates Select one: a. backward in time. b. only forward in time. c. both forward and backward in time
b
Color depends on what characteristic of light? Select one: a. neither of these. b. both of these. c. its frequency. d. its wavelength.
b
Compared to clocks in a stationary reference frame, clocks in a moving reference frame run Select one: a. faster. b. slower. c. the same speed.
b
Rub electrons from your hair with a comb and the comb becomes Select one: a. charged positive. b. charged negative.
b
The complementary color of blue is Select one: a. green b. yellow c. red d. magenta e. cyan
b
The magnetic field strength inside a current carrying coil will be greater if the coils encloses a Select one: a. wooden rod. b. iron rod. c. glass rod. d. vacuum.
b
When two lamps are connected in parallel to a battery, the electrical resistance that the battery senses is Select one: a. none of these. b. less than the resistance of either lamp. c. more than the resistance of either lamp.
b
A solar eclipse occurs when the Select one: a. Earth passes into the sun's shadow. b. sun passes into the Earth's shadow. c. Earth passes into the moon's shadow. d. moon passes into the Earth's shadow.
c
A wire carrying a current is normally charged Select one: a. negatively. b. positively. c. not at all
c
A women experiences an electrical shock. The electrons making the shock come from the Select one: a. electric field in the air. b. power plant. c. women's body. d. ground.
c
As more lamps are put into a parallel circuit, the overall current in the power source Select one: a. stays the same. b. decreases. c. increases.
c
Compared to radio waves, the velocity of visible light waves is Select one: a. more. b. less. c. the same.
c
Magenta light is really a mixture of Select one: a. yellow and green light. b. red and yellow light. c. red and blue light. d. red and cyan light.
c
Particle A and particle B interact with each other. Particle A has twice the charge of particle B. Compared to the force on particle A, the force on particle B is Select one: a. four times as much b. two times as much. c. the same. d. half as much
c
The greenish blue of water is evidence for the Select one: a. absorption of greenish-blue light. b. interaction between green and blue frequencies of light. c. absorption of red light. d. reflection of red light.
c
Two charged particles held close to each other are released. As they move, the force on each particle increases. Therefore the particles have Select one: a. the same sign. b. not enough information is given. c. the opposite sign.
c
A positive ion has more Select one: a. neutrons than protons. b. electrons than protons. c. protons than neutrons. d. protons than electrons
d
If you were to travel at speeds close to the speed of light, you would notice that your own Select one: a. pulse decreases. b. shape changes. c. both of these. d. neither of these.
d
Power is transmitted at high voltages because the corresponding current in the wires is Select one: a. also high to deliver appreciable power to distant places. b. neither of these. c. both of these. d. low so that overheating of the wires is minimized
d
The main difference between a radio wave and a sound wave is their different Select one: a. frequencies. b. amplitudes. c. wavelengths. d. basic natures.
d
The primary purpose of a lightning rod is to Select one: a. induce within the structure to which it is attached a charge opposite to that of charged clouds overhead. b. cancel the electric field within the structure to which it is attached. c. attract lightning and guide it to the ground. d. discharge the structure to which it is attached.
d
Voltage can be induced in a wire by Select one: a. moving a magnet near a wire. b. moving the wire near a magnet. c. changing the current in a nearby wire. d. all of these.
d
When a light switch is turned on in a dc circuit, the average speed of electrons in the lamp is Select one: a. the speed of light. b. the speed of sound waves in metal. c. 1000 cm/s. d. less than 1 cm/s.
d
A main difference between gravitational and electrical forces is that electrical forces Select one: a. obey the inverse square law. b. are weaker. c. act over shorter differences. d. attract. e. repel and attract
e
Which of these electromagnetic waves has the shortest wavelength? Select one: a. radio waves. b. infrared waves. c. visible light. d. ultraviolet waves. e. x-rays.
e