Physical Science B Semester Exam 9B Connections Academy
11. Where do the forces that make atoms interact come from?(1 point)
from the electric fields of neutral molecules
from the electric fields of charged molecules
from the electric fields of charged subatomic particles
from the electric fields of neutral subatomic particles
When two charged particles are moving toward each other, their velocities decrease until they eventually come to a stop. What happens afterward?(1 point)
They accelerate toward each other.
They accelerate in opposite directions.
They remain in the same place without moving.
They bond and accelerate together.
12. A bar magnet is held in place while another bar magnet is placed near it. The second bar magnet spins around and attaches to the first magnet on one end. Which statement is correct about the energy stored in the magnetic field? (1 point)
The decrease in the energy stored in the system is proportional to the increase in kinetic energy.
The increase in the energy stored in the system is proportional to the decrease in kinetic energy.
The decrease in the energy stored in the system is proportional to the decrease in kinetic energy.
The increase in the energy stored in the system is proportional to the increase in kinetic energy.
13. Which of the following factors would decrease the magnetic field strength of an electromagnet?(1 point)
using an iron core or nail
increasing the number of turns in the coil of wire
increasing the distances between the turns of the coil
increasing the current or using a higher-voltage power source
What happens when thermal energy is applied to water?(1 point)
Its molecules gain kinetic energy.
The water creates steam as soon as thermal energy is applied.
Its molecules gain potential energy.
Its molecules lose kinetic energy.
14. What is the best description of heat?(1 point)
the transfer of potential energy from one object or substance to another
thermal energy
the transfer of thermal energy from a warmer object or substance to a cooler object or substance
the measure of the average kinetic energy of the particles in an object or substance
15. What is the relationship between heat and thermal conductors?(1 point)
Thermal conductors facilitate heat, the transfer of thermal energy.
Thermal conductors have no effect on heat.
Thermal conductors allow all of the thermal energy in one object or substance to be easily transferred to another object or substance.
Thermal conductors impede heat, the transfer of thermal energy.
16. Which scenario shows radiation?(1 point)
Eggs boil in a pot of water.
Eggs cook in a skillet.
Air warmed by a floor radiator rises to the top of a room, forcing cooler air downward.
The air under a reading lamp is warmed.
17. Which pair of objects will have an attractive electric force?
Pair Object 1 Charge
A -2
B -3
C +3
D +1
Object 2 Charge
A -1
B +1
C +1
D +2
Pair D
Pair C
Pair A
Pair B
18. How does the structure of atoms in a substance determine the substance’s conductivity?(1 point)
If an atom’s outer shell of electrons is tightly bound to the nucleus, the substance is a good conductor.
If an atom’s outer shell of electrons is loosely bound to the nucleus, the substance is a good conductor.
If an atom’s outer shell of electrons is positively charged, the substance is a good conductor.
If an atom’s nucleus is positively charged, the substance is a good conductor.
19. Students build four electromagnets and test them by picking up metal tacks. Here are their partial results.
12 coils 4 tacks
24 coils 9 tacks
36 coils 13 tacks
48 coils ? tacks
Which is the best prediction for the number of nails the electromagnet with 48 coils will pick up?(1 point)
20 tacks
16 tacks
12 tacks
13 tacks
22. How do electromagnets cause a maglev train to levitate above the track? (1 point)
Magnets in the track and magnets in the bottom of the train attract each other.
Magnets in the sides of the tracks constantly repel and attract magnets in the sides of the train.
Magnets in the track and magnets in the bottom of the train repel each other.
Batteries provide electric energy to the electromagnets in the train.
Question
Use the ray diagram for a lens to answer the question.
The illustration shows a candle as an object to the left of a concave lens beyond focus on the left. One ray from the candle falls on the lens parallel to the principal axis and is refracted through the focus on the right. Another ray from the candle falls at the optical center and is refracted undeviated. The two refracted rays meet at a point below the principal axis beyond focus on the right. An inverted image of the object smaller in size is formed.
23.
What happens to sound waves from an object as it moves toward you?(1 point)
The pitch gets lower because of an increase in wavelength.
The pitch gets higher because of an increase in frequency.
The pitch gets higher because of an increase in wavelength.
The pitch gets lower because of an increase in frequency.
Which combination of frequencies would produce the lowest beat frequency?(1 point)
500 Hz and 501 Hz
10 Hz and 20 Hz
10 Hz and 15 Hz
500 Hz and 600 Hz
A sound has a higher pitch than a bell. Which quantity must also be higher in this sound than in the bell?(1 point)
speed
wavelength
amplitude
frequency
27.
Which statement about the effect of temperature on the speed of sound is correct?(1 point)
As temperature increases, the speed of sound increases because the medium becomes denser.
As temperature increases, the speed of sound decreases because molecules in the medium collide less frequently.
As temperature increases, the speed of sound increases because molecules in the medium collide more frequently.
Changes in temperature have no effect on the speed of sound.
Which forms of electromagnetic radiation are arranged in order of increasing energy? (1 point)
gamma rays, ultraviolet, microwaves, infrared
microwaves, infrared, ultraviolet, gamma rays
microwaves, ultraviolet, infrared, gamma rays
infrared, gamma rays, microwaves, ultraviolet
A student is using a weak computer to design a logo. If the weak computer is the only constraint, should the student use the online version or downloaded version of a graphic design software?(1 point)
The online version, because the downloaded version usually requires better equipment than the online version.
The downloaded version, because the online version may have limited bandwidth that limits how quickly the designer can work.
The downloaded version, because the online version usually requires better equipment than the downloaded version.
The online version, because the downloaded version may have limited bandwidth that limits how quickly the designer can work.
11. from the electric fields of charged subatomic particles
12. The decrease in the energy stored in the system is proportional to the increase in kinetic energy.
13. increasing the distances between the turns of the coil
14. the transfer of thermal energy from a warmer object or substance to a cooler object or substance
15. Thermal conductors facilitate heat, the transfer of thermal energy.
16. The air under a reading lamp is warmed.
17. Pair B
18. If an atom’s outer shell of electrons is loosely bound to the nucleus, the substance is a good conductor.
19. 16 tacks
20. Magnets in the track and magnets in the bottom of the train repel each other.
23. The pitch gets higher because of an increase in frequency.
24. 10 Hz and 15 Hz
25. frequency
27. As temperature increases, the speed of sound increases because molecules in the medium collide more frequently.
28. microwaves, infrared, ultraviolet, gamma rays
29. The online version, because the downloaded version may have limited bandwidth that limits how quickly the designer can work.