Which of the following events is caused by magnetic force?
A) A person gets a shock from a doorknob after walking across carpet.
B) Pieces of clothing stick together after being in a clothes dryer.
C) The needle of a compass points toward Earth's North Pole.
D) Objects are constantly pulled toward the center of Earth
The picture shows a child sliding down a plastic slide.
Which statement best describes why the child's hair stands up after he slides down the slide?
A) Friction caused a transfer of electrons between the slide and the child, making each of his like-charged hairs repel each other.
B) Energy was transferred from the slide to the child through induction, causing the child's hair to become charged and stand up.
C) Energy was transferred from the child to the slide through conduction, causing the child's hair to become charged and stand up.
D) Friction caused a transfer of electrons between the slide and the child, making his like-charged hairs attract the air through induction.
Isabella makes an electromagnet by wrapping copper wire around an iron bolt and then connecting each end of the wire to a battery. She observes that the more times that she wraps the copper wire around the bolt, the more paper clips her magnet can pick up. What does she conclude in this experiment?
A) Wrapping more copper wire around the bolt increases the length of the bolt.
B) Wrapping more copper wire around the bolt increases the density of copper.
C) Wrapping more copper wire around the bolt increases the mass of the battery.
D) Wrapping more copper wire around the bolt increases the strength of her electromagnet.
Which component is NOT a component that makes up an electromagnet?
A) core
B) light bulb
C) wire coil
D) electric current
Which of the following statements regarding electric insulators is correct?
A) Electric insulators are good heat conductors.
B) Electric insulators have high tensile strength.
C) Charges within electric insulators do not readily move.
D) Electric charges move freely in electric insulators.
Maricela and Joaquim are standing on the floor very close to each other. They are not touching. Which of the following statements is true about the forces that are present?
A) The is a large gravitational repulsion between the two students.
B) There is a large gravitational attraction between the two students.
C) There is a small gravitational repulsion between the two students.
D) There is a small gravitational attraction between the two students.
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ASSESSMENT - JACOTATEDU
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Assessment - JACOTATEDU
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Instructions: Complete each question by choosing or typing in the best answer. To receive the highest score, be sure to leave nothing blank. When you have completed the test, click the "Grade My Test Now" button at the end of the test. If you run out of time, click the "Save for Me to Complete Later" button. Tests are automatically saved in case of internet disruption.
1)
The pictures show four electrically charged items.
If a student rubs a glass rod with a piece of silk, giving the rod a positive charge, which of the items will the rod attract?
A) Balloon 1, only
B) Plastic sheet 1, only
C) Balloon 1 and Plastic sheet 2
D) Balloon 2 and Plastic sheet 1
2)
Which two variables determine the gravitational force between two objects?
A) their densities and the distance separating them
B) their masses and the distance separating them
C) their volumes and magnetic strengths
D) their masses and relative densities
3)
Annie is trying to attract her metal pencil box with a magnet from the other side of her desk. The pencil box does not move. What is most likely true?
A) The pencil box is too far away from the magnet to make it move.
B) The pencil box is repelling the force of the magnet.
C) The pencils inside the box are repelling the magnet.
D) The pencil box can not move without touching the magnet.
4)
Ronan rubs a rubber balloon on his hair. He observes that the balloon then sticks to his hair. How did the charges on the balloon and on his hair change?
A) The charge on the balloon became positive. The charge on his hair became negative.
B) The charge on the balloon became negative. The charge on his hair became positive.
C) The charge on the balloon became negative. The charge on his hair became negative.
D) The charge on the balloon became positive. The charge on his hair became positive.
5)
What kind of force can be created with an electrical current?
A) chemical
B) magnetic
C) nuclear
D) frictional
6)
The drawing shows a student holding two negatively charged balloons.
What is most likely to occur if the student brings the balloons closer to each other?
A) The magnitude of the electrostatic force between the balloons will decrease, and they will attract each other.
B) The magnitude of the electrostatic force between the balloons will increase, and they will attract each other.
C) The magnitude of the electrostatic force between the balloons will decrease, and they will repel each other.
D) The magnitude of the electrostatic force between the balloons will increase, and they will repel each other.
7)
Gillian is investigating the distribution of charge in objects using friction. Gillian gently rubs a rubber balloon on the fur of her pet cat. When she pulls the balloon away from the cat's fur, the fur is attracted to the balloon.
Which BEST explains why the fur becomes attracted to the balloon?
A) Rubbing the balloon along the cat transfers extra protons from the balloon to the cat.
B) Rubbing the balloon along the cat transfers extra electrons from the cat to the balloon.
C) Rubbing the balloon along the cat creates extra protons that will stick to both the balloon and cat.
D) Rubbing the balloon along the cat creates extra electrons that will stick to both the balloon and cat.
8)
A student rubs a rubber rod with fur, producing a negative charge on the rod. The student then touches the rod to a hollow, neutral metal sphere that stands on an insulating plastic stand. This transfers negative charges from the rod to the sphere.
Which statement best predicts what will happen to the charge?
A) It will quickly spread to the air around the sphere, because it will seek to occupy as large a volume of neutral matter as possible.
B) It will remain at the point of contact between the rod and the sphere, because resistance in the metal prevents the charges from easily moving.
C) It will distribute itself evenly over the surface of the sphere, because like charges repel and the sphere is a conductor.
D) It will slowly drift to the bottom of the sphere, because the charges rapidly attach to individual atoms, making them slightly heavier than surrounding atoms.
9)
What is produced by a stream of electrons flowing through a wire that is coiled around an iron core?
A) an atomic field
B) a radiation field
C) a magnetic field
D) a static field
10)
A student is investigating the distribution of charges in insulators. The student will place an aluminum metal can on top of a foam cup and touch the side of the foam cup with a negatively charged rod. The set up for the investigation is shown in the diagram.
What will most likely happen to the electrons when the rod touches the foam cup?
A) The electrons will pass to the foam cup but will remain in a localized, positively charged area on the cup where the rod was placed.
B) The electrons will pass from the foam cup to the aluminum can, and both the foam cup and the aluminum can will become positively charged.
C) The electrons will pass from the foam cup to the aluminum can, and both the foam cup and the aluminum can will become negatively charged.
D) The electrons will pass to the foam cup but will remain in a localized, negatively charged area on the cup where the rod was placed.
11)
An electric motor uses regular magnets and an electromagnet to create motion. The attracting and repelling forces create rotational motion along with the electric current from the electromagnet.
What two things can a car manufacturer do to make an electric motor stronger?
A) A car manufacturer can add coils to the electromagnet and increase the size of the magnets causing the rotational motion.
B) The car manufacturer can add coils the the electromagnet and decrease the size of the magnets causing the rotational motion.
C) The car manufacturer can remove coils from the electromagnet and increase the size of the magnets causing the rotational motion.
D) The car manufacturer can remove coils from the electromagnet and decrease the size of the magnets causing the rotational motion.
12)
A student claims that the gravitational force between two objects depends upon the mass of the objects and the distance between them. Which argument best supports the student's claim?
A) If the distance between two objects increases, the gravitational force between the objects will decrease.
B) If the distance between two objects decreases, the gravitational force between the objects will disappear.
C) If the distance between two objects increases, the gravitational force between the objects will increase.
D) If the distance between two objects decreases, the gravitational force between the objects will not change.
13)
Seamus made an electromagnet from an iron nail, a piece of copper wire with three coils spread out across the nail, and a AAA-sized battery. His magnet attracts only one paper clip, and he wants to boost the power of his magnet to attract at least four paper clips. What two things can Seamus do to accomplish his goal?
A) Seamus can add batteries to decrease the voltage, and he can decrease the space between the wire coils.
B) Seamus can add batteries to increase the voltage, and he can increase the space between the wire coils.
C) Seamus can add batteries to increase the voltage, and he can decrease the space between the wire coils.
D) Seamus can add batteries to decrease the voltage, and he can increase the space between the wire coils.
14)
At this point that your whole test from usa test prep or what ever it called surprised the teachers haven't got u
even im not this lazy atleast try some of the questions he really just copy and pasted the whole test huh
theres too many questions in one my brain hurts lol. it looks like they just copied and pasted the whole test or whateverit was/..
The events caused by magnetic force are:
1. C) The needle of a compass points toward Earth's North Pole.
The needle of a compass is a magnet that aligns itself with the Earth's magnetic field, which is caused by magnetic forces.
2. B) Energy was transferred from the slide to the child through induction, causing the child's hair to become charged and stand up.
When the child slides down the slide, friction between the slide and the child's hair causes a transfer of electrons, resulting in a static charge in the hair. The like-charged hairs then repel each other, making the hair stand up.
3. D) Wrapping more copper wire around the bolt increases the strength of her electromagnet.
The strength of an electromagnet is determined by the number of wire coils wrapped around the core (in this case, the iron bolt). Increasing the number of coils increases the number of turns of the wire, which in turn increases the strength of the magnetic field produced by the electromagnet.
4. B) light bulb
A light bulb is not a component that makes up an electromagnet. The core, wire coil, and electric current are the components that make up an electromagnet. The core provides the material that can be magnetized, the wire coil carries the electric current that generates the magnetic field, and the electric current creates the magnetic field.
5. C) Charges within electric insulators do not readily move.
Electric insulators are materials that do not readily allow the movement of electric charges. They have high resistance to the flow of electric current.
6. D) There is a small gravitational attraction between the two students.
Gravitational forces exist between all objects with mass. It is a universal force of attraction, but its strength is dependent on the masses of the objects and the distance between them. In the case of the two students standing on the floor, there is a small gravitational attraction between them due to their masses.
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