Physical Science Spring 2021 Exam Review

A student created an electromagnet out of a piece of copper wire, a nail, and a battery, as shown. The student observed that the electromagnet could not lift paper clips off a desktop as expected. Which hypothesis will most likely help the student build an electromagnet capable of lifting paper clips? A) Using a wooden stick instead of a nail will increase the number of paper clips that the electromagnet can pick up. B) Adding more coils of copper wire to the nail will increase the number of paper clips that the electromagnet can pick up. C) Pushing the coils of copper wire closer together will increase the number of paper clips that the electromagnet can pick up. D) Using a battery that produces less electric current will increase the number of paper clips that the electromagnet can pick up.

B) Adding more coils of copper wire to the nail will increase the number of paper clips that the electromagnet can pick up.

Two objects will experience an electric force of attraction when they have ____. A)like charges B)opposite charges C)the same amount of charge D)no charge

B)opposite charges

During an investigation, a teacher places a small permanent magnet with a hole in it onto a wooden rod. The magnet can slide freely up and down the rod. When the teacher places the magnet and rod on a tabletop above an electromagnet, the magnet slides up the rod as shown in the diagram. A student measures how far the magnet slides up the rod each time the teacher adds an additional battery to the electromagnet. Which question could most likely be answered by this investigation? Multiple choice question. A) How does the size of the magnet affect the distance the magnet travels up the rod? B) How does the distance between the magnet and the electromagnet affect the strength of the magnetic force of the electromagnet? C) How does the amount of the electric current affect the distance the magnet travels up the rod? D) How does the direction of the electric current affect the strength of the magnetic force of the electromagnet?

C) How does the amount of the electric current affect the distance the magnet travels up the rod?

What makes an electric motor spin? Multiple choice question. A) The permanent magnet and the electromagnet continuously attract each other. B) The permanent magnet and the electromagnet continuously repel each other. C) The permanent magnet and the electromagnet alternately attract and repel each other. D) The permanent magnet and the electromagnet alternately attract and repel the power source.

C) The permanent magnet and the electromagnet alternately attract and repel each other.

The south pole of a magnet ____. A) attracts another south pole B) repels a paper clip C) attracts a north pole D) repels a north pole

C) attracts a north pole

When a pot of water is put on a stove, the water at the surface gets hot primarily by ____. Multiple choice question. A) radiation B) conduction C) convection D) condensation

C) convection

Most materials ____ when they are heated. A) condense B) freeze C) expand D) contract

C) expand

How can a wire and a magnet create an electric current? Multiple choice question. A) The magnet moves inside the coil of wire. B) The coil of wire moves through a magnetic field. C) Neither a nor b will produce an electric current. D) Either a or b will produce an electric current.

D) Either a or b will produce an electric current.

Which of the following describes both an electromagnet and a permanent magnet? A) The poles can be reversed. B) The strength of the magnetic force can be controlled. C) The magnetic force can be turned off and on. D) It has a north pole and a south pole.

D) It has a north pole and a south pole.

As the amount of charge on either of two charged objects increases, the electric force between the objects decreases. True False

False

If the same quantity of thermal energy is added to two different substances with the same mass, the substance with the lower specific heat will experience less of a temperature change. True False

False

The magnetic domain is the area around a magnet where the magnetic force acts. True False

False

The strength of an electromagnet can be increased by reducing the number of turns on the wire coil so that more current can flow. True False

False

When a substance is cooled it usually expands. True False

False

A current-carrying wire produces a magnetic field. True False

True

Compared to water, most metals have low specific heats. True False

True

The more loops in a coil of wire around the core of an electromagnet, the stronger the magnetic force. True False

True

When the amount of positive charge on an object equals the amount of negative charge on an object, the object is electrically neutral. True False

True

When you bring the south ends of two magnets close together, they repel each other. _______________ True False

True

Kinetic energy is the energy of ________.

motion

Which of the following statements about the forces between charged objects is not true? Multiple choice question. A) As the distance between charged objects decreases, the electric force between them decreases. B) If one object is positively charged and another is negatively charged, the objects will attract each other. C) Two negatively charged objects will repel each other. D) As the amount of charge on either object decreases, the electric force between them decreases.

A) As the distance between charged objects decreases, the electric force between them decreases.

Which of the following statements about the particles in a material is true? A) The average kinetic energy of the particles increases as the temperature increases. B) The average kinetic energy of the particles decreases as the temperature increases. C) The average kinetic energy of the particles in a substance never changes. D) There is no relationship between kinetic energy and temperature.

A) The average kinetic energy of the particles increases as the temperature increases.

As a nail approaches the south pole of a magnet, what happens to its magnetic domains? A) The north poles of the domains point toward the magnet. B) The south poles of the domains point toward the magnet. C) The domains spin, but end up in no particular pattern. D) The domains remain unaffected by the magnet.

A) The north poles of the domains point toward the magnet.

You grab a bottle of water out of the refrigerator. Your hand gets cold because of which of the following? A) conduction B) radiation C) convection D) evaporation

A) conduction

If the distance between two charged objects increases, the electric force between them _____. A) decreases B) increases C) remains the same D) stops

A) decreases

The measure of the average kinetic energy of the particles of a substance is its _____. A) temperature B) heat C) thermal energy D) kinetic energy

A) temperature

Devon was watching an old television show about people stranded on an island. One of the characters wanted to make an electric generator out of a bicycle. What does he need to find? Multiple select question. A) two magnets B) a battery C) a coil of wire D) an electromagnet E) a light bulb

A) two magnets C) a coil of wire