ISA Practice Test (Physical)

The only intermolecular forces acting between the molecules are London dispersion forces. Which conclusion is most consistent with this data?

• London dispersion forces are stronger for more electronegative elements.

• London dispersion forces are stronger for molecules with greater mass.

• London dispersion forces are stronger for elements that have higher ionization energies.

• London dispersion forces are stronger for metals than for nonmetals.

150 units of chemical energy were converted into 35 units of thermal energy, 5 units of sound energy, and x units of radiant energy. What is the value of x?

• 100

• 190

• 40

• 110

Magnet B experiences a larger force from the magnetic field than magnet A does. What causes the difference?

• Magnet A is affected by the battery more than by the coil of wire.

• The magnetic field is stronger at magnet B's location than at magnet A's location.

• The coil of wire increases the strength of magnet B but does not affect magnet A.

• Magnet B is being pushed in different directions by different loops of wire.

When a charged object approaches another object with the same charge, it loses kinetic energy. What happens to this lost kinetic energy?

• It is converted to electrical potential energy.

• It is converted to thermal energy.

• It is converted to light energy.

• It is converted to gravitational potential energy.

What will be the effect on the force between two charged spheres when both the charge on one of the spheres and the distance between them are tripled?

• The force between the charged spheres will be nine times the original force.

• The force between the charged spheres will be three times the original force.

• The force between the charged spheres will be one-ninth of the original force.

• The force between the charged spheres will be one-third of the original force.

Becky is preparing tea. When the water for the tea boils, she pours it in a cup of cold milk. Assuming that the system is closed and that thermal energy distribution is uniform when the hot water mixes with the cold milk, which of the following is true about the thermal energy of each of the liquids in the cup?

• A transfer of thermal energy will not occur between the liquids because the system is closed.

• The thermal energy lost by the hot liquid will be equal to the thermal energy gained by the cold liquid.

• The thermal energy lost by the hot liquid will be more than the thermal energy gained by the cold liquid.

• The thermal energy lost by the hot liquid will be less than the thermal energy gained by the cold liquid.

A scientist performs an experiment in which he launches a metal ball at a wooden target from a fixed distance at the same speed each time. With each collision, the metal ball exerts a force on the target. Each time the ball hits the target, the target moves backward slightly. What should the scientist do to reduce the force on the target?

• make the ball out of a material that will deform on impact

• fix the target in place more securely

• make the metal ball larger

• decrease the distance between the metal ball and target

Which of the following would help balance the forces acting on the painting so that it does not move?

I. Push harder on the painting.

II. Push less hard on the painting.

III. Push upward on the painting.

IV. Push downward on the painting.

• III only

• II and III only

• I and III only

• I and IV only

Radio waves are used to transmit information over long distances. Which statement describes one reason why gamma rays are not used also for communication?

• Gamma rays have such long wavelengths that they would become highly distorted in the atmosphere.

• Gamma rays have such short wavelengths that they would become highly distorted in the atmosphere.

• Gamma rays have such low energy that they cannot pass through solid objects.

• Gamma rays have such high energy that they cannot pass through solid objects

After 20 minutes, Bethany noticed that the skin under the cold pack was cool to the touch. Which statement best explains why?

• The cold pack and Bethany's skin had become closer to the same temperature.

• Both the cold pack and Bethany's skin had lost thermal energy.

• All of the thermal energy in the cold pack had moved to Bethany's skin.

• The cold pack had reduced the temperature of Bethany's skin to 40°F.