IPC Semester Exam Part 2

The gravitational potential energy of an object on the Earth is dependent on the object's —

• acceleration

• velocity

• momentum

• position

Lee wants to construct an electrical generator. He has a bar magnet. What other component does Lee need for his generator?

• Cotton twine

• Copper wire

• An iron rod

• A battery

When an electric lamp is turned on, electrical energy is —

• transformed

• destroyed

• created

• absorbed

Which of the following occurs as the potential energy of an object decreases?

• Its kinetic energy increases.

• Its thermal energy decreases.

• Its chemical energy increases.

• Its magnetic energy decreases.

Heat is transferred from the sun to Earth by —

• conduction

• convection

• fusion

• radiation

Sound waves are examples of which type of wave?

• longitudinal wave

• transverse wave

• electromagnetic wave

• seismic wave

Equal drops of red food coloring are added to two cups of water. One cup is very hot, and the other is ice-cold. The color spreads faster in the very hot water. The color spreads faster due to —

• compression

• condensation

• conduction

• convection

A roller coaster car at the top a hill has 30 Joules (J) of potential energy and 0 J of kinetic energy. At the bottom of the hill, the car has 30 J of kinetic energy and 0 J of potential energy. Which principle does the roller coaster car demonstrate?

• Conservation of energy

• Conservation of gravity

• Conservation of mass

• Conservation of speed

Geothermal sources of heat are used to help boil water for steam-powered electricity generators. Which of the following would most increase the efficiency of the systems?

• building a large water reservoir

• increasing the temperatures of the boilers

• adding more generators so that each does less work

• insulating the hot water system from the environment

A metal spoon placed in a cup of hot cocoa becomes hot. Which process transfers heat from the bowl of the spoon to the handle?

• conduction

• convection

• evaporation

• radiation