Q: What type of radio waves exist in the 540 to 1600 khz frequency range? Read this paragraph and choose the correct option from the provided answers: AM radio waves are used to carry commercial radio signals in the frequency range from 540 to 1600 kHz. The abbreviation AM stands for amplitude modulation, which is the method for placing information on these waves. (See Figure 24.12. ) A carrier wave having the basic frequency of the radio station, say 1530 kHz, is varied or modulated in amplitude by an audio signal. The resulting wave has a constant frequency, but a varying amplitude. A radio receiver tuned to have the same resonant frequency as the carrier wave can pick up the signal, while rejecting the many other frequencies impinging on its antenna. The receiver's circuitry is designed to respond to variations in amplitude of the carrier wave to replicate the original audio signal. That audio signal is amplified to drive a speaker or perhaps to be recorded. Choices: - microwaves - sound waves - fm radio waves - am radio waves A:
am radio waves

Q: What will happen if the gas particles inside an inflated balloon suddenly stop moving? Read this paragraph and choose the correct option from the provided answers: Gas molecules also exert pressure. Earth's atmosphere exerts pressure because gravity acts on the huge number of gas particles contained in the atmosphere, holding it in place. Pressure is also exerted by a small sample of gas, such as that which is contained in a balloon. Gas pressure is the pressure that results from collisions of gas particles with an object. Inside the balloon, the gas particles collide with the balloon's inner walls. It is those collisions which keep the balloon inflated. If the gas particles were to suddenly stop moving, the balloon would instantly deflate. The Figure below is an illustration of gas particles exerting pressure inside a container. Choices: - balloon falls - balloon bursts - balloon inflates - balloon deflates A:
balloon deflates

Q: The right ventricle pumps what type of blood toward the lungs? Read this paragraph and choose the correct option from the provided answers: The right ventricle pumps oxygen-poor blood toward the lungs, where it receives oxygen. Choices: - plasma - oxygenated - oxygen-rich - oxygen-poor A:
oxygen-poor

Q: Energy that is released when a chemical reaction takes place is known as what? Read this paragraph and choose the correct option from the provided answers: Choices: - liquid energy - consequence energy - thermal energy - chemical energy A:
chemical energy