Which statement is true of AC current?. Select one of the options below as your answer:. . A.. It uses a battery as a power source.. B.. It can easily be transformed from high voltages to low voltages.. C.. It is typically low voltage.. D.. the electrons are moving in one direction. E.. It was the first type of electric current invented..
A mass movement that involves the sudden movement of a block of material is called a A. rockfall. B. slide. C. slump. D. flow.
Scientists are concerned about the release of methane from the arctic because _______. a. as a greenhouse gas methane is 20 times more potent than carbon dioxide b. the mass of the arctic’s methane is comparable to that of the Earth’s coal beds c. global warming appears to be accelerating its release d. all of the above
Which of the following activities is most likely to result in nutrient pollution? a. cutting down trees b. pouring motor oil down the drain c. excess fertilizer use d. none of the above Please select the best answer from the choices provided A B C D
A doctor diagnoses a man with an acute strain. Which job is most likely to cause an acute strain? furniture mover bank teller baseball player heart surgeon
Which of the following statements is true about scientific theories? A. Scientific theories become scientific laws. B. Scientific theories are never proven. C. Scientific theories become hypotheses. D. Scientific theories summarize patterns found in nature
22. The main difference between speed and velocity involves A. direction. B. weight. C. distance. D. gravity.
Gamma rays are produced by applying ___________ A.) electric and magnetic fields at right angles to each other B.) electric and magnetic fields parallel to each other C.) crests and troughs at right angles to each other D.) crests and troughs parallel to each other
Which characteristic of life best describes the process of photosynthesis? using energy containing cells reproducing growing and developing
Which unit of pressure is derived from the early barometers used to measure pressure? mmHg bar Pa atm
To calculate the dashed orbits from the stellar positions, astronomers had to assume that __________.
Which statement about tornadoes is correct? a. They are a very common part of thunderstorms. b. Seventy-five percent of the world’s tornadoes occur in the United States. c. Their danger is mainly from the heavy rains they bring. d. They are the strongest storms on Earth.
Developing poise under pressure and building self-esteem are benefits toward your __________. A. mental health B. social health C. physical health D. spiritual health
How do scientists determine the number of neutrons in an isotope of an atom? A. They find the number of protons. B. They divide the atomic mass by two. C. They add the number of electrons and protons. D. They subtract the atomic number from the atomic mass.
Why do underwater objects appear distorted when you see them from above? reflection refraction diffusion diffused reflection specular reflection
The change in the wind patterns on the Earth that causes an increase in ocean temperature is: a. El Niña c. La Niña b. El Niño d. La Niño
Which best defines partial pressure in a mixture of gases? a pressure that is exerted by all the gases of a mixture on the container b pressure that is exerted by one gas as if it occupied a container by itself c half of the pressure that is exerted by the gases of a mixture on the container d sum of the individual pressures that are exerted by two or more gases
Artists Michaelangelo, Raphael, and Leonardo da Vinci belong to which period of the Renaissance? a. Early Renaissance b. High Renaissance c. Late Renaissance
Figure 17-1 shows a wave movement during 1 second. What is the frequency of this wave? A. 2 hertz B. 2 meters/second C. 0.5 second D. 1 hertz Download jpg