- Which of the following measurements contains three significant figures? 0.010 g 0.01010 g 0.0100 g 0.01 g
- 29. According to the inverse square law, the intensity of radiation is __ proportional to the __ from the source of radiation. a. Directly; distance b. Directly; square of the distance c. Inversely; distance d. Inversely; square of the distance A B C D 30. Aluminum filters: a. Remove more penetrating x-rays from the beam b. Decrease the mean penetrating ability of the x-ray beam c. Remove high-energy x-rays from the beam d. Reduce the intensity of the x-ray beam A B C D
- 26. When low kilovoltage peak settings are used (65 to 70kVp) , a film with __ will result. a. High contrast b. Low contrast c. Many shades of gray d. Both a S c A B D 27. The quantity of the x-rays produced is controlled by: a. Voltage b. Kilovoltage c. Kilovoltage peak d. Milliamperage A B C D 28. __ is the overall darkness or blackness of a film. a. Contrast b. Quality c. Density A B
- 24. When the voltage is increased: a. Electrons move from the anode to the cathode with more speed b. Photons move from the anode to the cathode with more speed c. Electrons move from the cathode to the anode with more speed d. Photons move from the cathode to the anode with more speed A B C D 25. The kVp represents: a. The mean x-ray tube voltage b. The mean filament voltage c. The maximum or peak voltage of an alternating current d. The maximum or peak voltage of a direct current A B C D
- 22.The __ is used to decrease the voltage from 110 or 220-line voltage to 3-5 volts used by the filament circuit. a. Step-up transformer b. Step-down transformer c. High voltage circuit A B C 23. In dental radiography.the term __ is used to describe the mean energy or penetrating ability of the x-ray beam. a. Quality b. Quantity c. Intensity d. Wavelength A B C D
