Clover Learning Physics Practice Test

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• Which tissue or material corresponds to the highest signal intensity at the image receptor?
• What is the centripetal acceleration for a vehicle moving at 20 m/s around a circular path of radius 40 m?
• If a wall experiences the same ΔT, what is the conduction rate change when the area is doubled and the thickness is halved?
• Two coherent sources separated by a distance such that at a point their path difference is equal to one wavelength. What kind of interference occurs there?
• A wheel of radius 0.5 m has an angular acceleration of 2 rad/s^2 and starts from rest. After 3 s, what is its angular velocity?
• How is detector element (DEL) pitch defined?
• If magnification factor equals SID/SOD and SID is 50 inches with a magnification of 1.25, what is the SOD?
• A person pushes on a wall with a force of 200 N. What force does the wall exert on the person?
• How many pixels are in a 2MP (megapixel) monitor?
• If the SID doubles while the SOD remains constant, what happens to the magnification factor?
• What defines low contrast?
• A 0.5 kg block of ice at 0°C is heated and completely melts. If the latent heat of fusion is 334 kJ/kg, how much energy is required?
• A capacitor stores charge Q = 3 μC at V = 6 V. What is its capacitance?
• Which statement describes low-contrast images?
• A 2 kg block is lifted by 5 m. What work is done against gravity?
• For imaging the thoracic spine, which projection provides increased spatial resolution and decreased OID?
• Which factor, when high, contributes to achieving the highest spatial resolution alongside small DEL size and small DEL pitch?
• In a chest exposure, the large difference in signal intensities within the remnant beam is described as?
• Which statement best describes the relationship between OID and spatial resolution?
• A position-time graph is a straight line with slope 4 m/s. What is the object's velocity?
• A 2.0 kg cart is released from rest at a height of 0.8 m on a frictionless track. Ignore air resistance. What speed does it reach at the bottom?
• What kind of image contrast do large signal differences in the remnant beam produce?
• What are the two benefits of performing a thoracic spine in an AP projection instead of a PA projection?
• Two equal masses m = 1 kg, one moving at 2 m/s collides elastically with the other at rest along the same line. After collision, what are their velocities?
• What are the four patient factors related to spatial resolution?
• What term describes the smallest unit of information within a digital image?
• How is image contrast defined?
• Two coherent sources separated by distance such that at a point they have a path difference of λ/2. What kind of interference occurs there?
• Which projection uses elongation to improve visualization of the calcaneus?
• A car makes a horizontal circular path of radius 50 m at a constant speed of 15 m/s. What is the centripetal acceleration?
• Which part of the x-ray beam contains signal intensities corresponding to the anatomy represented on the image receptor?
• In a one-dimensional elastic collision between a 3 kg block moving at 2 m/s and a stationary 4 kg block, what are their velocities after collision?
• How is spatial resolution measured?
• Two point charges q1 = 2 μC and q2 = -3 μC are separated by r = 0.05 m. What is the electric potential energy of the system? (Use k = 8.99×10^9 N·m^2/C^2.)
• For two point charges of opposite sign, the electric potential energy of the system is
• At constant volume, if the pressure of a gas doubles, what happens to the temperature (in terms of the initial temperature T1)?
• What does DEL stand for in digital radiography?
• Which statement best describes the relationship between monitor pixel count and spatial resolution?
• Which aspects of the image receptor influence spatial resolution?
• A light ray travels from air into water with angle of incidence 30 degrees. Using Snell's law, what is the angle in water?
• What is long gray-scale synonymous with?
• A 0.5 kg piece of metal with c = 400 J/kg·K is heated by 200 K. How much energy is added?
• How do ascites affect the subject contrast of the abdomen?
• A single loop of wire with N = 1 is exposed to a uniform magnetic field changing such that the flux Φ = B A; If B is increasing at rate dB/dt = 0.8 T/s and area A = 0.5 m^2, what is the induced emf?
• What primarily controls the display monitor spatial resolution?
• What SID is considered the standard baseline to minimize magnification in radiography?
• What is the magnification factor when SID is 42 inches and OID is 10 inches?
• What are three factors that affect spatial resolution in digital radiography?
• Which DEL size provides higher spatial resolution: 0.1 mm or 0.5 mm?
• Which projection reduces OID and improves spatial resolution for thoracic imaging?
• What is the average velocity during the 5 s interval of the velocity ramp from 0 to 20 m/s?
• How does decreased matrix size affect the spatial resolution of a digital image?
• Which statement is true about matrix size and spatial resolution?
• Which skull projection is used to produce elongation with an axial angle?
• Which combination of factors produces an image with the highest spatial resolution?
• What happens to the size of individual pixels when the matrix size decreases?
• What is the formula for calculating the source-to-object distance (SOD)?
• How does increased kilovoltage peak (kVp) affect the proportion of scatter radiation striking the image receptor?
• Which projection of the calcaneus uses a 40-degree angle to produce elongation?
• A wheel with radius 0.5 m and angular velocity 6 rad/s is rolling without slipping. What is the linear velocity of the center of mass?
• A capacitor with capacitance C = 0.5 μF is charged to voltage V = 6 V. What is the energy stored in the capacitor?
• In a one-dimensional elastic collision, a 5 kg block moving at 2 m/s collides with a stationary 1 kg block. What are their velocities after collision?
• If 10 J of work is done in 2 s, what is the average power?
• A force of 50 N is applied uniformly on an area of 0.01 m^2. What is the pressure?
• In a closed system, the total electric charge is conserved. If the system is initially neutral, what is the total charge after any process within the system?
• If intensity is 1×10^-6 W/m^2 and reference intensity is 1×10^-12 W/m^2, what is the sound level β?
• Which formula is used to determine the magnification factor in radiography?
• A wave has frequency f = 5 Hz and wavelength λ = 60 m in a medium. What is the wave speed c?
• To increase scatter reaching the image receptor, which change would be most effective?
• What is used to test a monitor's spatial resolution?
• A cube of side length 2 m has mass 56 kg. What is its density?
• A resistor of 12 Ω carries a current of 2 A. What is the voltage across it?
• What is the purpose of decreasing focal spot size in radiography?
• What defines high contrast?
• Which image quality factor is defined as the structural sharpness recorded in the radiographic image?
• What is the primary factor controlling subject contrast?
• Which statement is true regarding grid ratios and image contrast?
• Between 0.5 mm and 0.1 mm DELs, which provides higher spatial resolution?
• What type of shape distortion results when the anatomy is parallel to the IR but the x-ray beam is angled?
• Which combination of SID and OID produces the highest quality radiograph?
• Which grid ratio is associated with the highest image contrast?
• Which post-processing factor affects the displayed image contrast?
• In a patient with ascites, the decreased subject contrast likely leads to what effect on visibility of anatomical detail?
• A force of 8 N is applied at a point 0.2 m from the pivot, perpendicular to the lever arm. What is the torque? If the body has moment of inertia I = 0.4 kg·m^2, what angular acceleration does this torque produce?
• What describes the contrast and brightness calibration of the display monitor?
• If the distance from a point charge is doubled, how does the electric field change relative to its original value?
• Which monitor size is the minimum recommended by the American College of Radiology (ACR) for routine radiography?
• Three resistors 3 Ω, 2 Ω, and 5 Ω are in series connected to a 20 V source. What is the current, and what is the voltage drop across the 5 Ω resistor?
• What term describes the smallest unit of information within a digital image?
• Which term describes the standard used to map computed radiography grayscale levels to a perceptually uniform display on monitors?
• What is the distance between the anatomy being imaged and the focal spot within the x-ray tube called?
• Which magnification factor results in the greatest amount of size distortion?
• Which statement best describes the effect of increasing matrix size on pixel size when the overall field of view is kept constant?
• Which computer processing features influence radiographic image contrast?
• A 0.3 kg piece of metal with specific heat capacity c = 500 J/kg·K is heated by 100 K. How much energy is added?
• A 2.0 kg block of water at 20°C is heated to 30°C. With c = 4184 J/kg·K, how much energy is added?
• Which of the following is not listed as a patient-related factor affecting spatial resolution?
• A thin converging lens has focal length f = 0.20 m. An object is placed at distance u = 0.30 m from the lens. Use the lens formula 1/f = 1/v + 1/u to find the image distance.
• Which parameter, when increased, contributes to both decreased spatial resolution and increased penumbra?
• How many shades of gray can one monitor pixel display at a time?
• If you keep SID constant but reduce OID significantly, what happens to magnification?
• What is the term for blurring at the edges of an object on a radiograph?
• Which of the following is the unit of capacitance?
• Which set of DEL characteristics would most likely provide the best spatial resolution?
• What type of shape distortion occurs when the bone is angled but the central ray is perpendicular?
• How can a technologist reduce magnification when a long OID is unavoidable?
• Which arrangement yields elongation when the anatomy is parallel to the image receptor and the beam is angled?
• A wall has thickness L = 0.05 m, cross-sectional area A = 2.0 m^2, thermal conductivity k = 0.8 W/m·K, and ΔT = 20 K across it. What is the rate of heat transfer by conduction?
• Which change would most directly improve spatial resolution of the imaging system?
• A 1.0 kg object moves at 1.0 m/s. What is its momentum?
• Increasing which factor related to distance will increase spatial resolution?
• A 1.0 kg object moves at 1.0 m/s. What is its de Broglie wavelength?
• A charge q = 2 μC moves with velocity v = 3×10^5 m/s perpendicular to a uniform magnetic field B = 0.5 T. What is the magnetic force on the charge?
• If 1 μg of mass is converted completely to energy, what is the energy released? Use c = 3.0×10^8 m/s.
• A point charge q = 5 μC is located at r = 0.2 m away from a point of interest. Assuming vacuum permittivity, what is the magnitude of the electric field due to this charge at that point?
• Which term describes the light-emitting components within display monitors?
• Which feature of abdominal radiographs can make visualization of individual anatomy and pathology more difficult?
• What is another term for size distortion?
• If the current in a long straight wire doubles, what happens to the magnetic field at a fixed distance?
• A 5 kg object moves with velocity 8 m/s. What is its kinetic energy?
• How does increased matrix size affect the spatial resolution of a digital image?
• Which projection results in foreshortening of the anatomy?
• If you decrease the source-to-image distance (SID), what happens to spatial resolution?
• A 1500 kg car travels around a level curve of radius 40 m at 20 m/s. What friction force is required to provide the centripetal acceleration?
• Which image processing factor influences radiographic image contrast?
• What happens to spatial resolution if OID is increased?
• A block of mass 5 kg has density 600 kg/m^3 and is submerged in water (density 1000 kg/m^3). What fraction of its volume is submerged?
• Which statement best describes high contrast?
• Why does increasing subject contrast improve the visibility of anatomy and pathology?
• Which DEL size is preferred to improve spatial resolution and visualize fine details like fractures?
• A block of ice melts completely with mass 0.75 kg using Lf = 334 kJ/kg. How much energy is required?
• lp/mm stands for line pairs per millimeter. Which option correctly expands 'lp'?
• A 3 kg block moving at 2 m/s collides elastically with a stationary 1 kg block. After the collision, what are the velocities of the two blocks?
• Which distance factor, when increased, will increase spatial resolution?
• If SID is 60 inches and SOD is 45 inches, what is the magnification factor?
• Which statement describes a radiographic histogram in simple terms?
• What do large visible differences in brightness represent?
• Pneumothorax on a chest radiograph most directly increases subject contrast due to air in the pleural space; which statement best describes this effect?
• What is the visual appearance of patient motion on a radiograph?
• A torque of 2 N·m is applied to a body with moment of inertia 0.4 kg·m^2. What angular acceleration is produced?
• Which combination of OID and SID produces the highest spatial resolution: 1 inch OID/72 inch SID or higher OID/lower SID?
• How does an increased grid ratio affect radiographic image contrast?
• Which cranium projection results in elongation of the anatomy?
• What term describes the signal differences in the remnant beam?
• What is the effect of decreasing kilovoltage peak (kVp) on the remnant beam signal differences between tissues?
• Which law relates induced emf to rate of change of magnetic flux?
• In the photoelectric effect, if you increase the light intensity while the frequency is above threshold, what happens to the number of emitted electrons and to their maximum kinetic energy?
• When the magnetic flux through a loop increases, the induced current flows such that its own magnetic field opposes this increase. What is the rule called?
• If an image shows long gray-scale and many shades of gray, what is the implied contrast level?
• How does increasing the source-to-image distance (SID) affect size distortion in radiography?
• Which matrix size is associated with the highest spatial resolution: 1024 x 1024 or 2048 x 2048 matrix?
• How does decreased kilovoltage peak (kVp) affect differences in signal intensity in the remnant beam?
• Which expression gives the magnetic field around a long straight wire carrying current I at distance r?
• Which projection is known to produce elongation of the skull when using an axial angle?
• What is the effect of a longer object-to-image distance (OID) on magnification?
• Two resistors 6 Ω and 3 Ω are in parallel across a 12 V source. What is the equivalent resistance and current from the source?
• Differential attenuation describes what?
• What are the two specific types of shape distortion?
• What is a radiographic histogram?
• What is the magnification factor formula when using image size and object size?
• What is the most important factor influencing the contrast of the radiographic image?
• For an imaging setup with a 2 mm effective focal spot, 2-inch OID, and 40-inch SID, what is the focal spot blur?
• Which angle is not considered part of beam geometry?
• What is the distance between the x-ray source and the object called?
• A person pushes on a wall with a force of 200 N. What force does the wall exert on the person?
• What does subject contrast in radiography refer to?
• A car starts from rest and accelerates at 4 m/s^2 for 6 s. What is its final velocity and the displacement during that interval?
• Beam geometry in radiographic imaging is defined by which three factors?
• If the plate area of a parallel plate capacitor is doubled while the separation remains the same, what happens to its capacitance?
• How can a technologist improve spatial resolution with respect to focal spot size?
• How does an increased object-to-image distance (OID) caused by a fracture affect the resulting radiograph?
• Which term describes image magnification?
• Which factor will produce a monitor capable of displaying greater spatial resolution?
• A rod of length 1.0 m has a linear expansion coefficient α = 12×10^-6 /°C. If the temperature increases by ΔT = 30°C, by how much does the length change?
• Which statement is true regarding the relationship between matrix size and pixel size when the overall field of view is fixed?
• If the detector element (DEL) size is decreased while keeping pitch constant, what is the expected effect on spatial resolution?
• A wheel with angular acceleration 2 rad/s^2 starts from rest. What is the linear acceleration of the center of mass if the wheel rolls without slipping?
• Which change is most likely to increase radiographic image contrast?
• An RC circuit has R = 1 kΩ and C = 10 μF. What is the time constant τ, and what is the meaning?
• What type of distortion is caused by angulation of the image receptor?
• Which pathological condition is most likely to increase subject contrast during a chest radiograph?
• How does an air-filled bowel obstruction affect the subject contrast of the abdomen?
• In a clavicle radiograph, switching from AP to PA projection increases spatial resolution primarily due to which factor?
• Which focal spot size yields the highest spatial resolution: 0.6 mm or 2.0 mm?
• A magnification factor of 2.56 implies what about the image size relative to the object?
• For light going from water to air, what is the critical angle in water for total internal reflection?
• A heat engine operates between a hot reservoir at 500 K and a cold reservoir at 300 K. What is the maximum theoretical efficiency?
• Which two variables affect the spatial resolution recorded in the radiographic image?
• How does increased kilovoltage peak (kVp) affect differential attenuation of the x-ray beam?
• What DEL pitch size is preferred to increase spatial resolution?
• Which material tends to produce the lowest remnant beam signal due to high attenuation properties?
• At constant volume, if a gas's pressure doubles, what happens to its temperature? (Assume ideal gas behavior.)
• If the distance from a point charge is doubled, the electric field becomes which of the following relative to its original value?
• Which object-to-image distance (OID) causes the greatest amount of penumbra: 0.5 inches or 2.0 inches?
• A long straight wire carries a current of 5 A. At a distance of 3 cm, what is the magnetic field? Use μ0 = 4π×10^-7.
• What are the two effects of increasing the object-to-image distance (OID)?
• Which clinical finding would most likely decrease subject contrast on an abdominal radiograph?
• Which image quality factor is defined as the structural sharpness recorded in a radiographic image?
• Shape distortion is related to misalignment or angulation of which three components?
• What are the two effects of decreasing the source-to-image distance (SID)?
• What is gray-scale?
• Which projection is associated with elongation of the skull when an axial angle is used?
• Which anatomical part can indicate the spatial resolution recorded in a radiographic image?
• What term describes a body section that creates a remnant beam with widely varying signal intensities?
• A wave has frequency f = 4 Hz and wavelength λ = 12 m in a medium. What is the wave speed c?
• To maximize sharpness, which change would be true?
• A 3 kg mass is raised by 4 m. What is the gain in gravitational potential energy (g = 9.8 m/s^2)?
• A radioactive sample has a half-life of 3 years. What fraction remains after 9 years?
• A projectile is launched from ground level with speed 20 m/s at 30° above the horizontal. Ignoring air resistance, what is its horizontal range?
• A parallel plate capacitor has plate area 0.01 m^2 and plate separation 0.02 m. What is its capacitance in farads? ε0 = 8.85×10^-12 F/m.
• Which situation results in the greatest amount of shape distortion?
• Which body habitus would result in the largest object-to-image distance (OID) during an abdomen radiograph?
• Which two projections use shape distortion (elongation) to improve visualization?
• What two methods should technologists use to prevent motion on a radiograph?
• What happens to the size of individual pixels when the matrix size of a digital image increases?
• What are the two components of image distortion?
• Which factor should be adjusted to visualize fine fractures more clearly in digital radiography?
• Which component of digital radiography receptors is responsible for capturing the radiation signal transmitted through the patient?
• The intensity of sound is 1×10^-4 W/m^2. If the threshold I0 is 1×10^-12 W/m^2, what is the sound level in decibels, β?
• What is the result of increasing object-to-image distance (OID)?