Biophysics Data Bank Past Paper 2023-2024 PDF
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Faculty of Dentistry
2024
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This is a biophysics past paper covering topics such as heat capacity, temperature, specific heat, latent heat, and concepts in thermodynamics. The paper includes multiple-choice questions and problems, and may be suitable for an undergraduate level physics course.
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Biophysics Data bank 1. ……………….. a measure of how hot or cold an object is compared to another object. A. Heat capacity B. Temperature C. Specific Heat D. Latent Heat 2. If two objects are in thermal contact and there is no energy exchange the objects are said to be i...
Biophysics Data bank 1. ……………….. a measure of how hot or cold an object is compared to another object. A. Heat capacity B. Temperature C. Specific Heat D. Latent Heat 2. If two objects are in thermal contact and there is no energy exchange the objects are said to be in……………... A. Thermal Equilibrium B. Thermal state C. Heat Exchange D. Energy equilibrium 3. A person with hypothermia has a body temperature of 91.4 °F. its temperature in °C scale is ……………... A. 33.8 °C B. 33 °C C. 68.5°C D. 38.3°C 4. ……………………..The amount of thermal energy required to raise the temperature of an object one degree. A. Latent Heat B. Heat Capacity C. Specific Heat D. Amount of heat 5. …… The amount of thermal energy required to raise the temperature of one gram of a substance one degree. A. Latent Heat B. Heat Capacity C. Specific Heat D. Amount of heat 6. …………….. is the amount of thermal energy required to change the phase of one gram of a substance. A. Latent Heat B. Heat Capacity C. Specific Heat D. Amount of heat 7. In ……………… the flow is caused by differences in density due to thermal expansion, such as hot air rising. A. Natural convection B. Convection C. Forced convection D. Natural and forced convection 8. ………………….. is the transfer of heat by mass motion of a fluid from one region of space to another. A. Natural convection B. Convection C. Forced convection D. Natural and forced convection 9. ……………is the transfer of heat by electromagnetic waves such as visible light, infrared, and ultraviolet radiation. A. Conduction 1 B. Convection C. Radiation D. Natural convection 10. Heat transfer by conducting is characterizing the conducting ……………… A. Gases B. Liquids C. Solids D. Fluids 11. The total energy radiated from an object is directly proportional to the fourth power of its temperature by…………………… A. 𝑃 = 𝛿𝜀𝐴𝑇 4 B. 𝑃 = 𝛿𝐴(𝑇 4 − 𝑇𝑐4 ) C. 𝑃 = 𝛿𝜀𝐴(𝑇 4 − 𝑇𝑐4 ) D. 𝑃 = 𝛿𝜀𝐴(𝑇𝑐4 − 𝑇 4 ) 12. When two gases separated by a diathermal wall are in thermal equilibrium with each other: A. Only their pressure must be the same B. Only their volumes must be the same C. Only their temperature must be the same D. They must have the same pressure and the same volume 13. The normal temperature of a chickadee is 105.8 °F. What is that temperature on the Celsius scale? A. 76.55 B. 132.84 C. 248.04 D. 41 14. On a cold winter day, the temperature is –15 °C. What is that temperature in °F? A. 23.66 B. 30.6 C. 5 D. 9.44 15. What is the temperature of freezing water? A. 0 ⸰F B. 0 ⸰C C. 0 KB D. 100 K 16. The radiated emissivity power ꜫ =1 for ………………… A. Radiated body B. Black Body C. Hot Body D. Normal Body 17. The energy given off as heat by 300g of an alloy as it cools through 50⸰C raises the temperature of 300g of water from 30⸰C to 40⸰C. the specific heat of the alloy (in cal /g. ⸰C) is: A. 0.15 B. 0.20 C. 0.015 D. 0.10 18. As the temperature increases from 0 °C to 4 °C water contracts and its density ……………. 2 A. Decreases B. Increases C. Still constant D. Contract 19. when the pressure of the gas is kept constant, its volume is directly proportional to its temperature this is …… A. Ideal gas Law B. Boyle`s Law C. Charles and Gay-Lussac Law D. General Law of Gases 20. When the gas is kept at a constant temperature, its pressure is inversely proportional to its volume this is ….. A. Ideal gas Law B. Boyle’s law C. Charles and Gay–Lussac Law D. General Law of gases 21. An ideal gas is one for which PV/nT is constant at all …………. A. Volumes B. Temperatures C. Pressures D. All conditions 22. How many Celsius units are between the boiling and freezing points of water? A. 273 B. 180 C. 32 D. 100 23. What is the temperature of boiling water? A. 100 °F B. 32 °F C. 180 °F D. 212 °F 24. The volume thermal expansion coefficient is equal ………………. A. B. C. D. 25. A steel railroad track has a length of 20.000 m when the temperature is 0.0 ⸰C. what is its length when the temperature is 50.0 ⸰C [ =x− (⸰C)-1]. A. 11 m B. 2011 m C. 20.011 Km D. 20033 m 26. ………………………… has only magnitude and no direction. A. A vector quantity B. A physical quantity C. A scalar quantity D. No one 27. If the force is passing through the pivot point the torque is ……….. 3 A. Maximum value B. Minimum value C. Zero D. No one 28. For the static situation the linear and angular velocities must be……... A. Different B. Changed C. Zero D. Equal 29. Pressure is the perpendicular force per unit area its SI unit is Pascal and 1 Pa = ……….. A. 1 N/ m2 B. 1 N/ m C. 1.01x105 𝑵/𝒎2 D. 1.01x105 𝑵/𝒎 30. Cohesive forces between surface molecules cause the surface of a liquid to contract to the smallest possible surface area this general effect is called Surface Tension and given by…………… A. 𝛾 = 𝐹𝐿 B. 𝛾 = 𝐹/𝐿 C. 𝐹 = 𝛾/𝐿 D. 𝐹 = 𝐿/𝛾 31. The tendency of a liquid to be raised or suppressed in a narrow tube is called …………. A. Potential action B. Capillary action C. Axon action D. No one 32. The human Arm is a lever from the ……………… order A. Second B. Third C. First D. Fourth 33. When the cohesion force higher than the adhesion force the liquid does not wet the surface and the contact angle θ is………. A. θ = zero B. θ = 90 C. θ > 90 D. θ < 90 34. When the cohesion force smaller than the adhesion force the liquid does wet the surface and the contact angle θ is………. A. θ =zero B. θ = 90 C. θ > 90 D. θ < 90 35. the human jaw is a lever from the ……………. Order A. Second B. First C. Third 4 D. Fourth 36. The human leg is a lever from the ……………… order A. Second B. First C. Third D. Fourth 37. The scalar product of tow vectors 𝐴⃗&𝐵⃗⃗ is equal ……………… ⃗⃗=AB sin A. 𝐴⃗.𝐵 𝐴⃗.𝐵 ⃗⃗ cos ⃗⃗=𝐴⃗𝐵 C. 𝐴⃗.𝐵 ⃗⃗=|𝐴||𝐵| D. 𝐴⃗.𝐵 ⃗⃗= |𝐴||𝐵|𝐶𝑜𝑠 𝜃 38. The work W done on a system by an agent exerting a constant force on the system given by ……….. A. 𝑊 = 𝐹∆𝑟𝑐𝑜𝑠 𝜃 = 𝐹. ∆𝑟 B. 𝑊 = 𝐹∆𝑟𝑐𝑜𝑠 𝜃 = 𝐹𝑥∆𝑟 C. 𝑊 = 𝐹∆𝑟𝑠𝑖𝑛 𝜃 = 𝐹. ∆𝑟 D. 𝑊 = 𝐹∆𝑟𝑠𝑖𝑛 𝜃 = 𝐹𝑥∆𝑟 39. Viruses, bacteria, mitochondria and animal and plant cells we can see them by ……………. A. X-ray crystallography B. Electron microscopy C. Human eyes D. No one 40. Paramecium and human egg we can see them by ……………. A. X-ray crystallography B. Conventional light microscopy C. Human eyes D. No one 41. Liver, Brain and Heart we can see them by ………………... A. X-ray crystallography B. Electron microscopy C. Human eyes D. No one 42. Atoms and proteins we can investigate their structure by………… A. X-ray crystallography B. Electron microscopy C. Human eyes D. Magnifier 43. ………………. of a substance is the amount that consist Avogadro's number (NA=6.02×1023 atoms/mole) of atoms or molecules of this substance. A. One gram B. One atomic number C. One atomic weight D. One mole 5 44. The magnitude of torque (𝜏̃ ) equals the applied force (F) times the length of arm (r) that is perpendicular to the applied force given by………… A. |𝜏̃ |= |F. r| = 𝑟𝐹 cos 𝜃 B. |𝜏̃ |= |F. r| = 𝑟𝐹 sin 𝜃 C. |𝜏̃ |= |F × r| = 𝑟𝐹 cos 𝜃 D. |𝜏̃ |= |F × r| = 𝑟𝐹 sin 𝜃 45. ……………… the point at which the mass of an object is considered to be concentrated. A. Center of gravity B. Center of Mass C. Center of curvature D. No one 46..........................transmit the force with an unchanged direction. A. Liquids B. Solids C. Gases D. Fluids 47. …………….. transmit force in all directions. A. Liquids B. Solids C. Gases D. Fluids 48. ……………. characterized by structural rigidity and resistance to a force applied to the surface. A. Liquids B. Solids C. Gases D. Fluids 49. …………….. that continuously deforms under an applied shear stress, or external force. A. Crystals B. Solids C. polymers D. Fluids 50. A living room has floor dimensions of 3.5 m and 4.2 m and a height of 2.4 m. (a) What does the air (𝜌air=1.21 kg/m3) in the room weight when the air pressure is 1.0 atm? A. W = 418.35 N B. W = 28.46 N C. W = 24.45x106N D. W = 4.89 x 106N 51. Estimate the force exerted on your eardrum due to the water when you are swimming at the bottom of a pool that is 5.0 m deep and surface area of the eardrum 1 cm2. A. F = 50 KN B. F = 5 N C. F = 60.1 N D. F = 60.1 KN 6 52. ……………….. state that a change in pressure applied to an enclosed fluid is transmitted to all portions of the fluid and to the walls of its container. A. Archimedes Principle B. Pascal`s Principle C. Stefan Boltzmann Principle D. Bernoulli’s Principle 53. ………is like the brick – the basic building block of a house A. Base quantity B. Derived quantity C. Scalar quantity D. Vector quantity 54. ………….. is like the house that was build up from a collection of bricks. A. Base quantity B. Derived quantity C. Scalar quantity D. Vector quantity True or false 55. When the Cohesion is higher than adhesion the contact angle is less than 90⸰.(F) 56. When the Cohesion is less than adhesion the contact angle is less than 90⸰.(T) 57. When the Cohesion is higher than adhesion the contact angle is higher than 90⸰. (T) 58. Torque is zero if the force is passing through the pivot point (T) 59. For static equilibrium, the resultant external force must equal zero:∑ F = 0(T) 60. The center of mass must be below the base support and inside the base (F) 61. The force of the muscle does not depend on the number of fibers contracting the muscle. (F) 62. In the triceps two tendons join the muscle to the bone. (F) 63. The continuity equation of the liquid flow during a pipe state that 𝐴1 𝑣1 = 𝐴2 𝑣2 (T) 64. Venturi meter It is a device that is based on Bernoulli’s theorem and is used for measuring the rate of flow of liquid through the pipes. (T) 65. According to Bernoulli`s equation the narrower the tube, the faster the liquid. So, the kinetic energy increases 1 as well 𝑃 +2 𝜌𝑣 2 + 𝜌𝑔ℎ = constant (T) 66. The force required for a constant speed in the viscus medium given by 𝐹 = 𝜂 𝑣𝐴⁄𝑙 (T) 67. Shape of the object determines how the forces is acting (T) 68. displacement is the longest path covered by a body during its motion. (F) 69. distance is the total path covered by a body during its motion. (T) 70. the direction of the torque can be obtained by the left-hand. (T) 71. the shape of the object determines how the forces is acting. (T) 72. An ideal absorber is also an ideal radiator of energy. (T) 73. An ideal gas is one for which PV/nT is constant at all pressures. (T) ابلتوفيق ابنايئ وطاليب العزاء مع خالص متنيايت ابلتوفيق ان شاء هللا عصام فضل أبوزيد/ د.أ 7