Tiêu đề 12. Thermometry Easy.pdf ✅

1. On the Celsius scale the absolute zero of temperature is at (a) 0°C (b) – 32°C (c) 100°C (d) – 273.15°C 2. Oxygen boils at – 183°C. This temperature is approximately (a) 215°F (b) – 297°F (c) 329°F (d) 361°F 3. Recently, the phenomenon of superconductivity has been observed at 95 K. This temperature is nearly equal to (a) – 288°F (b) – 146°F (c) – 368°F (d) +178°F 4. The temperature of a substance increases by 27°C. On the Kelvin scale this increase is equal to (a) 300 K (b) 2.46 K (c) 27 K (d) 7 K 5. The resistance of a resistance thermometer has values 2.71 and 3.70 ohm at 10°C and 100°C. The temperature at which the resistance is 3.26 ohm is (a) 40°C (b) 50°C (c) 60°C (d) 70°C 6. No other thermometer is as suitable as a platinum resistance thermometer to measure temperature in the entire range of (a) 0°C to 100°C (b) 100°C to 1500°C (c) – 50°C to +350°C (d) – 200°C to 600°C 7. The temperature of the sun is measured with (a) Platinum thermometer (b) Gas thermometer (c) Pyrometer (d) Vapours pressure thermometer 8. Absolute temperature can be calculated by (a) Mean square velocity (b) Motion of the molecule (c) Both (a) and (b) (d) None of the above 9. Thermoelectric thermometer is based on (a) Photoelectric effect (b) Seeback effect (c) Compton effect (d) Joule effect 10. Maximum density of H2O is at the temperature (a) 32°F (b) 39.2°F (c) 42°F (d) 4°F 11. The study of physical phenomenon at low temperatures (below liquid nitrogen temperature) is called (a) Refrigeration (b) Radiation (c) Cryogenics (d) Pyrometry 12. ‘Stem Correction’ in platinum resistance thermometers are eliminated by the use of (a) Cells (b) Electrodes (c) Compensating leads (d) None of the above 13. The absolute zero is the temperature at which (a) Water freezes (b) All substances exist in solid state (c) Molecular motion ceases (d) None of the above 14. Absolute scale of temperature is reproduced in the laboratory by making use of a (a) Radiation pyrometer (b) Platinum resistance thermometer (c) Constant volume helium gas thermometer (d) Constant pressure ideal gas thermometer 15. Absolute zero (0 K) is that temperature at which (a) Matter ceases to exist (b) Ice melts and water freezes (c) Volume and pressure of a gas becomes zero (d) None of these 16. On which of the following scales of temperature, the temperature is never negative (a) Celsius (b) Fahrenheit (c) Reaumur (d) Kelvin 17. The temperature on Celsius scale is 25°C. What is the corresponding temperature on the Fahrenheit scale (a) 40°F (b) 77°F (c) 50°F (d) 45°F 18. One quality of a thermometer is that its heat capacity should be small. If P is a mercury thermometer, Q is a resistance thermometer and R thermocouple type then (a) P is best, R worst (b) R is best, P worst (c) R is best, Q worst (d) P is best, Q worst 19. Two thermometers are used to record the temperature of a room. If the bulb of one is wrapped in wet hanky (a) The temperature recorded by both will be same (b) The temperature recorded by wet-bulb thermometer will be greater than that recorded by the other (c) The temperature recorded by dry-bulb thermometer will be greater than that recorded by the other (d) None of the above
20. The temperature of a body on Kelvin scale is found to be x K. When it is measured by Fahrenheit thermometer, it is found to be x°F, then the value of x is (a) 40 (b) 313 (c) 574.25 (d) 301.25 21. A centigrade and a Fahrenheit thermometer are dipped in boiling water. The water temperature is lowered until the Fahrenheit thermometer registers 140°. What is the fall in temperature as registered by the Centigrade thermometer (a) 30° (b) 40° (c) 60° (d) 80° 22. At what temperature the centigrade (Celsius) and Fahrenheit, readings are the same (a) – 40° (b) + 40° (c) 36.6° (d) – 37° 23. Standardisation of thermometers is obtained with (a) Jolly’s thermometer (b) Platinum resistance thermometer (c) Thermocouple thermometer (d) Gas thermometer 24. The gas thermometers are more sensitive than liquid thermometers because (a) Gases expand more than liquids (b) Gases are easily obtained (c) Gases are much lighter (d) Gases do not easily change their states 25. Mercury thermometers can be used to measure temperatures upto (a) 100°C (b) 212°C (c) 360°C (d) 500°C 26. A constant volume gas thermometer shows pressure reading of 50cm and 90cm of mercury at 0°C and 100°C respectively. When the pressure reading is 60 cm of mercury, the temperature is (a) 25°C (b) 40°C (c) 15°C (d) 12.5°C 27. Mercury boils at 367°C. However, mercury thermometers are made such that they can measure temperature up to 500°C. This is done by (a) Maintaining vacuum above mercury column in the stem of the thermometer (b) Filling nitrogen gas at high pressure above the mercury column (c) Filling nitrogen gas at low pressure above the mercury level (d) Filling oxygen gas at high pressure above the mercury column 28. A device used to measure very high temperature is (a) Pyrometer (b) Thermometer (c) Bolometer (d) Calorimeter 29. The absolute zero temperature in Fahrenheit scale is (a) – 273°F (b) – 32°F (c) – 460°F (d) – 132°F 30. A constant pressure air thermometer gave a reading of 47.5 units of volume when immersed in ice cold water, and 67 units in a boiling liquids. The boiling point of the liquid will be (a) 135°C (b) 125°C (c) 112°C (d) 100°C 31. If a thermometer reads freezing point of water as 20°C and boiling point as 150°C, how much thermometer read when the actual temperature is 60°C (a) 98°C (b) 110°C (c) 40°C (d) 60°C 32. If temperature of an object is 140°F, then its temperature in centigrade is (a) 105°C (b) 32°C (c) 140°C (d) 60°C 33. Of the following thermometers, the one which can be used for measuring a rapidly changing temperature is a (a) Thermocouple thermometer (b) Gas thermometer (c) Maximum resistance thermometer (d) Vapours pressure thermometer 34. On centigrade scale the temperature of a body increases by 30 degrees. The increase in temperature on Fahrenheit scale is (a) 50° (b) 40° (c) 30° (d) 54° 35. The correct value of 0°C on Kelvin scale will be (a) 273.15 K (b) 273.00 K (c) 273.05 K (d) 273.63 K 36. When a copper ball is heated, the largest percentage increase will occur in its (a) Diameter (b) Area (c) Volume (d) Density
37. A vertical column 50 cm long at 50°C balances another column of same liquid 60 cm long at 100°C. The coefficient of absolute expansion of the liquid is (a) 0.005/°C (b) 0.0005/°C (c) 0.002/°C (d) 0.0002/°C 38. The apparent coefficient of expansion of a liquid when heated in a copper vessel is C and when heated in a silver vessel is S. If A is the linear coefficient of expansion of copper, then the linear coefficient of expansion of silver is (a) 3 C + S − 3A (b) 3 C + 3A − S (c) 3 S + 3A −C (d) 3 C + S + 3A 39. A uniform metal rod is used as a bar pendulum. If the room temperature rises by 10°C, and the coefficient of linear expansion of the metal of the rod is 2  10–6 per °C, the period of the pendulum will have percentage increase of (a) – 2  10–3 (b) – 1  10–3 (c) 2  10–3 (d) 1  10–3 40. A bar of iron is 10 cm at 20°C. At 19°C it will be ( of iron = 11  10–6 /°C) (a) 11  10–6 cm longer (b) 11  10–6 cm shorter (c) 11  10–5 cm shorter (d) 11  10–5 cm longer 41. When a rod is heated but prevented from expanding, the stress developed is independent of (a) Material of the rod (b) Rise in temperature (c) Length of rod (d) None of above 42. Expansion during heating (a) Occurs only in solids (b) Increases the weight of a material (c) Decreases the density of a material (d) Occurs at the same rate for all liquids and solids 43. On heating a liquid of coefficient of cubical expansion  in a container having coefficient of linear expansion  / 3, the level of liquid in the container will (a) Rise (b) Fall (c) Will remain almost stationary (d) It is difficult to say 44. A pendulum clock keeps correct time at 0°C. Its mean coefficient of linear expansions is  / C , then the loss in seconds per day by the clock if the temperature rises by t°C is (a) 2 1 864000 2 1 t t   −  (b) 86400 2 1  t  (c) 2 2 1 86400 2 1       −  t t   (d) 2 1 86400 2 1 t t   +  45. When a bimetallic strip is heated, it (a) Does not bend at all (b) Gets twisted in the form of an helix (c) Bend in the form of an arc with the more expandable metal outside (d) Bends in the form of an arc with the more expandable metal inside 46. A solid ball of metal has a concentric spherical cavity within it. If the ball is heated, the volume of the cavity will (a) Increase (b) Decrease (c) Remain unaffected (d) None of these 47. A litre of alcohol weighs (a) Less in winter than in summer (b) Less in summer than in winter (c) Some both in summer and winter (d) None of the above 48. 5 litre of benzene weighs (a) More in summer than in winter (b) More in winter than in summer (c) Equal in winter and summer (d) None of the above 49. Water has maximum density at (a) 0°C (b) 32°F (c) – 4°C (d) 4°C 50. At some temperature T, a bronze pin is a little large to fit into a hole drilled in a steel block. The change in temperature required for an exact fit is minimum when (a) Only the block is heated (b) Both block and pin are heated together (c) Both block and pin are cooled together (d) Only the pin is cooled 51. If the length of a cylinder on heating increases by 2%, the area of its base will increase by (a) 0.5% (b) 2% (c) 1% (d) 4%
52. The volume of a gas at 20°C is 100 cm3 at normal pressure. If it is heated to 100°C, its volume becomes 125 cm3 at the same pressure, then volume coefficient of the gas at normal pressure is (a) 0.0015/°C (b) 0.0045/°C (c) 0.0025/°C (d) 0.0033/°C 53. The coefficient of superficial expansion of a solid is 2  10–5 /°C. It's coefficient of linear expansion is (a) 4  10–5 /°C (b) 3  10–5 /°C (c) 2  10–5 /°C (d) 1  10–5 /°C 54. Density of substance at 0°C is 10 gm/cc and at 100°C, its density is 9.7 gm/cc. The coefficient of linear expansion of the substance will be (a) 102 (b) 10–2 (c) 10–3 (d) 10–4 55. Coefficient of real expansion of mercury is 0.18  10–3 /°C. If the density of mercury at 0°C is 13.6 gm/cc. its density at 473K is (a) 13.11 gm/cc (b) 26.22 gm/cc (c) 52.11 gm/cc (d) None of these 56. The real coefficient of volume expansion of glycerin is 0.000597 per°C and linear coefficient of expansion of glass is 0.000009 per°C. Then the apparent volume coefficient of expansion of glycerin is (a) 0.000558 per°C (b) 0.00057 per°C (c) 0.00027 per°C (d) 0.00066 per°C 57. A beaker is completely filled with water at 4°C. It will overflow if (a) Heated above 4°C (b) Cooled below 4°C (c) Both heated and cooled above and below 4°C respectively (d) None of the above 58. The volume of a metal sphere increases by 0.24% when its temperature is raised by 40°C. The coefficient of linear expansion of the metal is .......... °C (a) 2  10–5 (b) 6  10–5 (c) 2.1  10–5 (d) 1.2  10–5 59. Ratio among linear expansion coefficient (), areal expansion coefficient () and volume expansion coefficient () is (a) 1 : 2 : 3 (b) 3 : 2 : 1 (c) 4 : 3 : 2 (d) None of these 60. If on heating liquid through 80°C, the mass expelled is (1/100)th of mass still remaining, the coefficient of apparent expansion of liquid is (a) 1.25  10–4 /°C (b) 12.5  10–4 /°C (c) 1.25  10–5 /°C (b) None of these 61. In cold countries, water pipes sometimes burst, because (a) Pipe contracts (b) Water expands on freezing (c) When water freezes, pressure increases (d) When water freezes, it takes heat from pipes 62. A cylindrical metal rod of length L0 is shaped into a ring with a small gap as shown. On heating the system (a) x decreases, r and d increase (b) x and r increase, d decreases (c) x, r and d all increase (d) Data insufficient to arrive at a conclusion 63. The length of a metallic rod is 5m at 0°C and becomes 5.01 m, on heating upto 100°C. The linear expansion of the metal will be (a) 2.33  10–5 /°C (b) 6.0  10–5 /°C (c) 4.0  10–5 /°C (d) 2.0  10–5 /°C 64. A metal rod of silver at 0°C is heated to 100°C. It's length is increased by 0.19 cm. Coefficient of cubical expansion of the silver rod is (a) 5.7  10–5 /°C (b) 0.63  10–5 /°C (c) 1.9  10–5 /°C (d) 16.1  10–5 /°C 65. A brass disc fits simply in a hole of a steel plate. The disc from the hole can be loosened if the system (a) First heated then cooled (b) First cooled then heated (c) Is heated (d)Is cooled 66. An iron bar of length 10 m is heated from 0°C to 100°C. If the coefficient of linear thermal expansion of iron is 10  10–6 /°C, the increase in the length of bar is (a) 0.5 cm (b) 1.0 cm (c) 1.5 cm (d) 2.0 cm 67. If a cylinder of diameter 1.0 cm at 30°C is to be solid into a hole of diameter 0.9997 cm in a steel plate at the same temperature, then minimum required rise in the temperature of the plate is : (Coefficient of linear expansion of steel =  C − 12 10 / 6 ) (a) 25°C (b) 35°C X r d