# Heat and Thermodynamics One Liner Questions & Answers

 Questions Answers 1 Transfer of heat by convection can take place in – Gases and liquids 2 Steam at 100ºC causes more severe burns than the water at the same temperature, because – Steam provides more heat 3 The hand burns more by steam comparatively to boiling water, because – The steam has latent heat 4 The heat required in calories to convert one gram of ice at 0° C to steam at 100° C is approximately – 720 5 At what temperature are the reading of a Centigrade and Fahrenheit thermometer the same? – 40 6 At what point the Fahrenheit temperature is double of centigrade temperature? 160o C 7 The body temperature of a healthy man is – 37° Celsius 8 The normal temperature of the human body on the Kelvin scale is – 310 9 The normal temperature of the human body is 98.4°F. It’s the equivalent temperature in °C is – 36.89 10 A measured temperature in Fahrenheit scale is 200ºF. What will be its value in Celsius scale? 93.3ºC 11 The value of 40 degrees Celsius in Fahrenheit scale is – 104º F 12 The value of 50° C on the Fahrenheit scale is – 122°F 13 In cold countries, alcohol is preferred to mercury as a thermometric liquid because – Alcohol has a lower freezing point 14 What is absolute zero temperature? Theoretically the lowest possible temperature 15 Expansion during heating – Decreases the density of the material 16 When ice melts, then – Volume decreases 17 What is the use of thermostat? To maintain the temperature 18 Thermostat is related to – Temperature 19 The thermostat is a device which – Automatically regulates the temperature of a system 20 What is the function of the thermostat of a refrigerator? To maintain a constant temperature 21 The safest temperature for keeping food fresh in a refrigerator is – 4°C 22 When soggy biscuits are kept inside the fridge for sometimes they become crisp because – Humidity inside the fridge is low and extra moisture is absorbed 23 When a glass rod is placed in steam, its length increases but its width – Increases 24 In winter you touch a log of wood and a rod of iron, you will feel rod of iron is colder because – In comparison to wood, iron is good conductor of heat 25 If the temperature of air increases, how would it afect its ability to assume water vapour – Increases 26 In the night of strong wind, dew is not formed because – The rate of evaporation is fast 27 What does an air conditioner installed in a room control? Humidity and temperature only 28 The cooling by a desert cooler is based on – Evaporative cooling 29 Cooling is done by – Release of compressed gas 30 On adding common salt to water, the boiling point and freezing point of water will – Increase and decrease respectively 31 To keep drinks at the same temperature for quite sometime, the walls of thermos bottle are coated with – Silver layer 32 It is more comfortable to wear white cloth in summer because – They reflect all the heat falling on them 33 White clothes are cooler than black clothes because – They reflect the whole light 34 Loss of water from the body through perspiration depends on – Atmospheric temperature & Atmospheric humidity 35 The most important function of perspiration is to – Regulate body temperature 36 A fan produces a feeling of comfort during hot weather, because – Our perspiration evaporates rapidly 37 In an earthen pitcher, the water remains cold due to the process of – Evaporation 38 In the season of summer, we experience a humid heat when weather – Humid weather 39 Xeric condition refers to – Low humidity 40 The atmosphere exerts enormous pressure on us. But, we do not feel it because – Our blood exerts a pressure slightly more than that of the atmosphere 41 Food gets cooked faster in a pressure cooker because – Water starts boiling at a higher temperature due to high pressure 42 Pressure-cooker cooks food in less time because – Temperature of boiling water increases due to high pressure 43 Maximum temperature inside pressure cooker depends on – Area of hole on the top and weight kept on it 44 When water is heated from 0°C to 10°C. It’s volume – First decreases and then increases 45 What changes will the volume of water show if the temperature is lowered from 9°C to 3°C – The volume will first decrease and then increase 46 When a bottle is filled with water and it is freezing the bottle breaks down, because – Water expands upon freezing 47 When a piece of ice floating in a glass of water melts, the level of water will – Remain same 48 Cloudy nights are warmer compared to clear cloudless nights, because clouds – Refect back the heat given of by earth 49 The cloudy nights are warmer than clear nights because – The clouds prevent radiation of heat from the ground and the air 50 Fruit stored in a cold chamber exhibits longer storage life because – Rate of respiration is decreased 51 Opening the door of refrigerator kept in the room – You can warm the room a little 52 If a gas is compressed to half of its original volume at 27°C, to what temperature should it be heated to make it occupy its original volume? 327°C