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 |