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