General Science | Physics | Thermodynamics
General Science | Physics | Thermodynamics
1. The heat required in calories to convert one gram of ice at 0°C to steam at 100ºC is approximately
80
336
720
620
Correct Answer
Wrong Answer
2. At what temperature are the reading of a Centigrade and Fahrenheit thermometer the same?
- 40°
212°
40°
100°
Correct Answer
Wrong Answer
3. Steam at 100°C causes more severe burns than the water at the same temperature, because
Steam is a gas
Steam provides more heat
Steam is highly combustible
Steam exerts more pressure
Correct Answer
Wrong Answer
4. The hand burns more by steam comparatively to boiling water, because
The steam has latent heat
Steam sneaked into the body
The steam has more power
Steam is gig
Correct Answer
Wrong Answer
5. At what point the Fahrenheit tem- perature is double of Centigrade temperature?
- 6.7°C
- 12.3°C
12.3°C
160°C
Correct Answer
Wrong Answer
6. The body temperature of a healthy man is
37° Celsius
37° Fahrenheit
98.4° Celsius
98.4° Kelvin
Correct Answer
Wrong Answer
7. The normal temperature of human body on the Kelvin scale is
280
290
300
310
Correct Answer
Wrong Answer
8. The normal temperature of human body is 98.4°F. It's equivalent temperature (in ºC) is
40.16
36.89
35.72
32.36
Correct Answer
Wrong Answer
9. In cold countries, alcohol is preferred to mercury as a thermo-metric liquid because
Alcohol has a lower freezing point
Alcohol is a better conductor of heat
Alcohol is cheaper than mercury
The world production of alcohol is greater than that of mercury
Correct Answer
Wrong Answer
10. Which one of the following is used as an antifreeze for the automobile engines?
Ethanol
Ethylene glycol
Methanol
Propyl alcohol
Correct Answer
Wrong Answer
11. Transfer of heat by convection can take place in
Solids and liquids
Solids and vacuum
Gases and liquids
Vacuum and gases
Correct Answer
Wrong Answer
12. When ice melts, then
Volume increases
Volume decreases
Mass increases
Mass decreases
Correct Answer
Wrong Answer
13. What is the use of thermostat?
To measure the temperature
To increase the temperature
To maintain the temperature
To convert heat into electricity
Correct Answer
Wrong Answer
14. Thermostat is related to
Humidity
Temperature
Air
Clouds
Correct Answer
Wrong Answer
15. Thermostat is a device which
Measures heat
Measures temperature
Automatically regulates the temperature of a system
Automatically regulates pressure of a system
Correct Answer
Wrong Answer
16. What is the function of the thermostat of a refrigerator?
To lower the temperature
To increase the freezing point
To maintain constant temperature
To decrease the melting point
Correct Answer
Wrong Answer
17. The safest temperature for keeping food fresh in a refrigerator is
4°C
8°C
0°C
10°C
Correct Answer
Wrong Answer
18. When soggy biscuits are kept inside the fridge for sometime they become crisp because
Cooling releases extra moisture
Humidity inside the fridge is low and extra moisture is absorbed
Humidity inside the fridge is high and extra moisture is absorbed
Pressue inside the fridge is high and help in releasing extra moisture
Correct Answer
Wrong Answer
19. When a glass rod is placed in steam, its length increases but its width
Remains unchanged
Decreases
Increases
Becomes irregular
Correct Answer
Wrong Answer
20. In winter you touch a log of wood and a rod of iron, you will feed rod of iron is colder because
The heat of rod of iron is less than the heat of log of wood
In comparison to wood, iron is good conductor of heat
In comparison to wood, iron is bad conductor of heat
The rod of iron is heavier than the log of wood
Correct Answer
Wrong Answer
21. If the temperature of air increases, how would it affect its ability to assume water vapour?
Decrease
Increase
Firstly decrease, then again increase
Remains constant
Correct Answer
Wrong Answer
22. What does an air conditioner installed in a room control?
Temperature only
Humidity and temperature only
Pressure and temperature only
Humidity, pressure and temperature
Correct Answer
Wrong Answer
23. The cooling by a desert cooler is based on
Hot air replacement
Air dehydration
Evaporative cooling
Air rehydration
Correct Answer
Wrong Answer
24. Cooling is done by
Flow of water
Release of compressed gas
Cooking gas
Melting the solid
Correct Answer
Wrong Answer
25. In which of the following conditions wet clothes will dry earliest?
100% RH, 60°C temperature
100% RH, 20°C temperature
20% RH, 20°C temperature
20% RH, 60°C temperature
Correct Answer
Wrong Answer
26. Which one of the following changes occurs when salt is added into the water?
Boiling point is increased and freezing point is decreased
Boiling point is decreased and freezing point is increased
Both boiling point and freezing point are decreased
Both boiling point and freezing point are increased
Correct Answer
Wrong Answer
27. On adding common salt to water, the boiling point and freezing point of water will
Increase
Decrease
Decrease and increase respectively
Increase and decrease respectively
Correct Answer
Wrong Answer
28. To keep drinks at the same temperature for quite sometime, the walls of thermos bottle are coated with
Aluminium Paint
Lead Powder
Silver Layer
Mercury Layer
Correct Answer
Wrong Answer
29. It is more comfortable to wear white cloth in summer because
They reflect all the heat falling on them
They radiate heat transferred from the body
They absorb perspiration
They are soothing to the eye
Correct Answer
Wrong Answer
30. The most important function of perspiration is to
Regulate body temperature
Regulate body water supply
Get rid of body poison
Keep the skin pores clear of dirt
Correct Answer
Wrong Answer
31. Lightning can even burn a tree because it contains tremendous amount of
Heat energy
Electric energy
Chemical energy
Nuclear energy
Correct Answer
Wrong Answer
32. A fan produces feeling of comfort during hot weather, because
fan supplies cold air
our perspiration evaporates rapidly
one body radiates more heat
conductivity of air increase
Correct Answer
Wrong Answer
33. In an Earthen pitcher, the water remains cold due to the process of
Condensation
Evaporation
Sublimation
None of the above
Correct Answer
Wrong Answer
34. On a specific day and time, the temperature was 48°C in Churu and 24°C in Shimla. Two metallic cups identical in all respects contained water at 95°C in Churu and 71°C in Shimla. Which one of these two cups reached room temperature first?
Cup in Churu
Cup in Shimla
Both cups reached room temperature at the same time
Data are not enough to find out result
Correct Answer
Wrong Answer
35. In the season of summer, we experience a humid heat when weather
Start of summer
Middle of summer
Scorching weather
Humid weather
Correct Answer
Wrong Answer
36. Xeric condition refers to
low temperature
low humidity
high evaporation
extreme temperature
Correct Answer
Wrong Answer
37. Food gets cooked faster in a pressure cooker because
Water starts boiling at a lower temperature due to high pressure
Water starts boiling at a higher temperature due to high pressure
Water boils only at 100°C but the heat content is higher at high pressure
Convection currents are set inside the cooker
Correct Answer
Wrong Answer
38. Pressure cooker cooks food in lesser time because
The temperature of boiling water decreases due to high pressure
Air has no effect as it is closed from all sides
Temperature of boiling water increases due to high pressure
Evaporation of the water used is very small
Correct Answer
Wrong Answer
39. Maximum temperature inside pressure cooker depends on
Area of hole on the top and weight kept on it
Area of hole on the top and food being cooked
Weight kept on hole at top and food being cooked
Area of hole on the top only
Correct Answer
Wrong Answer
40. When water is heated from 0°C to 10°C. It's volume
Increases
Decreases
Does not change
First decreases and then increases
Correct Answer
Wrong Answer
41. What changes will the volume of water show if the temperature is lowered from 9°C to 3°C?
The volume will not change
The volume will first increase and then decrease
The volume will first decrease and then increase
Water will freeze
Correct Answer
Wrong Answer
42. When a bottle is filled with water and it is freezing the bottle breaks down, because
Water expands upon freezing
Bottle shrinks at freezing point
The temperature outside the bottle is higher than inside
Water expands on heating
Correct Answer
Wrong Answer
43. A glass bottle containing water tightly corked breaks when it is kep in freeze, because
Bottle shrinks on freezing
The volume of water decreases on freezing
The volume of water increases on freezing
Glass is the bad conductor of heat
Correct Answer
Wrong Answer
44. When a piece of ice floating in a glass of water melts, the level of water will
Fall
Rise
Remain same
Fall or rise depends on the temperature of water
Correct Answer
Wrong Answer
45. Cloudy nights are warmer compared to clear cloudless nights, because clouds
Prevent cold waves from the sky from descending on Earth
Reflect back the heat given off by Earth
Produce heat and radiate it towards Earth
Absorb heat from the atmosphere and send it toward Earth
Correct Answer
Wrong Answer
46. The cloudy nights are warmer than clear nights because
The clouds prevent radiation of heat from the ground and the air
Clouds absorb Sunlight during the day and radiate the same in night
Clouds make the atmosphere damp and generate heat
The clouds obstruct the movement of air which creates heat
Correct Answer
Wrong Answer
47. Fruit stored in a cold chamber exhibit longer storage life because
Exposure to Sunlight is prevented
Concentration of carbon dioxide in environment is increases
Rate of respiration is decreased
There is increase in humidity
Correct Answer
Wrong Answer
48. A hydrogen inflated polythene balloon is released from the surface of the Earth. As the balloon rises to an altitude up in the atmosphere, it will
Decrease in size
Flatten into disc like shape
Increase in size
Maintain the same size and shape
Correct Answer
Wrong Answer
49. Opening the door of refrigerator kept in the room
You can cool the room to some degree
You can cool the room to the temperature of refrigerator
You are warm the room a little
You can neither cool nor warm the room
Correct Answer
Wrong Answer
50. 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
600°C
54°C
300°C
