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Heat, Temperature, and Humidity [ Physical Science] [ Science Set 10]| UPPSC Prelims PYQ of Last 30 Years |Important | Objective Question Answer, MCQ and QUIZ

Heat, Temperature, and Humidity [ Physical Science] [ Science Set 10]| UPPSC Prelims PYQ of Last 30 Years |Important | Objective Question Answer, MCQ and QUIZ

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1. The atmosphere exerts enormous pressure on us. But, we do not feel it because

a) Our blood exerts a pressure slightly more than that of the atmosphere

b) We are used to it

c) Our bones are very strong and can withstand the pressure

d) The surface area of our head is very small


Answer. a) Our blood exerts a pressure slightly more than that of the atmosphere;

.


2. Food gets cooked faster in a pressure cooker because

a) Water starts boiling at a lower temperature due to high-pressure

b) Water starts boiling at a higher temperature due to high-pressure

c) Water boils only at 100 degrees centigrade but the heat content is higher at high pressure

d) Convection currents are hot inside the pressure cooker


Answer. b) Water starts boiling at a higher temperature due to high pressure;

.


3. Maximum  temperature inside pressure cooker depends on-

a) Area of the hole on the top and weight kept on it

b) Area of the hole on the top and food being cooked

c) Weight kept on the hole at the top and food being cooked

d) Area of the hole on the top only


Answer. a) Area of the hole on the top and weight kept on it


4. What changes will the volume of water if the temperature is lowered from 9 degrees C to 3 degrees C-

a) The volume will not change

b)The volume will first increase and then decrease

c) The volume will first decrease and then increase

d) Water will freeze


Answer. c) The volume will first decrease and then increase;

.


5. When a bottle is filled with water and it is freezing the bottle breaks down, because

a) Water expands upon freezing

b) Bottle shrinks at freezing point

c) The temperature outside the bottle is higher than inside

d) Water expands on heating


Answer. a) Water expands upon freezing;

.


6. Consider the following statements-

Assertion A- If Ice collects in the freezer, the cooling in the refrigerator is affected adversely

Reason R- Ice is a poor conductor

Select the correct answer using the codes given below-

Code-

a) Both A and R are true, and R is the correct explanation of A

b) Both A and R are true, but R is not the correct explanation of A.

c) A is true, but R is false

d) A is false, but R is true


Answer. a) Both A and R are true, and R is the correct explanation of A ;

.



7. The gas used in immersion tubes for lighting decoration and advertisement is-

a) Carbon dioxide

b) Ammonia

c) Sulfur dioxide

d) Neon


Answer. d) Neon;

.



8. Expansion during heating

a) Occurs only in solid

b) Increase the weight of the material

c) Decrease the density of the material

d) Occurs at the same rate for all liquids and solids


Answer. c) Decrease the density of the material


9. When ice melts, then

a) Volume increase

b) Volume decrease

c) Mass increase

d) Mass decrease


Answer. b) Volume decrease


10. Thermostat is related to

a) Humidity

b) Temperature

c) Air

d) Clouds


Answer. b) Temperature;

.



11.  In cold countries, alcohol is preferred to mercury as a thermometric liquid because

a) Alcohol has a lower freezing point

b) Alcohol is a better conductor of heat

c) Alcohol is cheaper than mercury

d) The world production of alcohol greater than that of mercury


Answer. a) Alcohol has a lower freezing point;

Alcohol has a lower freezing point than mercury. In cold climates, especially during winter, alcohol-based thermometers are less likely to freeze and become unusable. Mercury thermometers can freeze in extremely cold conditions.



12. What is the function of the thermostat of a refrigerator?

a) to lower the temperature

b) To increase the freezing point 

c) To maintain a constant temperature

d) To decrease the melting point


Answer. c) To maintain a constant temperature;



13. At what temperature are the readings of a Centigrade and Fahrenheit the same?

a) -40

b) 212

c) 40

d) 100


Answer. a) -40;

.


14. The normal temperature of the human body is 98.4 degrees F. Its equivalent temperature at 0 degree C is -

a) 40.16

b) 36.89

c) 35.72

d) 32.36


Answer. b) 36.89;

.



15. When a glass rod is placed in steam, its length increases but its width-

a) Remains unchanged

b) Decrease

c) Increase

d) Becomes irregular


Answer. c) Increase


16. Which of the following statements is not true?

a) Air conditioner and Air cooler both maintain temperature

b) Air conditioner and Air cooler both maintain humidity

c) The air conditioner maintains humidity but the Air cooler does not maintain humidity

d) Both control the motion of the air


Answer. b) Air conditioner and Air cooler both maintain humidity;

.



17. What does an air conditioner installed in a room control?

a) temperature only

b) Humidity and temperature only

c) Pressure and Temperature only

d) Humidity, pressure, and temperature 


Answer. b) Humidity and temperature only


18. In which of the following conditions will wet clothes dry the most quickly?

a) 100 % humidity, 60 degree Centigrade temperature  

b) 100 % humidity, 20 degrees Centigrade temperature  

c) 20 % humidity, 20 degrees Centigrade temperature  

d) 20 % humidity, 60 degree Centigrade temperature  


Answer. d) 20 % humidity, 60 degree Centigrade temperature  


19. On adding common salt to water, the boiling point and freezing point of water will-

a) Increase

b) Decrease

c) Decrease and Increase respectively

d) Increase and decrease respectively


Answer. d) Increase and decrease respectively


20. It is more comfortable to wear white clothes in summer because-

a) They reflect all the heat falling on them

b) They radiate heat transferred from the body

c) They absorb perspiration

d) They are soothing to the eye


Answer. a) They reflect all the heat falling on them;

.


21. Consider the following statements-

Assertion A: Light-colored clothes are preferred in summer.

Reason R: Light colors are poor absorbers of heat.

Select the correct answer from the code given below-

a) Both A and R are true, and R correctly explains A.

b) Both A and R are true but R does not correctly explain A

c) A is true but R is false

d) A is false but R is true


Answer. a) Both A and R are true, and R correctly explains A.


22. In an earthen pitcher, the water remains cold due to the process of-

a) Condensation

b) Evaporation

c) Sublimation

d) None of the above


Answer. b) Evaporation;

.



23. Humid heat is experienced in summer when the weather-

a) It is unfortunate

b) It is intense

c) it is scorching

d) It is humid


Answer. d) It is humid


24. Xeric condition refers to

a) Low temperature

b) Low humidity

c) High evaporation

d) Extreme temperature


Answer. b) Low humidity;

. 



25. Assertion A- Woollen clothes keep us warm

Reason R- Woolen fibers are made from a special type of protein, which is a bad conductor of heat.

Select the correct answer from the codes given below-

a) Both A and R are true, and R is the correct explanation of A.

b) Both A and R are true, but R is not the correct explanation of A

c) A is true but R is false

d) A is false but R is true


Answer. a) Both A and R are true, and R is the correct explanation of A.


26. The maximum density of water is at

a) At 373 Kelvin

b) At 277 Kelvin

c) At 273 Kelvin

d) At 269 Kelvin


Answer. b) At 277 Kelvin;

To convert a temperature from Kelvin to degrees Celsius, you can use the following formula:

°C = K - 273.15

Simply subtract 273.15 from the temperature in Kelvin to get the temperature in degrees Celsius.



27. Why does water boil at temperatures below 100 centigrade at higher altitudes?

a) The atmospheric pressure decreases and hence boiling point is lowered

b) The gravitational attraction is less

c) Because of heavy winds in the mountains

d) None of the above is correct


Answer. a) The atmospheric pressure decreases and hence boiling point is lowered


28. If an unsaturated sugar solution is prepared by mixing 100 grams of sugar in half a liter of water, which of the following physical amounts will not change?

a) The mass

b) The density

c) Concentrations

d) Volume


Answer. d) Volume


29. The safest temperature for keeping food fresh in a refrigerator is

a) 4 degrees C

b) 8 degrees C

c) 0 degrees C

d) 10 degrees C

release

Answer. a) 4 degrees C


29. When soggy biscuits are kept inside the fridge for some time they become crisp because-

a) Cooling releases extra moisture

b) Humidity inside the fridge is low and extra moisture is absorbed

c) Humidity inside the fridge is high and extra moisture is absorbed

d) Pressure inside the fridge is high and helps in releasing extra moisture


Answer. b) Humidity inside the fridge is low and extra moisture is absorbed



30. In Cold Weather, aquatic animals survive even when water at the top layer of the lake freezes into ice because-

a) They can breathe in ice

b) They have enough accumulated oxygen inside them

c) Their body structure is such that the survive without oxygen

d) Water has the highest density at 4 degrees centigrade so underneath the top layer of ice there is a layer of water.


Answer. d) Water has the highest density at 4 degrees centigrade so underneath the top layer of ice there is a layer of water.


31. Fish can survive in a frozen lake because-

a) Fish are warm-blooded animals

b) Fish hibernate in ice

c) Water does not freeze at the bottom of the lake

d) Ice is a good conductor of heat


Answer. c) Water does not freeze at the bottom of the lake


 32. Why do pendulum clocks usually lose time in summer?

a) Due to longer days in summer

b) Due to friction caused by coils

c) The length of the pendulum increase

d) The weight of the pendulum change in summer


Answer. c) The length of the pendulum increase;

.


33. The hand burns more by steam comparatively to boiling water, because- 

a) The steam has a latent heat

b) Steam sneaked into the body

c) The steam has more power

d) Steam is the gig


Answer. a) The steam has a latent heat;




34.


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