Heat and Thermodynamics part-(1)

Heat and Thermodynamics part-(1)

Total Questions: 46

11. At what point the fahrenheit temperature is double of centigrade temperature ? [R.A.S./R.T.S (PRE) 2007]

Correct Answer: (d) 160°C
Note:

⇒According to formula
C/5=(F-32)/9 [placing F=2C]

⇒ 9C=10C-160

⇒C=160

Hence at h temperature of 160°C  the fahrenhiet temperature is double .

12. The body temperature of a healthy man is - [Uttarakhand P.C.S.(PRE) 2005]

Correct Answer: (a) 37°Celsius
Note:

The normal core body temperature of a healthy, resting adult human being is stated to be at 98.6 degrees Fahrenheit or about 37.0 degrees Celsius. Though the body temperature measured on an individual can vary, a healthy body can maintain a fairly consistent body temperature that is around the mark of 37.0 degree Celsius. If we convert 37 degree Celsius to Kelvin, it equals to 310 Kelvin.

13. The normal temperature of human body on the Kelvin scale is - [I.A.S. (PRE) 1995]

Correct Answer: (d) 310
Note:

The normal core body temperature of a healthy, resting adult human being is stated to be at 98.6 degrees Fahrenheit or about 37.0 degrees Celsius. Though the body temperature measured on an individual can vary, a healthy body can maintain a fairly consistent body temperature that is around the mark of 37.0 degree Celsius. If we convert 37 degree Celsius to Kelvin, it equals to 310 Kelvin.

14. The normal temperature of human body is 98.4° fahrenheit . Its equivalent temperature in °c is - [U.P.P.C.S. (pre)(re.exam) 2015]

Correct Answer: (b) 36.89
Note:

The formula to convert fahrenheit
(°F) to celsius (°C) is
°C=(°F-32)*5/9
since the temperature in °F=98.4°

∴°C=(98.4-32)*5/9=36.89°C

15. Normal temperature of human body on celsius scale will be - [41st B.P.S.C. (PRE) 1996]

Correct Answer: (c) 36.9 degree
Note:

The formula to convert fahrenheit
(°F) to celsius (°C) is
°C=(°F-32)*5/9
since the temperature in °F=98.4°

∴°C=(98.4-32)*5/9=36.89°C

16. Food gets cooked faster in a pressure cooker because- [U.P.P.C.S. (Pre) 2007]

Correct Answer: (b) Water starts boiling at a higher temperature due to high pressure
Note:

Food can be cooked faster in a pressure cooker since the boiling point of water increases with increase in pressure. As the water boils, the steam produced cannot evaporate so the pressure inside the cooker increases. The boiling point of water now becomes about 120°C. The load pin fixed on the heavy aluminum lid prevents any escape of steam. The rubber ring around the lid deals the liquid inside. Thus food gets cooked faster in a pressure cooker. Pressure cookers are more common in the mountains where elevation is high. At higher elevations, atmospheric pressure is lower and therefore water boils at lower temperature. In order to make up for that difference, people use pressure cookers.

17. Food gets cooked faster in a pressure cooker because: (a) water starts boiling at low temperature due to high pressure [67th B.P.S.C.(PRE) 2022]

Correct Answer: b) water starts boiling at high temperature due to high pressure
Note:

Food can be cooked faster in a pressure cooker since the boiling point of water increases with increase in pressure. As the water boils, the steam produced cannot evaporate so the pressure inside the cooker increases. The boiling point of water now becomes about 120°C. The load pin fixed on the heavy aluminum lid prevents any escape of steam. The rubber ring around the lid deals the liquid inside. Thus food gets cooked faster in a pressure cooker. Pressure cookers are more common in the mountains where elevation is high. At higher elevations, atmospheric pressure is lower and therefore water boils at lower temperature. In order to make up for that difference, people use pressure cookers.

18. Pressure-cooker cooks food in lesser time because [Uttarakhand P.C.S. (Pre) 2005]

Correct Answer: (c) The temperature of boiling water increases due to high pressure
Note:

Food can be cooked faster in a pressure cooker since the boiling point of water increases with increase in pressure. As the water boils, the steam produced cannot evaporate so the pressure inside the cooker increases. The boiling point of water now becomes about 120°C. The load pin fixed on the heavy aluminum lid prevents any escape of steam. The rubber ring around the lid deals the liquid inside. Thus food gets cooked faster in a pressure cooker. Pressure cookers are more common in the mountains where elevation is high. At higher elevations, atmospheric pressure is lower and therefore water boils at lower temperature. In order to make up for that difference, people use pressure cookers.

19. Why does food cooked faster in pressure cooker? [U.P. Lower Sub (pre) 2002]

Correct Answer: (a) the increased pressure increase the boiling point
Note:

Food can be cooked faster in a pressure cooker since the boiling point of water increases with increase in pressure. As the water boils, the steam produced cannot evaporate so the pressure inside the cooker increases. The boiling point of water now becomes about 120°C. The load pin fixed on the heavy aluminum lid prevents any escape of steam. The rubber ring around the lid deals the liquid inside. Thus food gets cooked faster in a pressure cooker. Pressure cookers are more common in the mountains where elevation is high. At higher elevations, atmospheric pressure is lower and therefore water boils at lower temperature. In order to make up for that difference, people use pressure cookers.

20. Food is cooked faster in pressure cooker because [Uttarakhand Lower Sub.(PRE) 2010]

Correct Answer: (c) due to high pressure the boiling of water is raised
Note:

Food can be cooked faster in a pressure cooker since the boiling point of water increases with increase in pressure. As the water boils, the steam produced cannot evaporate so the pressure inside the cooker increases. The boiling point of water now becomes about 120°C. The load pin fixed on the heavy aluminum lid prevents any escape of steam. The rubber ring around the lid deals the liquid inside. Thus food gets cooked faster in a pressure cooker. Pressure cookers are more common in the mountains where elevation is high. At higher elevations, atmospheric pressure is lower and therefore water boils at lower temperature. In order to make up for that difference, people use pressure cookers.

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