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Heat

📆 December 6, 2024

Total Questions: 49

1. __________ states that internal energy is a function of state and the increase in internal energy is equal to the sum of the heat supplied to system and work done by the system. [S.S.C. Online CHSL (T-I) 1.02.2017 (Shift-I)]

Correct Answer: (a) First Law of Thermodynamics
Solution:

First law of thermodynamics states that internal energy is a function of state and the increase in internal energy is equal to the sum of the heat supplied to the system and the work done by the system.

Mathematically:

ΔU=Q−W

Where:

  • ΔU = change in internal energy

  • Q = heat supplied to the system

  • W = work done by the system

  1. It states that the energy of the universe remains the same.
  2. Though it may be exchanged between the system and the surroundings, it can't be created or destroyed.
  3. The law basically relates to the changes in energy states due to work and heat transfer.
  4. It redefines the conservation of energy concept.

2. Heat, in _________ , is a type of energy transfer from a warmer substance to a colder one. [S.S.C. Online CHSL (T-I) 06.08.2021 (Shift-I)]

Correct Answer: (d) thermodynamics
Solution:Heat, in thermodynamics, is a type of energy transfer from a warmer substance to a colder one.
  • William Thomson codified the first two laws of thermodynamics.
  • He created the standard temperature scale, in which -273.15 °C was considered an absolute zero temperature, also known as OK (zero Kelvin).
  • The S.I. unit of thermodynamic temperature is Kelvin.

3. __________codified the first two laws of thermodynamics and deduced that the absolute zero of temperature is-273.15°C. He was honoured for this with the naming of the Kelvin temperature scale. [S.S.C. Online Graduation Level (T-I) 7.06.2019 (Shift-III)]

Correct Answer: (c) William Thomson
Solution:
  • William Thomson codified the first two laws of thermodynamics.
  • He created the standard temperature scale, in which -273.15 °C was considered an absolute zero temperature, also known as OK (zero Kelvin).
  • The S.I. unit of thermodynamic temperature is Kelvin.

4. Which of the following is the SI unit of thermodynamic temperature? [S.S.C. Online CHSL (T-I) 18.03.2020 (Shift-III)]

Correct Answer: (d) Kelvin
Solution:The SI unit of thermodynamic temperature is the kelvin (K).

  • Celsius — temperature scale, not SI unit

  • Fahrenheit — temperature scale, not SI unit

  • Radian — unit of angle, not temperature

5. The difference in temperature between two bodies is 30 degree centigrade. What is the difference in degree Fahrenheit? [S.S.C. Online CPO S.I. (T-I) 23.11.2020 (Shift-I)]

Correct Answer: (b) 54
Solution:
  • Each Celsius degree equals 5/9ths of a Fahrenheit degree.
  • Each Fahrenheit degree equals 9/5ths of a Celsius degree.

So, (30 × 9) / 5 = 54 degree Fahrenheit

6. 0°K is equivalent to- [S.S.C. Online Graduation Level (T-I) 3.09.2016 (Shift-I)]

Correct Answer: (b) - 273 °C
Solution:0°K (zero kelvin) is equivalent to -273.15°C (degrees Celsius).
  • The Kelvin scale is the absolute temperature scale used in science.
  • 0 K is called absolute zero — the lowest possible temperature, where:
  • Molecular motion theoretically stops
  • No more thermal energy can be extracted

7. Absolute Zero is defined as________. [S.S.C. Online Graduation Level (T-I) 11.09.2016 (Shift-II)]

Correct Answer: (a) The temperature at which all molecular motion ceases.
Solution:0°K (zero kelvin) is equivalent to -273.15°C (degrees Celsius).
  • The Kelvin scale is the absolute temperature scale used in science.
  • 0 K is called absolute zero — the lowest possible temperature, where:
  • Molecular motion theoretically stops
  • No more thermal energy can be extracted

8. What is the boiling point at standard atmospheric pressure at sea-level and 45° latitude of water on the Celsius scale? [S.S.C. Online Graduation Level (T-I) 20.08.2021 (Shift-I)]

Correct Answer: (c) 100 ° C
Solution:The boiling point of water is 100° C at sea level and at standard atmospheric pressure taken at 45° latitude.

9. What is the SI unit of quantity of heat? [S.S.C. JE Civil Exam 23.03.2021 (Shift-I)]

Correct Answer: (d) Joule
Solution:Heat is a form of energy that is transferred between two or more bodies or between a system and its surroundings due to the difference in temperature.
  • The SI unit of heat is expressed in joules (J).
  • The St unit of temperature is Kelvin (K).

10. One joule is approximately equal to________. [S.S.C. Online MTS (T-I) 15.10.2017 (Shift-II)]

Correct Answer: (c) 0.24 calorie
Solution:Joules and calories are units of expression of thermal energy.
  • The value of a 1 joule is equal to 0.24 calories.
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