The most important MCQs from Summer and Thermodynamics with Answer

Heat and thermodynamics is an important subject in physics, in which concepts such as temperature, heat transfer, thermodynamics rules and entropy are covered. Mastery in these concepts helps solve various real -life problems and competitive exam questions.

Below are some of the most important multiple choice questions (MCQ) with their answers.

Summer and Thermodynamics MCQs

1. What happens when the door of a refrigerator is left open in a closed room?
A) The room gets cold
B) room temperature rises
C) No change in room temperature
d) Refrigerator stops working

2. Which device is used to measure too much temperature?
Thermometer
B) Pymimeter
C) Calorimeter
D) barometer

3. What is the limit of a medical thermometer?
a) 0 ° F to 100 ° F
B) 96 ° F to 110 ° F
C) 32 ° F to 212 ° F
D) 35 ° C to 42 ° C

4. At which temperature does water have maximum density?
a) 0 ° c
B) 4 ° C
C) 10 ° C
d) 100 ° C

5.
A) Ice is less dense than water
B) ice is more dense than water
C) water spreads on cold
D) both A and C

6. Which substance has the most specific heat?
A) Iron
B) Copper
Ghazal
d) Mercury

7. What is the relationship between linear (α), superficial (β), and cubical (γ) expansion coefficients?
a) α: β: γ = 1: 2: 3
B) α: β: γ = 3: 2: 1
c) α: β: γ = 2: 3: 1
D) α: β: γ = 1: 3: 2

8. What happens to complete humidity when temperature rises?
a) grows
B) decreases
C) remains stable
d) First grows then decreases

9. Which incident explains why two thin blankets are hot compared to a thick blanket?
A) conduction
B) convection
C) Air acting as an insulator
D) radiation

10. A copper ball and an aluminum area of ​​the same mass is heated at the same temperature and then placed in the same calorimeter that contains equal amount of water at room temperature. Which statement is correct?
A) There will be higher temperature in water in copper shells
B) Aluminum sector will cause higher temperature increase in water
C) Both shells will cause an increase in the same temperature in water
D) The result cannot be determined without knowing the initial temperature

11. What type of radiation is most emitted at low temperatures?
A) ultraviolet
B) visible light
C) infrared
D) X-ray

12. What is used to measure wires temperature?
Thermometer
B) Pymimeter
C) Win’s law
D) Calorimeter

13. What is the SI unit of specific heat?
A) Cal/G ° C
B) J/kg of
C) J/G ° C
d) Cal/kg k

14. A body is equal to water equal:
A) mass × specific heat
B) mass / specific heat
C) specific heat / mass
d) mass + specific heat

15. Which principle is used in calorimatry?
a) Summer lost = heat received
B) Pressure remains stable
C) Volume remains stable
d) The temperature remains stable

16. What is thermal capacity?
A) The heat required to increase body temperature from 1 ° C
B) The heat required to melt a body
C) The heat required to boil a body
d) Summer lost by a body

17. What is the mechanical counterpart of heat (J)?
a) 4.2 J/Cal
B) 1 J/Cal
c) 0.24 J/Cal
d) 10 J/Cal

18. Which law suggests that two bodies are in balance with each other in thermal balance with the third body?
a) First rule of thermodynamics
B) Zero Law of Thermodynamics
C) Second rule of thermodynamics
D) Third rule of thermodynamics

19. Which temperature scale has no negative value?
A) Celsius
B) Fahrenheit
C) Calvin
d) rankin

20. What happens to the boiling point of water when salt is added?
a) grows
B) decreases
C) remains the same
d) First grows then decreases

21. Why is glycerol added to a car radiator in cold countries?
a) To increase boiling point
B) for low cold point
C) to reduce viscosity
d) to prevent war

22. Which gas is used as a coolant in the refrigerator?
A) Oxygen
B) nitrogen
C) ammonia
d) Carbon dioxide

23. What is the normal human body temperature in Fahrenheit?
a) 98.4 ° F
B) 100 ° F
c) 96 ° F
d) 104 ° F

24. According to the principle of calorimatri, when two bodies are mixed at different temperatures, the final temperature depends:
a) only warm body mass
B) only the specific heat of the cold body
C) Product of mass and specific heat for both bodies
d) color of containers used

25. What is cryogenics?
A) High temperature study
B) Study of very low temperature
C) Study of heat transfer
D) Study of pressure effects

26. Why does ice melt under pressure?
a) The melting point decreases
B) Melting point increases
C) heat is released
d) Volume expands

27. What is important temperature?
a) The top temperature above which the gas cannot be liquefied
B) The temperature at which the solid melts
C) temperature at which liquid boils
d) Full zero temperature

28. Which device measures body temperature?
A) Pyrometer
B) clinical thermometer
C) Calorimeter
D) barometer

29. What is the boiling point of water in the pressure cooker?
a) 100 ° C
B) 120 ° C
C) 80 ° C
D) 60 ° C

30. What is the principle of pressure cooker?
A) Increases the boiling point by reducing pressure
B) increases the boiling point by increasing the pressure
C) reduces boiling point due to increased pressure
D) reduces the pressure and reduces the boiling point

Summer and Thermodynamics MCQ answer

1. B
2. B
3. B
4. B
5. D
6. C
7. A
8. A
9. C
10. B
11. C
12. C
13. B
14. A
15. A
16. A
17. A
18. B
19. C
20. A
21. B
22. C
23. A
24. C
25. B
26. A
27. A
28. B
29. B
30. B