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Heat and Thermodynamics
What is 10 °C in Fahrenheit?
A. 50 °F
B. 51 °F
C. 49 °F
D. 52 °F
Correct Answer: A
°F=(9/5)°C+32.
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Heat and Thermodynamics
What is 0 °C in Fahrenheit?
A. 31 °F
B. 32 °F
C. 33 °F
D. 34 °F
Correct Answer: B
°F=(9/5)°C+32.
CSS - PMS - CCE - PCS - Everyday Science
Heat and Thermodynamics
What is -40 °C in Fahrenheit?
A. -40 °F
B. -38 °F
C. -41 °F
D. -39 °F
Correct Answer: A
°F=(9/5)°C+32.
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Heat and Thermodynamics
What is 100 °C in kelvin?
A. 410.47 K
B. 373.15 K
C. 335.83 K
D. 374.15 K
Correct Answer: B
K=°C+273.15.
CSS - PMS - CCE - PCS - Everyday Science
Heat and Thermodynamics
What is 50 °C in kelvin?
A. 323.15 K
B. 290.83 K
C. 324.15 K
D. 355.47 K
Correct Answer: A
K=°C+273.15.
CSS - PMS - CCE - PCS - Everyday Science
Heat and Thermodynamics
What is 37 °C in kelvin?
A. 310.15 K
B. 279.13 K
C. 311.15 K
D. 341.17 K
Correct Answer: A
K=°C+273.15.
CSS - PMS - CCE - PCS - Everyday Science
Heat and Thermodynamics
What is 25 °C in kelvin?
A. 299.15 K
B. 298.15 K
C. 268.33 K
D. 327.96 K
Correct Answer: B
K=°C+273.15.
CSS - PMS - CCE - PCS - Everyday Science
Heat and Thermodynamics
What is 20 °C in kelvin?
A. 293.15 K
B. 322.46 K
C. 294.15 K
D. 263.83 K
Correct Answer: A
K=°C+273.15.
CSS - PMS - CCE - PCS - Everyday Science
Heat and Thermodynamics
What is 0 °C in kelvin?
A. 300.46 K
B. 273.15 K
C. 274.15 K
D. 245.83 K
Correct Answer: B
K=°C+273.15.
CSS - PMS - CCE - PCS - Everyday Science
Heat and Thermodynamics
What is -20 °C in kelvin?
A. 227.84 K
B. 253.15 K
C. 278.47 K
D. 254.15 K
Correct Answer: B
K=°C+273.15.
CSS - PMS - CCE - PCS - Everyday Science
Heat and Thermodynamics
What is -40 °C in kelvin?
A. 233.15 K
B. 256.47 K
C. 234.15 K
D. 209.84 K
Correct Answer: A
K=°C+273.15.
CSS - PMS - CCE - PCS - Everyday Science
Heat and Thermodynamics
A refrigerator transfers heat from cold to hot using:
A. gravity alone
B. spontaneous heat flow only
C. external work
D. nuclear decay
Correct Answer: C
Work drives heat against spontaneous direction.
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Heat and Thermodynamics
The second law says total entropy of an isolated system tends to:
A. remain negative
B. equal temperature
C. not decrease
D. always become zero
Correct Answer: C
Total entropy does not decrease spontaneously.
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Heat and Thermodynamics
The first law of thermodynamics expresses conservation of:
A. Energy
B. mass number
C. electric charge only
D. momentum only
Correct Answer: A
The first law is energy conservation.
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Heat and Thermodynamics
Latent heat changes a substance's:
A. mass entirely into energy
B. chemical identity necessarily
C. atomic number
D. phase without temperature change during an ideal phase transition
Correct Answer: D
Latent heat changes phase.
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Heat and Thermodynamics
Specific heat capacity is heat needed to raise:
A. a gas to boiling only
B. any mass by 100 degrees
C. unit mass by one degree
D. one mole only by 10 degrees
Correct Answer: C
c=Q/(mΔT).
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Heat and Thermodynamics
Thermal radiation can travel through:
A. Vacuum
B. liquids only
C. air only
D. solids only
Correct Answer: A
Radiation needs no material medium.
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Heat and Thermodynamics
Heat transfer by bulk fluid motion is:
A. Convection
B. Fusion
C. Radiation
D. Conduction
Correct Answer: A
Convection involves bulk motion.
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Heat and Thermodynamics
Heat transfer through a stationary solid is mainly:
A. Conduction
B. Radiation
C. Evaporation only
D. Convection
Correct Answer: A
Conduction dominates in solids.
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Heat and Thermodynamics
The SI unit of thermodynamic temperature is:
A. kelvin
B. watt
C. joule
D. degree Celsius
Correct Answer: A
Kelvin is the SI unit.