quiz

First Law of Thermodynamics

1. Which principle forms the basis of the first law of thermodynamics?

  • A) The conservation of matter
  • B) The conservation of energy
  • C) The law of entropy
  • D) The law of motion
A) The conservation of energy Explanation

2. According to the First Law of Thermodynamics, what is the relationship between internal energy (U), heat (Q), and work (W)?

  • A) ΔU=Q+W
  • B) ΔU=Q−W
  • C) ΔU=W−Q
  • D) ΔU=Q×W
B) ΔU=Q−W Explanation

3. Which scientist was the first to experimentally demonstrate the interchangeability of heat and work?

  • A) Rudolf Clausius
  • B) Lord Kelvin
  • C) James Prescott Joule
  • D) Isaac Newton
C) James Prescott Joule Explanation

4. Which example illustrates the First Law of Thermodynamics?

  • A) A car engine converting fuel into motion
  • B) A magnet attracting iron filings
  • C) An apple falling from a tree
  • D) Sound waves traveling through the air
A) A car engine converting fuel into motion Explanation

5. When no heat is added or removed from a system, what happens to the internal energy if the system does 30 J of work?

  • A) It increases by 30 J
  • B) It decreases by 30 J
  • C) It remains the same
  • D) It increases by 15 J
B) It decreases by 30 J Explanation

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