ACSEE (Form 6) Heat (First Law of Thermodynamics) — practice questions

Explore 4 free Heat (First Law of Thermodynamics) questions in ACSEE (Form 6) Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Heat (First Law of Thermodynamics) questions and exercises with answers

Showing questions 1–4 of 4.

An isobaric process and an isochoric process hold constant, respectively:Read the answer and worked solution →1 g of water (1 cm³) becomes 1671 cm³ of steam at $1.013\times10^5$ Pa. The external work done is about:Read the answer and worked solution →Which quantity is held constant?Read the answer and worked solution →Work done by expanding steamRead the answer and worked solution →

Worked practice questions

An isobaric process and an isochoric process hold constant, respectively:

pressure and volume
volume and pressure
pressure and temperature
temperature and volume

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Correct answer: A. pressure and volume

1. The prefix iso- means equal, and the rest of each word names the quantity held fixed. 2. Isobaric comes from baros, meaning pressure, so pressure is constant. 3. Isochoric comes from choros, meaning volume, so volume is constant. 4. In an isochoric process no volume change occurs, so no external work is done. 5. Describing these two interchangeably, which the report records, loses that distinction entirely. _Source: NECTA ACSEE 2023 Physics 131/1, Question 6: Heat (First law of Thermodynamics)_

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1 g of water (1 cm³) becomes 1671 cm³ of steam at $1.013\times10^5$ Pa. The external work done is about:

1690 J
1013 J
0.169 J
169 J

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Correct answer: D. 169 J

1. Work done against a constant external pressure is $W=P\Delta V$. 2. The volume change is $\Delta V=1671-1=1670$ cm³. 3. Convert to SI: $1670\text{ cm}^3=1670\times10^{-6}=1.670\times10^{-3}$ m³. 4. So $W=1.013\times10^5\times1.670\times10^{-3}$. 5. That gives about $169$ J. Forgetting the cubic-centimetre conversion shifts the answer by a factor of 1000. _Source: NECTA ACSEE 2023 Physics 131/1, Question 6: Heat (First law of Thermodynamics)_

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Which quantity is held constant?

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Items

Item
Isobaric
Category
Pressure
Item
Constant pressure
Category
Pressure
Item
Isochoric
Category
Volume
Item
No work done
Category
Volume
Item
Isothermal
Category
Temperature
Item
Boyle's law
Category
Temperature

Categories

Item
Pressure
Item
Volume
Item
Temperature

Instructions

Tap a process, then the quantity it holds constant.

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