1.Half of atmospheric pressure is: (MDCAT 2020)
- 400 torr
- 50662 Pa
- 1013 Pa
- 6.5 pounds
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Correct answer: (b) 50662 Pa
One atmosphere is 101325 Pa, so half of it is 50662 Pa.
Standard Temperature and Pressure MDCAT MCQs with answers
7 past paper MCQs on Standard Temperature and Pressure, from the Gases unit of MDCAT Chemistry. The year each question appeared is shown where known; tap “Show answer” for the correct option and a short solution.
2.Consider the equation H2 + O2 -> H2O, what volume of hydrogen gas is required to produce 1 mol of water at standard temperature & pressure? (UHS MDCAT 2025)
- 11.2 dm3
- 22.4 dm3
- 10 dm3
- 58 dm3
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Correct answer: (b) 22.4 dm3
One mole of water needs one mole of hydrogen, and a mole of any gas fills $22.4\,\mathrm{dm^3}$ at STP.
3.Select the standard condition for temperature and pressure: (SIBA MDCAT 2025)
- 1 atm and 0K
- 760 torr and 25°C
- 2 bar and 25°C
- 14.7 psi and 0°C
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Correct answer: (d) 14.7 psi and 0°C
Standard conditions are one atmosphere, that is $14.7\,\mathrm{psi}$, and $0^{\circ}\mathrm{C}$.
4.760 torr is equal to ____ Pascal (KMU MDCAT 2024)
- 1
- 76
- 760
- 101325
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Correct answer: (d) 101325
One atmosphere is $760\,\mathrm{torr}$, that is $101325\,\mathrm{Pa}$.
5.The SI unit for pressure is: (NUMS MDCAT 2023)
- mm of Hg
- Pascal
- Bar
- Torr
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Correct answer: (b) Pascal
The SI unit of pressure is the pascal, a newton per square metre.
6.Standard temperatue in Fahrenheit {°F) is: (PMC MDCAT 2022)
- -273°F
- 0°F
- 32°F
- 114°F
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Correct answer: (c) 32°F
Standard temperature is $0^{\circ}\mathrm{C}$, that is $32^{\circ}\mathrm{F}$.
7.1 atm is equal to the following EXCEPT: (PMC MDCAT 2022)
- 760 mm of Hg
- 76 cm of Hg
- 760 torr
- 1.47 psi
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Correct answer: (d) 1.47 psi
One atmosphere is $14.7\,\mathrm{psi}$, not $1.47$.