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Physics Past Questions and Answers

Topic: Pressure exerted by gas

Jamb Physics Questions - Pressure exerted by gas

Question 21:
The pressure of two moles of an ideal gas at a temperature of 27oC and volume 10-2m3 is
[R = 8.313 J mol-1K-1]
  • A 4.99 x 10<sup style='font-size: smaller;'>5</sup> Nm<sup style='font-size: smaller;'>-2</sup>
  • B 9.80 x 10<sup style='font-size: smaller;'>3</sup> Nm<sup style='font-size: smaller;'>-2</sup>
  • C 4.98 x 10<sup style='font-size: smaller;'>3</sup> Nm<sup style='font-size: smaller;'>-2</sup>
  • D 9.80 x 10<sup style='font-size: smaller;'>5</sup> Nm<sup style='font-size: smaller;'>-2</sup>
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Question 22:
Which of the following materials has an increase in resistance with temperature?
  • A Water
  • B Metals
  • C Wood
  • D Electrolyte
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Question 23:
A gas at a volume of V0 in a container at pressure P0 is compressed to one-fifth of its volume. What will be its pressure if the magnitude of its original temperature T is constant?
  • A P<sub style='font-size: smaller;'>0</sub>/5
  • B 4P<sub style='font-size: smaller;'>0</sub>/5
  • C P<sub style='font-size: smaller;'>0</sub>
  • D 5P<sub style='font-size: smaller;'>0</sub>
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Question 24:
The pressure of a given mass of a gas changes from 200Nm-2 to 120Nm-2 while the temperature drops from 127°C to -73°C. The ratio of the final volume to the initial volume is
  • A 2 : 5
  • B 5 : 4
  • C 5 : 2
  • D 4 : 5
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Question 25:
If the volume of a gas is recoded as 76cm3 at a temperature of 27°C with a pressure of 800mmHg. What will be the volume of the gas at S.T.P?
  • A 36.2cm<sup style='font-size: smaller;'>3</sup>
  • B 25.7cm<sup style='font-size: smaller;'>3</sup>
  • C 72.8cm<sup style='font-size: smaller;'>3</sup>
  • D 24.3cm<sup style='font-size: smaller;'>3</sup>
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