8th Class Science Force and Pressure Question Bank

done Force and Pressure Conceptive Subjective Problems Total Questions - 5

• question_answer1)
  Some magnets are brought in contact with a refrigerator. The magnets stick to the refrigerator because of (a) gravitational force     (b) magnetic force (c) electric force               (d) nuclear force
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• question_answer2)
  A gas at 298 K is shifted from a vessel of \[250c{{m}^{3}}\] capacity to that of 1L capacity. The pressure of the gas will ____ at constant temperature. (a) Become double (b) Becomes four times (c) Decrease to half of the original value (d) Decreases to one-fourth of the original value.
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• question_answer3)
  When a gas is compressed at constant temperature (a) The speeds of the molecules increase. (b) The collisions between the molecules increase. (c) The speeds of the molecules decrease. (d) The collisions between the molecules decrease.
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• question_answer4)
  A gas occupied a volume of 250 ml at 700 mm Hg pressure and\[{{250}^{o}}C.\]What additional pressure is required to reduce the gas volume to its 4/5th value at the same temperature?                      (a) 225 mm Hg                   (b) 175 mm Hg       (c) 150 mm Hg                   (d) 265 mm Hg
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• question_answer5)
  At constant temperature, in a given mass of a gas. (a) The ratio of pressure and volume always remains constant. (b) Volume always remains constant. (c) Pressure always remains constant. (d) The product of pressure and volume always remains constant.
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