Nidhi pushed the plunger of syringe completely and dipped its needle i...
When plunger is pushed down, the air inside the syringe is pushed out, creating an empty space. When the plunger is pulled up the water rushes up to take the empty space due to the air pressure acting on it outside the syringe.
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Nidhi pushed the plunger of syringe completely and dipped its needle i...
Nidhi pushed the plunger of syringe completely and dipped its needle in water.
When Nidhi pushed the plunger of the syringe completely and dipped its needle in water, it created a sealed chamber inside the syringe. The plunger is a movable part of the syringe that helps in controlling the flow of liquids or gases. By pushing the plunger down, Nidhi increased the pressure inside the syringe.
Water will move in the syringe when she pushed the plunger down due to air pressure.
When Nidhi pushed the plunger down, the air inside the syringe got compressed. According to Boyle's law, when the volume of a gas decreases, its pressure increases. So, pushing the plunger down increased the air pressure inside the syringe. This increased air pressure pushed the water into the syringe due to the difference in pressure between the inside and outside of the syringe. Therefore, option a) is correct.
When she pushed the plunger down all the air moved out creating an empty space in the syringe.
When Nidhi pushed the plunger down completely, it expelled all the air present inside the syringe. This created an empty space or vacuum inside the syringe. The plunger acted as a barrier, preventing the air from re-entering the syringe. Therefore, option b) is correct.
Air outside the syringe exerted pressure on water causing it to move in when the plunger is pulled up.
When Nidhi slowly pulled the plunger while its needle was still immersed in water, the air pressure outside the syringe exerted force on the water. As the plunger was pulled up, the volume inside the syringe increased, causing the air pressure inside to decrease. This decrease in pressure allowed the higher air pressure outside the syringe to push the water back into the syringe. Therefore, option c) is correct.
Conclusion
In conclusion, when Nidhi pushed the plunger of the syringe down, the air pressure inside increased and pushed the water into the syringe. When she pulled the plunger up, the decrease in air pressure inside allowed the higher air pressure outside to push the water back into the syringe. Therefore, both options b) and c) are correct, making option d) the correct answer.
Nidhi pushed the plunger of syringe completely and dipped its needle i...
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