GROWTH DEVELOPMENT CHILD
SUMMATIVE ASSESSMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It increases to 166.7 L
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It increases by 16.67 L
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It decreases to 16.67 L
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It decreases by 16.67 L
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Detailed explanation-1: -A balloon is inflated with helium gas at room temperature of 25°C and at 1 bar pressure when its initial volume is 2.27L and allowed to rise in the air. As it rises in the air external pressure decreases and volume of the gas increases till finally it bursts when external pressure is 0.3 bar.
Detailed explanation-2: -If you press on the plunger, you increase the pressure of the air and thus the air in the balloon contracts or decreases its volume. You should have seen the air-filled balloon shrivel up and get smaller in size.
Detailed explanation-3: -A balance of forces: The pressure inside an inflated balloon is greater than the pressure outside it. The balloon is stable because the expanding force due to the pressure difference is balanced by the contracting force exerted by the surface tension of the rubber.
Detailed explanation-4: -According to Charles’s law, when the pressure of a gas is held constant, increasing its temperature increases its volume. The opposite is also true: decreasing the temperature of a gas decreases its volume. Therefore, taking a balloon from a warmer place to a cooler place will cause the balloon to shrink.