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Selina solutions
Grade 9 
Physics
Selina Solutions CONCISE subject class 9-ICSE-Physics
Chapter 5 Upthrust In Fluids Archimedes Principle And Floatation
Exercise 5C
Question 12
Physics
Selina Solutions CONCISE subject class 9-ICSE-Physics
Chapter 5 Upthrust In Fluids Archimedes Principle And Floatation
Exercise 5C
Question 12
Chapter 5 Upthrust In Fluids Archimedes Principle And Floatation | Exercise 5C
Question 12
CHAPTERS
1. Chapter 1 – Measurements and Experimentation
2. Chapter 2 Motion In One Dimension
4. Chapter 4 Pressure In Fluids And Atmospheric Pressure
5. Chapter 5 Upthrust In Fluids Archimedes Principle And Floatation
7. Chapter 7 Reflection Of Light
8. Chapter 8 Propogation Of Sound Waves
A balloon filled with helium gas floats in a big closed jar which is connected to an
evacuating pump. What will be your observation, if air from the jar is pumped out? Explain your answer
The balloon will sink.
The density of air in the jar decreases as the air is pumped out from the jar. Hence the upthrust on the balloon decreases. The balloon sinks as the weight of the balloon surpasses the upthrust acting on it
Question 12
A balloon filled with helium gas floats in a big closed jar which is connected to an
evacuating pump. What will be your observation, if air from the jar is pumped out? Explain your answer
The balloon will sink.
The density of air in the jar decreases as the air is pumped out from the jar. Hence the upthrust on the balloon decreases. The balloon sinks as the weight of the balloon surpasses the upthrust acting on it
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