Telangana SCERT Class 9 Physical Science Chapter 8 Solution – Floating Bodies. Here in this post we provides Class 9 Physical Science Floating Bodies Telangana State Board Solution. Telangana State Board English Class IX Medium Students can download this Solution to Solve out Improve Your Learning Questions and Answers.
Telangana State Board Class 9 Physical Science Chapter 8 Floating Bodies Solution:
CHAPTER: – 8.
Reflections on concepts –
1) Why do some objects floats on the water? And some sink? (AS1)
Ans: – We see that some object float on water and some sink this happen because of the density difference of the different object. As if any object has more density that water then it will be float on the water not sink in that.
2) Explain density and relative density and write their formulae. (AS1)
Ans: – The density and relative density are different things as the relative density is measure by the comparison of that object to with the density of water at 4℃. And the density is the ratio of the mass of that object to its volume.
3) Explain buoyancy in your own words. (AS1)
Ans: – Any object which is pressed by some object always try to overcome this pressure by exerting the opposite forces this force of reaction of that object is known as the buoyancy of any object.
4) How can you find the relative density of a liquid? (AS3)
Ans: – The relative density is known as the ratio of the density of that object to the density of water at 4℃. The term normal density and relative density are different things.
Relative density = (Object density/water density at 4℃).
5) Draw the diagram of a mercury barometer. (AS5)
Application of concepts
1) A solid sphere has a radius of 2 cm and a mass of 0.05 kg. What is the relative density of the sphere?
Ans: – Density = mass / volume = 0.005×10^3 / (4/3π×2^3) = 1.49 g/cm^3.
Relative density= (density of object/ density of water)
2) A small bottle weighs 20 g when empty and 22 g when filled with water. When it is filled with oil it weighs 21.76 g. What is the density of oil? (AS1)
3) An ice cube floats on the surface of water filled in glass tumbler (density ofice = 0.9 g/cm3). Will the water level in the glass rise? When the ice melts completely (AS1)
Ans: – when the ice cube melt then it will increase the volume of the glass tumbler. As the shape of the glass is set for the certain capacity so the water will ne overflow when excess water will come because of the melting of ice.
4) Find the pressure at a depth of 10m in water if the atmospheric pressure is 100kPa.
[1Pa=1N/m2] [100kPa = 105 Pa = 105 N/m2 = 1 atm.]
Higher Order Thinking Questions
1) Can you make iron to float in water? How? (AS3)
Ans: – The iron will not be floating on the water as the weight of the iron is much higher than of the water so it will sink in water. The gravity also played an important role for the sinking of iron in water.
2) here do you observe Archimedes principle in daily life? Give two examples. (AS7)
Ans: – The daily example of Archimedes principal is- the floating of mug in water, the floating of food grain after soaking of water.
3) Do all objects that sink in water, sink in oil? Give reason. (AS1)
Ans: – The floating or sinking of all object in water is not possible as the density of different object is different so some times it will be high than water then the object will float and if low then sink.
MULTIPLE CHOICE QUESTIONS.
1.) Unit of relative density is
a) g/cm3 b) cm/g3 c) N/m2 d) No units.
Ans: – Option (a).
2.) The instrument used to measure the purity of milk is
a) Barometer b) Hygrometer c) Lactometer d) Speedometer.
Ans: – option (c).
3.) If P0 = Pressure, ñ = Density, h= height, and g = acceleration due to gravity then the atmospheric pressure =
a) P0 = ñhg b) P0= mgh c) P0 = vgh d) P0 = ½ mgh.
Ans: – option (a).
4.) The first barometer with mercury was invented by
a) Pascal b) Archimedes c) Newton d) Torricelli.
Ans: – options (d).
5.) The hydraulic jack which is used in automobile work shops, works on the principleof
a) Archimedes b) Pascal c) Torricelli d) Newton.
Ans: – option b.
6.) The density of water at 25℃ is
a) 1g/cm3 b) 2g/cm3 c) 3g/cm3 d) 0.99g/cm3.
Ans: – option (d).