Physics Pressure in Fluids and Atmospheric Pressure Exercise4b
Please Select
Q1 What do you understand by atmospheric pressure?
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Q2 Write the numerical value of the atmospheric pressure on the surface of the earth in Pascal.
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Q3 What physical quantity is measured in torr? How is it related to the S.I unit of the quantity?
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Q4 Name the physical quantity which is expressed in the unit ‘atm’. State its value in pascal.
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Q5 We do not feel uneasy even under the enormous pressure of atmosphere above as well as around us. Give a reason.
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Q6 Describe an experiment to demonstrate that air exerts pressure.
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Q7 Explain the following:
(i) A balloon collapses when air is removed from it.
(ii) Water does not run out of a dropper unless its rubber bulb is pressed.
(iii) Two holes are made in a completely filled sealed tin can to take out oil from it
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Q8 Why does the liquid rise in a syringe when its piston is pulled up?
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Q9 How is water drawn up from a well by a water pump?
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Q10 A partially inflated balloon is placed inside a bell jar connected to a vaccum pump. On creating vaccum inside the bell jar, balloon gets more inflated. How does the pressure change: increase, decrease or remains same, inside the (a) bell jar and (b) balloon?
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Q11 What is the purpose of a barometer?
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Q12 What is a barometer? How is a simple barometer constructed?
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Q13 Explain how is the height of mercury column in the tube of a simple barometer, a measure of the atmospheric pressure.
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Q14 Illustrate with the help of a labelled diagram of a simple barometer that the atmospheric pressure at a place is 76cm of Hg.
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Q15 Why is the barometric height used as a unit to express the atmospheric pressure?
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Q16 What is meant by the statement ‘the atmospheric pressure at a place is 76cm of Hg’? State its value in Pa.
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Q17 How will you show there is vaccum above the surface of mercury in a barometer? What name is given to this vaccum?
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Q18 How is the barometric height of a simple barometer affected if
(a) Its tube is pushed down into the trough of mercury?
(b) Its tube is slightly tilted from vertical?
(c) A drop of liquid is inserted inside the tube?
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Q19 State two uses of a barometer.
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Q20 Give two reasons for the use of mercury as a barometric liquid.
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Q21 Give two reasons why water is not a suitable barometric liquid
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Q22 Mention two demerits of a simple barometer and state how they are removed in a Fortin barometer.
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Q23 Draw a simple labelled diagram of a Fortin barometer and state how it is used to measure the atmospheric pressure.
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Q24 What is an aneroid barometer? Draw a neat and labelled diagram to explain its construction and working.
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Q25 State two advantages of an aneroid barometer over a simple barometer.
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Q26 How is the reading of a barometer affected when it is taken to (i) a mine, and (ii) a hill?
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Q27 How does atmospheric pressure change with altitude? Draw an approximate graph to show this variation.
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Q28 State two factors which affect the atmospheric pressure as we go up.
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Q29 Why does a fountain pen leak at a high altitude?
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Q30 Why does nose start bleeding on high mountains?
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Q31 What is an altimeter? State its principle. How is its scale calibrated?
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Q32 What do the following indicate in a barometer regarding weather:
(a) Gradual fall in the mercury level
(b) Sudden fall in the mercury level
(c) Gradual rise in the mercury level?
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Multiple Choice type Questions :
Q1 The unit torr is related to the barometric height as:
(a) 1 torr = 1cm of Hg
(b) 1 torr = 0.76cm of Hg
(c) 1 torr=1mm of Hg
(d) 1 torr=1m of Hg
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Q2 The normal atmospheric pressure is:
(a) 76m of Hg
(b) 76cm of Hg
(c) 76 Pa
(d) 76 Nm-2
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Q3 The atmospheric pressure at earth surface is P1 and inside mine is P2. They are related as:
(a) P1 = P2
(b) P1 > P2
(c) P1 < P2
(d) P2 = 0
Solution :
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