मराठी
सी.आई.एस.सी.ई.आयसीएसई ICSE Class 8

A Piece of Wood Floats on Water. the Buoyant Force on Wood Will Be Zero More than the Weight of the Wood Piece Equal to the Weight of the Wood Piece

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प्रश्न

A piece of wood floats on water. The buoyant force on wood will be

पर्याय

  • zero

  • more than the weight of the wood piece

  • equal to the weight of the wood piece

  • less than the weight of the wood piece.

MCQ
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उत्तर

equal to the weight of the wood piece.

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पाठ 2: Physical Quantities and Measurement - Objective Questions [पृष्ठ ३३]

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एस.एस. शोम Concise Physics [English] Class 8 ICSE
पाठ 2 Physical Quantities and Measurement
Objective Questions | Q 4.7 | पृष्ठ ३३

संबंधित प्रश्‍न

The density of a body which sinks in water is ......... than 1000 Kg m-3.


Which of the following will sink or float on water? (Density of water = 1 g Cm-3)

body D having density 0.85 g m-3


Why does it happen?

A ship dips to a larger depth in fresh water as compared to marine water.


The diagram below in Fig. 4.12 shows a device which makes the use of the principle of transmission of pressure.

  1. Name the parts labelled by the letters X and Y.
  2. Describe what happens to valves A and B and to the quantity of water in the two cylinders when the lever arm is moved down.
  3. Give reasons for what happens to valves A and B in part (ii).
  4. What happens when the release valve is opened?
  5. What happens to valve B in cylinder P when the lever arm is moved up?
  6. Give a reason for your answer in part (v).
  7. State one use of the above device.

The pressure P1 at a certain depth in river water and P2 at the same depth in sea water are related as :


A block of iron of mass 7.5 kg and of dimensions 12 cm × 8 cm × 10 cm is kept on a table top on its base of side 12 cm × 8 cm.

Calculate:

  1. Thrust and
  2. Pressure exerted on the table top

Take 1 kgf = 10 N.


A body experiences an upthrust F1 in river water and F2 in sea water when dipped up to the same level. Which is more, F1 or F2? Give reason. 


The S.I. unit of upthrust is : 


The base of the cylindrical vessel measures 300 cm2. Water is poured into it up to a depth of 6 cm. Calculate the pressure of water on the base in the vessel.


The point at which the force of buoyancy is supposed to act is known as ______.


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