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Important questions on Problems On Pascals Law

The height of mercury which exerts the same pressure as 20 cm of a water column, is equal to

A

cm

B

cm

C

cm

D

none of these

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The gauge pressure of N/m must be maintained in the main water pipes of a city. How much work must be done to pump m of water at a pressure of N/m -

A

J

B

J

C

J

D

J

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Answer the following question in brief.
Why do the load carrying heavy vehicles have large number of wheels?

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The areas of the pistons in a hydraulic machine are and . What force on the smaller piston will support a load of on the larger piston?

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A hydraulic machine exerts a force of on a piston of diameter . The output force is exerted on a piston of diameter . What will be the output force?

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State whether true or false:
The deeper an underwater swimmer goes, the more strongly the water pushes on his body and the greater is the pressure that he experiences.

A

True

B

False

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In the diagram the area of cross section of the pistons and are and respectively then the thrust on the piston at is

A

B

C

D

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In hydraulic machine, the two pistons are of area of cross section in the ratio . What force is needed on the narrow piston to overcome a force of on the wider piston?

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A force of is applied to the smaller piston of a hydraulic machine. Neglecting friction, find the force exerted on the large piston, the diameters of the piston being and respectively.

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The radii of the press plunger and the pump plunger are in the ratio . If an effort of acts on the pump plunger. Find the maximum effort the press plunger can overcome.  ( in kgf)

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