JAMB Physics questions: Liquids at rest

13 questions with answers and explanations. Tap an option to check yourself.

1. Question 1· Liquids at rest· JAMB

   A body weighs 10 N in air and 6 N when fully immersed in water. Find the upthrust on it.

   • A10 N
   • B16 N
   • C6 N
   • D4 N

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2. Question 2· Liquids at rest· JAMB

   A hydrometer works on the principle of

   • APascal's principle
   • Bmoments
   • Cconservation of energy
   • Dflotation

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3. Question 3· Liquids at rest· JAMB

   A hydrometer floats deeper in liquid X than in water. This shows that X is

   • Aa solid
   • Bdenser than water
   • Cthe same density as water
   • Dless dense than water

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4. Question 4· Liquids at rest· JAMB

   Archimedes' principle states that a body wholly or partly immersed in a fluid

   • Afloats only if it is hollow
   • Bloses all its weight
   • Cexperiences an upthrust equal to the weight of fluid displaced
   • Dsinks if it is solid

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5. Question 5· Liquids at rest· JAMB

   A body weighs 10 N in air and 6 N when fully immersed in water. Find its relative density.

   • A4
   • B1.67
   • C0.4
   • D2.5

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6. Question 6· Liquids at rest· JAMB

   A piece of wood of density 600 kg/m³ floats in water of density 1000 kg/m³. What fraction of its volume is under the water?

   • A0.6
   • B0.4
   • C1.67
   • D0.06

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7. Question 7· Liquids at rest· JAMB

   Surface tension explains why

   • Aice floats
   • Ba ship floats
   • Ca balloon rises
   • Da dry needle can float on water

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8. Question 8· Liquids at rest· JAMB

   A block of wood of density 600 kg/m³ floats in water. What fraction of its volume is submerged?

   • A0.6
   • B0.4
   • C1.0
   • D0.06

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9. Question 9· Liquids at rest· JAMB

   A ship floats because

   • Asteel is lighter than water
   • Bit displaces a weight of water equal to its own weight
   • Cair pushes it up
   • Dit has no weight

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10. Question 10· Liquids at rest· JAMB

    A hydrometer floats higher in a liquid that

    • Ais hotter
    • Bis less dense
    • Cis denser
    • Dhas more volume

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11. Question 11· Liquids at rest· JAMB

    A block of volume 0.002 m³ is completely submerged in water of density 1000 kg/m³. Find the upthrust on it.

    • A200 N
    • B2 N
    • C20 N
    • D0.2 N

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12. Question 12· Liquids at rest· JAMB

    An object floats in a liquid when:

    • Aits density is greater than that of the liquid
    • Bthe upthrust equals its weight
    • Cthe upthrust is less than its weight
    • Dits volume is small

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13. Question 13· Liquids at rest· JAMB

    A density bottle has a mass of 20 g empty, 70 g full of water and 60 g full of a liquid. Find the relative density of the liquid.

    • A0.86
    • B1.25
    • C0.8
    • D1.17

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    Explanation and discussion