JAMB and WAEC Physics questions: Liquids at rest

24 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

   Show answer

   Explanation and discussion

2. Question 2· Liquids at rest· JAMB

   A hydrometer works on the principle of

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

   Show answer

   Explanation and discussion

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

   Show answer

   Explanation and discussion

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

   Show answer

   Explanation and discussion

5. Question 5· Liquids at rest· WAEC

   A substance has a relative density of 2.7. This means that it is

   • A2.7 kg in mass
   • B2.7 times lighter than water
   • C2.7 times as dense as water
   • D2.7 times as dense as air

   Show answer

   Explanation and discussion

6. Question 6· 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

   Show answer

   Explanation and discussion

7. Question 7· 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

   Show answer

   Explanation and discussion

8. Question 8· Liquids at rest· WAEC

   A ship floats higher in sea water than in fresh water because sea water

   • Ais deeper
   • Bis warmer
   • Cis denser
   • Dhas waves

   Show answer

   Explanation and discussion

9. Question 9· Liquids at rest· JAMB

   Surface tension explains why

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

   Show answer

   Explanation and discussion

10. Question 10· Liquids at rest· WAEC

    A body weighs 50 N in air and 30 N when fully immersed in water. Find the upthrust on it.

    • A80 N
    • B20 N
    • C30 N
    • D50 N

    Show answer

    Explanation and discussion

11. Question 11· Liquids at rest· WAEC

    A stone weighs 0.6 N in air and 0.4 N in water. Find its relative density.

    • A3
    • B1.5
    • C0.33
    • D2

    Show answer

    Explanation and discussion

12. Question 12· 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

    Show answer

    Explanation and discussion

13. Question 13· Liquids at rest· WAEC

    The relative density of the body above (10 N in air, 6 N in water) is

    • A2.5
    • B1.67
    • C0.6
    • D4

    Show answer

    Explanation and discussion

14. Question 14· 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

    Show answer

    Explanation and discussion

15. Question 15· Liquids at rest· WAEC

    A body floats in a liquid when its weight is equal to the

    • Aupthrust on it
    • Bvolume of the liquid
    • Cmass of the container
    • Ddensity of the liquid

    Show answer

    Explanation and discussion

16. Question 16· Liquids at rest· WAEC

    A body floats in a liquid when

    • Aits weight equals the upthrust on it
    • Bits weight is greater than the upthrust
    • Cit is denser than the liquid
    • Dit has no weight

    Show answer

    Explanation and discussion

17. Question 17· Liquids at rest· WAEC

    A body weighs 10 N in air and 6 N when fully immersed in water. The upthrust is

    • A6 N
    • B16 N
    • C4 N
    • D10 N

    Show answer

    Explanation and discussion

18. Question 18· Liquids at rest· JAMB

    A hydrometer floats higher in a liquid that

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

    Show answer

    Explanation and discussion

19. Question 19· Liquids at rest· WAEC

    The relative density of a substance of density 2,700 kg/m³ is

    • A2.7
    • B2,700
    • C0.27
    • D27

    Show answer

    Explanation and discussion

20. Question 20· 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

    Show answer

    Explanation and discussion