JAMB and WAEC Physics questions

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

1. Question 441· Light: refraction· WAEC

   The bending of light as it passes from one medium into another is

   • Areflection
   • Bdiffraction
   • Crefraction
   • Ddispersion

   Show answer

   Answer: C. refraction

   Explanation and discussion

2. Question 442· Light: refraction· WAEC

   A converging lens of focal length 10 cm forms an image of an object placed 15 cm from it at

   • A25 cm
   • B6 cm
   • C30 cm
   • D10 cm

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   Answer: C. 30 cm

   Explanation and discussion

3. Question 443· Light: refraction· WAEC

   Find the critical angle for water of refractive index 4/3.

   • A36.9°
   • B41.8°
   • C48.6°
   • D53.1°

   Show answer

   Answer: C. 48.6°

   Explanation and discussion

4. Question 444· Light: refraction· JAMB

   The refractive index of glass is 1.5. The speed of light in the glass is: (c = 3 × 10⁸ m/s)

   • A1.5 × 10⁸ m/s
   • B3 × 10⁸ m/s
   • C4.5 × 10⁸ m/s
   • D2 × 10⁸ m/s

   Show answer

   Answer: D. 2 × 10⁸ m/s

   Explanation and discussion

5. Question 445· Light: refraction· WAEC

   A coin lies at the bottom of water 12 cm deep. If the refractive index of water is 4/3, how deep does the coin appear?

   • A16 cm
   • B9 cm
   • C3 cm
   • D12 cm

   Show answer

   Answer: B. 9 cm

   Explanation and discussion

6. Question 446· Light: refraction· WAEC

   Light passes from air into glass of refractive index 1.5 at an angle of incidence of 30°. Find the angle of refraction.

   • A19.5°
   • B30°
   • C48.6°
   • D45°

   Show answer

   Answer: A. 19.5°

   Explanation and discussion

7. Question 447· Light: refraction· WAEC

   Water has a refractive index of 1.33. Find the speed of light in water. (c = 3 × 10⁸ m/s)

   • A3.99 × 10⁸ m/s
   • B2.26 × 10⁸ m/s
   • C1.33 × 10⁸ m/s
   • D4.0 × 10⁸ m/s

   Show answer

   Answer: B. 2.26 × 10⁸ m/s

   Explanation and discussion

8. Question 448· Light: refraction· JAMB

   Find the speed of light in a medium of refractive index 1.33. (c = 3 × 10⁸ m/s)

   • A4.4 × 10⁸ m/s
   • B3.99 × 10⁸ m/s
   • C1.33 × 10⁸ m/s
   • D2.26 × 10⁸ m/s

   Show answer

   Answer: D. 2.26 × 10⁸ m/s

   Explanation and discussion

9. Question 449· Light: refraction· JAMB

   A mirage seen on a hot road is caused by

   • Adiffraction of light
   • Breflection from water on the road
   • Crefraction and total internal reflection in layers of hot air
   • Dabsorption by the road

   Show answer

   Answer: C. refraction and total internal reflection in layers of hot air

   Explanation and discussion

10. Question 450· Light: refraction· JAMB

    Find the critical angle for a medium of refractive index 2.

    • A60°
    • B30°
    • C45°
    • D90°

    Show answer

    Answer: B. 30°

    Explanation and discussion

11. Question 451· Light: refraction· JAMB

    Total internal reflection occurs when light goes from a denser to a less dense medium and the angle of incidence

    • Aexceeds the critical angle
    • Bis zero
    • Cis always 45°
    • Dis less than the critical angle

    Show answer

    Answer: A. exceeds the critical angle

    Explanation and discussion

12. Question 452· 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

    Answer: D. 4 N

    Explanation and discussion

13. Question 453· Liquids at rest· JAMB

    A hydrometer works on the principle of

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

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    Answer: D. flotation

    Explanation and discussion

14. Question 454· 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

    Answer: D. less dense than water

    Explanation and discussion

15. Question 455· 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

    Answer: C. experiences an upthrust equal to the weight of fluid displaced

    Explanation and discussion

16. Question 456· 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

    Answer: C. 2.7 times as dense as water

    Explanation and discussion

17. Question 457· 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

    Answer: D. 2.5

    Explanation and discussion

18. Question 458· 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

    Answer: A. 0.6

    Explanation and discussion

19. Question 459· 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

    Answer: C. is denser

    Explanation and discussion

20. Question 460· 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

    Answer: D. a dry needle can float on water

    Explanation and discussion