WAEC Physics questions

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

1. Question 201· 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°

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2. Question 202· 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

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3. Question 203· 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

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4. Question 204· 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

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5. Question 205· 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

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6. Question 206· 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

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7. Question 207· 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

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8. Question 208· 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

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9. Question 209· 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

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10. Question 210· 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

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11. Question 211· Liquids at rest· WAEC

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

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

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12. Question 212· Liquids at rest· WAEC

    A hydrometer sinks deeper in a liquid that is

    • Aless dense
    • Bmore dense
    • Chotter
    • Dcoloured

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13. Question 213· Liquids at rest· WAEC

    By the law of flotation, a floating body displaces

    • Ahalf its weight of the fluid
    • Bits own volume of the fluid
    • Cits own weight of the fluid
    • Dmore than its own weight of the fluid

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14. Question 214· Magnets and magnetic fields· WAEC

    Which of the following materials is strongly attracted by a magnet?

    • AIron
    • BCopper
    • CAluminium
    • DBrass

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15. Question 215· Magnets and magnetic fields· WAEC

    A bar magnet can be demagnetised by

    • Ahammering it while it lies east-west
    • Bstroking it with another magnet
    • Cplacing it in a solenoid carrying direct current
    • Dstoring it with keepers

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16. Question 216· Magnets and magnetic fields· WAEC

    Which of these is a magnetic material?

    • Aaluminium
    • Bcopper
    • Cnickel
    • Dbrass

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17. Question 217· Magnets and magnetic fields· WAEC

    The angle between the magnetic meridian and the geographic meridian is called the

    • Adip
    • Bdeclination
    • Cinclination
    • Ddeviation

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18. Question 218· Magnets and magnetic fields· WAEC

    A magnet is best demagnetised by

    • Awithdrawing it slowly from a solenoid carrying alternating current
    • Bplacing it in a north–south direction
    • Cstoring it with keepers
    • Dcooling it

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19. Question 219· Magnets and magnetic fields· WAEC

    The angle between the magnetic and geographic meridians is the

    • Aangle of incidence
    • Bangle of dip
    • Ccritical angle
    • Dangle of declination

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20. Question 220· Magnets and magnetic fields· WAEC

    Soft iron keepers are placed across the poles of stored bar magnets to

    • Areverse their poles
    • Bmake them stronger permanently
    • Cprevent them losing their magnetism
    • Dmake them lighter

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