WAEC Physics questions

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

1. Question 41· Current electricity· WAEC

   A potentiometer is preferred to a voltmeter for measuring e.m.f. because it

   • Ais smaller
   • Bis cheaper
   • Cdraws no current at balance
   • Dhas a scale

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2. Question 42· Current electricity· WAEC

   A wire of resistance 8 Ω is cut into two equal halves, which are then joined in parallel. Find the new resistance.

   • A8 Ω
   • B4 Ω
   • C16 Ω
   • D2 Ω

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3. Question 43· Current electricity· WAEC

   Find the combined resistance of 4 Ω and 12 Ω resistors connected in parallel.

   • A16 Ω
   • B3 Ω
   • C8 Ω
   • D48 Ω

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4. Question 44· Current electricity· WAEC

   What current flows through a 20 Ω resistor when the p.d. across it is 6 V?

   • A120 A
   • B0.3 A
   • C3.3 A
   • D26 A

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5. Question 45· Current electricity· WAEC

   The resistance of a wire is doubled when its

   • Atemperature falls
   • Barea is doubled
   • Clength is doubled
   • Ddiameter doubles

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6. Question 46· Dispersion of light and colours· WAEC

   A red object viewed in pure blue light appears

   • Ared
   • Bblack
   • Cblue
   • Dwhite

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7. Question 47· Dispersion of light and colours· WAEC

   When white light passes through a prism, the colour deviated most is

   • Ayellow
   • Bred
   • Cgreen
   • Dviolet

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8. Question 48· Dispersion of light and colours· WAEC

   White light is split into colours by a prism because

   • Alight is reflected
   • Bthe prism adds colour
   • Ceach colour is refracted by a different amount
   • Dthe colours are absorbed

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9. Question 49· Dispersion of light and colours· WAEC

   A green leaf appears green in white light because it

   • Aemits green light
   • Babsorbs green light
   • Creflects green light and absorbs the others
   • Drefracts green light

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10. Question 50· Dispersion of light and colours· WAEC

    The splitting of white light into its component colours is called

    • Areflection
    • Bdiffraction
    • Cdispersion
    • Dinterference

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11. Question 51· Dispersion of light and colours· WAEC

    Blue light and yellow light mixed together give

    • Ablack
    • Bgreen light
    • Cwhite light
    • Dorange light

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12. Question 52· Dispersion of light and colours· WAEC

    Which colour of light is deviated most by a glass prism?

    • Ayellow
    • Bred
    • Cviolet
    • Dgreen

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    Explanation and discussion

13. Question 53· Dispersion of light and colours· WAEC

    A red object viewed in blue light appears

    • Ared
    • Bblue
    • Cwhite
    • Dblack

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    Explanation and discussion

14. Question 54· Dispersion of light and colours· WAEC

    The band of colours obtained when white light passes through a prism is called a

    • Aimage
    • Brainbow arc
    • Cshadow
    • Dspectrum

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15. Question 55· Dispersion of light and colours· WAEC

    A red shirt is viewed in a room lit only by blue light. It appears

    • Awhite
    • Bred
    • Cblue
    • Dblack

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16. Question 56· Elasticity· WAEC

    The law stating that extension is proportional to the applied force, within the elastic limit, is

    • ABoyle's law
    • BNewton's first law
    • CHooke's law
    • DCharles' law

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17. Question 57· Elasticity· WAEC

    A spring extends 3 cm under a 6 N load. Its spring constant is

    • A2 N/m
    • B200 N/m
    • C18 N/m
    • D0.5 N/m

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18. Question 58· Elasticity· WAEC

    A spring of force constant 400 N/m is stretched 0.1 m. How much energy is stored in it?

    • A20 J
    • B4 J
    • C2 J
    • D40 J

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19. Question 59· Elasticity· WAEC

    A spring extends by 4 mm under a force of 20 N. What force produces an extension of 10 mm, within the elastic limit?

    • A25 N
    • B8 N
    • C80 N
    • D50 N

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20. Question 60· Elasticity· WAEC

    The point beyond which a stretched wire no longer returns to its original length when the load is removed is the

    • Abreaking point
    • Belastic limit
    • Czero point
    • Dneutral point

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