WAEC Physics questions

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

1. Question 321· Sound waves· WAEC

   The range of frequencies that the human ear can hear is about

   • A20 Hz to 20,000 Hz
   • B2 Hz to 200 Hz
   • C200 Hz to 2,000,000 Hz
   • D0 Hz to 20 Hz

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2. Question 322· Sound waves· WAEC

   A man hears an echo 2 s after shouting in front of a cliff. If sound travels at 340 m/s, the cliff is

   • A170 m away
   • B680 m away
   • C340 m away
   • D1,360 m away

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   Explanation and discussion

3. Question 323· Sound waves· WAEC

   Sound travels fastest in

   • Asteel
   • Bwater
   • Cair
   • Da vacuum

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4. Question 324· Sound waves· WAEC

   Two guitar strings sound the same note, but one is louder. The notes differ in

   • Aamplitude
   • Bfrequency
   • Cpitch
   • Dwavelength

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5. Question 325· Sound waves· WAEC

   The first harmonic of a closed pipe of length 0.85 m (speed of sound 340 m/s) has frequency

   • A50 Hz
   • B200 Hz
   • C400 Hz
   • D100 Hz

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6. Question 326· Sound waves· WAEC

   Why can astronauts on the moon not hear each other directly without radios?

   • ASound needs a material medium and there is no air
   • BThe moon is too cold for sound
   • CSound travels too fast there
   • DTheir voices are too weak

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7. Question 327· Sound waves· WAEC

   A boy hears the echo of his shout from a cliff 1 s after shouting. If sound travels at 340 m/s, how far away is the cliff?

   • A340 m
   • B85 m
   • C680 m
   • D170 m

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8. Question 328· Sound waves· WAEC

   Sound cannot travel through

   • Awater
   • Ba vacuum
   • Cair
   • Dsteel

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9. Question 329· Sound waves· WAEC

   A girl claps in front of a wall and hears the echo 1.2 s later. If sound travels at 340 m/s, how far is the wall?

   • A102 m
   • B408 m
   • C283 m
   • D204 m

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10. Question 330· Sound waves· WAEC

    The pitch of a note depends on its

    • Aamplitude
    • Bfrequency
    • Cspeed
    • Dquality

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11. Question 331· Temperature and its measurement· WAEC

    A thermocouple thermometer is suitable for measuring

    • Aliquid density
    • Bbody temperature only
    • Croom temperature only
    • Dvery high and rapidly changing temperatures

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12. Question 332· Temperature and its measurement· WAEC

    Mercury is used in thermometers because it

    • Ais colourless
    • Bexpands uniformly and does not wet glass
    • Cfreezes at 0 °C
    • Dis a poor conductor of heat

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13. Question 333· Temperature and its measurement· WAEC

    Express 27 °C on the kelvin scale.

    • A246 K
    • B300 K
    • C27 K
    • D327 K

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14. Question 334· Temperature and its measurement· WAEC

    Convert 300 K to degrees Celsius.

    • A−27 °C
    • B573 °C
    • C27 °C
    • D300 °C

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15. Question 335· Temperature and its measurement· WAEC

    Mercury is used in thermometers mainly because it

    • Ais cheap
    • Bexpands evenly and does not wet glass
    • Cfreezes at 0 °C
    • Dis a poor conductor of heat

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16. Question 336· Temperature and its measurement· WAEC

    Six's maximum and minimum thermometer records

    • Atemperatures above 1,000 °C
    • Bbody temperature only
    • Cthe boiling point of liquids
    • Dthe highest and lowest temperatures over a period

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17. Question 337· Temperature and its measurement· WAEC

    The upper fixed point of the Celsius scale is the temperature of

    • Amelting ice
    • Bboiling sea water
    • Csteam from pure water boiling at standard pressure
    • Dthe human body

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18. Question 338· Temperature and its measurement· WAEC

    Convert 27 °C to kelvin.

    • A327 K
    • B246 K
    • C27 K
    • D300 K

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    Explanation and discussion

19. Question 339· Temperature and its measurement· WAEC

    A property used to measure temperature must

    • Abe magnetic
    • Bstay constant
    • Cdepend on mass only
    • Dvary continuously and measurably with temperature

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20. Question 340· Temperature and its measurement· WAEC

    Convert 104 °F to degrees Celsius.

    • A40 °C
    • B72 °C
    • C58 °C
    • D25 °C

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    Explanation and discussion