JAMB and WAEC Physics questions

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

1. Question 741· Temperature and its measurement· JAMB

   A temperature of 50 °C in kelvin is:

   • A223 K
   • B273 K
   • C323 K
   • D50 K

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   Answer: C. 323 K

   Explanation and discussion

2. Question 742· 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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   Answer: C. steam from pure water boiling at standard pressure

   Explanation and discussion

3. Question 743· Temperature and its measurement· WAEC

   Convert 27 °C to kelvin.

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

   Show answer

   Answer: D. 300 K

   Explanation and discussion

4. Question 744· 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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   Answer: D. vary continuously and measurably with temperature

   Explanation and discussion

5. Question 745· Temperature and its measurement· JAMB

   Express −73 °C on the Kelvin scale.

   • A346 K
   • B200 K
   • C−200 K
   • D73 K

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   Answer: B. 200 K

   Explanation and discussion

6. Question 746· Temperature and its measurement· WAEC

   Convert 104 °F to degrees Celsius.

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

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   Answer: A. 40 °C

   Explanation and discussion

7. Question 747· Thermal expansion· WAEC

   A thick glass cup may crack when hot water is poured into it because

   • Athe water is too heavy
   • Bglass contracts when heated
   • Cthe inner surface expands more than the outer surface
   • Dglass is a good conductor

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   Answer: C. the inner surface expands more than the outer surface

   Explanation and discussion

8. Question 748· Thermal expansion· WAEC

   Gaps are left between railway lines to

   • Adrain water
   • Breduce weight
   • Csave metal
   • Dallow for expansion in hot weather

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   Answer: D. allow for expansion in hot weather

   Explanation and discussion

9. Question 749· Thermal expansion· WAEC

   A metal rod 2 m long is heated through 50 K. If its linear expansivity is 1.2 × 10⁻⁵ K⁻¹, find the increase in length.

   • A1.2 × 10⁻⁴ m
   • B1.2 × 10⁻³ m
   • C6.0 × 10⁻³ m
   • D2.4 × 10⁻³ m

   Show answer

   Answer: B. 1.2 × 10⁻³ m

   Explanation and discussion

10. Question 750· Thermal expansion· JAMB

    A metal has a linear expansivity of 1.1 × 10⁻⁵ K⁻¹. Find its area expansivity.

    • A1.21 × 10⁻¹⁰ K⁻¹
    • B3.3 × 10⁻⁵ K⁻¹
    • C1.1 × 10⁻⁵ K⁻¹
    • D2.2 × 10⁻⁵ K⁻¹

    Show answer

    Answer: D. 2.2 × 10⁻⁵ K⁻¹

    Explanation and discussion

11. Question 751· Thermal expansion· JAMB

    Thermostats in electric irons usually use

    • Aa bimetallic strip
    • Ba mercury thermometer
    • Ca magnet
    • Da transformer

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    Answer: A. a bimetallic strip

    Explanation and discussion

12. Question 752· Thermal expansion· WAEC

    Because of the anomalous expansion of water, ponds freeze

    • Afrom the top downwards, so fish survive below
    • Bfrom the bottom upwards
    • Call at once
    • Dnever

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    Answer: A. from the top downwards, so fish survive below

    Explanation and discussion

13. Question 753· Thermal expansion· JAMB

    A metal rod 2 m long has a linear expansivity of 1.2 × 10⁻⁵ K⁻¹. Find its increase in length when heated through 50 K.

    • A2.4 × 10⁻³ m
    • B1.2 × 10⁻⁴ m
    • C1.2 × 10⁻³ m
    • D6 × 10⁻⁴ m

    Show answer

    Answer: C. 1.2 × 10⁻³ m

    Explanation and discussion

14. Question 754· Thermal expansion· JAMB

    Water has its maximum density at

    • A4 °C
    • B0 °C
    • C100 °C
    • D−4 °C

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    Answer: A. 4 °C

    Explanation and discussion

15. Question 755· Thermal expansion· JAMB

    A rod 1 m long with linear expansivity 2 × 10⁻⁵ K⁻¹ is heated through 100 K. Find its increase in length.

    • A2 × 10⁻⁵ m
    • B2 × 10⁻³ m
    • C2 × 10⁻² m
    • D0.2 m

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    Answer: B. 2 × 10⁻³ m

    Explanation and discussion

16. Question 756· Thermal expansion· JAMB

    Overhead electric cables sag more in hot weather because they

    • Aexpand
    • Bcontract
    • Cbecome heavier
    • Dlose their charge

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    Answer: A. expand

    Explanation and discussion

17. Question 757· Thermal expansion· JAMB

    The cubic expansivity of a solid is approximately

    • Athree times its linear expansivity
    • Bequal to its linear expansivity
    • Ctwice its linear expansivity
    • Dhalf its linear expansivity

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    Answer: A. three times its linear expansivity

    Explanation and discussion

18. Question 758· Thermal expansion· WAEC

    Why does a pond freeze from the top downwards?

    • AWater below 4 °C is less dense and stays at the surface
    • BIce is denser than water and sinks
    • CHeat is conducted quickly up through the water
    • DThe bottom of the pond is cooled first

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    Answer: A. Water below 4 °C is less dense and stays at the surface

    Explanation and discussion

19. Question 759· Thermal expansion· WAEC

    Ponds freeze from the top downwards because water is densest at

    • A4 °C
    • B0 °C
    • C100 °C
    • D−4 °C

    Show answer

    Answer: A. 4 °C

    Explanation and discussion

20. Question 760· Thermal expansion· WAEC

    The area expansivity of a solid is approximately

    • Atwice its linear expansivity
    • Bequal to its linear expansivity
    • Cthree times its linear expansivity
    • Dhalf its linear expansivity

    Show answer

    Answer: A. twice its linear expansivity

    Explanation and discussion