JAMB and WAEC Physics questions: Quantity of heat

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

1. Question 1· Quantity of heat· JAMB

   Find the heat needed to raise the temperature of 3 kg of aluminium by 10 K. (c = 900 J/(kg K))

   • A27 000 J
   • B2700 J
   • C9000 J
   • D270 J

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   Explanation and discussion

2. Question 2· Quantity of heat· JAMB

   The heat required to raise the temperature of 2 kg of water from 20 °C to 30 °C is: (specific heat capacity of water = 4200 J/kg K)

   • A8400 J
   • B42 000 J
   • C84 000 J
   • D4200 J

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   Explanation and discussion

3. Question 3· Quantity of heat· WAEC

   The heat capacity of a body is

   • Aits latent heat
   • Bits mass times density
   • Cthe heat needed to raise its temperature by 1 K
   • Dits temperature

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   Explanation and discussion

4. Question 4· Quantity of heat· JAMB

   The SI unit of specific heat capacity is

   • AJ/K
   • BJ/(kg K)
   • CJ/kg
   • DW/m²

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   Explanation and discussion

5. Question 5· Quantity of heat· WAEC

   Heat needed to raise 2 kg of water by 10 K (c = 4200 J/kg K) is

   • A8,400 J
   • B42,000 J
   • C84,000 J
   • D840 J

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   Explanation and discussion

6. Question 6· Quantity of heat· JAMB

   How long does a 2 kW kettle take to heat 1.5 kg of water from 25 °C to 100 °C if no heat is lost? [c = 4200 J/kg K]

   • A157 s
   • B236 s
   • C315 s
   • D472 s

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   Explanation and discussion

7. Question 7· Quantity of heat· WAEC

   Coastal towns such as Lagos have smaller daily temperature changes than inland towns because water has a

   • Alow specific heat capacity
   • Bhigh specific heat capacity
   • Chigh density
   • Dlow boiling point

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   Explanation and discussion

8. Question 8· Quantity of heat· WAEC

   A 500 W heater is switched on for 2 minutes. How much heat does it produce?

   • A60 000 J
   • B1000 J
   • C250 J
   • D30 000 J

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   Explanation and discussion

9. Question 9· Quantity of heat· WAEC

   How much heat is needed to raise 2 kg of water from 20 °C to 70 °C? [specific heat capacity of water = 4200 J/kg K]

   • A8400 J
   • B420 000 J
   • C210 000 J
   • D588 000 J

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   Explanation and discussion

10. Question 10· Quantity of heat· WAEC

    Water is used as a coolant in car radiators because it has a

    • Alow boiling point
    • Bhigh specific heat capacity
    • Clow density
    • Dhigh expansivity

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11. Question 11· Quantity of heat· JAMB

    The method of mixtures for finding specific heat capacity is based on the principle that

    • Aall bodies have the same specific heat
    • Bheat always rises
    • Cheat lost by the hot body equals heat gained by the cold body
    • Dtemperature equals heat

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12. Question 12· Quantity of heat· JAMB

    Find the heat capacity of a 2 kg block with specific heat capacity 400 J/(kg K).

    • A800 J/K
    • B200 J/K
    • C400 J/K
    • D1600 J/K

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    Explanation and discussion

13. Question 13· Quantity of heat· WAEC

    The quantity of heat needed to raise the temperature of a whole body by 1 K is its

    • Aspecific heat capacity
    • Bheat capacity
    • Clatent heat
    • Dthermal conductivity

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14. Question 14· Quantity of heat· JAMB

    The method of mixtures assumes that

    • Aheat lost by hot bodies equals heat gained by cold bodies
    • Bno heat is gained
    • Cthe temperature stays constant
    • Dthe mass changes

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15. Question 15· Quantity of heat· WAEC

    200 g of water at 80 °C is mixed with 300 g of water at 30 °C. Find the final temperature if no heat is lost.

    • A60 °C
    • B55 °C
    • C50 °C
    • D45 °C

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16. Question 16· Quantity of heat· WAEC

    Find the heat capacity of a 0.5 kg block whose specific heat capacity is 900 J/kg K.

    • A450 J/K
    • B1800 J/K
    • C900 J/K
    • D0.00056 J/K

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    Explanation and discussion

17. Question 17· Quantity of heat· JAMB

    A 1 kW heater warms 2 kg of water for 7 minutes with no heat losses. Find the rise in temperature. (c = 4200 J/(kg K))

    • A7 K
    • B25 K
    • C50 K
    • D100 K

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18. Question 18· Quantity of heat· WAEC

    How much heat is needed to raise the temperature of 2 kg of water by 10 °C? (specific heat capacity of water = 4,200 J/kg K)

    • A42,000 J
    • B8,400 J
    • C84,000 J
    • D21,000 J

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    Explanation and discussion

19. Question 19· Quantity of heat· JAMB

    How much heat is needed to raise the temperature of 500 g of water by 20 K? (c = 4200 J/(kg K))

    • A420 000 J
    • B4200 J
    • C42 000 J
    • D2100 J

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    Explanation and discussion

20. Question 20· Quantity of heat· WAEC

    Find the heat needed to raise the temperature of 0.5 kg of copper by 40 °C. (c = 400 J/kg K)

    • A8,000 J
    • B800 J
    • C20,000 J
    • D80,000 J

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    Explanation and discussion