WAEC Physics questions: Quantity of heat

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

1. Question 1· 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

2. Question 2· 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

3. Question 3· 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

4. Question 4· 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

5. Question 5· 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

6. Question 6· 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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   Explanation and discussion

7. Question 7· 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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8. Question 8· 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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9. Question 9· 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

10. Question 10· 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

11. Question 11· 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