JAMB Physics questions: Quantity of heat

13 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· JAMB

   The SI unit of specific heat capacity is

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

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4. Question 4· 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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5. Question 5· 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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6. Question 6· 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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7. Question 7· 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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8. Question 8· 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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9. Question 9· 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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10. Question 10· Quantity of heat· JAMB

    Water is used in car radiators mainly because it has a

    • Ahigh density
    • Blow boiling point
    • Chigh specific heat capacity
    • Dlow freezing point

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11. Question 11· Quantity of heat· JAMB

    0.5 kg of water at 80 °C is mixed with 0.5 kg of water at 20 °C. Find the final temperature, ignoring heat losses.

    • A100 °C
    • B60 °C
    • C40 °C
    • D50 °C

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12. Question 12· Quantity of heat· JAMB

    A 200 g piece of metal at 100 °C is dropped into 100 g of water at 20 °C. The final temperature is 30 °C. Find the specific heat capacity of the metal, ignoring heat losses. (c of water = 4200 J/(kg K))

    • A150 J/(kg K)
    • B600 J/(kg K)
    • C4200 J/(kg K)
    • D300 J/(kg K)

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13. Question 13· Quantity of heat· JAMB

    A 0.2 kg metal at 100 °C is put into 0.5 kg of water at 20 °C, and the final temperature is 25 °C. Find the specific heat capacity of the metal. [c of water = 4200 J/kg K]

    • A1,400 J/kg K
    • B700 J/kg K
    • C350 J/kg K
    • D525 J/kg K

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    Explanation and discussion