NEWTONS LAW OF COOLING
  • 1. Newton’s law of cooling states that the rate of loss of heat of a body is directly proportional to
A) its specific heat capacity
B) its mass
C) its volume
D) The temperature difference between the body and the surroundings
  • 2. In Newton’s law of cooling, T s represents:
A) standard temperature
B) steam temperature
C) surface area
D) surrounding temperature
  • 3. Newton’s law of cooling is most accurate for
A) Absolute zero
B) small temperature differences
C) Melting processes
D) large temperature differences
  • 4. A body cools from 90°C to 70°C while the surrounding temperature is 30°C. The average excess temperature is
A) 40°C
B) 60°C
C) 20°C
D) 50°C
  • 5. Which factor increases the rate of cooling?
A) smaller surface area
B) vacuum surroundings
C) Larger temperature difference
D) lower emissivity
  • 6. A correction in calorimetry is needed because
A) Water changes mass
B) Thermometers are inaccurate
C) Heat is gained from the surroundings
D) Heat is lost to the surrounding
  • 7. A liquid cools faster when
A) Surface area decreases
B) Air movement increases
C) Air movement increases
D) Mass increases
  • 8. A hot body loses 300 J in 2 minutes. Find heat loss per second
A) 600 J/s
B) 1.5 J/s
C) 2.5 J/s
D) 150 J/s
  • 9. A body cools from 90°C to 85°C in 1 minute. What is the temperature drop
A) 15°C
B) 5°C
C) 10°C
D) 2°C
  • 10. A liquid at 70°C is in a room at 30°CIf k=0.05 per seconds, calculate the rate of cooling.
A) 3°C/s
B) 1°C/s
C) 2°C/s
D) 4°C/s
  • 11. The purpose of cooling correction is to obtain the:
A) Actual quantity of heat exchanged
B) Room temperature
C) Lowest temperature
D) Mass of the calorimeter
  • 12. Cooling correction is applied in calorimetry because
A) The calorimeter changes colour
B) Water evaporates completely
C) The thermometer expands
D) Heat is lost to the surroundings during the experiment
  • 13. In calorimetry, cooling correction is usually
A) Added to the observed temperature rise
B) Multiplied by mass
C) Subtracted from the observed temperature rise
D) Subtracted from the observed temperature rise
  • 14. A calorimeter loses heat mainly through
A) Magnetism
B) Reflection
C) Radiation and convection
D) Compression
  • 15. A temperature rise recorded is 15°C. If the cooling correction is +1°C, calculate the percentage correction.
A) 5%
B) 6.7%
C) 10%
D) 15%
  • 16. A temperature rise recorded is 15°C. If the cooling correction is +1°C, calculate the percentage correction.
A) Density
B) Quantity of Heat accurately
C) Volume
D) Pressure
  • 17. During a calorimetry experiment, the observed temperature rise is smaller than the true value because:
A) Water gains mass
B) Temperature becomes constant immediately
C) Heat escapes to the surrounding
D) The calorimeter melts
  • 18. The unit of quantity of heat is
A) Newton
B) Pascal
C) Watt
D) Joule
  • 19. An observed final temperature is 48.2°C and cooling correction is +0.5°C. Find the corrected final temperature.
A) 48.0°C
B) 47.7°C
C) 48.7°C
D) 49.2°C
  • 20. A body cools from 60°C to 50°C in 4 minutes. Room temperature is 20°C. Find average excess temperature.
A) 25°C
B) 30°C
C) 45°C
D) 35°C
  • 21. In the formula, what does the variable T(s) represent?
A) The constant temperature of the surrounding environment (surroundings)
B) The time taken to reach thermal equilibrium
C) The specific heat capacity of the material
D) The starting temperature of the object
  • 22. What does the variable T(t) represent in the equation
A) The time it takes for the temperature to drop to 0 degrees Celsius
B) The total heat energy lost by the system
C) The temperature of the object at any specific time t
D) The melting point of the polymer sample
  • 23. If a polymer melt at 180 degree Celsius is placed in a room at 25 degree Celcius. what is the value of (T(o) - T(s)?
A) 25 degree Celcius
B) 155 degree Celcius
C) 180 degree Celcius
D) 205 degree Celcius
  • 24. If T(s)= 25 degree Celcius, T(o) = 125 degree Celcius, and k= 0.1 per min, what is the temperature after 10 mins? (Take e-1= 0.368)
A) 75.2 degree Celcius
B) 61.8 degree Celcius
C) 36.8 degree Celcius
D) 25.0 degree Celcius
  • 25. What type of mathematical decay does the temperature of a cooling body follow?
A) Quadratic decay
B) Logarithmic growth
C) Linear decay
D) Exponential decay
  • 26. To solve for time t from the cooling formula, which mathematical operation must be used to eliminate the exponential base e?
A) Natural Logarithm ln
B) Square root
C) Integration by parts
D) Common Logarithm
  • 27. If the initial temperature of a rubber sample matches the room temperature T(o) - T(s), What is T(t) after 50 mins?
A) It drops to absolute zero
B) It equals T(s)
C) At zero degrees
D) It doubles its value
  • 28. For a given system,`if e-kt = 0.25 after 5 mins, what will be the value of e-kt after 10 minutes?
A) 0.0625
B) 0.500
C) 0.050
D) 0.125
  • 29. Given that T(t) = 30 + 70e-kt. What was the initial temperature (T (o)) of the substance at t=0?
A) 70 degree Celcius
B) 40 degree Celcius
C) 30 degree Celcius
D) 100 degree Celcius
  • 30. Using the same equation T(t) = 30 + 70 e-0.2t, what is the final temperature the substance reaches after a long time?
A) 0 degree Celcius
B) 70 degree Celcius
C) 30 degree Celcius
D) 100 degree Celcius
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