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Heat is supplied uniformly at the rate of 100W to 1.0 x 10\(^{-2}\)kg of a...

Physics
JAMB 2020

Heat is supplied uniformly at the rate of 100W to 1.0 x 10\(^{-2}\)kg of a liquid for 20 seconds. If the temperature of the liquid rises by 5\(^o\)C, then the specific heat capacity of the liquid is 

  • A. 2.0 x 10\(^2\)Jkg\(^-1\)K\(^-1\)
  • B. 2.0 x 10\(^2\)Jkg\(^-1\)
  • C. 4.0 x 10\(^4\)Jkg\(^-1\)K\(^-1\)
  • D. 4.0 x 10\(^4\)Jkg\(^-1\)
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Correct Answer: Option C
Explanation

Heat energy = Electrical Energy 

MC\(\theta\) = power x time 

5 x 1 x 10\(^{-2}\) x C = 100 x 20 

C = \(\frac{200}{5 \times 10^2}\) 

= 4 x 10\(^4\) J/kg/\(^oC\) 

There is an explanation video available below.

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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
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Explanation Video

WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995