All In One Science

Book: All In One Science

Chapter: 14. Source of Energy

Subject: Physics - Class 10th

Q. No. 2 of Challengers

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2

100 W/m2 of solar energy is received by the Earth. If all the energy was to be absorbed by a bucket of water (mass 30 kg) in 30 minutes, then the rise in temperature of water will be

Given:


Power = 100 W/m2


Mass of water = 30 kg


Time = 30 minutes


Specific Heat of Water = 4200 J/kg °C


Solution:


Heat Generated = Mass × Specific Heat × Temperature Rise.


Heat Generated = Power × time


Mass × Specific Heat × Temperature Rise = Power × time




Temperature Rise = 1.43 °C


So correct answer is C.

Chapter Exercises

Check Point 01
Check Point 02
Check Point 03
Check Point 04
Check Point 05
Chapter Exercise
Challengers

More Exercise Questions

1

When the material P mined from the earth is heated strongly in an insufficient supply of air, it produces a solid fuel Q which mainly consist of carbon. When another material R obtained from trees is heated in an insufficient supply of air, it produces another solid fuel S which also consists mainly of carbon. Then, which of the following is true?
2

100 W/m2 of solar energy is received by the Earth. If all the energy was to be absorbed by a bucket of water (mass 30 kg) in 30 minutes, then the rise in temperature of water will be
3

While filling LPG in cylinders, a substance X is added to make the detection of leakage of LPG from the cylinder easy. The substance X is
4

For a nuclear reactor, 48 kJ of energy is produced per minute. If the energy released per fission is 3.2 × 10-11 J, then the number of fission which would be taking place in a reactor per second is
5

The mass number of four different elements A, B, C and D are 2, 35, 135 and 239, respectively. Which of them would provide the most suitable the most suitable for nuclear fission?

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