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Karnataka SSLC (Class 10) Environmental & Disaster Management — practice questions — page 2

Explore 53 free Environmental & Disaster Management questions in Karnataka SSLC (Class 10) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Environmental & Disaster Management questions and exercises with answers

Showing questions 31–53 of 53.

A typical single solar cell produces about how much voltage?Read the answer and worked solution →Thermal power plants typically convert what percentage of the chemical energy of coal into electricity?Read the answer and worked solution →Why is the use of solar energy not yet widespread despite zero fuel cost?Read the answer and worked solution →Compared with a fossil-fuel plant of the same output, a hydroelectric plant has:Read the answer and worked solution →Which is the ultimate source of energy in the wind?Read the answer and worked solution →The biogas plant produces a fuel that can be:Read the answer and worked solution →Wind farms require all of the following EXCEPT:Read the answer and worked solution →Tap the item that does not belongRead the answer and worked solution →All the interacting organisms in an area together with the non-living components of the environment form a(n)Read the answer and worked solution →In an ecosystem, green plants are classified asRead the answer and worked solution →Bacteria and fungi that break down the dead remains of organisms are calledRead the answer and worked solution →A series of organisms feeding on one another forms aRead the answer and worked solution →In a food chain, the green plants (producers) occupy theRead the answer and worked solution →On average, the percentage of energy that is transferred from one trophic level to the next is aboutRead the answer and worked solution →The flow of energy in a food chain isRead the answer and worked solution →Food chains generally have only three or four steps becauseRead the answer and worked solution →The progressive increase in the concentration of harmful, non-degradable chemicals at each higher trophic level is calledRead the answer and worked solution →The ozone layer in the upper atmosphere is important because itRead the answer and worked solution →The chemicals mainly responsible for the depletion of the ozone layer areRead the answer and worked solution →Substances that are broken down by biological processes are said to beRead the answer and worked solution →Which one of the following is a non-biodegradable waste?Read the answer and worked solution →The maximum concentration of accumulated pesticides in a food chain is usually found inRead the answer and worked solution →Rule on these claims about a food chainRead the answer and worked solution →

Worked practice questions

A typical single solar cell produces about how much voltage?

  1. 0.5 to 1 volt
  2. 5 to 10 volts
  3. 50 volts
  4. 220 volts
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Correct answer: A. 0.5 to 1 volt

1. A silicon solar cell's open-circuit voltage depends on the band gap. 2. For commercial silicon cells this is about 0.5 to 1 volt. 3. To get higher voltages, many cells are wired in series to form a panel. 4. So a single cell gives only 0.5 to 1 V. 5. Current depends on cell area and incident sunlight. _Source: syllabus Science Ch 14 'Sources of Energy' (byjus.com extract)_

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Thermal power plants typically convert what percentage of the chemical energy of coal into electricity?

  1. Less than 10 percent
  2. About 30 to 40 percent
  3. About 90 percent
  4. 100 percent
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Correct answer: B. About 30 to 40 percent

1. Burning coal heats water to produce steam. 2. The steam drives a turbine connected to a generator. 3. Conversion is limited by the thermodynamic Carnot efficiency. 4. In practice modern plants convert about 30 to 40 percent of the chemical energy. 5. The rest is lost as waste heat to the cooling water and stack gases. _Source: syllabus Science Ch 14 'Sources of Energy' (byjus.com extract)_

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Why is the use of solar energy not yet widespread despite zero fuel cost?

  1. Solar energy is available only in summer
  2. Solar panels work only at night
  3. Initial cost of solar panels is high
  4. Solar energy is poisonous
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Correct answer: C. Initial cost of solar panels is high

1. Solar panels require high-purity silicon and metal interconnects. 2. Manufacturing and installation costs are still significant per kilowatt. 3. Sunlight is free, but the equipment is not. 4. So the high upfront cost limits widespread adoption. 5. Prices have fallen sharply but remain a barrier for many users. _Source: syllabus Science Ch 14 'Sources of Energy' (byjus.com extract)_

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