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CBSE Class 10 Environmental & Disaster Management — practice questions — page 2

Explore 81 free Environmental & Disaster Management questions in CBSE 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 31–60 of 81.

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 →An ecosystem consists of:Read the answer and worked solution →Organisms that produce their own food using sunlight are called:Read the answer and worked solution →Decomposers help in the ecosystem by:Read the answer and worked solution →The 10% law of energy transfer states that:Read the answer and worked solution →In a typical food chain "grass → grasshopper → frog → snake", the frog is at the:Read the answer and worked solution →The flow of energy in an ecosystem is:Read the answer and worked solution →Ozone in the stratosphere is important because:Read the answer and worked solution →Stratospheric ozone is formed by the action of UV radiation on:Read the answer and worked solution →Chlorofluorocarbons (CFCs) damage the ozone layer because they:Read the answer and worked solution →The Montreal Protocol (1987) aimed at:Read the answer and worked solution →A substance broken down by biological processes is:Read the answer and worked solution →Which of the following is non-biodegradable?Read the answer and worked solution →A food web is best described as:Read the answer and worked solution →In any ecosystem, the largest population in numbers usually belongs to the:Read the answer and worked solution →The phenomenon by which non-biodegradable chemicals get progressively concentrated up the food chain is called:Read the answer and worked solution →The ozone "hole" first widely reported in the 1980s was located over:Read the answer and worked solution →A pond ecosystem provides examples of all of the following EXCEPT:Read the answer and worked solution →Why do food chains rarely have more than four or five trophic levels?Read the answer and worked solution →In which form is energy lost as it moves up the trophic levels?Read the answer and worked solution →Which gas is produced in the largest quantity by anaerobic decomposition of organic waste in landfills?Read the answer and worked solution →Ozone (O₃) at ground level is:Read the answer and worked solution →Which is the simplest correct food chain in a grassland ecosystem?Read 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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More Science topics

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