Doubtly
@Doubtly · Joined Feb 2021
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- Draw magnetic field lines around a bar magnet. Magnetic field lines of a bar magnet emerge from the north pole and terminate at the south pole. Inside the magnet, the field lines emerge f... 1
- Why does a compass needle get deflected when brought near a bar magnet? The needle of a compass is a small magnet. That’s why when a compass needle is brought near a bar magnet, its magnetic field lines interact... 1
- What are the environmental consequences of the increasing demand for energy? What steps would Industrialization increases the demand for energy. Fossil fuels are easily accessible sources of energy that fulfil this demand. The increas... 1
- What are the advantages and disadvantages of using a solar cooker? Are there places where solar cookers Solar cooker uses Sun's energy to heat and cook food. It is inexhaustible and clean renewable source of energy. It is free for all and avail... 1
- What are the qualities of an ideal source of energy? An ideal source of energy must be: Economical Easily accessible Smoke/pollution free Easy to store and transport Able to produce huge amount... 1
- On what basis would you classify energy sources as (a) renewable and non-renewable? (b) exhaustible and inexhaustible? (a) The source of energy that replenishes in nature is known as renewable source of energy. Sun, wind, moving water, bio-mass, etc. are some... 1
- What are the limitations of extracting energy from - (a) the wind? (b) waves? (c) tides? (a) A windmill requires wind of speed more than 15 km/h to generate electricity from wind energy also large numbers of windmills are require... 1
- Compare and contrast bio-mass and hydro electricity as sources of energy. Bio-mass and hydro-electricity both are renewable sources of energy. Bio-mass is derived from dead plants and animal wastes. Hence, it is na... 1
- Compare and contrast fossil fuels and the Sun as direct sources of energy. Fossil fuels are energy sources, such as coal and petroleum, obtained from underneath the Earth's crust. They are directly available to huma... 1
- Most of the sources of energy we use represent stored solar energy. Which of the following is not Correct option is c) Nuclear energy 2
- Which of the following is not an example of a bio-mass energy source? (a) wood (b) gobar gas (c) nuclear energy (d) coal Correct option is c) nuclear energy 2
- A solar water heater cannot be used to get hot water on (a) a sunny day (b) a cloudy day Correct option is b) a cloudy day 2
- Give the names of two energy sources that you would consider to be exhaustible. Give reasons for your choices. Two exhaustible energy sources are as follows: Coal: It is produced from dead remains of plants and animals that remain buried under the ear... 1
- Name two energy sources that you would consider to be renewable. Give reasons for your choices. Two renewable sources of energy are : Sun: The energy derived from the Sun is known as solar energy. Solar energy is produced by the fusion... 1
- Hydrogen has been used as a rocket fuel. Would you consider it a cleaner fuel than CNG? Why or why not? Hydrogen gas is cleaner than CNG. CNG contains hydrocarbons. Therefore, it has carbon contents. Carbon is a form of pollutant present in CNG... 2
- Can any source of energy be pollution-free? Why or why not? No source of energy can be pollution-free. Every source of energy has some type of pollution. For example, the wastes of nuclear reaction ar... 1
- What are the advantages of nuclear energy? The advantages of nuclear energy are: Large amount of energy is produced per unit mass. It does not produce smoke. It is a clean energy. Fis... 1
- What is geothermal energy? Geothermal power plants use heat of the Earth to generate electricity. This heat energy of the Earth is known as geothermal energy. 1