10th
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- Give scientific classification of shark up to class. The classification of shark is as follows: Kingdom- Animalia Phylum- Chordata Sub- phylum- Vertebrata Class- Chondrichthyes 1
- What is the exact difference between grades of organization and symmetry? Explain with examples. Grades of organization: We know that all organisms are made up of cells out of which some organisms may be unicellular while some may be mul... 1
- Write in brief about progressive changes in animal classification. There are various scientists which have contributed to biological classification and based on their observations we have the current system... 1
- Write the characters of each of the following animals with the help of classification chart. Organism Level of organisation Symmetry Coelom Notochord Bath sponge Cellular level Asymmetrical Absent Absent Grasshopper Organ system Bila... 1
- Identify me. a. I am diploblastic & acoelomate. Which phylum do I belong to a. I belong to the phylum Cnidaria. b. I belong to the phylum Echinodermata and my name is Star fish/Asterias. c. You belong to the phylum A... 1
- Write short note on Electrical energy generation and environment. Generating electricity has effects on the environment that depend on the source used; fossil-fuel plants pollute the most, while renewable s... 1
- One solar panel produces a potential difference of 18 V and current of 3A. Connect 4 panels in series to get 72 V, and connect 3 such series strings in parallel to get 9 A. In total 12 panels are needed. Getting 72... 1
- Draw neat and labelled diagrams. a. Energy transformation in solar thermal electric energy generation. Energy transformation in solar thermal electric generation: solar energy → heat energy → kinetic energy of steam → mechanical energy of turb... 1
- Give your opinion about whether hydroelectric plants are environment friendly or not? Hydroelectric plants are largely environment friendly in operation, because they produce no air pollution, but large dams do have some harmf... 1
- Draw a schematic diagram of solar thermal electric energy generation. A solar thermal power plant is drawn as a flow from the sun to the generator: Sun → reflectors → receiver/boiler → steam → turbine → generat... 1
- It is possible to produce energy from mW to MW using solar photovoltaic cells. It is possible because solar photovoltaic cells can be connected in any number, in series and parallel, so the output can be made as small o... 1
- Hydroelectric energy, solar energy and wind energy are called renewable energies Hydroelectric, solar and wind energy are called renewable because their sources are replenished naturally and will not run out however much... 1
- It is absolutely necessary to control the fission reaction in nuclear power plants. The fission reaction must be controlled because an uncontrolled chain reaction releases enormous energy in a very short time, which can caus... 1
- The construction of turbine is different for different types of power plants. The construction of the turbine differs because the substance that turns it and its pressure and speed are different in different power plan... 1
- Explain with diagram step-by-step energy conversion in d. Hydroelectric power plant In a hydroelectric power plant: potential energy of stored water → kinetic energy of flowing water → mechanical energy of turbine → electric... 1
- Explain with diagram step-by-step energy conversion in c. Solar thermal power plant In a solar thermal power plant: solar energy → heat energy → kinetic energy of steam → mechanical energy of turbine → electrical energy. Ste... 1
- Explain with diagram step-by-step energy conversion in b. Nuclear Power Plant In a nuclear power plant: nuclear energy → heat energy → kinetic energy of steam → mechanical energy of turbine → electrical energy. Steps:... 1
- Explain with diagram step-by-step energy conversion in a. Thermal power plant In a thermal power plant: chemical energy of coal → heat energy → kinetic energy of steam → mechanical energy of turbine → electrical energy... 1
- What are the advantages and limitations of solar energy? Solar energy is free, renewable and pollution-free, but it is available only in daytime, depends on the weather and needs costly equipment a... 1
- How can we get the required amount of energy by connecting solar panels? By connecting solar panels in series (to increase voltage) and in parallel (to increase current), we can make a solar array that gives the r... 1
- Saving energy is the need of the hour. Saving energy is the need of the hour because the demand for energy is rising fast while fossil fuel reserves are limited and their use poll... 1
- Energy obtained from fossil fuels is not green energy Energy from fossil fuels is not green energy because burning them pollutes the environment and the fuels are non-renewable. Burning coal, pe... 1
- What is meant by green energy? Which energy sources can be called as green energy sources and why? Give example. Green energy is energy obtained from sources that do not harm the environment, that is, sources which produce no (or very little) pollution... 1
- Explain the difference Thermal electricity generation and solar thermal electricity generation Both use heat to make steam that turns a turbine; the difference is the source of the heat. Thermal electricity generationSolar thermal elec... 1