What kind of ferromagnetic material is used for coating magnetic tapes in a cassette player, or for building 'memory stores' in modern computer ?

What type of magnetic material is used in making permanent magnets ?

Paragraph based Questions : Read the paragraph and answer the, questions given below: Sulphuric acid is present in the acid rain and materials coming out of mines . You know that erosion of metals present in statues, bridges and buildings occurs due to it. Sulphuric acid is a source of energy for some species of bacteria like Acidophilum spp. and Acidobacillus ferrooxidans Hence. these bacteria can control the soil pollution occurring due to acid rain water soluble salts of uranium are present in the wastes produced during electroplating and in effluent released in the environment from the atomic energy Plant. Geobacter convert these salts of uranium into insoluble salts and thereby prevent those salts from mixing with groundwater sources. What kind of pollution do these bacteria control?

Questions based on paragraph The important parts of computer include the Input unit, the Central Processing Unit (CPU) or the processor and the Output unit. The Input unit is used to enter information or data into the computer. Some of the devices used for input include the keyboard and the scanner. On the other hand, the Output device is used for Providing the result / solution / answer to the user. Generally a monitor or printer is used as an output unit. The Processing unit consists of a memory unit, control unit and ALU i.e. arithmetic logic unit. The Processing unit receives the input in form of instructions, executes each instruction in a specific order and provides the output to the user. What are the important parts of a computer?

Questions based on paragraph The important parts of computer include the Input unit, the Central Processing Unit (CPU) or the processor and the Output unit. The Input unit is used to enter information or data into the computer. Some of the devices used for input include the keyboard and the scanner. On the other hand, the Output device is used for Providing the result / solution / answer to the user. Generally a monitor or printer is used as an output unit. The Processing unit consists of a memory unit, control unit and ALU i.e. arithmetic logic unit. The Processing unit receives the input in form of instructions, executes each instruction in a specific order and provides the output to the user. What is the main function of the Processing unit? What are its important parts?

Questions based on paragraph The important parts of computer include the Input unit, the Central Processing Unit (CPU) or the processor and the Output unit. The Input unit is used to enter information or data into the computer. Some of the devices used for input include the keyboard and the scanner. On the other hand, the Output device is used for Providing the result / solution / answer to the user. Generally a monitor or printer is used as an output unit. The Processing unit consists of a memory unit, control unit and ALU i.e. arithmetic logic unit. The Processing unit receives the input in form of instructions, executes each instruction in a specific order and provides the output to the user. What is the main function of the output unit?

Questions based on paragraph The important parts of computer include the Input unit, the Central Processing Unit (CPU) or the processor and the Output unit. The Input unit is used to enter information or data into the computer. Some of the devices used for input include the keyboard and the scanner. On the other hand, the Output device is used for Providing the result / solution / answer to the user. Generally a monitor or printer is used as an output unit. The Processing unit consists of a memory unit, control unit and ALU i.e. arithmetic logic unit. The Processing unit receives the input in form of instructions, executes each instruction in a specific order and provides the output to the user. What is the main function of the input unit?

Read the following paragraph and answer the questions given below it: The resistance of a metal falls when cooled below room temperature. Many scientists believed that the value of the resistance would become constant at some very low temperature, allowing the current to flow with little or no resistance. H. K. Onnes successfully liquefied helium in 1908 by cooling it to about 4 K. In 1911, while investigating the electrical property of very pure mercury. Onnes discovered that at a temperature of 4.2 kelvin, its resistance practically vanished. This new state, on account of its extraordinary property, is now called the superconducting state and the phenomenon is called superconductivity. A superconductor, below a certain critical temperature, offers almost zero resistance to a flow of current through it. Onnes also discovered that a superconductor exhibits persistent current: once set up, the current continues to flow for a very long time without an electric potential difference driving it and without significant loss. Superconductivity is used in many diverse areas, such as magnetically levitated trains, transmission of electricity, increasing speed of computers, in MRI (magnetic resonance imaging). At what temperature does the resistance of very pure mercury become almost zero?

Read the following paragraph and answer the questions given below it: The resistance of a metal falls when cooled below room temperature. Many scientists believed that the value of the resistance would become constant at some very low temperature, allowing the current to flow with little or no resistance. H. K. Onnes successfully liquefied helium in 1908 by cooling it to about 4 K. In 1911, while investigating the electrical property of very pure mercury. Onnes discovered that at a temperature of 4.2 kelvin, its resistance practically vanished. This new state, on account of its extraordinary property, is now called the superconducting state and the phenomenon is called superconductivity. A superconductor, below a certain critical temperature, offers almost zero resistance to a flow of current through it. Onnes also discovered that a superconductor exhibits persistent current: once set up, the current continues to flow for a very long time without an electric potential difference driving it and without significant loss. Superconductivity is used in many diverse areas, such as magnetically levitated trains, transmission of electricity, increasing speed of computers, in MRI (magnetic resonance imaging). What is a superconductor?

Read the following paragraph and answer the questions given below it: The resistance of a metal falls when cooled below room temperature. Many scientists believed that the value of the resistance would become constant at some very low temperature, allowing the current to flow with little or no resistance. H. K. Onnes successfully liquefied helium in 1908 by cooling it to about 4 K. In 1911, while investigating the electrical property of very pure mercury. Onnes discovered that at a temperature of 4.2 kelvin, its resistance practically vanished. This new state, on account of its extraordinary property, is now called the superconducting state and the phenomenon is called superconductivity. A superconductor, below a certain critical temperature, offers almost zero resistance to a flow of current through it. Onnes also discovered that a superconductor exhibits persistent current: once set up, the current continues to flow for a very long time without an electric potential difference driving it and without significant loss. Superconductivity is used in many diverse areas, such as magnetically levitated trains, transmission of electricity, increasing speed of computers, in MRI (magnetic resonance imaging). What is special about a superconductor?

Read the given passage and answer the following questions: The home electrical connection consists of 'live','neutral' and 'earth wires. The 'live' and the 'neutral' wires have potential difference of 220 v. The earth ire is connected to ground. Due to a fault in the equipment or if the plastic coating on the 'live ' and the neutral wires gives away the two wires come in contact with each other and a large current flows through it producing heat . If any inflammable material (such as wood , cloth , plastic etc). exists around that place it can catch fire. Therefore a fuse wire is used as a precautionary measures. What is short circuit?