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State the atomic number and mass number of \[\ce{^23_11Na}\] and draw its atomic model.
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Explain, why the potential difference across the terminals of a cell is more when the cell is not in use than it is when the cell is being used.
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How is direction of current related to the direction of flow of electrons?
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State expression for Cells connected in series.
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What is meant by internal resistance of a cell?
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State the condition when it is advantageous to connect cells in series.
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State the condition when it is advantageous to connect cells in parallel.
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How should the electric lamps in a building be connected?
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What determines the direction of flow of electrons between two charged conductors kept in contact?
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Which part of an electrical appliance is earthed?
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State the conditions for the flow of charge in a circuit from one point to the other.
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An electrical gadget can give an electric shock to its user under certain circumstances. Mention any two of these circumstances.
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An electrical appliance is rated at 1000 KVA, 220V. If the appliance is operated for 2 hours, calculate the energy consumed by the appliance in: (i) kWh (ii) joule.
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Three resistances, of which two are equal when connected in series have an effective resistance of 30 ohms. When the three resistances are connected in parallel, the effective resistances is 3 ohms. Find the values of the individual resistances.
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An electric bulb is marked 100 W, 250 V. How much current will the bulb draw if connected to a 250 V supply?
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State whether a magnetic field is associated or not around a current carrying conductor.
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Which colour of white light is deviated most.
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Which colour of white light is deviated at least?
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Write approximate wavelength for (i) blue (ii) red light. Which colour has the higher speed in a vacuum? Which colour has the higher speed in the glass?
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State and explain ‘Ampere’s Swimming Rule’ to determine the direction of magnetic field (or magnetic lines of force) around a current carrying conductor.
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