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A coil of an alloy _______ is used in electric heater cooker as a resistor.
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Which of the following substance contracts on heating?
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_______ heat is necessary to raise 1 kg of water from 14.5 °C to 15.5 °C.
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In Wilfley table method to separate particles of gangue _______ method is used.
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The chemical formula of zinc blend is _______.
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The unsaturated hydrocarbons containing a carbon-carbon double bond are called _______.
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The phenomenon in which compounds having different structural formulae have the same molecular formula is called _______.
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While going in an increasing order there is a rise in the molecular mass of the consecutive members of the homologous series by _______.
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The general molecular formula for the homologous series of alkynes is _______.
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Cyclohexane : Cyclic hydrocarbon : : Isobutylene : _______
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Saturated hydrocarbon : Single bond : : Unsaturated hydrocarbon : _______
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Find the odd one out and give its explanation.
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Find the odd one out and give its explanation.
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What is the heating effect of electric current?
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Which metal is used to make the filament of an electric bulb?
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What is a short circuit?
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What is used to turn off the sudden increase in current in the electrical circuit of the house nowadays?
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Write two devices based on the heating effect of electric current.
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Match the columns.
| Group A | Group B |
| 1. ZnS | a) Copper Sulphide |
| 2. HgS | b) Bauxite |
| c) Cinnabar | |
| d) Zinc blend |
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