A Foreman of an automobile workshop wants to measure the temperature inside the piston of a car, whose temperature will be of the order of 700?C (accurate upto 1?C). The best thermometer to use is

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Thermo electric thermometer

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Constant volume hydrogen thermometer

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Platinum resistance thermometer

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Optical pyrometer

Q. A Foreman of an automobile workshop wants to measure the temperature inside the piston of a car, whose temperature will be of the order of 700?C (accurate upto 1?C). The best thermometer to use is

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