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If a scale is made up of a material at temp $t_{1}^{0} C$ if temperature is changed to ${t_{2}}^{0} C$ $(t_{2} < t_{1})$ then( coefficient of linear expansion is positive)

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measuring length > actual length

measuring length = actual length

measuring length < actual length

all the above

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Correct option is A

coefficient of linear expansion is positive then , scale shrinks, hence the length shown on scale will be greater than actual length

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If a scale is made up of a material at temp t10C if temperature is changed to t20Ct2<t1 then( coefficient of linear expansion is positive)

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If a scale is made up of a material at temp $t_{1}^{0} C$ if temperature is changed to ${t_{2}}^{0} C$ $(t_{2} < t_{1})$ then( coefficient of linear expansion is positive)