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JEE Main 2016 Physics question

PhysicsThermal Properties of MatterJEE Main 2016

A pendulum clock loses 12 s a day if the temperature is 40°C and gains 4s a day if the temperature is 20°C. The temperature at which the clock will show correct time, and the co-efficient of linear expansion (α) of the metal of the pendulum shaft are respectively :

Answer: (A)

Solution

Time lost per day = . So 12 = and 4 =

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Question ID VK-008854