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  4. A clock which keeps correct time at 25° C has a pendulum made of a metal. The temperature falls to 0° C. If the coefficient of linear expansion of the metal is 1.9 × 10-5 per ° C, then number of second the clock gains per day is :

Q. A clock which keeps correct time at has a pendulum made of a metal. The temperature falls to . If the coefficient of linear expansion of the metal is per , then number of second the clock gains per day is :

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