A pendulum clock loses 12s 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 ( alpha) of the metal of the pendulum shaft are respectively:

A pendulum clock loses 12s a day if the temperature is 40°C and gains

1.	A pendulum clock loses 12s 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 ( alpha) of the metal of the pendulum shaft are respectively:
Answer» `55^(@) C, alpha = 1.85 xx 10^(-2) //""^(@) C` `25^(@) C , alpha= 1.85 xx 10^(-5)//""^(@) C` `60^(@) C, alpha = 1.85 xx 10^(-4)//""^(@) C` `30^(@) C, alpha = 1.85xx 10^(-3) //""^(@) C` Answer :B