Question

Q.A pendulum clock loses 12 s a day if the temperature is 40 °C and gains 4 s 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:​

A) 60°C; α = 1.85 × 10–4/°C

B) 30°C; α = 1.85 × 10–3/°C

C) 55°C; α = 1.85 × 10–2/°C

D) 25°C; α = 1.85 × 10–5/°C

Answer 1

ans -- (D)

hope, it's the right answer.