passwella.
Menu

JAMB Physics 1981 Question 1

Question 1

Temperature and Thermometers

The ice and steam points of a mercury-in-glass thermometer of centigrade scale and of uniform bore correspond respectively to 3 cm and 19 cm lengths of the mercury thread. When the length is 12 cm, the temperature is

  1. A.32°C
  2. B.48°C
  3. C.56°C
  4. D.65°C
  5. E.75°C
Show the answer and explanation

Answer: C (56°C)

Explanation

The 100 degrees span 19 − 3 = 16 cm. At 12 cm the thread is 9 cm above the ice point: θ = (9/16) × 100 ≈ 56°C.