JAMB and WAEC Physics questions: Change of state

23 questions with answers and explanations. Tap an option to check yourself.

1. Question 21· Change of state· JAMB

   How much heat changes 0.1 kg of water at 100 °C into steam? [specific latent heat of vaporisation = 2.26 × 10⁶ J/kg]

   • A2.26 × 10⁷ J
   • B2.26 × 10⁵ J
   • C2.26 × 10⁴ J
   • D4.2 × 10⁴ J

   Show answer

   Explanation and discussion

2. Question 22· Change of state· JAMB

   How much heat is needed to change 0.1 kg of water at 100 °C into steam at 100 °C? (Latent heat of vaporisation = 2.26 × 10⁶ J/kg)

   • A2.26 × 10⁶ J
   • B2.26 × 10⁵ J
   • C2.26 × 10⁴ J
   • D4.2 × 10⁴ J

   Show answer

   Explanation and discussion

3. Question 23· Change of state· JAMB

   At the top of a high mountain, water boils at a temperature

   • Ahigher than 100 °C
   • Blower than 100 °C
   • Cof exactly 100 °C
   • Dof 0 °C

   Show answer

   Explanation and discussion