Jamb Physics 2009 Past Questions and Answers

Question 16:

• JAMB 2009

A heating coil rated 1000 W is used to boil off completely 2 kg of boiling water. the time required to boil of the water is_______
[Special latent heat of Vaporization of water = 2.3 x 10⁶ Jkg^-1]

A. 1.15 x 10⁴s
B. 1.15 x 10³s
C. 4.6 x 10⁴s
D. 4.6 x 10³s

Question 17:

• JAMB 2009

It is observed that water will wet a clean glass because the

A. Cohesion of water to glass is stronger than the cohesion of water molecules
B. Adhesion of water molecules is weaker than the cohesion of water to glass
C. Cohesion of water to glass is weaker than the cohesion of water molecules
D. Adhesion of water molecules is stronger than the cohesion of water molecules

Question 18:

• JAMB 2009

A man standing 2 m from a charcoal fire is warmed mainly by

A. Convection
B. Radiation
C. Refraction
D. Conduction

Question 19:

• JAMB 2009

Metal cables are used as telephone wires because

A. They are cheap
B. They are sourced locally
C. The speed of sound in them is very low
D. The speed of sound in them is very high

Question 20:

• JAMB 2009

Musical instruments playing the same note can be distinguished from one another owing to the differences in their

A. Quality
B. Pitch
C. Intensity
D. Loudness