Jamb Physics 1999 Past Questions and Answers

Question 11:

• JAMB 1999

When temperature of a liquid increases, its surface tension

A. Decreases
B. Increases
C. Remain Constant
D. Increases then decreases

Question 12:

• JAMB 1999

A gas at a volume of V₀ in a container at pressure P₀ is compressed to one-fifth of its volume. What will be its pressure if the magnitude of its original temperature T is constant?

A. P₀/5
B. 4P₀/5
C. P₀
D. 5P₀

Question 13:

• JAMB 1999

A piece of substance of specific head capacity 450JKg^-1K^-1 falls through a vertical distance of 20m from rest. Calculate the rise in temperature of the substance on hitting the ground when all its energies are converted into heat. [g = 10ms^-2]

A. 2/9°C
B. 4/9°C
C. 9/4°C
D. 9/2°C

Question 14:

• JAMB 1999

I. A liquid boils when its saturated vapour pressure is equal to the external pressure
II. Dissolved substances in pure water lead to increase in the boiling point.
III. When the external pressure is increased, the boiling point increases.
IV. Dissolved substances in pure water decrease the boiling point.
Which combination of the above are peculiarities of the boiling point of a liquid?

A. I, II and III
B. I, II, III and IV
C. I, II and IV
D. II, III and IV

Question 15:

• JAMB 1999

The temperature gradient across a copper rod of thickness 0.02m, maintained at two temperature junctions of 20°C and 80°C respectively is

A. 3.0 x 10²Km^-1
B. 3.0 x 10³Km^-1
C. 5.0 x 10³Km^-1
D. 3.0 x 10⁴Km^-1