Jamb Physics 1990 Past Questions and Answers

Question 11:

• JAMB 1990

40m³ of liquid is mixed with 60m³ of another liquid Q. If the density of P and Q are 1.00kgm^-3 and 1.6kgm^-3 respectively, what is the density of the mixture?

A. 0.05kgm^-3
B. 1.25kgm^-3
C. 1.30kgm^-3
D. 1.36kgm^-3

Question 12:

• JAMB 1990

The resistances of platinum wire at the ice and steam points are 0.75 ohm and 1.05 ohm respectively. Determine the temperature at which the resistance of the wire is 0.90 ohm

A. 43.0^oC
B. 50.0^oC
C. 69.9^oC
D. 87.0^oC

Question 13:

• JAMB 1990

A bar of initial length /₀ is heated through a temperature change \(\Delta\)t to a new length I. The linear expansivity, a, of the bar is

A. \(\frac{/ - /_o}{/ \Delta t}\)
B. \(\frac{/ - /_o}{/_o \Delta t}\)
C. /_o(1 + \(\Delta\) t)
D. \(\frac{/ - /_o}{/(1 + \Delta t)}\)

Question 14:

• JAMB 1990

The pressure of a gas when cooled at constant volume will decrease because the molecules

A. Collide less frequently with the walls of the container
B. Have the same average kinetic energy
C. Break up into smaller molecules
D. Decrease in number

Question 15:

• JAMB 1990

1kg of copper is transferred quickly from boiling water to a block of ice. Calculate the mass of ice melted, neglecting heat loss. [specific heat capacity of copper 400Jkg^-1K^-1 and latent heat of fusion of ice 333 x 10³Jkg^-1]

A. 60g
B. 67g
C. 120g
D. 133g