Jamb Physics 1998 Past Questions and Answers

Question 21:

• JAMB 1998

How many grams of water at 17^oC must be added to 42g of ice at 0^oC to melt the ice completely? [specific latent heat of fusion of ice = 3.4 x 10⁵Jkg^-1, specific heat capacity of water = 4200Jkg^-1k^-1]

A. 200g
B. 300g
C. 320g
D. 400g

Question 22:

• JAMB 1998

A vapour is said to be saturated when

A. More molecules return to the liquid than the amount that left it
B. A dynamic equilibrium exists between the molecules of the liquid and the vapour molecules at a given temperature
C. The vapour pressure is equal to the atmospheric pressure
D. All molecules are moving with the same speed in all directions at a given temperature

Question 23:

• JAMB 1998

One valid assumption of the kinetic theory of gasses is the

A. The molecules of a gas are constantly in a state of motion and the number of collision remains constant
B. The number of molecule of gas increases with increasing pressure
C. As the temperature increases, the number of collision made by the gas molecule remains constant
D. The molecules of gas are all identical and are very small in size

Question 24:

• JAMB 1998

The physical properties of sound waves can best be described by

A. Reflection and diffraction
B. Polarization and reflection
C. Polarization and diffraction
D. Polarization and refraction

Question 25:

• JAMB 1998

In a closed organ pipe producing a musical note, an antinode will always be produced at

A. The closed end
B. The open end
C. The middle
D. All the parts of the pipe