Jamb Physics 1985 Past Questions and Answers

Question 11:

• JAMB 1985

A 0.05kg bullet travelling at 500ms^-1 horizontally strikes a thick vertical wall. It stops after penetrating through the wall horizontal distance of 0.25m. What is the magnitude of the average force the wall exerts on the bullet?

A. 25N
B. 50N
C. 250N
D. 500N
E. 25 000N

Question 12:

• JAMB 1985

A force of 100N stretches an elastic string to a total length of 20cm. If an additional force of 100N stretches the string 5cm further, Find the natural length of the string

A. 15cm
B. 12cm
C. 10cm
D. 8cm
E. 5cm

Question 13:

• JAMB 1985

Two divers G and H are at depths 20m and 40m respectively below the water surface in a lake. The pressure on G is P₁ while the pressure on H is P₂. If the atmospheric pressure is equivalent to 10m of water, then the value of \( \frac{p_2}{p_1} \) is

A. 0.50
B. 0.60
C. 1.67
D. 2.00
E. 3.0

Question 14:

• JAMB 1985

The areas of the effort and load pistons of a hydraulic press are 0.5m² and 5m² respectively. If a force F₁ of 100N is applied on the effort piston, the force F₂ on the load is

A. 10N
B. 100N
C. 500N
D. 1000N
E. 5000N

Question 15:

• JAMB 1985

A metal cube of volume 10³mm³ is lowered into a measuring cylinder containing water. If the internal cross-sectional area of the cylinder is 1.5 x 10²mm², by how much does the water level rise in the cylinder?

A. 6.67 x 10⁰mm
B. 8.50 x 10²mm
C. 1.15 x 10³mm
D. 2.50 x 10³mm
E. 1.50 x 10⁵mm