Jamb Physics 2014 Past Questions and Answers

Question 11:

• JAMB 2014

An object of mass 20kg is released from a height of 10m above the ground level. The kinetic energy of the object just before it hits the ground is

A. 200J
B. 4000J
C. 2000J
D. 500J

Question 12:

• JAMB 2014

The energy in the nucleus of atoms produce heat which can be used to generate

A. Kinetic energy
B. Mechanical energy
C. Electrical energy
D. Potential energy

Question 13:

• JAMB 2014

A machine whose efficiency is 75% is used to lift a load of 1000N. Calculate the effort put in to the machine if it has a Velocity ratio of 4.

A. 343.32N
B. 233.33N
C. 333.33N
D. 334.33N

Question 14:

• JAMB 2014

A wheel and an axle is used to raise a load whose weight is 800N when an effort of 250N is applied. If the radii of the wheel and axle are 800mm and 200mm respectively, the efficiency of the machine is

A. 90%
B. 80%
C. 85%
D. 87%

Question 15:

• JAMB 2014

A force of 500N¹ is applied to a steel wire of cross-sectional area 0.2m², The tensile stress is

A. 2.5x10⁴Nm^-2
B. 1.0x10²Nm^-2
C. 1.0x10³Nm^-2
D. 2.5x10³Nm^-2