Jamb Physics 2001 Past Questions and Answers

Question 36:

• JAMB 2001

Energy losses through eddy currents are reduced by using

A. Low resistance wires
B. Insulated soft iron wires
C. Few turns of wires
D. High resistance wires

Question 37:

• JAMB 2001

A capacitor of 20 x 10^-12F and an inductor are joined in series. The value of the inductance that will give the circuit a resonance frequency of 200kHz is

A. I/16 H
B. I/8 H
C. I/64 H
D. I/32 H

Question 38:

• JAMB 2001

The magnetic force on a charged particle moving with velocity v is

A. Proportional to both the magnitude of the charge and the velocity v
B. Independent of the magnitude of the charge
C. Proportional to the velocity v only
D. Proportional to the magnitude of the charge only

Question 39:

• JAMB 2001

In the diagram above, which of the simple pendula will resonate with P when set into oscillation

A. T
B. U
C. R and T
D. Q and R

Question 40:

• JAMB 2001

The diagram above is a block and tackle pulley system in which an effort of 80N is use to lift a load of 240N. The efficiency of the machine is

A. 60%
B. 50%
C. 40%
D. 33%