Jamb Physics 2007 Past Questions and Answers

Question 36:

• JAMB 2007

The instantaneous value of the induced e.m.f as a function of time is ε = ε_o sin ωt where ε_o is the peak value of the e.m.f. The instantaneous value of the e.m.f., one quarter of the period is

A. 0.00
B. ^ε_o/₄
C. ^ε_o/₂
D. ε_o

Question 37:

• JAMB 2007

During the nuclear reaction described by W → X→ Y

235	235	231
92	93	91

the particles emitted are respectively

A. α and α
B. α and β
C. β and β
D. β and α

Question 38:

• JAMB 2007

from the diagram above, the inductive reactance and the resistance R are respectively

A. 50Ω and 45Ω
B. 25Ω and 51Ω
C. 20Ω and 50Ω
D. 10Ω and 50Ω

Question 39:

• JAMB 2007

118.8cm² surface of the copper cathode of a voltameter is to be coated with 10^-6m thick copper of density 9 x 10³kgm^-3. How long will the process run with 10A constant current?
[3.3 x 10^-7kgC^-1]

A. 5.4 min
B. 10.8 min
C. 15.0 min
D. 20.0 min

Question 40:

• JAMB 2007

A particle of weight 120N is placed on a plane inclined at 30⁰ to the horizontal. If the plane has an efficiency of 60% to the floor what is the force required to push the weight uniformly up the plane?

A. 50N
B. 100N
C. 175N
D. 210N