Jamb Physics 2012 Past Questions and Answers

Question 66:

• JAMB 2012

If ∆x is the uncertainty in the measurement of the position of a particle along the x-axis and ∆P_a is the uncertainty in the measurement of the linear momentum along the x-axis, then the uncertainty principle relation is given as

A. ∆x ∆P_x ≥ h
B. ∆x ∆P_x = 0
C. ∆x ∆P_x < h
D. ∆x ∆P_x = ∞

Question 67:

• JAMB 2012

An electric generator with a power output of 3.0KW at a voltage of 1.5KV distributes power along cables of resistance 20.0Ω. The power loss in the cables is

A. 80.0W
B. 40.0W
C. 10.0W
D. 0.1W

Question 68:

• JAMB 2012

If the frequency of an emitted x-ray is 1.6 x 10¹⁶Hz, the accelerating potential is?
[e = 1.6 x 10^-19C, h = 6.63 x 10^-34Js]

A. 6630.0V
B. 663.0V
C. 66.3V
D. 6.6V

Question 69:

• JAMB 2012

If the fraction of the atoms of a radioactive material left after 120years is 1/64, what is the half-life of the material?

A. 24 years
B. 20 years
C. 10 years
D. 2 years

Question 70:

• JAMB 2012

A certain radioactive source emits radiations that were found to be deflected by both magnetic and electric fields. The radiations are

A. Beta rays
B. Gamma rays
C. X-rays
D. Unltr-violet rays