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Physics 2012 JAMB Past Questions

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36
A conductor of length 1m moves with a velocity of 50ms-1 at an angle of 30o to the direction of a uniform magnetic field of flux density 1.5Wbm-2. What is the e.m.f induced in the conductor?
  • A. 37.5V
  • B. 50.5V
  • C. 75.0V
  • D. 80.5V
View Answer & Discuss (7) JAMB 2012
37

The process of detecting a pin mistakenly swallowed by a child is X-ray

  • A. Diagnosis
  • B. Therapy
  • C. Crystallography
  • D. Mammography
View Answer & Discuss (18) JAMB 2012
38

Which of the following CANNOT be deflected by both electric and magnetic fields?

  • A. Gamma rays
  • B. Alpha particles
  • C. Wave particles
  • D. Beta particles
View Answer & Discuss (2) JAMB 2012
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39
A piece of radioactive material contains 1000 atmos. If its half -life is 20seconds, the time taken for 125 atoms to remain is
  • A. 20 seconds
  • B. 40 seconds
  • C. 80 seconds
  • D. 60 seconds
View Answer & Discuss (4) JAMB 2012
40

The p-n junction diodes can act as rectifiers because they

  • A. conduct current when forward-biased
  • B. conduct current when reverse-biased
  • C. block current when forward-biased
  • D. conduct current in both directions
View Answer & Discuss (11) JAMB 2012
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