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1561

A substance has a half of 3mins. after 6mins. the count rate was observed to be 400. What was its count rate at zero time?

  • A. 200
  • B. 1200
  • C. 1600
  • D. 2400
View Answer & Discuss (8) JAMB 1990
1562
The photocell works on the principle of the
  • A. voltaic cell
  • B. emision of electrons by incident radiation
  • C. emision of protons by incident electrons
  • D. photographic plate
View Answer & Discuss (8) JAMB 1990
1563
Which of the following is a set of vectors?
  • A. force, mass and moment
  • B. acceleration, velocity and moment
  • C. mass, weight and density
  • D. mass, volume and density
View Answer & Discuss (5) JAMB 1989
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1564
The magnitude of the resultant of two mutually perpendicular forces, F1 and F2 is 13N, if the magnitude of F1 is 5N, what is the magnitude of F2?
  • A. 2.6N
  • B. 6.0N
  • C. 12.0N
  • D. 18.0N
View Answer & Discuss (5) JAMB 1989
1565
Two points on a velocity time-graph have coordinates (5s, 10ms-1) and (20s, 20ms-1). Calculate the mean acceleration between the two points
  • A. 0.67ms-1
  • B. 0.83ms-1
  • C. 1.50ms-1
  • D. 2.00ms-1
View Answer & Discuss (5) JAMB 1989
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