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Physics 1984 JAMB Past Questions

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26
Which of the following statements about the compound microscope and astronomical telescope is (are) correct? i. the final image of a compound microscope is located at infinity ii. the final image of the astronomical telescope is always erect iii. the objective lens of a compound microscope has a very short focal length
  • A. i only
  • B. ii only
  • C. iii only
  • D. i and iii
  • E. ii and iii
View Answer & Discuss (6) JAMB 1984
27

A coin is placed at the bottom of a cube of glass t cm thick. If the refractive index of the glass is \(\mu\), how high does the coin appear to be raised to an observer looking perpendicularly into the glass?

  • A. \(\frac{1}{t - \mu}\)
  • B. \(\frac{t(\mu - I)}{\mu}\)
  • C. t (1 + \(\frac{1}{\mu}\))
  • D. -\(\mu\)
  • E. \(\mu\)t
View Answer & Discuss (4) JAMB 1984
28

The electromotive force obtained from a simple dynamo may be increased by

  • A. increasing the cross-sectional area of the coil
  • B. winding the coil on a soft-iron armature so as to decrease the magnetic flux through the coil
  • C. increasing the speed of rotation
  • D. making the field magnet longer
  • E. using low-resistance copper coils
View Answer & Discuss (6) JAMB 1984
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29
A gun of mass 2.0kg fires a bullet of mass 16 x 10 -2kg due East. If the bullet leaves the nozzle of the gun with a velocity of 150ms-1, what is the recoil velocity of the gun?
  • A. 150ms-1 due West
  • B. 1.2 x 10-4ms-1 due West
  • C. 1.2ms-1 due West
  • D. 1.2ms-1 due East
  • E. 150ms-1 due East
View Answer & Discuss (3) JAMB 1984
30
Which of the following is a correct explanation of the inertia of a body?
  • A. ability to overcome the earth's gravity
  • B. reluctance to stop moving
  • C. readiness to start moving
  • D. reluctance to start moving and its readiness to stop moving once it has begun to move
  • E. reluctance to start moving its reluctance to stop moving once it has begun to move
View Answer & Discuss (9) JAMB 1984
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