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Wednesday, 04 November 2026
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Physics Past Questions and Answers

Jamb 2012 Physics Questions

Question 76:
If a spherical metal bob of radius 3cm is fully immersed in a cylinder containing water and the water level rises by 1cm, what is the radius of the cylinder?
  • A 12cm
  • B 1cm
  • C 3cm
  • D 6cm
View Answer & Explanation
Question 77:
The resultant of two forces acting on an object is maximum if the angle between them is
  • A 45°
  • B 0°
  • C 90°
  • D 180°
View Answer & Explanation
Question 78:
I. The earth is not spherical but elliptical in shape
II. Variation in latitude and longitude
III. Rotation of the earth on its axis
IV. Variation in the density of the earth
On which combination of the above does the weight of an object vary on the earth's surface?
  • A I, II, III and IV
  • B II, III and IV only
  • C I, II and III only
  • D I and II only
View Answer & Explanation
Question 79:
The efficiency of a machine is always less than 100% because the
  • A Work output is always greater than the work input
  • B Load lifted is always greater than the effort applied
  • C Effort applied is always greater than the load lifted
  • D Velocity ratio is always greater than the mechanical advantage
View Answer & Explanation
Question 80:
Which of the following consists entirely of vector quantities?
  • A Velocity, magnetic fulx and reaction
  • B Tension, magnetic flux and mass
  • C Displacement, impulse and power
  • D Work, pressure and moment
View Answer & Explanation