Jamb Physics 2012 Past Questions and Answers

Question 76:

• JAMB 2012

A stone of mass 1kg is dropped from a height of 10m above the ground and falls freely under gravity. Its kinetic energy 5m above the ground is then equal to

A. Its kinetic energy on the ground
B. Twice its initial potential energy
C. Its initial potential energy
D. Half its initial potential energy

Question 77:

• JAMB 2012

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

Question 78:

• JAMB 2012

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°

Question 79:

• JAMB 2012

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

Question 80:

• JAMB 2012

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