Post Utme Federal University of Technology, Akure Physics Past Questions and Answers

Question 16:

An object of mass \(10 kg\) is pulled over a rough surface by a \(20 N\) force. The object accelerates at a rate of \(1.5 m / s 2\).
Determine the frictional force between the object and the surface.

A. \(30 N\)
B. \(20 N\)
C. \(2 N\)
D. \(5 N\)

Question 17:

A body of mass \(2 kg\), moving with velocity \(5 m / s\) collides with stationary body of mass \(0.5 kg\) if the two bodies move together after impact.
Calculate their common velocity.

A. \(10 m / s 2\)
B. \(4 m / s 2\)
C. \(2.5 m / s\)
D. \(0.5 m / s 2\)

Question 18:

A body of mass \(200 g\) and specific heat capacity \(0.4\) \(J / g . K\) cools from \(370 C\) to \(310< C >\)
Calculate the quantity of heat released by the body.

A. \(4800 J\)
B. \(1200 J\)
C. \(480 J\)
D. \(202 J\)

Question 19:

The length of mercury thread when it is at \(0 \circ C\), \(1000 C\) and unknown temperature XoC is \(200 mm\), \(220 mm\) and \(270 mm\) respectively. Determine the value of \(X\).

A. \(3500 C\)
B. \(57 \circ C\)
C. \(133 \circ C\)
D. \(300 \circ C\)

Question 20:

The linear expansivity of a substance is \(1,2 \times 10\) \(4 / K\). A cube of this substance has a volume of \(8.0 \times 103 cm 3\) at \(300< C >\)
Calculate the increase in itsvolumeat \(800 C\)

A. \(48 cm 3\)
B. \(24 cm 3\)
C. \(96 cm 3\)
D. \(72 cm 3\)