Post Utme Physics Past Questions and Answers

Question 621:

A conductor has a diameter of \(1.00 \mathrm{~mm}\) and length \(2.00 \mathrm{~m}\) the resistance of the material is \(0.1 \Omega\), its resistivity is

A. \(3.93 \times 10^{-6} \Omega \mathrm{m}\)
B. \(2.55 \times 10^{2} \Omega \mathrm{m}\)
C. \(3.93 \times 10^{-8} \Omega \mathrm{m}\)
D. \(2.55 \times 10^{2} \Omega \mathrm{m}\)

Question 622:

A body of mass \(12 \mathrm{~kg}\) travelling at \(42 \mathrm{~m} / \mathrm{s}\) collides with a second body of mass \(18 \mathrm{~kg}\) at rest. Calculate their common velocity if the two bodies coalesce after collision.

A. \(1.4 \mathrm{~m} / \mathrm{s}\)
B. \(1.7 \mathrm{~m} / \mathrm{s}\)
C. 1.5m/s
D. 2.1m/s

Question 623:

if a freely suspended object is pulled to one side and released, it oscillates about the point of suspension. because the ____________

A. Velocity is minimum at the equilibrium point
B. Acceleration is directly proportional to the displacement
C. Acceleration is directly proportional to the square of the displacement
D. Motion is directed away from the equilibrium point

Question 624:

An object is placed \(10 \mathrm{~m}\) from a pinhole camera of length \(25 \mathrm{~cm}\). Calculate the linear magnification.

A. \(2.5 \times 10^{1}\)
B. \(2.5 \times 10^{2}\)
C. \(2.5 \times 10^{-1}\)
D. \(2.5 \times 10^{-2}\)

Question 625:

A perfect emitter or absorber of radiant energy is a ____________

A. Conductor
B. Black body
C. Red body
D. White body