Post Utme Physics Past Questions and Answers

Question 566:

A convex lens of focal length \(f\), forms a real image whose size is the same as that of the object.

The object distance is equal ____________

A. 4F
B. \(2 F\)
C. \(F\)
D. \(F / 2\)
E. \(F / 4\)

Question 567:

2 spheres of masses \(5 \mathrm{~kg}\) and \(10 \mathrm{~kg}\) are \(0.3 \mathrm{~m}\) apart. Calculate the force of attraction between them

\(\left[G=6.67 \times 10^{-11} \mathrm{Nm}^{2} \mathrm{~kg}^{-2} \right]\)

A. \(3.50 \times 10^{-11} \mathrm{~N}\)
B. \(3.71 \times 10^{-8} \mathrm{~N}\)
C. \(3.57 \times 10^{-2} \mathrm{~N}\)
D. \(4.00 \times 10^{-2} \mathrm{~N}\)

Question 568:

A 200W heater is used to heat a metal object of mass \(5 \mathrm{~kg}\) initially at \(10^{\circ} \mathrm{C}\). if the temperature rise of \(30^{\circ} \mathrm{C}\) is obtained after \(10 \mathrm{~mm}\), the heat capacity of the material is ___________

A. \(1.2 \times 10^{4} \mathrm{~J}^{\circ} \mathrm{C}^{-1}\)
B. \(6.0 \times 10^{4} \mathrm{~J}^{\circ} \mathrm{C}^{-1}\)
C. \(8.0 \times 10^{4} \mathrm{~J}^{\circ} \mathrm{C}^{-1}\)
D. \(4 \cdot 010^{4} \mathrm{~J}^{\circ} \mathrm{C}^{-1}\)

Question 569:

A boy drags a bag of rice along a smooth horizontal floor with a force of \(2 \mathrm{~N}\) applied at an angle of \(60^{\circ}\) to the floor. The work done after a distance of \(3 \mathrm{~m}\) is ____________

A. 3J
B. 4J
C. 5J
D. 6J

Question 570:

A car of mass \(1500 \mathrm{~kg}\) goes round a circular curve of radius \(50 \mathrm{~m}\) at a speed of \(40 \mathrm{~ms}^{-1}\). The magnitude of the centripetal force on the car is ____________

A. \(4.8 \times 10^{4} \mathrm{~N}\)
B. \(4.8 \times 10^{3} \mathrm{~N}\)
C. \(1.2 \times 10^{4} \mathrm{~N}\)
D. \(1.2 \times 10^{3} \mathrm{~N}\)