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. $2F$
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

$[G=6.67\times {10}^{-11}{\mathrm{Nm}}^2{\mathrm{kg}}^{-2}]$

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. $1.2\times {10}^3\mathrm{N}$