Post Utme Physics Past Questions and Answers

Question 556:

A stone of mass 1kg is dropped from a height of 10m above the ground and falls under gravity, its kinetic energy 5m above the ground kinetic energy 5m above the ground is the 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 557:

Ice cubes are added to a glass of warm water. The glass and water are cooled by cooled by ____________

A. Conduction only
B. Convection only
C. Conduction and convection
D. Convection and radiation

Question 558:

Thermometric substance of an absolute thermometer is ____________

A. Alcohol
B. Mercury
C. Helium
D. Platinum

Question 559:

The cell of internal resistance r supplies current to a \(6.0\) ohms supplies current to a \(6.0\) ohms resistor and its efficiency is \(75 \%\).

Find the value of \(r\) Find the value of \(r\)

A. 4.5 Ohms
B. \(1.0\) Ohms
C. \(8.0 \mathrm{Ohms}\)
D. 10 Ohms

Question 560:

The capacitor, \(C=175\) p.f is connected to a source of alternating e.m.f of r.m.s value \(250 \mathrm{~V}\) and e.m.f of r.m.s value \(250 \mathrm{~V}\) and frequency \(50 \mathrm{H} 4\). calculate the r.m.s value of the current

A. \(6.87 \mathrm{~A}\)
B. \(13.74 \mathrm{~A}\)
C. \(4.38 \mathrm{~A}\)
D. \(0.27 \mathrm{~A}\)
E. \(16.49 \mathrm{~A}\)