Post Utme Physics Past Questions and Answers

Question 546:

If the maximum voltage across a 100 Ohm resistor is \(20 \mathrm{~V}\), then the maximum power it can dissipate is ____________

A. \(5.00 W\)
B. \(4.00 \mathrm{~W}\)
C. \(2.00 \mathrm{~W}\)
D. \(0.25 \mathrm{~W}\)

Question 547:

A solid weighs \(10.0 \mathrm{~N}\) in air, 6.0N when fully immersed in water and 7.0N when fully immersed in a certain liquid \(X\). Calculate the relative density of the liquid

A. \(5 / 3\)
B. \(4 / 3\)
C. \(3 / 4\)
D. \(7 / 10\)

Question 548:

A man stands \(4 \mathrm{~m}\) in front of a plane mirror. If the mirror is moved \(1 \mathrm{~m}\) towards the man, the distance between him and his image is ____________

A. \(3 m\)
B. \(5 \mathrm{~m}\)
C. \(6 \mathrm{~m}\)
D. \(10 \mathrm{~m}\)

Question 549:

An astronomical telescope is said to be in normal adjustment when the ____________

A. Eye is accommodated
B. Focal length of objective lens is Ionger than that of the eye piece.
C. Final image is at near point of the eye
D. Final image is at infinity

Question 550:

The core of an efficient transformer should consist of laminated pieces of metal in order to ____________

A. Increase the heat produced by increasing eddy current
B. Increase the heat produced by reducing eddy current
C. Reduce the heat produced by increasing eddy current
D. Reduce the heat produced by reducing eddy current 35. A 3000W electric cooker is to be used on a \(200 \mathrm{~V}\) mains current.