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Difficult Problems in Physics From post utme (Absu 2005)
Physics
Chima Sunday (Tutor)
31-03-2016 14:32:00 +0000A lot of people that attempted these questions got it wrong, try and see if you can get it right.
Question 11 An electric cell has an internal resistance of 20hm. A current of 0.5A is found to flow when a resistor of 50hms resistance is connected across it. What is the electromotive force of the cell.
Option A 5volts.
Option B 3.5volts.
Option C 2.5volts.
Option D 1 volt .
.
Which of the following is true for the image formed by a convex mirror? I. The image is always virtual II. The image is always erect III. The image is never magnified IV. the focal length is negative.
Option A I only.
Option B I and II only.
Option C I, II and III only.
Option D I, II, III and IV only
Solutions
Question 11
recall that emf = IR + Ir = I(R + r) when in series configuration
where R = external resistance, r = internal resistance of the cell
thus I = 0.5A, R = 5ohms and r = 2ohms
emf = 0.5(5 + 2) = 0.5 * 7 = 3.5V
correct option is B
Question 2
below is then characteristics of the image formed by a convex mirror
1. it is virtual
2. diminished i.e never magnified
3. it is erect
So from the above the correct option is C.
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Sheunfuhmei Damilola
First question answer is A, and the second one is B
0 31-03-2016 20:44:00 +0000
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Chima Sunday (Tutor)
Thumb up to all of you that really tried to try this problem, i really appreciate keep it up. cheers!
0 04-04-2016 15:17:00 +0000
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