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• # Difficult Problems in Physics From post utme (Absu 2005)

Physics

Chima Sunday (Tutor)
31-03-2016 14:32:00 +0000

A 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.

• Ayo Emma

d

0 31-03-2016 15:21:00 +0000

• Moyosore Olufunke

b. 3.5

0 31-03-2016 16:15:00 +0000

• EMMANUEL PHILIPS

B

0 31-03-2016 16:42:00 +0000

• Blessing Onyeche

0 31-03-2016 16:53:00 +0000

• Sheunfuhmei Damilola

First question answer is A, and the second one is B

0 31-03-2016 20:44:00 +0000

any idea

0 01-04-2016 09:52:00 +0000

• Dorisusifoh Dorisusifoh

B, B

0 01-04-2016 10:51:00 +0000

• 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