Waec Physics 2008 Past Questions and Answers

Question 46:

• WAEC 2008

Control in nuclear reactors is effected with boron rods because rhe rods have the ability to

A. Absorb electrons
B. Absorb neutron
C. Accelerate electrons
D. Slow down neutrons

Question 47:

• WAEC 2008

A radioactive element has a decay constant of 0.077s^-1. Calculate its half-life

A. 13.0s
B. 9.0s
C. 5.1s
D. 0.5s

Question 48:

• WAEC 2008

The diagram above shoes three forces F₁, F₂ and F₃, which of the following ewuations is correct?

A. F₃ = F₁ + F₂
B. F₂ = F₁ + F₃
C. F₁ = F₂ - F₃
D. F₁ = F₂ + F₃

Question 49:

• WAEC 2008

A wire gradually stretched by loading it until it snaps.
(a) Sketch a load-extension graph for the wire
(b) Indicate on the graph the
(i) elastic limit (E);
(ii) yield point (Y);
(iii) breaking point (B).

Question 50:

• WAEC 2008

In an electrolysis experiment, the ammeter records a steady current of 1 A. The mass of copper deposited in 30 minutes is 0.66 g. Calculate the error in the ammeter reading. [ Electrochemical equivalent of copper = 0.00033 g C\(^{-1}\)]