Waec Physics 2004 Past Questions and Answers

Question 51:

• WAEC 2004

Which of the following representations is correct for an atom X with 28 electrons and 30 neutrons?

A. \(^{30}_{28} X\)
B. \(^{28}_{30} X\)
C. \(^{58}_{30} X\)
D. \(^{58}_{28} X\)

Question 52:

• WAEC 2004

In an experiment using a converging lens to produce real images on a screen, the linear magnification m, is plotted against the image distance v, as illustrated in the diagram below. The distance OP represents the

A. Focal legth of the lens
B. Thickness of the lens
C. Radius of curvature of the lens
D. Diameter of the lens

Question 53:

• WAEC 2004

In his first attempt, a long jumper took off from the spring board with a speed of 8 ms\(^{-1}\) at 30° to the horizontal. He makes a second attempt with the same speed at 45° to the horizontal. Given that the expression for the horizontal range of a projectile is \(\frac{u^2 sin 2\theta}{g}\) where all the symbols have their usual meanings, show that he gains a distance of 0.8576 m in his second attempt. [g = 10ms\(^{-2}\)]

Question 54:

• WAEC 2004

The diagram above illustrates the path ABC, in a vertical x z plane, of a bullet shot into the air at an angle above the horizontal. Copy the diagram, and, using arrows, indicate the relative magnitudes and directions of the vertical and horizontal components of the velocities of the bullet at the point A, B and C.

Question 55:

• WAEC 2004

(a) For a water voltameter, identify the;
(i) electrolyte;
(ii) electrodes;
(iii) substances deposited on the electrodes
(b)State the ratio of the volume of the substances deposited in (a) (iii) above