Waec Physics 2007 Past Questions and Answers

Question 56:

• WAEC 2007

(a) List two factors that can affect the rate of diffusion
(b) State two examples to illustrate the effects of surface tension.

Question 57:

• WAEC 2007

State two effects to show (a) the existence of matter waves;
(b) that radiation behaves like particles.

Question 58:

• WAEC 2007

A stone projected horizontally from the top of a tower with a speed of 4 ms\(^{-1}\) lands on the level ground at a horizontal distance 25 m from the foot of the tower. Calculate the height of the tower. g = 10 ms\(^{-2}\)]

Question 59:

• WAEC 2007

Define (a) tensile Stress; (b) tensile strain; (c) yield point.

Question 60:

• WAEC 2007

(a) State the conditions of equilibrium for a number of coplanar parallel forces.
(b) A metre rule is found to balance horizontally at the 48 cm mark. When a body of mass 60 g is suspended at the 6 cm mark, the balance point is found to be at the 30 cm mark. Calculate the;
(i) mass of the metre rule;
(ii) distance of the balance point from the zero end, if the body were moved to the 13 cm mark.
(c) a man pulls up a box of mass 70 kg using an inclined plane of effective length 5 m unto a platform 2.5 m high at a uniform speed. If the frictional force between the box and the plane is 1000 N;
(i) draw a diagram to illustrate all the forces acting on the box while in motion;
(ii) calculate the I. minimum effort applied in pulling up the box; II. velocity ratio of the plane, if it is inclined at 30° to the horizontal; Ill. force ratio of the plane.