Waec Physics 2013 Past Questions and Answers

Question 41:

• WAEC 2013

Which of the following statements about the use of radioisotopes is not correct? They are used to

A. Induce mutations in plants and animals to obtain new and improved varieties
B. Trace the paths of metabolic processes in plants and animals
C. Estmate the age of rocks
D. Locate broken bones

Question 42:

• WAEC 2013

Which of the following phenomena supports the theory that waves have a particle nature?

A. Electron diffraction
B. Photoelectric effect
C. Diffraction of light
D. X-ray interference

Question 43:

• WAEC 2013

A block of wood of mass 5kg is pulled on a platform by a force of 40N as illustrated in the diagram above. If the frictional force, F experienced by the block is 12N, calculate the magnitude of the acceleration of the acceleration of the block

A. 2.4ms^-2
B. 5.6ms^-2
C. 8.0ms^-2
D. 2.4ms^-2

Question 44:

• WAEC 2013

Four co-planar forces of magnitudes 10N, 17N, 6N and 20N act at point O as shown in the above diagram. Determine the magnitude of the resultant force

A. 53.N
B. 21.0N
C. 7.0N
D. 5.0N

Question 45:

• WAEC 2013

The outlet of a bicycle pump is used to inflate a football as illustrated in the diagram above. Why does the pressure of the air inside the pump increases as the pump handle is slowly pushed downward at constant temperature?

A. Momentum of the air molecules are increased
B. Volume occupied by the molecules are increased
C. Frequency of collision of the air molecules with the walls of the pump is increased
D. More air molecules are collidin with one another in the system