Waec Physics 2007 Past Questions and Answers

Question 36:

• WAEC 2007

A dry plastic comb used in combing hair was found to attract pieces of paper and dust. The most probable explanation for this phenomenon is that the comb has been given

A. Magnetization by induction
B. Electric charges by induction
C. Electric charges by conduction
D. Electric charges by friction

Question 37:

• WAEC 2007

Which of the following statements is correct about resonance? Resonance occurs when a body

A. Vibrates with its natural frequency
B. Is forced to vibrate on its own natural frequency by another body at the same vibration
C. Vibrates at the frquency of the body causing the vibration
D. Vibrates with an irregular frequency

Question 38:

• WAEC 2007

Which of the following components is used for storing electric charges?

A. Inductor
B. Resistor
C. Capacitor
D. Electrometer

Question 39:

• WAEC 2007

Which of the following operations does not represent an action of a force field?

A. Falling of a mango fruit from the tree
B. Picking of nails using a bar magnet
C. Repulsion of two like charges
D. Pushing of a wheel-barrow on a level gound

Question 40:

• WAEC 2007

A bulb marked 240V, 40W is used for 30 minutes. Calculate the heat generated

A. 320J
B. 400J
C. 10800J
D. 72000J