Waec Physics 2003 Past Questions and Answers

Question 36:

• WAEC 2003

The maximum power dissipated by a 100\(\Omega\) resistor in a circuit is 4W. Calculate the voltage across the resistor

A. 10V
B. 20V
C. 25V
D. 400V

Question 37:

• WAEC 2003

One difference between a reactance and a resistance in an alternating current circuit is

A. Resistance is larger than reactance
B. Energy is not diaaipated in a reactance
C. Energy is stored in a resistance but not in a reactance
D. The current in a reactance is lower than in the resistance

Question 38:

• WAEC 2003

The direction of induced current in a straight wire placed in magnetic field is determined by using

A. Fleming's right hand rule
B. Maxwell's screw rule
C. Faraday's law
D. Lenz's law

Question 39:

• WAEC 2003

Which of the following statements about an electromagnet is correct?

A. It is a temporary magnet
B. Its strength depends on the current
C. Its stength depends on the number of turns in its coil
D. It has permanent poles

Question 40:

• WAEC 2003

Which of the following statements is not true of the isotopes of an element? They

A. Are atoms of the same element
B. Have the same chemical properties
C. Have the same atomic number
D. Have the same mass number