Waec Physics 1997 Past Questions and Answers

Question 41:

• WAEC 1997

A magnet is being inserted into a coil of wire. On which of the following factors does the induced e.m.f in the coil depend? I. Number of turns in the coil II. Strength of the coil III. Speed with which magnet is inserted into the coil.

A. I only
B. II only
C. III only
D. I and II only
E. I, II,III only

Question 42:

• WAEC 1997

The current in a series R-L-C circuit attains its maximum value when the

A. Impedance is greater than the capacitive reactance
B. Inductive reactance is equal to the capacitive reactance
C. Inductive reactance is greater than the capacitive reactance
D. Capacitive reactance is less than resistance
E. Inductive reactance is greater than the capacitive reactance

Question 43:

• WAEC 1997

A charge of 1 x \(10^{-5}\)C experiences a force of 40N at a certain point in space. What is the magnitude of the electric field intensity at the point in Newton and couloumb

A. 8 x \(10^{6}\)
B. 4 x \(10^{6}\)
C. 3 x \(10^{-4}\)
D. 2 x \(10^{-4}\)
E. 5 x \(10^{-7}\)

Question 44:

• WAEC 1997

A capacitor of capacitance 25µF is connected to an a.c power source of frequency 200/πHz. Calculate the reactance of the capacitor

A. 0.01Ω
B. 0.02Ω
C. 50Ω
D. 100Ω
E. 150Ω

Question 45:

• WAEC 1997

During the electrolysis of copper (II) tetraoxosulphate (VI) solution, an ammeter shows a steady reading of 1A for 30minutes while 6.6 x \(10^{-4}\)kg of copper is liberated. Calculate the error in the ammeter The electrochemical equivalent of copper is 3.30 x \(10^{-7}kgC{-1}\)

A. 0.001A
B. 0.011A
C. 0.111A
D. 1A
E. 1.1A