Waec Physics 2013 Past Questions and Answers

Question 36:

• WAEC 2013

Which of the following devices does not makes use of eddy current for its action? A/An

A. Galvanometer
B. Speedometer
C. Induction furnace
D. Speedometer

Question 37:

• WAEC 2013

A coil of inductance 0.12 H and resistance 4\(\Omega\), is connected across a 240V, 50Hz supply. Calculate the current through it. [\(\pi\) = 3.142]

A. 6.3A
B. 33.3A
C. 37.2A
D. 40.0A

Question 38:

• WAEC 2013

The work function of a metal is 2.56 x 10^-19J. Calculate the frequency of a photon whose energy is required to eject from the metal an electron with kinetic energy of 3.0ev. [1 eV = 1.6 x 10^-19J, h = 6.6 x 10^-34Js]

A. 5.56 x 10¹⁹Hz
B. 1.66 x 10¹⁹Hz
C. 1.12 x 10¹⁵Hz
D. 8.42 x 10¹⁴Hz

Question 39:

• WAEC 2013

The minimum energy required to cause photoelectric emission when the surface of a metal is irradiated with electromagnetic radiation of suitable frequency is called

A. Critical energy
B. Ionization energy
C. Work function
D. Planck's constant

Question 40:

• WAEC 2013

Which of the following particles are termed nucleons in a neutral atom?

A. Protons and neutrons
B. Neutrons and electrons
C. Protons and electrons
D. Protons, electrons and neutrons