Waec Physics 2014 Past Questions and Answers

Question 51:

• WAEC 2014

A tennis ball projected at an angle 0 attains a range R = 78. If the velocity imparted to the ball by the racket is 30 ms${}^{-1}$, calculate O. [ g = 10 ms${}^{-2}$]

Question 52:

• WAEC 2014

An electron moves with a speed of 2.00 x 10${}^7$ ms${}^{-1}$ in an orbit in a uniform magnetic field of 1.20 x 10${}^{-3}$ T. Calculate the radius of the orbit. [Mass of an electron = 9.11 x 10${}^{-3}$ kg; charge on an electron = 1.61 x 10${}^{-19}$C]

Question 53:

• WAEC 2014

A metallic bar 50 cm long has a uniform cross-sectional area of 4.0 cm${}^2$. If a tensile force of 35 kN produces an extension of 0.25 mm, calculate the value of Young's modulus

Question 54:

• WAEC 2014

(a) Explain how a gas can be made to conduct electricity.
(b) Name the electric charge carriers in gases.

Question 55:

• WAEC 2014

The diagram above represents the graph of electron energy against the frequency of the radiation incident on a metal surface. Interpret the: (a) slope of the graph; (b) intercept, OC; (c) intercept, OK.