Waec Physics 2005 Past Questions and Answers

Question 51:

• WAEC 2005

Uranium of atom number 92 and mass number 238 emits an alpha particle from its nucleus. The new nucleus formed has respectively, atomic number and mass number

A. 94 and 238
B. 90 and 236
C. 88 and 234
D. 90 and 234

Question 52:

• WAEC 2005

A stone thrown horizontally from the top of a vertical ice is completely melted. Determine the total mass of wall with a velocity of 15ms\(^{-1}\), hits the horizontal ground water in the container at a point 45m from the base of the wall. Calculate the specific latent heat of steam = 2.3 x 10\(^3\) Jg\(^{-1}\) height of the wall. [g = 10ms\(^{-2}\)]

Question 53:

• WAEC 2005

A ball is projected specific latent heat of ice = 3.4 x 10\(^{2}\) Jg\(^{-1}\) horizontally from a height of 20m above the ground specific heat capacity of water = 4.2 Jg\(^{-1}\) K\(^{-1}\) with an initial velocity of 0.4ms\(^{-1}\). Calculate the horizontal distance moved by the ball before hitting the ground. [g = 10ms\(^{-1}\)]

Question 54:

• WAEC 2005

Describe, with the aid of a diagram, how a wave can be plane polarized.

Question 55:

• WAEC 2005

(a) Explain cations (b) Draw and label an electrolytic cell.