Waec Physics 2002 Past Questions and Answers

Question 21:

• WAEC 2002

The silver coating on the inside of a vacuum flask reduces heat loss by

A. Conduction
B. Radiation
C. Condensation
D. Convention

Question 22:

• WAEC 2002

Water of mass 120g at 50^oC is added to 20og of water at 10^oC and the mixture is well stirred. Calculate the temperature of the mixture. [Neglect heat losses to the surrounding]

A. 60^oC
B. 40^oC
C. 25^oC
D. 10^oC

Question 23:

• WAEC 2002

Calculate the energy required to vapourise 50g of water initially at 80^oC.[specific heat capacity of water = 2260Jg^-1K^-1][specific latent heat of vaporisation of water = 2260Jg^-1]

A. 113,000J
B. 117,200J
C. 234,400J
D. 420,000J

Question 24:

• WAEC 2002

What type of motion does the skin of a 'talking' drum perform when it is struck with a drum stick?

A. Random
B. Rational
C. Translational
D. Vibratory

Question 25:

• WAEC 2002

A slinky spring fixed at one end is placed horizontally on a table. The free end is displaced parallel to the table and then released. The resultimg wavelength is

A. Transverse
B. Longitudinal
C. Stationary
D. Electromagnetic