Waec Physics 2017 Past Questions and Answers

Question 16:

• WAEC 2017

The energy stored in a spring of stiffness constant k = 2000\(Nm^{-1}\) when extended 4cm is

A. 0.16J
B. 1.60J
C. 16.00J
D. 160.00J

Question 17:

• WAEC 2017

Ice of mass 50g at 0°C was completely melted by 70% of the total heat energy supplied. Calculate the total heat energy supplied [Specific latent heat of fusion of ice = 336\(Jg^{-1}\)]

A. 2400J
B. 6800J
C. 7251J
D. 24000J

Question 18:

• WAEC 2017

A plane is inclined at an angle \(\theta\) to the horizontal. Its velocity ratio is

A. \(sin\theta\)
B. \(tan\theta\)
C. \(\frac{1}{sin\theta}\)
D. \(\frac{1}{tan\theta}\)

Question 19:

• WAEC 2017

The diagram above illustrates a beaker of water being heated. It is observed that as the bubbles rise they get bigger in size.The reason for this observation is

A. Water pressure on the bubbles decreases
B. Density of water increases with rise in temperature
C. Volume of water increases with rise in temperature
D. Atmospheric pressure on the bubbles decreases

Question 20:

• WAEC 2017

Which of the following devices converts light energy to electrical energy?

A. Bulb
B. Television
C. Solar cell
D. Light emitting diode (LED)