Waec Physics 2017 Past Questions and Answers

Question 56:

• WAEC 2017

(a) State two factors on which surface tension depends.
(b) How can mosquito larvae be made to sink in stagnant water?

Question 57:

• WAEC 2017

List three advantages of fluorescent tubes over filament bulbs.

Question 58:

• WAEC 2017

List three advantages of p - n junetion diode over diode valve.

Question 59:

• WAEC 2017

(a) State two deductions that can be made from a displacement-time graph.
(b) If the distance beween two equal masses is doubled and their individual masses are also doubled, what would happen to the force between them? Support your answer quantitatively.
(c) State two factors that affect the maximum height attained by a bullet fired from a gun.
(d) State two practical examples of mechanical resonance. A body is released from rest at the top of a plane inclined at 30° to the horizontal and 4.0 m high. If the coefficient of friction between the body and the plane is 0.3, calculate the time the body takes to reach the bottom of the plane.

Question 60:

• WAEC 2017

(a) Define stable equilibrium as applied to a rigid body.
(b) Sketch a block and tackle system of pulleys with a velocity ratio of 3.
(c) At the beginning of a race, a tyre of volume 8.0 x 10\(^{-4}\) at 20°C-has a gas pressure of 4.5 x 10\(^5\) Pa. Calculate the temperature of the gas in the tyre at the end of the race if the pressure has risen to 4.6 x 1 0\(^5\) Pa.
(d)(i)

	Ice point273k	373kSteam point
Resistance/\(\Omega\)	5.67	7.75
Pressure/Pa	7.13 x 10\(^4\)	9.74 x 10\(^4\)

The table above shows readings of the resistance and pressure of a platinum resistance thermometer and a constant-volume gas thermometer respectively, when immersed in the same liquid bath. Use this data to determine the temperature of the bath on the: (\(\alpha\)) resistance thermometer; (\(\beta\)) gas thermometer
(ii) By what percentage is the temperature measured on the platinum resistance thermometer in error?