Waec Physics 2018 Past Questions and Answers

Question 36:

• WAEC 2018

When the speed of a car is halved, its kinetic energy is

A. Doubled
B. Quartered
C. Halved
D. Quadrupled

Question 37:

• WAEC 2018

A wire of length 400cm is stretched between two fixed points. When plucked, its fundamental frequency is 150Hz. Calculate the speed of the wave produced.

A. 250\(ms^{-1}\)
B. 625\(ms^{-1}\)
C. 1200\(ms^{-1}\)
D. 1500\(ms^{-1}\)

Question 38:

• WAEC 2018

The diagram above illustrates a waveform. Determine the number of wavelengths in it

A. 4
B. 3\(\frac{1}{2}\)
C. 2\(\frac{1}{2}\)
D. 2

Question 39:

• WAEC 2018

A resistor with fixed resistance value is called a

A. Resistance box
B. Standard resistor
C. Shunt resistor
D. Multiplier resistor

Question 40:

• WAEC 2018

Which of the following statements is not an advantage of an alkaline accumulator?

A. The electrolyte does not need attention
B. It can be recharged
C. It has low internal resistance
D. It has a much longer life than lead-acid accumulator