Waec Physics 2020 Past Questions and Answers

Question 26:

• WAEC 2020

What factors determine the frequency of a note emitted by a vibrating string?

A. Amplitude of vibration, force constant of string and length of string
B. Amplitude of vibration, force constant of string, and tension in string
C. Mass per unit length of string, tension in string and length of string
D. Force constant of string, tension in string, and length of string.

Question 27:

• WAEC 2020

The magnitude of the force experienced by a charge of 1.6 x 10\(^{-8}\)C in a uniform electric field of intensity 5 x 105NC\(^{-1}\) is

A. 3.2 x 10\(^{-14}\)N
B. 8.0 x 10\(^{-13}\)N
C. 8.0 x 10\(^{-3}\)N
D. 3.1 x 10\(^{13}\) N

Question 28:

• WAEC 2020

A motorcycle starting from rest is uniformly accelerated such that its velocity in 10s is 72kmhr\(^{-1}\). What is its acceleration?

A. 108ms\(^2\)
B. 86ms\(^2\)
C. 4ms\(^2\)
D. 2ms\(^2\)

Question 29:

• WAEC 2020

The temperature of an object is raised by 120°C. The resulting increase in its absolute temperature is

A. 50K
B. 120 K
C. 200K
D. 393K

Question 30:

• WAEC 2020

Which of the following statements about the motion of a simple pendulum is true?

A. It is a simple harmonic motion when the angle of displacement is large
B. It passes the equilibrium position with minimum speed
C. It possesses maximum kinetic energy at the extreme positions
D. Lt swings faster at the poles than at the equator