1. A change of position with respect to a reference point is
A, acceleration

C. velocity
B. direction
D. motion
2. The rate at which velocity changes is called
A. acceleration
C. average speed
B. constant speed
D. velocity
3. It is the distance between two consecutive crests or troughs of a wave.
A. frequency
C. wavelength
B. amplitude
D. velocity
4. Energy from the sun reaches the earth through
A. infrared waves
C. mechanical waves
B. ultraviolet waves
D. electromagnetic waves
5. Which of the following objects will produce sound?
A. soft objects
C. vibrating objects
B. radio stations
D. objects under pressure​