which type of wave is characterized by circular motion?
a. transverse wave
b. longitudinal wave
c. primary wave
d. surface wave

D. surface wave

Explanation:

A) Transverse Waves

As the energy is propagated through the medium and then medium particles moves to and fro perpendicular to wave propagation then this is known as transverse waves.

B) Longitudinal waves

As energy is propagated through the medium and then medium particles oscillates in direction of wave propagation then it is known as longitudinal waves.

C) Primary waves

these waves are due to compression and expansion of medium and it can travel at high speed. It is moreover similar to longitudinal waves

D) Surface Waves

In these type of waves the disturbance or energy is propagated through the medium particles on the surface of the water in the shape of concentric circles.

So surface wave is characterized by circular motion

answer: option c. i.e. electric current flowing “downhill” from the negative electrode to the positive electrode in a battery

explanation:

the water analogy to the circuits define the pipes (water flows) to the electric current. now, we know that the electric current flows from the positive terminal to the circuit (as shown in the diagram attached).

hence, option c is the correct answer.

i think the answer is a, hope this : )