MDCAT Physics MCQs

Coulomb's law describes electrostatic force between point charges.
The force acts along the line joining the charges.

Electric field is a vector quantity E=F/q.
Its direction is the force direction on a positive test charge.

Frequency is cycles divided by time.
20/5 = 4 Hz.

For an open pipe, fundamental wavelength is 2L=1.7 m.
F=340/1.7 = 200 Hz.

Period is the reciprocal of frequency.
T=1/5 = 0.2 s.

For a closed pipe, fundamental wavelength is 4L=3.4 m.
F=340/3.4 = 100 Hz.

Use v=fλ.
λ=12/3 = 4 m.

Electric charge occurs in positive and negative forms.
Like charges repel and unlike charges attract.

Wave speed is v=fλ.
V=8×2.5 = 20 m/s.

Frequency is speed divided by wavelength.
F=340/0.68 = 500 Hz.

Period is total time divided by number of cycles.
30/15 = 2 s.

Frequency is reciprocal of period.
F=1/0.5 = 2 Hz.