Polytechnic Physics

Question 1

What is the speed of light in a vacuum?

Accepted Answer

3 × 10⁸ m/s

Answer

The speed of light in a vacuum is approximately 3 × 10⁸ meters per second (299,792,458 m/s exactly).

Question 2

Which law describes the gravitational force between two masses?

Accepted Answer

Newton's Law of Universal Gravitation

Answer

Newton's Law of Universal Gravitation states that the force between two masses is proportional to their masses and inversely proportional to the square of the distance between them.

Question 3

What is the unit of frequency?

Accepted Answer

Hertz (Hz)

Answer

Frequency is measured in hertz (Hz), where 1 Hz equals one cycle per second.

Question 4

What type of wave is sound?

Accepted Answer

Longitudinal wave

Answer

Sound is a longitudinal wave where the medium (air) vibrates parallel to the direction of wave propagation.

Question 5

What happens to the wavelength of light as its frequency increases?

Accepted Answer

Wavelength decreases

Answer

Since the speed of light is constant, wavelength and frequency are inversely related: λ = c/f.

Polytechnic Practice Test

Polytechnic Practice Test

Polytechnic Physics