Polytechnic Physics 2

Question 1

What is the formula for gravitational potential energy?

Accepted Answer

PE = mgh

Answer

Gravitational potential energy is PE = mgh, where m is mass, g is gravitational acceleration, and h is height.

Question 2

What is absolute zero on the Kelvin scale?

Accepted Answer

0 K

Answer

Absolute zero is 0 K, which corresponds to -273.15°C, the theoretical lowest possible temperature.

Question 3

What phenomenon describes the bending of light as it passes through a lens?

Accepted Answer

Refraction

Answer

Refraction is the bending of light as it passes through a medium of different optical density, as in a lens.

Question 4

What is the formula for work done by a constant force?

Accepted Answer

W = F × d × cos(θ)

Answer

Work equals force times displacement times the cosine of the angle between them: W = Fd·cos(θ).

Question 5

What does the photoelectric effect demonstrate?

Accepted Answer

Light behaves as particles (photons)

Answer

The photoelectric effect shows that light ejects electrons from a metal surface only when its frequency exceeds a threshold, proving light's particle nature.

Polytechnic Practice Test

Polytechnic Practice Test

Polytechnic Physics 2