Polytechnic Physics 3

Question 1

What is the Doppler Effect?

Accepted Answer

The change in frequency of a wave due to relative motion between source and observer

Answer

The Doppler Effect describes how the observed frequency of a wave changes when the source or observer is moving relative to each other.

Question 2

What is the Second Law of Thermodynamics?

Accepted Answer

Entropy of an isolated system always increases over time

Answer

The Second Law states that entropy (disorder) in an isolated system tends to increase, making certain processes irreversible.

Question 3

What is nuclear fission?

Accepted Answer

Splitting of a heavy nucleus into two lighter nuclei, releasing energy

Answer

Nuclear fission is the process where a heavy atomic nucleus (like uranium-235) splits into smaller fragments, releasing a large amount of energy.

Question 4

What is the relationship between force and acceleration in Newton's Second Law?

Accepted Answer

Force is directly proportional to acceleration

Answer

F = ma shows that force is directly proportional to acceleration — doubling force doubles acceleration for a fixed mass.

Question 5

What is electromagnetic induction?

Accepted Answer

Generation of an electric current by a changing magnetic field

Answer

Electromagnetic induction, discovered by Faraday, is the production of an EMF (and thus current) in a conductor due to a changing magnetic flux.

Polytechnic Practice Test