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 interference of two waves

Answer

The diffraction of light around obstacles

Answer

The reflection of sound off surfaces

Question 2

What is the Second Law of Thermodynamics?

Accepted Answer

Entropy of an isolated system always increases over time

Answer

Energy is conserved in all processes

Answer

Heat always flows from hot to cold only when forced

Answer

Work done is always equal to heat added

Question 3

What is nuclear fission?

Accepted Answer

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

Answer

Combining two light nuclei to form a heavier one

Answer

Emission of radiation from an unstable nucleus

Answer

Absorption of a neutron by a nucleus

Question 4

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

Accepted Answer

Force is directly proportional to acceleration

Answer

Force is inversely proportional to acceleration

Answer

Force equals acceleration divided by mass

Answer

Force and acceleration are independent

Question 5

What is electromagnetic induction?

Accepted Answer

Generation of an electric current by a changing magnetic field

Answer

Generation of a magnetic field by a constant current

Answer

Transfer of charge between conductors

Answer

Alignment of magnetic dipoles in a field

Question 6

What is the formula for pressure?

Accepted Answer

P = F/A

Answer

P = F × A

Answer

P = F - A

Answer

P = A/F