EmSAT EmSAT Physics 6

Question 1

What causes a magnetic field around a current-carrying wire?

Accepted Answer

Moving electric charges (current)

Answer

A magnetic field is produced by moving electric charges, i.e., electric current. This is the basis of electromagnetism, discovered by Oersted.

Question 2

What is the principle behind an electric generator?

Accepted Answer

Electromagnetic induction

Answer

An electric generator works by electromagnetic induction: moving a conductor through a magnetic field (or changing the magnetic flux) induces an electromotive force (EMF) and generates current.

Question 3

What is the formula for pressure?

Accepted Answer

P = F/A

Answer

Pressure = Force ÷ Area (P = F/A). It is measured in Pascals (Pa), where 1 Pa = 1 N/m².

Question 4

What does Archimedes' principle state?

Accepted Answer

The buoyant force equals the weight of fluid displaced

Answer

Archimedes' principle states that the buoyant force on an object equals the weight of the fluid displaced by that object. This explains why objects float or sink.

Question 5

What is absolute zero on the Kelvin scale?

Accepted Answer

0 K

Answer

Absolute zero is 0 K (Kelvin), equivalent to −273.15°C. It is the theoretical lowest possible temperature, where particles have minimum thermal energy.

EmSAT Practice Test

EmSAT Practice Test

EmSAT EmSAT Physics 6