Grade 8-9 GCSE Physics Revision Quiz

What is the unit of force?

• Newtons

• • Joules

• • Amperes

• • Kilograms

Answer explanation

The unit of force in the International System of Units (SI) is the Newton.

The acceleration of an object is directly proportional to the _____ it experiences, according to Newton's Second Law of Motion.

Answer explanation

Newton's Second Law of Motion states that the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

A wave with a high frequency would have...

• ...low energy.

• ...large wavelength.

• ...small wavelength.

• ...slow speed.

Answer explanation

In a given medium under fixed conditions, speed is constant while frequency and wavelength are inversely proportional. So, high-frequency waves have small wavelengths.

Energy can be neither created nor destroyed, but it can change forms. This statement is known as the law ___________.

Answer explanation

The law of conservation of energy states that energy can be neither created nor destroyed – only converted from one form of energy to another. This means that a system always has the same amount of energy unless it's added from the outside.

In a closed system, the total momentum before an event must be _______ the total momentum after the event.

• ...reater than...

• ...less than...

• ...equal to...

Answer explanation

This reflects the law of conservation of momentum. The total momentum of an isolated system remains constant if no external forces act on it.

Draw a schematic of a series circuit with one battery, two resistors, and one LED. Label the components.

Answer explanation

The resistance of a wire is directly proportional to its ______.

Answer explanation

The distance traveled by light can be described in what unit(s) of measurement?

• light-meter

• light-mile

• light-kilometer

• light-year

Answer explanation

A light-year is a unit often used in astronomy, and it represents the distance that light travels in one year.

Work is done when a force causes...

• ...displacement of the body.

• ...equilibrium of all the forces applied to the body.

• ...inertia of the body's motion.

• ...a decrease in speed.

Answer explanation

In Physics, work is done when a force that is applied to an object moves that object. Specifically, work is the amount of force needed to move an object a certain distance.

In terms of sound, the term 'frequency' corresponds to _____ in human perception.

Answer explanation

The frequency of a sound wave determines its pitch. Higher frequencies correspond to higher pitch, and lower frequencies correspond to lower pitch.