Year 9 - Particles and Waves Practice Test

What is transferred when heating by conduction?

• Light energy

• Thermal energy

• Kinetic energy

• Sound energy

Which material is a thermal conductor?

• Metal

• Plastic

• Wood

• Glass

Why does a metal object feel colder than a wooden object at the same temperature?

• Because wood loses heat faster

• Because metal conducts heat away from your hand

• Because wood is a conductor

• Because metal is an insulator

What are convection currents?

• Movement of heat through solids

• Circulation of fluids due to density differences

What prevents heat loss in a vacuum flask?

• Plastic stopper

• Vacuum

• Silvered walls

• All of the above

What causes sound waves?

• Movement of air particles

• Vibration of particles in a medium

• Movement of electrons

• Refraction of light

The distance between two compressions is called:

• Amplitude

• Frequency

• Wavelength

• Pitch

When sound waves are close together, they are described as having:

• Low frequency

• High frequency

• High amplitude

• Low amplitude

Which of the following describes rarefaction?

• Particles are close together

• Particles are spread apart

• Particles vibrate at right angles

• None of the above

What is the approximate speed of sound in air at 20°C?

• 1500 m/s

• 343 m/s

• 5960 m/s

• 331 m/s