Year 8 Physics Quiz- MC

Which material is a good conductor of electricity?

• Plastic

• Rubber

• Copper

• Glass

What causes the tides on Earth?

• The rotation of the Earth on its axis.

• The gravitational pull of the Moon and the Sun.

• Atmospheric pressure changes.

• The Earth's magnetic field.

Why is there no air resistance in a vacuum?

• Because there are no air molecules to cause resistance.

• Because gravity is absent in a vacuum.

• Because temperature is too high in a vacuum.

• Because pressure is too high in a vacuum.

What occurs during a solar eclipse?

• The Earth passes between the Moon and the Sun.

• The Moon passes between the Sun and the Earth.

• The Sun passes between the Moon and the Earth.

• The Moon's shadow falls on the Sun.

What happens to opposing forces of 10N and 30N?

• They cancel each other out.

• They add up to 40N.

• The resultant force is 20N in the direction of the larger force.

• They result in zero movement.

Why does energy dissipate in most processes?

• Energy tends to stay concentrated in one form.

• Energy tends to spread out into more disorganized forms, like heat.

• Energy is destroyed in the process.

• Energy converts into matter.

If the angle of incidence of light on a mirror is 30 degrees, what is the angle of reflection?

• 0 degrees

• 15 degrees

• 30 degrees

• 60 degrees

What does the amplitude of a sound wave represent?

• The pitch of the sound.

• The loudness of the sound.

• The speed of the sound.

• The duration of the sound.

What is gravity?

• The force that repels objects with mass.

• The force that attracts any two objects with mass.

• The force that only affects planets and stars.

• The force that prevents objects from moving.

Why is the angle of incidence generally greater than the angle of refraction when light enters a denser medium?

• Light speeds up in a denser medium.

• Light bends away from the normal.

• Light slows down and bends towards the normal.

• The density of the medium has no effect on the light.