TO GF STEAM SCIENCE SMP

When an electric current passes through a gas, it gives energy to the gas, which is then released as light. This is called a line emission spectrum. What is the color of the light?

• All elements always emit a blue color of light.

• Some elements emit random colors of light.

• Each element emits different unique colors of light.

• All elements emit a spectrum of light from blue to red.

Which statement is correct about the motion of planets in the solar system when the planet position is closest to the Sun?

• The speed is the fastest because its kinetic energy is the highest.

• The speed is the fastest because its kinetic energy is the lowest.

• The speed is the slowest because its kinetic energy is the highest.

• The speed is the slowest because its kinetic energy is the lowest.

The sun is a hot ball of gas. It gives off heat and light energy that the Earth absorbs. This heat from the sun is essential for life on Earth. What is the source of the Sun's heat?

• Gravitational contraction

• Nuclear fission

• Nuclear fusion

• Dark matter

Which of the following supports the idea that the universe had a beginning?

• The Sun’s rotation

• The Earth’s gravity

• The expansion of galaxies

• The Moon’s phases

The Moon’s rotation matches its orbit around Earth. Why is this important?

• So the Moon can orbit the Earth faster

• So we always see the same face of the Moon from Earth

• So the Moon doesn't spin at all

• So lunar eclipses happen regularly

A student says that a light-year is the time it takes for light to travel around the Sun. Is this correct? Why or why not?

• No, because it measures distance, not time

• Yes, light completes a trip in one year

• No, it's how long the Earth orbits the Sun

• Yes, but only in other galaxies

Which observation shows that the space between galaxies is increasing over time?

• Galaxies appear more colorful

• Galaxies are shifting to red wavelengths

• Some stars are disappearing

• The Sun’s energy is decreasing

Scientists estimate the age of the universe to be around:

• 3 billion years

• 5 billion years

• 14 billion years

• 21 billion years

A robot needs to detect a wall in front of it. Which sensor would be most useful?

• Light sensor

• Ultrasonic sensor

• Heat sensor

• Motion sensor

Why does sound travel faster in steel than in water?

• Because solids are colder

• Because sound travels better in liquids

• Because particles in steel are more tightly packed

• Because water absorbs more sound