Density, hot air, cold air and light

What is the density of a material?

• The density of a material is the amount of weight it has in relation to its volume.

• The density of a material is the amount of temperature it has in relation to its volume.

• The density of a material is the amount of mass it has in relation to its volume.

• The density of a material is the amount of energy it has in relation to its volume.

What happens to hot air when it is heated?

• It cools down and descends

• It expands and rises

• It solidifies and stays in the same place

• It turns into liquid

Tags

NGSS.MS-ESS2-5

NGSS.MS-ESS2-6

What happens to cold air when it cools down?

• It becomes denser and descends

• It becomes less dense and rises

• It remains the same

• It turns into vapor

Tags

NGSS.MS-ESS2-5

What is the angle of reflection if a ray of light strikes a flat surface forming an angle of 30 degrees with the normal?

• 30 degrees.

• 60 degrees.

• 90 degrees.

• 45 degrees.

Tags

NGSS.MS-PS4-2

What happens when light falls on a dark object?

• The dark object absorbs the light and reflects very little, so it looks dark, and rises its temperature.

• The dark object changes color to white

• The dark object becomes transparent, and cools down

• The dark object emits light intensely

Tags

NGSS.MS-PS1-4

NGSS.MS-PS4-2

NGSS.MS-PS3-4

How does the density of water compare to the density of oil?

• The density of oil is greater than the density of water.

• The density of water is greater than the density of oil.

• The density of water and oil are equal.

• The density of water decreases with temperature.

Why do balloons inflate when heated?

• Balloons inflate because they contain helium inside, which expands when heated.

• The air molecules move faster and spread out, increasing the internal pressure and causing the balloon to inflate.

• Heat causes the air molecules to cool down and contract, which inflates the balloon.

• The high temperature causes the balloon to absorb more air from the environment, inflating in the process.

Tags

NGSS.MS-PS1-4

What effect does cold have on a balloon inflated with hot air?

• The cold causes the balloon to change color.

• The cold causes the balloon to inflate more.

• The cold causes the balloon to deflate.

• The cold causes the balloon to explode.

Tags

NGSS.MS-PS1-4

What type of surface reflects light the best?

• Polished and shiny surface

• Matte surface

• Rough and opaque surface

• Transparent surface

Tags

NGSS.MS-PS4-2

Why do dark objects heat up faster under sunlight?

• Dark objects heat up faster under sunlight because they emit more sunlight than light objects.

• Dark objects heat up faster under sunlight because they are cooler than light objects.

• Dark objects heat up faster under sunlight because they reflect more sunlight than light objects.

• Dark objects heat up faster under sunlight because they absorb more sunlight than light objects.

Tags

NGSS.MS-PS3-3