Unit 6 Science Test

Helen takes some bread out of the oven. Why does she use oven mitts?

• Her hands will look better.

• Her hands are cold.

• She wants to keep clean.

• She wants to protect her hands from the heat.

Answer explanation

Helen uses oven mitts to protect her hands from the heat of the oven. The other options do not address the primary reason for using mitts, which is to prevent burns or injuries from hot surfaces.

A mover pushes a box up a ramp. Which produces the most heat?

• box moving against the ramp

• ramp sitting against the truck

• wind pushing against the box

• mover’s hands on the box

Answer explanation

The box moving against the ramp generates friction, which produces heat. This friction is greater than the other options, making it the primary source of heat in this scenario.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

At a party, there are ice cream, balloons, and a cake with lit candles. Which most likely has the highest temperature?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-4

Ezra sets a bowl of hot soup on a table. Which statement best describes what happens when he puts the spoon in the soup?

• The air’s temperature will decrease.

• The soup’s temperature will increase.

• The bowl’s temperature will increase.

• The spoon’s temperature will increase.

Answer explanation

When Ezra puts the spoon in the hot soup, heat transfers from the soup to the spoon, causing the spoon's temperature to increase. This is due to the principle of thermal conduction.

Tags

NGSS.MS-PS1-4

Gloves protect people’s hands from friction by

(a)  

• They prevent blisters.

• They keep hands clean.

• They keep germs off.

• They prevent scratches.

Answer explanation

Gloves protect hands from friction primarily by preventing blisters, which occur due to skin rubbing against surfaces. While they also keep hands clean and protect from germs and scratches, the main function related to friction is blister prevention.

Juan has a beaker filled with ice and water. How will heat move to melt the ice?

• from the ice into the water

• from the water into the ice

• from the water into the air

• from the beaker into the air

Answer explanation

Heat moves from the water into the ice because the warmer water transfers energy to the colder ice, causing it to melt. This process continues until thermal equilibrium is reached.

Tags

NGSS.MS-PS1-4

At a party, there are ice cream, balloons, and a cake with candles. Which direction has the greatest heat movement?

• air to ice cream

• cake to candles

• balloon to air

• ice cream to air

Answer explanation

The greatest heat movement occurs from the cake to the candles, as the heat from the burning candles transfers to the cake, causing it to warm up. This is a direct transfer of heat energy.

Tags

NGSS.MS-PS1-4

Julie has a glass filled with ice and water. How could she make the ice melt more quickly?

• add more ice

• put a book under the glass

• put the glass under a lamp

• put the glass in a closet

Answer explanation

Putting the glass under a lamp increases the temperature around it, which helps the ice absorb heat more quickly and melt faster. The other options do not provide heat, so they won't speed up the melting process.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

Khalil’s family is cooking lunch on an outdoor grill. Which things are giving off heat?

• the coals and the air

• the food and the flames

• the grill and the food

• the coals and the flames

Answer explanation

The coals and flames produce heat through combustion, while the food absorbs heat from these sources. The air around the grill also gets heated by the flames and coals, making both options correct.

Which action creates the most friction and heat?

• gently brushing face paint onto your cheeks

• rubbing your bare hands together numerous times

• rubbing your soapy hands together underwater

• smoothing hand lotion onto the palms of your hands

Answer explanation

Rubbing your bare hands together creates the most friction and heat due to direct contact and repetitive motion, generating more heat compared to the other actions, which involve less friction or are performed in water.