PHYSICAL SCIENCE PART 1

Matthew has six cubes of different materials. Each cube has a mass of 10 grams (g). Matthew sorts the cubes into two groups using one physical property.

Which physical property did Matthew most likely use to sort the cubes into two groups? 

• density

• magnetism

• melting point

• electric conductivity

Sunlight is composed of energy that is visible to humans and energy that is not visible to humans. Which statement describes how the visible energy from the Sun is different from the nonvisible energy? 

• It travels at a different speed through space

• It travels a different distance through space

• It has different wavelengths.

• It has different amplitudes

The diagram demonstrates how a magnifying lens can make a penny appear larger. What property of the magnifying lens is most responsible for allowing it to magnify the penny? 

• It can reflect light.

• It can refract light.

• It can increase the intensity of light.

• It can increase the wavelength of light.

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Emma constructed a simple motor. When connected correctly, the copper wire coil spins.

Which of the following best describes the energy transformation that takes place between the paper clips and the spinning copper wire coil? 

• Chemical energy transforms into electrical energy.

• Mechanical energy transforms into chemical energy.

• Mechanical energy transforms into electrical energy.

• Electrical energy transforms into mechanical energy.

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Mrs. Aldaco added a room-temperature copper (Cu) cube and an aluminum (Al) cube that she just removed from the freezer to a beaker of boiling water. She left the cubes in the water for three hours.

Which of the following describes a heat flow that took place during those three hours? A.  B.  C.  D. 

• from the aluminum cube to the beaker

• from the copper cube to the boiling water

• from the aluminum cube to the copper cube

• from the boiling water to the aluminum cube

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Luis rubbed a balloon on his hair and held the balloon next to the wall. He observed the balloon stick to the wall. Which of the following is responsible for the balloon sticking to the wall? 

• gravity

• friction

• electric force

• magnetic force

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Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), and Francium (Fr) are in the same column in the periodic table. Why are these elements in the same column in the periodic table? 

• They have similar properties.

• They have atoms of the same size.

• They have the same number of protons.

• They have the same number of neutrons.

When a candle is lit, the wick burns, the wax melts, the candle changes shape, and the air around the candle heats up.

Which of the following is an example of a chemical change?

• the wick burning

• the wax melting

• the candle changing shape

• the air around the candle heating up

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The diagram below shows forces acting on a model airplane. Both its speed and height above the ground are constant.

Which of the following conditions would cause the model airplane to move toward the ground? 

• The lift is equal to the drag.

• The lift is less than the weight.

• The thrust is equal to the weight.

• The thrust is greater than the drag.

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Caleb is riding his bicycle. He works very hard to reach the top of a hill and then coasts down the other side.

Which statement best explains what happens as Caleb rides down the hill?

• Chemical energy is transformed into mechanical and thermal energy and the total amount of energy decreases at the bottom of the hill.

• The amount of mechanical energy used to ride the bike uphill is less than the amount of chemical energy used to ride the bike downhill.

• Chemical energy is transformed into mechanical and thermal energy and the total amount of energy is conserved during the entire bike ride.

• The amount of mechanical energy used to ride the bike uphill is greater than the amount of chemical energy used to the ride the bike downhill.

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