6th Grade diagnostic test

Where would a magnifying glass have the most potential energy in reference to the same cactus (仙人掌)?

• On top of the cactus

• Half-way down the cactus.

• Almost on the ground next to the cactus.

• On the ground next to the cactus.

A grasshopper, chick, rabbit, and donkey are all traveling at the same exact speed. Which one has the most kinetic energy (动能最大)?

• grasshopper

• chick

• rabbit

• donkey

Why are temperatures at a desert by the equator higher than the north and south poles? 

• The equator receives less direct sunlight.

• The equator has more water.

• The north and south poles receive more direct sunlight.

• The north and south poles receive less direct sunlight.

As an acorn (松果) drops from a branch of a tree to the ground, ______.

• Kinetic energy is reduced.

• Potential energy is increased.

• Kinetic energy is converted into potential energy.

• Potential energy is converted into kinetic energy.

Which organelle in plant cells allows a plant to stand up strong even though it does not have bones?

• Mitochondria

  线粒体

• Cell Walls

  细胞壁

• Chloroplasts

  叶绿体

• Nucleus

  细胞核

A tennis ball, a soccer ball, and a bowling ball were all rolled at the same speed. Which had the higher kinetic energy? Why?

• Soccer ball, most mass

• Tennis ball, least mass

• Tennis ball, most mass

• Bowling ball, most mass

A car consumes energy, it responds, and it is organized into parts. Why is it not alive?

• It does not have cells.

• It does not have atoms (原子).

• It does not have molecules.

• It coverts energy into motion.

Which material best conduct heat?

• wooden rod

• copper wire

• cotton string

• rubber tube

Heat transfer in boiling water.

• Conduction
• Convection
• Radiation

Heat transfer in the image.

• conduction
• convection
• radiation