Fourth Grade Science Final

Iron filings and sulfur powder are combined to form a mixture. What will happen if a magnet is held over the mixture?

• The magnet will attract the entire mixture.

• The magnet will attract only the iron filings.

• The magnet will not attract any of the mixture.

• The magnet will attract only the sulfur powder

A student rubbed a balloon with a wool cloth. The balloon developed a negative charge. The student placed the balloon against a wall and let go. The balloon stayed next to the wall for a few minutes, then fell. What is the MOST likely reason the balloon fell?

• The wall gave up positive charges to the balloon.

• The balloon gave up positive charges to the wall.

• The wall gave up negative charges to the balloon.

• The balloon gave up negative charges to the wall.

When Jackson removed some clothes from the dryer, some of the socks were stuck to shirts. What could cause the clothing to stick together?

• The dryer removed the air that kept the clothing items apart.

• The socks and shirt had different types of electric charges after tumbling together.

• When the items in the dryer became warm, heat caused them to stick together.

• Removing water from the clothing items made them shrink and stick together.

A student has a mineral sample. He wonders if the sample is the mineral mica. He knows the cleavage pattern of mica is a smooth, flat sheet. The student can BEST find out the cleavage pattern of the sample by

• shining a light on the mineral.

• soaking the mineral in water.

• rubbing a penny against the mineral.

• breaking off a piece of the mineral.

Pumice is formed when magma blows out of a volcano and cools quickly. Pumice is the only rock that will float because pumice

• is a hard mineral.

• was once a liquid.

• is an igneous rock.

• contains air pockets.

Diamonds are formed when carbon is placed under extreme heat and pressure. This process occurs

• in caves.

• in the ocean.

• in the atmosphere of Earth.

• beneath the surface of Earth.

Which rock type is MOST useful in studying the history of living organisms?

• basalt

• marble

• granite

• limestone

Which of the following BEST describes what happens when a student looks in a mirror?

• The mirror acts as a light source that lights the student’s face.

• Light waves bouncing off the student’s face reflect off the mirror.

• Matter from the student’s face is transformed into light waves in the mirror.

• The student’s eyes see light waves reflecting off the mirror as solid matter.

Many leaves appear green because the leaves

• resist green light.

• bend all colors except green.

• reflect green light.

• reflect all colors except green.

Earth orbits the Sun once a year. About how many times does the Moon orbit Earth in a year?

• 1

• 7

• 13

• 28