Question 1

Sandra rubs her sock along a wool carpet as she walks across her house. She grabs onto a metal chair. What will most likely happen as she touches the chair?

Accepted Answer

She will get a light shock.

Answer

The charge will disappear.

Answer

The chair will repel her.

Answer

She will build up more charge.

Question 2

Mary mixed a handful of sand with a bucket of salt water. The best way to separate these two substances would be to...

Accepted Answer

pour the mixture through a fine sieve

Answer

stir the mixture with a spoon

Answer

run electricity through the mixture

Answer

pass a magnet through the mixture

Question 3

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

Accepted Answer

ice melting

Answer

leaves burning

Answer

plant decaying

Answer

nail rusting

Question 4

Unlike an electromagnet, a permanent magnet...

Accepted Answer

does not need electricity to work.

Answer

can shut down its magnetic field with the flip of a switch.

Answer

can lift heavy objects and release them.

Answer

can easily increase or decrease its magnetic field.

Question 5

How are plant cells different from animal cells?

Accepted Answer

Plant cells have cell walls and animal cells do not.

Answer

Plant cells have nuclei and animal cells do not.

Answer

Plant cells are smaller in size than animal cells.

Answer

Plant cells look more orderly than animal cells.

Question 6

Why are metal electrical wires often coated in plastic?

Accepted Answer

The plastic keeps people from being electrocuted by the metal wire.

Answer

The plastic stops electricity from moving through the metal wire.

Answer

Plastic keeps the electricity constant in the metal wire.

Answer

Plastic helps the metal wire conduct electricity better.

Question 7

Which of the following uses electrical energy?

Accepted Answer

spinning fan

Answer

burning candle

Answer

guitar being played

Answer

bicycle being ridden

Question 8

Choose the statement that is NOT true.

Accepted Answer

Humans should try to kill all the microorganisms in their bodies

Answer

Microorganisms can cause disease

Answer

Microorganisms are necessary for human health

Answer

Humans rely heavily on microorganisms for digestions of food.

Question 9

Megan creates a circuit using a AA battery, wires, and a light bulb. When the battery dies, she replaces it with a stronger battery. What will most likely happen?

Accepted Answer

The light bulb will shine brighter

Answer

The light bulb will not light up

Answer

The battery will become overloaded and explode

Answer

The wire will not conduct as much electricity.

Question 10

Which of these objects will most likely cause static electricity when rubbed together?

Accepted Answer

a balloon and hair

Answer

a block of wood and a copper wire

Answer

a magnet and nickel

Answer

a cotton towel and plastic wrap

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