IOWA practice 1

Which of these is a good conductor of electricity?

• Wood

• Plastic

• Stone

• Copper

A lightning rod on top of a structure protects it from lightning damage. How does a lightning rod work?

• It reflects the current from the lightning back into the cloud.

• It directs the current from the lightning into the ground.

• It absorbs the lightning, becomes hot, and then cools off.

• It sends the current from the lightning into the building’s electrical circuits.

What function do white blood cells perform?

• They carry oxygen throughout the body.

• They attack organisms that have invaded the body.

• They help digest food.

• They add calcium to bones so people can grow taller.

The formula for table salt is NaCl. The formula for water is H2O. What do these formulas tell you about a substance?

• The electrical charge of each substance

• The density of each substance

• The source of each substance

• The elements of each substance

What did the farmer vary in this study so he could learn its effect?

• A) The trees from which the apples were picked

• B) How the apples were brought to market

• C) The way apples were picked

• D) The time of picking apples

Why did the farmer probably begin picking apples in September?

• J) That is when most people go to the market

• K) That is when the apples were becoming ripe

• L) That is when the weather is best for picking

• M) That is when the apples are most expensive

Why were the apples picked on September 4 probably sour?

• A) They weren't ripe yet

• B) They were a poor variety

• C) They were damaged on the way to the market

• D) They were cheaper than the other apples

Why is the condition of the apples probably important to the farmer?

• It is easier to pick apples in good condition.

• It is easier to carry apples in good condition.

• Apples in good condition will sell better.

• Apples in good condition make better pies.

Why did the color of the apples change?

• They came from different seeds.

• They came from bigger trees.

• They were a different variety.

• They were getting riper.

Which group of apples was probably liked most by the customers at the market?

• September 4

• September 11

• September 18

• September 25