Science Week 1

Which one of the elements below is a nonmetal?

• lithium

• magnesium

• krypton

• tungsten

Its chemical formula is CH_4.

_{Which choice below names this colorless, odorless greenhouse gas that is the primary component of marsh gas?}

• carbon dioxide

• methane

• radon

• nitrous oxide

Three of the following changes are physical changes. Which one is an example of chemical change?

• mixing sand and water

• dry ice sublimating

• shredding a piece of paper

• wood burning into ash

The block and tackle is a compound machine that uses multiple examples of which simple machine below?

• screw

• pulley

• inclined plane

• wedge

Which of the following choices names the SI unit of work?

• joule

• hertz

• pascal

• newton

Which of Newton's laws of motion is sometimes called the "action-reaction" law?

• first

• second

• third

• fourth

He patented a system for electricity distribution in the 1880s. Which of the following men made the incandescent electric light bulb a commercial and practical success?

• Nikola Tesla

• Alexander Graham Bell

• Alessandro Volta

• Thomas Edison

It is equivalent to one coulomb per second. Which choice below is the SI unit of electrical current?

• volt

• ampere

• ohm

• watt

Below are four parts of a nerve cell. Which one is a long, tubelike fiber that conducts impulses away from the cell body?

• nucleus

• soma

• axon

• dendrite

It contains its own DNA. Which of the following organelles has inner and outer membranes and produces much of the energy a cell needs to function?

• mitochodrion

• vacuole

• lysosome

• ribosome