Many people ride a bicycle for fun and exercise. Some people ride a bicycle to work because it saves money and benefits the environment by reducing the use of fossil fuels.

Which of these is not an example of the bicycle using mechanical energy?

A teacher gives a student four clear sealed containers. Each container holds a different substance. The student records some observations about the substance in each container.

Based on these observations, which container most likely holds only gas?

A group of students built the circuit shown below. 

The lightbulb does not glow. Which statement explains this observation?

Some students investigate the properties of four objects using a hand lens, a magnet, and a beaker containing water. Their observations are recorded in the table.

Which statement identifies a property that could be used to classify these objects into two different groups?

A student studies two Texas maps that showed some high temperatures for two days in October 2012.

How many degrees Celsius did the high temperature increase in the city that had the greatest change in high temperature? Be sure to use the correct place value.

Many types of fans are used in homes. One type of electric fan is shown below.

In addition to mechanical energy, which of these is produced as electric current passes through the circuit of this fan?

A freshwater ecosystem has various food webs. One of these food webs is shown below.

Which organisms transfer the most energy within the food web?

Some students examined two samples of pond water with a hand lens over three days. Each day they compared what they saw with pictures of samples their teacher had labeled. Their observations are listed below.

Based on their observations, the students concluded that mosquitoes undergo complete metamorphosis while dragonflies undergo incomplete metamorphosis. Which of these explains why the students’ conclusion is correct?

A simplified diagram of a system using solar energy is shown.

To recharge the battery for later use without lighting the bulb, which of the following switches should be closed?

A scientist was studying a type of event that occurred on Earth in various places within a 30-day period. The circles indicate where the events happened.

The events being studied involved rapid changes to Earth’s surface at the locations shown on the map. What type of event do the circles on the map most likely represent?

A student designs an experiment to test the effect of the width of a piece of elastic on the elastic’s ability to stretch. The student selects four pieces of elastic with different widths but the same length. The student then attaches blocks with different masses to the pieces of elastic. The results of the student’s experiment are shown below.

What should the student do to improve this experiment?

In 1859, Henry Bursill published a book of hand shadows. The picture below shows one of these hand shadows.

Which property of light makes it possible to produce hand shadows?

A group of students made the observations listed below about the size, shape, and appearance of their hands.

Which of the students’ observations describe inherited traits?

Four students stand facing a box. The diagram below shows an overhead view of the box. The numbered circles represent the positions of the students.

What do the students need to do to slide the box to the northeast?