PhD Science EOM

A group of science students question whether the temperature of a liquid affects its pH.. Which of the following steps should the students take first as they attempt to research this question?

• Design an experiment

• Create a theory

• Form a Hypothesis

• Make Observations

In an attempt to identify an unknown rock same, a student applies dilute hydrocholoric acid to test the reactivity of the rock. Which of the following safety precautions is it most important for the student to follow this procedure?

• Putting eye protection prior to carrying out the procedure

• Pulverizing the rock sample prior to testing it

• Using a fume hood to trap gases given off during the test

• Conducting the procedure wearing latex gloves

Light from the sun traveling at approximately 2.9x10^8 m/s takes about 4.6x10^2 seconds to reach earth. Based on this information, which of the following best represents the distance the light travels from the sun to Earth?

• 1.3 x 10^11m

• 2.9 x 10^10m

• 3.6 x 10^9m

• 6.3 x 10^5m

Tags

NGSS.HS-PS4-1

In a scientific paper, an entormologist uses the formula shown below to describe a population of insects. Which of the following terms best describes this formula. E/N?

• Mean

• Mode

• Median

• Range

Tags

NGSS.HS-LS3-3

NGSS.HS-LS4-3

The Bohr model of the atom combined the earlier atomic model of Ernest Rutherford with a model derived from which of the following theories?

• General Theory of Relativity

• Unified Field Theory

• String Theory

• Quantum Theory

Tags

NGSS.HS-PS4-3

The concept of entropy refers to which of the following characteristics of a closed system?

• Tendency of a system to become more disordered over time

• Self-Regulation of a system through feedback mechanisms

• Maintenance of balance among separate system components

• Emergent properties resulting from interaction of system components

Tags

NGSS.HS-PS3-4

A geoscientist using seismology to determine where the transition between two different Earth layers occurs applies which of the following concepts from physics in analyzing the seismic data?

• Second law of thermodynamics

• Snall's law of refraction

• Heisenberg uncertainty principle

• Bernoullis Principle

Tags

NGSS.HS-ESS2-1

To model the general circulation of Earth's atmosphere, scientists rely on mathematical formulas from which of the following areas of study?

• Physics

• Computer Science

• Geochemistry

• Environmental Engineering

Although nuclear power is an energy resource that does not produce carbon emissionss, many people are still concerned about expanding the number of nuclear power plants in use in the United States. The primary concern is that the production of nuclear power...

• Requires large amounts of freshwater for cooling systems

• Generates hazardous waste that has to be stored for thousands of years.

• Depends on a nonrenewable mineral resource that will eventually run out

• Creates hazardous work environment for employees

Tags

NGSS.HS-ESS3-4

NGSS.HS-ETS1-3

Weather forecasting has changed dramatically over the past century. Today, surface weather observations, as well as data from satellites, provide information for computer models to process into simulations. Which of the following is demonstrated by this example?

• Major advances in scientific knowledge depend on the development of new technologies

• The practice of science is closely tied to available technologies and societal needs

• The accomplishments of science in today's world are more highly valued than in the past

• The expansion of scientific literacy is essential to the development of a democratic society

Tags

NGSS.HS-ETS1-4