Science Quiz Unit 3

Allie is setting up holiday lights at home. Which string of lights will stop working if one light bulb goes out?

• String A: Old-fashioned series circuit lights

• String B: Modern parallel circuit lights

• String C: LED lights with a shunt resistor

• String D: Solar-powered individual lights

During a science experiment, Porter and Jameson were observing a reaction. Which type of reaction do you think they observed based on the diagram?

• They observed fusion, because the reaction released energy

• They observed fission, because the reaction absorbed energy

• They observed fusion, because the reaction formed heavier nuclei

• They observed fission, because the reaction formed lighter nuclei

Jameson and Ada are studying nuclear physics and they come across a term 'alpha particle'. Which of the following best describes an alpha particle that they are studying?

• A negatively charged particle, consisting of a neutron, that is emitted from an atom undergoing radioactive decay.

• A positively charged particle, consisting of two protons and two neutrons, that is emitted from an atom undergoing radioactive decay.

• An atom that results from the radioactive decay of another atom.

• Radioactive energy, not matter, that is emitted during radioactive decay.

Jackson is building an electromagnet for a school science project. Which of the following would increase the strength of the magnetic field produced by Jackson's electromagnet?

• Doubling the number of times the wire wraps around the nail.

• Changing the battery to a 3.0V battery.

• Reversing the direction of the current flow.

• Replacing the iron nail with one made of plastic.

Jameson, a geologist, is studying a sample of uranium-235. He knows that the half-life of uranium-235 is 700 million years. In his study, he found that the original sample had 1000 g of uranium-235. He wants to know what would happen after 2100 million years have passed. Can you help Jameson? Select all that apply.

• 125 g of the original sample remains.

• One half-life has passed.

• Two half-lives have passed.

• 250 g of the original sample remains.

• Three half-lives have passed.

If 10 coulombs of charge passes a given point in a conductor every 2 seconds, what is the current at that point, in amps?

If the current in a wire is 2.0 amperes and the potential difference across the wire is 10. volts, what is the resistance of the wire, to the nearest tenth of an ohm?

Ashton and Emily were working on a science project where they built a simple circuit with two resistors (R₁, R₂) and a switch (S). Ashton opened the switch S and noticed that current flowed through resistor R₁ but not through resistor R₂. Which circuit did Ashton and Emily most likely build?

• HIH

• Hilt

• HILF

• Hill

During a science experiment, Emily and Jameson initiated a nuclear fusion reaction. They observed that the mass of the products was

• less than the mass of the reactants because some of the mass has been converted to energy.

• more than the mass of the reactants because some of the mass has been converted to energy.

• less than the mass of the reactants because some of the energy has been converted to mass.

• more than the mass of the reactants because some of the energy has been converted to mass.

Jameson and Ada were playing in the park when they found a magnet. They placed the magnet under a piece of paper and sprinkled iron shavings on the paper. What did they observe?

• The magnet must have magnetic fields that repel magnetic materials and push the shavings away.

• The magnet must have multiple magnetic fields that attract the shavings with different strengths.

• The magnet must have uneven magnetic fields that attract the shavings in random patterns.

• The magnet must have magnetic fields that flow from one pole of the magnet to the other.