Ques: Q: The first law of thermodynamics deals with the total amount of energy in what? Read this paragraph and choose the correct option from the provided answers: Only radioactive isotopes have half-lives. Choices: - organism - springs - galaxy - universe A:
Ans: universe

Ques: Q: What layered form of carbon is used as a lubricant and in pencils? Read this paragraph and choose the correct option from the provided answers: Graphite is a form of carbon in which carbon atoms are arranged in layers. Bonds are strong between carbon atoms within each layer but relatively weak between atoms in different layers. The weak bonds between layers allow the layers to slide over one another. This makes graphite relatively soft and slippery. It is used as a lubricant. It also makes up the "lead" in pencils. Choices: - carbonite - copper - lead - graphite A:
Ans: graphite

Ques: Q: Tar sands are rocky materials mixed with what? Read this paragraph and choose the correct option from the provided answers: Tar sands are rocky materials mixed with very thick oil. The tar is too thick to pump, and so tar sands are strip-mined. Hot water and caustic soda are used to separate the oil from the rock. This creates a slurry, which is shaken. The oil floats to the top and is skimmed off. Choices: - shale - coal - magma - very thick oil A:
Ans: very thick oil

Ques: Q: What is the type of energy that involves movement? Read this paragraph and choose the correct option from the provided answers: All of the examples of potential energy described above involve movement or the potential to move. The form of energy that involves movement is called mechanical energy. Other forms of energy also involve potential energy, including chemical energy and nuclear energy. Chemical energy is stored in the bonds between the atoms of compounds. For example, food and batteries both contain chemical energy. Nuclear energy is stored in the nuclei of atoms because of the strong forces that hold the nucleus together. Nuclei of radioactive elements such as uranium are unstable, so they break apart and release the stored energy. Choices: - molecular energy - thermal energy - light energy - mechanical energy A:
Ans:
mechanical energy