Answer the following question given this paragraph: Another type of luminescence is called electroluminescence. In this process, a substance gives off light when an electric current passes through it. Gases such as neon, argon, and krypton produce light by this means. The car dash lights in the Figure below are produced by electroluminescence. Q: Gases such as neon, argon, and krypton produce what using electroluminescence? Choices: - heat - colors - electricity - light A:
light
(Question)
Answer the following question given this paragraph: Carbon dioxide chemically weathers rock by creating acids. Q: How does carbon dioxide chemically weather rocks? Choices: - by creating proteins - by creating water - by creating heat - by creating acids A:
(Answer)
by creating acids
Ques: Answer the following question given this paragraph: A lever is a simple machine consisting of a bar that rotates around a fixed point. The fixed point of a lever is called the fulcrum. Like other machines, a lever makes work easier by changing the force applied to the machine or the distance over which the force is applied. For a video introduction to levers using skateboards as examples, go to this URL:. Q: What do you call the fixed point of a lever? Choices: - base - caliper - apex - fulcrum A:
Ans: fulcrum
(Q).
Answer the following question given this paragraph: Centrioles are rod-like structures made of short microtubules. Nine groups of three microtubules make up each centriole. Two perpendicular centrioles make up the centrosome . Centrioles are very important in cellular division, where they arrange the mitotic spindles that pull the chromosome apart during mitosis. Q: What are the rod-like structures made of short microtubules that play an important part in cellular division? Choices: - cilia - mitochondria - fibrils - centrioles A:
(A).
centrioles
Ques:Answer the following question given this paragraph: Particles that are composed of three quarks are called baryons . The two best known baryons are protons and neutrons. A proton is composed of two up quarks and one down quark (uud). The charge on the proton is the result of adding the charges on these quarks . Neutrons are composed of one up quark and two down quarks (udd). The charge on the neutron is the result of adding the charges on these quarks . Q: What are the two best known baryons? Choices: - flux and neurons - electrons and neutrons - shafts and neutrons - protons and neutrons A:

Ans:protons and neutrons
Answer the following question given this paragraph: energy is released when particles in the nucleus of the atom are rearranged. (e) Chemical energy results from the particular arrangement of atoms in a chemical compound; the heat and light produced in this reaction are due to energy released during the breaking and reforming of chemical bonds. Electrical energy, nuclear energy, and chemical energy are different forms ofpotential energy (PE), which is energy stored in an object because of the relative positions or orientations of its components. A brick lying on the windowsill of a 10th-floor office has a great deal of potential energy, but until its position changes by falling, the energy is contained. In contrast, kinetic energy (KE) is energy due to the motionof an object. When the brick falls, its potential energy is transformed to kinetic energy, which is then transferred to the object on the ground that it strikes. Q: Chemical energy results from the particular arrangement of atoms in a chemical compound; the heat and light produced in this reaction are due to energy released during the breaking and reforming of what? Choices: - acid bonds - atom bonds - carbon bonds - chemical bonds A:
chemical bonds