Ques:Q: An electrical motor changes electrical energy into what? Read this paragraph and choose the correct option from the provided answers: Electrical motors change electrical energy into mechanical energy. The motor consists of an electrical circuit with part of the wires inside a magnetic field. This can be seen below. Positive charges move through the circuit in the direction of the light purple arrows. When the charges move up through the part of the coil that is right next to the north pole, the right hand rule tells us that the wire suffers the force, F , pushing the wire in the direction of the blue arrow, toward the back of the sketch. On the other side of the coil, where the charges are moving down through the field, the right hand rule shows the force would push this side of the coil toward the front. These two forces are working together, rotating the coil in the direction of the circular red arrow. Choices: - chemical energy - solar energy - thermal energy - mechanical energy A:

Ans:mechanical energy
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Ques:Q: Which form of digestion is a purely physical process that does not change the chemical nature of the food? Read this paragraph and choose the correct option from the provided answers: Digestion includes both mechanical and chemical processes. Mechanical digestion is a purely physical process that does not change the chemical nature of the food. Instead, it makes the food smaller to increase both surface area and mobility. It includes mastication, or chewing, as well as tongue movements that help break food into smaller bits and mix food with. Choices: - slow - simple - electromagnetic - mechanical A:

Ans:mechanical
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Ques:Q: How does the liquid in a thermometer respond to heat or cold? Read this paragraph and choose the correct option from the provided answers: Many thermometers measure temperature with a liquid that expands when it gets warmer and contracts when it gets cooler. Look at the common household thermometer pictured in the Figure below . The red liquid rises or falls in the glass tube as the temperature changes. Temperature is read off the scale at the height of the liquid in the tube. To learn more about measuring temperature, watch the animation "Measuring Temperature" at this URL: http://www. sciencehelpdesk. com/unit/science2/3. Choices: - freezes or boils - disappears - rises or vaporizes - expands or contracts A:

Ans:expands or contracts
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Ques:Q: A penguin must do what before molting? Read this paragraph and choose the correct option from the provided answers: Choices: - hibernate - use muscle mass - mate - increase muscle mass A:

Ans:
increase muscle mass
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