Ques: Q: Visible light is the narrow segment of what, to which the normal human eye responds? Read this paragraph and choose the correct option from the provided answers: Visible Light Visible light is the narrow segment of the electromagnetic spectrum to which the normal human eye responds. Visible light is produced by vibrations and rotations of atoms and molecules, as well as by electronic transitions within atoms and molecules. The receivers or detectors of light largely utilize electronic transitions. We say the atoms and molecules are excited when they absorb and relax when they emit through electronic transitions. Figure 24.16 shows this part of the spectrum, together with the colors associated with particular pure wavelengths. We usually refer to visible light as having wavelengths of between 400 nm and 750 nm. (The retina of the eye actually responds to the lowest ultraviolet frequencies, but these do not normally reach the retina because they are absorbed by the cornea and lens of the eye. ) Red light has the lowest frequencies and longest wavelengths, while violet has the highest frequencies and shortest wavelengths. Blackbody radiation from the Sun peaks in the visible part of the spectrum but is more intense in the red than in the violet, making the Sun yellowish in appearance. Choices: - molecular spectrum - radio spectrum - phenomena spectrum - electromagnetic spectrum A:
Ans: electromagnetic spectrum

Ques: Q: "endocrine" and "exocrine" are two types of what? Read this paragraph and choose the correct option from the provided answers: The ductless endocrine glands are not to be confused with the body's exocrine system, whose glands release their secretions through ducts. Examples of exocrine glands include the sebaceous and sweat glands of the skin. As just noted, the pancreas also has an exocrine function: most of its cells secrete pancreatic juice through the pancreatic and accessory ducts to the lumen of the small intestine. Choices: - organs - fluids - cells - glands A:
Ans: glands

Ques: Q: What is categorized by the forces holding the individual atoms, ions, or molecules together? Read this paragraph and choose the correct option from the provided answers: Solids can be categorized by the forces holding the individual atoms, ions, or molecules together. The Table below summarizes the properties of different solids:. Choices: - gases - liquids - oils - solids A:
Ans: solids

Ques: Q: In the scientific method, what is the initial, unproven explanation for why something is occurring? Read this paragraph and choose the correct option from the provided answers: The scientific method is not a step by step, linear process. It is a way of learning about the world through the application of knowledge. Scientists must be able to have an idea of what the answer to an investigation should be. In order for scientists to make educated guesses about the answers, they will base their guesses on previous knowledge, with the notion of extending that knowledge. Scientists will often make an observation and then form a hypothesis to explain why a phenomenon occurred. They use all of their knowledge and a bit of imagination in their journey of discovery. Choices: - concepts - idea - theories - hypothesis A:
Ans:
hypothesis