Answer the following question given this paragraph: Besides entertaining a cat, laser light has many other uses. It is used to scan bar codes, for example, and to carry communication signals in optical fibers. Optical fibers are extremely thin glass tubes that are used to guide laser light (see Figure below ). Sounds or pictures are encoded in pulses of laser light, which are then sent through an optical fiber. All of the light reflects off the inside of the fiber, so none of it escapes. As a result, the signal remains strong even over long distances. More than one signal can travel through an optic fiber at the same time, as you can see in Figure below . Optical fibers are used to carry telephone, cable TV, and Internet signals. Q: What do optical fibres look like? Choices: - square boxes - big flashlights - flat paper - thin glass tubes A:
thin glass tubes
(Question)
Answer the following question given this paragraph: Waves are characterized by their repetitive motion. Imagine a toy boat riding the waves in a wave pool. As the water wave passes under the boat, it moves up and down in a regular and repeated fashion. While the wave travels horizontally, the boat only travels vertically up and down. The Figure below shows two examples of waves. Q: What kind of motion characterizes waves? Choices: - round - breathing - bending - repetitive A:
(Answer)
repetitive
Ques: Answer the following question given this paragraph: Abiotic factors are the nonliving aspects of the environment. They include factors such as sunlight, soil, temperature, and water. Q: What are the nonliving aspects of the environment called? Choices: - metastatic factors - nucleic factors - antibiotic factors - abiotic factors A:
Ans: abiotic factors
(Q).
Answer the following question given this paragraph: Sexual reproduction happens when a sperm and an egg cell combine together. This is called fertilization . Sperm are released into the vagina during sexual intercourse. They "swim" through the uterus and enter a fallopian tube . This is where fertilization normally takes place. Q: What happens when a sperm and an egg cell combine? Choices: - migration - manipulation - stimulation - fertilization A:
(A).
fertilization
Ques:Answer the following question given this paragraph: Volume is a measure of the amount of space that a substance or an object takes up. The basic SI unit for volume is the cubic meter (m 3 ), but smaller volumes may be measured in cm 3 , and liquids may be measured in liters (L) or milliliters (mL). How the volume of matter is measured depends on its state. Q: What is a measure of the amount of space that a substance or an object occupies? Choices: - mass - density - power - volume A:

Ans:volume
Answer the following question given this paragraph: Q: Resemblance to other species can serve as protection to what category of species? Choices: - producer - predator - consumer - prey A:
prey