Ques:Q: Which temperature scale is commonly used in science? Read this paragraph and choose the correct option from the provided answers: one degree Fahrenheit. Only 100 Celsius degrees span the same range as 180 Fahrenheit degrees, thus one degree on the Celsius scale is 1.8 times larger than one degree on the Fahrenheit scale 180 / 100 = 9 / 5. The Kelvin scale is the temperature scale that is commonly used in science. It is an absolute temperature scale defined to have 0 K at the lowest possible temperature, called absolute zero. The official temperature unit on this scale is the kelvin, which is abbreviated K, and is not accompanied by a degree sign. The freezing and boiling points of water are 273.15 K and 373.15 K, respectively. Thus, the magnitude of temperature differences is the same in units of kelvins and degrees Celsius. Unlike other temperature scales, the Kelvin scale is an absolute scale. It is used extensively in scientific work because a number of physical quantities, such as the volume of an ideal gas, are directly related to absolute temperature. The kelvin is the SI unit used in scientific work. Choices: - ph scale - celsius - centigrade - kelvin scale A:

Ans:kelvin scale
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Ques:Q: When you are walking on a sidewalk, what occurs between your shoes and the concrete each time you put down your foot? Read this paragraph and choose the correct option from the provided answers: Static friction acts on objects when they are resting on a surface. For example, if you are walking on a sidewalk, there is static friction between your shoes and the concrete each time you put down your foot (see Figure below ). Without this static friction, your feet would slip out from under you, making it difficult to walk. Static friction also allows you to sit in a chair without sliding to the floor. Can you think of other examples of static friction?. Choices: - movement - progress - grip - static friction A:

Ans:static friction
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Ques:Q: What can happen spontaneously or as a result of mutagens in the environment? Read this paragraph and choose the correct option from the provided answers: Many mutations are not caused by errors in replication. Mutations can happen spontaneously, and they can be caused by mutagens in the environment. Some chemicals, such as those found in tobacco smoke, can be mutagens. Sometimes mutagens can also cause cancer. Tobacco smoke, for example, is often linked to lung cancer. Choices: - lesions - combustion - traits - mutations A:

Ans:mutations
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Ques:Q: What do you call the movement of molecules across a membrane without the input of energy? Read this paragraph and choose the correct option from the provided answers: Recall that the cell membrane is semipermeable. It does not allow everything to pass through. Some molecules can pass easily through your cell membranes, while others have more difficulty. Sometimes molecules need the help of special transport proteins to move across the cell membrane. Some molecules even need an input of energy to help get them across the cell membrane. The movement of molecules across a membrane without the input of energy is known as passive transport . When energy (ATP) is needed, the movement is known as active transport . Active transport moves molecules against their concentration gradient, from an area of low concentration to an area of high concentration. Choices: - obvious transport - reactive transport - active transport - passive transport A:

Ans:
passive transport
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