1451Every Day ScienceMedium
Which one of the following elements the drum of a Photostat machine is made up of: _________?
A
MCQs
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Correct answer
A. Selenium
Explanation
The photoreceptor drum in the heart of the system is basically a metal roller covered by a layer of photoconductive material. This layer is made out of a semiconductor such as selenium, germanium or silicon.
Correct answer
A. Fruits
Explanation
The term is derived from the Latin words poma and logus. Poma means ‘fruit’ and logus means ‘study, knowledge or discourse’. It can be defined as a branch of horticulture, that deals with the scientific study of fruit crops. A pomologist studies and cultivates fruit. Pomologists with advanced degrees are often found in universities and in the horticulture industry in research, teaching, and extension positions, developing, breeding, and evaluating new varieties of fruits and nuts.
Correct answer
A. Diffusion
Explanation
If someone is cooking in the kitchen, the smell travels around the house to other rooms. This is because of diffusion , the movement of particles from an area of high concentration to an area of low concentration.
Correct answer
D. 576
Explanation
Find out how well a human eye compares to a cell phone camera. According to scientist and photographer Dr. Roger Clark, the resolution of the human eye is 576 megapixels.
Correct answer
B. 88 days
Explanation
88 days is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
Correct answer
C. Skeletal muscles
Explanation
Skeletal muscles is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
Correct answer
D. Reverse Osmosis
Explanation
Reverse osmosis is a water purification process that uses a partially permeable membrane to remove ions, unwanted molecules and larger particles from drinking water.
Correct answer
E. Infrared Rays
Explanation
Infrared Rays is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
Correct answer
C. Fruit Juices
Explanation
Fruit Juices is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
Correct answer
C. Frost shattering
Explanation
Frost shattering is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.