27. Concentrated solar: A. Collects energy using mirrors to beat water B. Is muc

Question

27. Concentrated solar: A. Collects energy using mirrors to beat water B. Is much cheaper than other forms of solar energy C. Is a concept that has never been implemented D. Collects energy using the photoelectric efect E. Cannot easily store heat and it is difficult to supplement this energy source at night. 28. Nuclear Magnetic Resonance Imaging (NMRI) usesto form images of the body A. nuclear beta decay B. gamma rays C. high-energy x rays D. magnetic fields and radiowaves E. low-energy x-rays 29. Which of the following is/are evidence of global warming? A. Recent mild winters B. None of the other options are Correct C. All of the other options (exclading Nose of the others) are Correct D. Decreased rainforest area E. Recent violent storms 30, while water cools from 10 "C down towards zero C. It- A. stays the same volume B. can either expand or contract, depending on the initial volume C. expands D. contracts, then expands E. contracts 31. Which of the following imaging methods uses gamma rays? A. X-ray scattering B. None of these C. PET (Positron Emission Tomography) D. MRI (Magnetic Resonance Imaging) E. CT (computed tomography) 32. Which of the following waves are involved in carrying away heat from objects at room temperature? A. Red Visible Light B. Ultra Violet waves C. Infrared waves D. Blue Vissble Light E. X-Rays 33. Nuclear fuel below critical mass will not sustain a chain reaction because: A. The fuel won't emit neutrons B. The neutrons escape C. It doesn't have enough nuclear energy D. It is not hot enough E. It blows itself apart

Explanation / Answer

27) A ( usually  mirrors or lenses to concentrate a large area of sunlight and heat up water for steam terbine)

28) D

29) C

30)D ( we know the density of water is maximum at 4^o C i.e at that temperature volume of the water is minimun , then below 4 degree density decreases slowly an volume increases again.)

31)B

32) C

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