41. PVTs are not efficient in
A. creating electricity.
B. cooling silicon solar cells.
C. generating heat.
D. powering solar thermal collectors.
42. One of the problems PVTs have is that
A. their thermal applications are costly.
B. they are too expensive to afford.
C. they occupy too much space.
D. it is hard to fix them on the roof.
43. Which of the following is NOT mentioned as an advantage of thin-film silicon solar cells?
A. They are electrically efficient.
B. They are less expensive.
C. They are flexible.
D. They are environment friendly.
44. Thin-film solar panels do not sell well on market because
A. their advantages are not well-recognized.
B. they do not work well if exposed to light.
C. they need improving in appearance.
D. they are not advertised.
45 Which of the following statements is true?
A. Thin-film silicons electrical efficiency improves when heated up.
B. New techniques have been developed to produce thin-film silicon.
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