Description : Which one of the following is responsible for the working of Newton’s colour disc experiment ? (1) Formation of pure spectra (2) Formation of impure spectra (3) Persistence of vision (4) Principle of complementary colour
Last Answer : Persistence of vision
Description : A student uses a force of 45 Newtons to push a chair at a constant speed of 3m/s for a time of 6 seconds how much work did the student do?
Last Answer : W = F*dd = 3m/s * 6s = 18mW = 45N18m = 810Nm
Description : For reproducing sound, a CD (Compact Disc) audio player uses a 1) quartz crystal 2) titanium needle 3) laser beam 4) barium titanium ceramic
Last Answer : 3) laser beam
Description : Axial flow thresher uses a) Raspbar type cylinder b) Serrated disc type c) Spike tooth d) Hammer mill
Last Answer : a) Raspbar type cylinder
Description : Axial flow thresher uses a) Raspbar type cylinder b) Serrated disc type cylinder c) Spike tooth d) Hammer mill
Description : Electric resistance seam welding uses __________ electrodes. (A) Pointed (B) Disc. (C) Flat (D) Domed
Last Answer : Ans: B Disc type electrodes are used for electric resistance seam welding.
Description : DVD technology uses an optical media to store the digital data DVD is an acronym for (A) Digital Vector Disc (B) Digital Volume Disc (C) Digital Versatile Disc (D) Digital Visualization Disc
Last Answer : (C) Digital Versatile Disc