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Posted By: Girish Patil Member Level: Diamond Posted Date: 04 Mar 2008
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2007 CBSE Applied Science II Question paper
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Applied Science II
June 2005 (Revised Course)
Section I
N.B. (1) Question No. 1 is compulsory.
(2) Answer any four questions from remaining six questions.
(3) Assume suitable data whenever required.
(4) Figures to the right indicate full marks.
(5) Illustrate your answer with sketches wherever necessary.
1. (a) Show, with clear examples, that separation between two consecutive'similar rings, in
Newton's Rings Experiment, goes on reducing as the serial number of ring increases.
5
(b) In Newton's Rings experiment, the nth dark ring due to light.of wavelength
coincides with (n+2)th dark ring due to light of wavelength Show that radius on nth
dark
ring is given by
2. (a) Explain diffraction due to a single slit. Arrive at conditions for
maxima and minima.Take as wavelength of incident monochromatic light. 5
b) Calculate the highest order of spectrum that can be obtained by a monochromatic light
of wavelength 6000 A0 by a grating of 6000 lines per centimeter. 5
3. (a) Explain with neat sketch optical fiber communication link. 5
(b) Internal critical angle in core at core-cladding interface of a step index optical fiber is 80.6°.
Calculate maximum acceptance angle if refractive index of cladding is 1.48. 5
4. (a) Explain construction and working of HeNe laser with neat energy level diagram. 5
(b) Find how many photons are required to produce laser beam of 3 mW power,
if wavelength of the same is 6943 A0. 5
5. (a) Differentiate between continuous X-rays and characteristic X-rays. 5
(b) Explain Moseley's law and its significance. 5
6. (a) Describe various parts of a nuclear reactor and their functions. 5
b) Explain the term "binding energy per nucleon." Find binding energy per nucleon of 3Li7,
if mass of proton = 1.0081437 amu, mass of neutron = 1.0089830 only and
mass of 3Li7 = 7.016005 amu. 5
7. Write notes on any two : 10
(a) Antireflection films (2) Coolidge Tube (3) Holography.
Section ll
N.B. (1) Question No. 1 is compulsory.
(2) Answer any four questions fronvremaining six questions.
(3) Figures to right indicate full marks.
1. (a) Give the applications (any 4) of Biotechnology in agriculture. 10
(b) What is the role of ash in coal ?
(c)- Give the characteristics of good quality paint ? (any 4)
(d) What is metal cladding ?
(e) Give composition and properties of Duralumin.
(f) Select the compound which has the highest octane No. and highest cetane No. out of
n-heptane, n-hexadecgne, n-octane, iso-octane.
2. (a) What is power alcohol ? How is it obtained from molasses ? 5
(b) 2.9 gm of coal was heated in electric oven at 110CC. The weight of sample gets reduced to
2.75 gm. Further heating at 925°C for 7 min. in muffle furnace, with lid, reduces the wt. of
sample to 2.45 gm. This sample on heating at 750CC, for 1/2 hr., gives residue of 0.13 gm.
Calculate % C.
3. (a) Why galvanisation of articles is preferred to tinning ? 4
(b) A gas has following composition by volume : 6
CH4 = 40%. C2H6 = 20%, C3H8 = 10%, H2 = 10%, CO = 10%, N2 = 10%. Calculate weight
of air required per m3 of gas. (Mol wt q air = 28.94)
4. (a) What is the effect of following elements on alloying steel-: (any two) 4
(i) Cobalt (ii) Tungsten (iii) Nickel
(b) Explain differential aeration corrosion with example. - 6
5. (a) How are the following factors responsible for rate of corrosion : (any three) 6
(i) Relative areas of Anode and Cathode (ii) PH (iii) Overvoltage
(iv) Nature of surface film.
(b) Give well labelled diagram of Bio-gas with calorific value and composition. 4
6. (a) What .is cracking and Explain Moving Bed Catalytic Cracking. 6
(b) Give an. account of alloys of lead and tin. 4
7. (a) What do you mean by impressed current cathodic protection ? 4
(b) Explain octane rating and role of antiknock agents in Gasoline. 6
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