Gujarat State Technical Examinations Board 2008-1st Sem Diploma Electrical Engineering (DEE) in electrical subject-APPLED SCEINCE (PHYSICS) - Question Paper

JUNE/JULY-2008
1. ans any ten of the following:
(1) provide S.I units foe (a) force (b) momentum.
(2) describe meter OR ampere in S.I system.
(3) describe (a) cohesive force (b) adhesive force.
(4) write 2 uses of surface tension.
(5) describe (1)wave length (b) amplitude
(6) what is the difference ranging from achoo and reverberation
(7) state the formula for magnifying power of simple microscope.
(8) discuss sphere of influence and molecular range.
(9) describe half life and derive formula for it.
(11) write full name of LASER?
(12) discuss fluorescent phenomena r.
(13) the refractive index of glass is 1.5 if the velocity of light in air is 3*100000000 m/s what will be its velocity in glass?
(14) write our application of X-rays.

2.(a) ans any 3 of the subsequent.
(1) draw a neat sketch of linear calipers and o discuss its use.
(2) explain a method to determine surface tension of water.
(3) state the characteristics of a good auditorium.
(4) state and discuss laws of refraction of light .
(5) describe reverberation provide formula for reverberation time and discuss the term used in it.
(b) compute (ANY TWO)
(1) compute lowest count of a micrometer screw gauge having pitch mm and circular scale division 50.
(2) water riser up to 3.6 cm in a capillary tube of diameter 0.4 mm immersed vertically in water.how far will it rise in a tube of diameter 0.3 mm.?
(3) an object is placed at a distance of 75 cm from a convex lens of local length 50 cm.calculate the image distance for it.


3.(a) ans any THREE.
(1) distinguish ranging from X-ray and B-rays giving 2 points.
(2) provide the 3 uses of X-rays.
(3) write short note on phosphorescence.
(4) provide 3 application of LASER.
(5) write short note on nuclear reactor.
(b) compute ANY TWO:
(1) compute the energy of a photon in mev having wave length 4.5*(-10000000000000) m.
(2) avg. life of a radio active element is 2000 years.calculate its half life period.
(3) quantity of an auditorium is 5000 m3 and its reverberation time is 5 five second.calculate total absorption of all the surface of auditorium.

Earning:   Approval pending.