Punjab State Board of Technical Education and Industrial Training 2011-2nd Sem Diploma Computer Engineering APPLIED PHYSICS Common to All Trades of in Engineering. - Question Paper

APPLIED PHYSICS

second Exam/Common/2154/May'11
Duration: 3Hrs. M.Marks: 75

SECTION-A

Q.1.(A) Fill in the blanks: [Marks 5]

(a) The ratio of the size of the image to the size of the object is called .......... .
(b) The unit of capacitance is ………………………….. .
(c) Unit of conductance is …………………………. .
(d) Tesla is the unit of …………………………….. .
(e) An extremely pure semiconductor is called …………………….. semiconductor.

(B) State actual or False: [Marks 5]
(a) Convex lens is thin at the middle and thick at the edge.
(b) The value of 4µ?o in MKS system is 1.
(c) The time rate of flow of charge is called electrical current.
(d) Susceptibility is small and positive for paramagnetic materials.
(e) The conductivity of semiconductor is zero at absolute zero.

(C) select the accurate one: [Marks 5]
(1) The optically denser medium is 1 which has
(a) higher refractive index (b) higher density
(c) lower refractive index (d) lower density

(2) A body can be negative charged by
(a) giving excess of electrons to it (b) removing a few electrons from it
(c) giving a few electrons to it (d) removing a few electrons from it

(3) 4 resistances are connected in parallel. The resulting resistance R is
(a) equal to a few of all the resistance
(b) greater then sum of all resistance
(c) less than a few of all resistance
(d) less than any of 4 resistace

(4) The force experienced by a charge q moving with velocity V vector in a magnetic field B vector is givem by
(a) F?=q(V? X B?) (b) F?=q(B? X V?)
(c) F?=(V? X B?) (d) F?=-q(V? X B?)

(5) A ruby laser is
(a) 2 level laser (b) 3 level laser
(c) 4 level laser (d) 5 level laser

SECTION-B

Note: Attempt any 5 questions: [Marks five X 6]

Q.2. (1) A lense is formed by combining 2 thin lenses of powers + 12D and -8D in contact with every other. What will be the focal length of combination?

(2) describe the terms pole, principle axis, principle focus and focal length for a spherical mirror.

(3) 106 electrons are added to a body, obtain the total charge on the body.

(4) State and prove Gauss Theorem.

(5) obtain the equivalent resistance when 3 resistances are connected in series.

(6) Show how will you change a galvanometer into an ammeter.

(7) various ranging from intrinsic and extrinsic semiconductors.

(8) provide a few properties of laser light.

SECTION-C
Note: Attempt any 3 questions: [Marks three X 10]

Q.3. discuss the phenomenon of interference from the principle of superpositioning and specify the conditions under which interference can take place.

Q.4. State and prove Coulomb's legal regulations in electrostatics.

Q.5. (a) A current of 20 A flows throw a circuit consisting of 2,4,5 and 20 ohm resistances respectively in parallel. Determine the current in every branch.
(b) Force ranging from 2 parallel current carrying conductors in f1. If the current in every conductor is doubled, obtain the force ranging from them.

Q.6. (a) Deference ranging from N-type and P-type semiconductors.
(b) What is He-Ne laser ? discuss with diagram.

Earning:   Approval pending.