BSc Physics Past Papers of Electronics (Paper C , Section-I)

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B.Sc. Physics Past Papers of Electronics (Paper C , Section-I) University of Sargodha

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B.Sc. Mechanics (Physics) (In accordance with syllabus of UNIVERSITY OF THE PUNJAB AND UNIVERSITY OF SARGODHA)

B.Sc. Waves and Oscillations (In accordance with syllabus of UNIVERSITY OF THE PUNJAB AND UNIVERSITY OF SARGODHA)

B.Sc. Thermodynamics (In accordance with syllabus of UNIVERSITY OF THE PUNJAB AND UNIVERSITY OF SARGODHA)

B.Sc. Electricity and Magnetism (In accordance with syllabus of UNIVERSITY OF THE PUNJAB AND UNIVERSITY OF SARGODHA)

B.Sc. Electronics (In accordance with syllabus of UNIVERSITY OF THE PUNJAB AND UNIVERSITY OF SARGODHA)

B.Sc. Modern Physics (In accordance with syllabus of UNIVERSITY OF THE PUNJAB AND UNIVERSITY OF SARGODHA)

B.Sc. 1^st Annual Exam 2015

Q # 1. (a). What is transistor? Explain pnp-transistor in common-emitter configuration used as amplifier. Also calculate its gain.

(b). In common emitter amplifier, calculate collector current  and , when  and .

(c). What are the differences between hole and positive charge.

Q # 2. (a). What is pn-junction? Define depletion region, barrier potential and describe its forward and reverse biased characteristics.

(b). What is the speed of a conduction electron in copper with K.E. equal to its Fermi energy 7 eV.

(c). Identify following as p-type or n-type semiconductors:

(i)      Al in Ge

(ii)    In in Ge

(iii)  Sb in Is

(iv)   P in Si

Q # 3. (a). What are logic gates? Describe:

(i)      XNOR gate

(ii)    NAND gate

(b). A LED is constructed from pn-junction based on GaAsP semiconductor material whose energy gap is 1.97 eV. What is the wavelength of emitted light and color?

(c). Differentiate among analog and digital quantities.

B.Sc. 1^st Annual Exam 2014

Q # 1. (a). Distinguish between a conductor, an insulator and semiconductor using concept of energy bands.

(b). Calculate maximum wavelength that will produce photoconduction in diamond which have band gap of 5.5 eV.

(c). Define rectification. Give its types.

Q # 2. (a). What is load line? Define operating point and why it is selected at midway of the load line in case of amplification?

(b). Explain the action of transistor as an amplifier.

(c). Does pure semiconductor obeys Ohm’s Law?

Q # 3. (a). Discuss the two inputs NAND logic gate giving their symbolic form and truth table.

(b). Derive the relation  and  ,  and .

(c). Name the minority charge carriers in an N-type and P-type semiconductors.

B.Sc. 1^st Annual Exam 2013

Q # 1. (a). What is pn-junction? Define depletion region and potential barrier. Describe forward and reverse characteristics of pn-junction diode.

(b). A LED is constructed from pn-junction based on certain semiconductor whose energy gap is 1.9 eV. What is the wavelength of its emitted light?

(c). Distinguish between drift and Fermi speed of conduction electrons in metal.

Q # 2. (a). What is transistor? Describe the characteristics for common-emitter configuration.

(b). The current flowing into the base of transistor is , find its collector current  and emitter current  and the ration   if .

(c). How does motion of electron in N-type substance differ from the motion of hole in P-type substance?

Q # 3. (a). What is an oscillator? Explain RL phase shift oscillator?

(b). What is load line? Define quiescent point.

(c). Define positive and negative feedback.

B.Sc. 1^st Annual Exam 2012

Q # 1. (a). Describe qualitatively the formation of energy bands in solids and their classification into metal, semiconductors and insulators.

(b). Calculate the maximum wavelength that will produce photoconduction in diamond which has a band gap of 5.5 eV.

(c). Do pure semiconductors obey Ohm’s Law?

Q # 2. (a). Explain the circuit of Common Emitter Amplifier.

(b). How does positive Feedback to an amplifier leads to sustain oscillations?

(c). Name the minority carries in N-type and P-type semiconductors.

Q # 3. (a). Discuss the two input AND logic gate giving their symbolic form and truth table.

(b). Describe the basic circuit for a bistable multivibrator.

(c). Does a slab of N-type material carry a net negative charge?

Students of B.Sc. Physics must and STUDY following PDF Books

B.Sc. Mechanics (Physics)

CLICK HERE TO FREE PDF BOOK B.Sc. Mechanics(Physics)

B.Sc. Waves and Oscillations

CLICK HERE TO FREE PDF BOOK B.Sc. Waves andOscillations

B.Sc. Thermodynamics

CLICK HERE TO FREE PDF BOOK B.Sc. Thermodynamics

B.Sc. Electricity and Magnetism

CLICK HERE TO FREE PDF BOOK B.Sc. Electricity and Magnetism

B.Sc. Electronics

CLICK HERE TO FREE PDF BOOK B.Sc. Electronics

B.Sc. Modern Physics

CLICK HERE TO FREE PDF BOOK B.Sc. Modern Physics