Applied physics/Basic Electronics/Electronics BS Physics 1 Semester/Term University Of Sargodha (UOS) 2024

University of Sargodha

BS 1* Term Examination 2024

Subject: C.S /LT

Paper: Applied Physics/ Basic Electronics (PHYS-101/ PHY-2210)

Maximum Marks: 60

Time Allowed: 02:30 Hours

Note: Objective part is compulsory, Attempt any four questions from subjective part.

Objective Part

(Compulsory)

Q.1.

Write short answers of the following in 2-3 lines each on your answer sheet.

(2*12)

i. What is, anglog modulation and state various techniques'

Give Advantages of PIN photodiodes

BrEak the op-amp comparator should be chosen to get higher speed of operation?

What does Iceo, the subscript "CEO" means?

In a NAN silicon transitor, e0.95, 1-10 and lenk curren: co-. Su. Determine 1 cra

vi.

In a B/T, the collector current is 12 mA and freiier current is 1.02 times the collector current. Find

the base current.

VIL.

Define the different operating regionS Insistor.

vill.

What is meant by diffusion capacitance?

Ix

Derive the ripple factor of full wave rectifier.

x.

What is meant by drift current?

Xi.

Define magnetic reluctance

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xii.

Two capacitors of capacitance C, - 6 a F and C2 * 3 j Fare connected in series across a cell of emf

18 V. Calculate the charge on each capacitor.

Subjective Part

(4*9)

Q.2.

a) What is difference between active and passive components? Give some examples of these

components.

b) State three quantities which are used to establish ohm's law for magnetic circuits

c) Find the voltage across each capacitor

0.3.

a) What is meant by isolated atom, draw the energy levels of an isolated atom.

b) Differentiate solid by using energy band diagram.

c) A silicon diode has a forward voltage drop of 1.2 V for a forward de current of 100 mA. It has a

reverse current of 1uA for the reverse voltage of 10 V. calculate. Bulk and reverse resistance of the

0.4.

a) What are different types of power supply. Draw block diagram of de power supply

b) What is rectifier? Discuss the working of center tapped transformer full wave rectifier and calculate

its average value.

c) For a silicon diode, the reverse saturation current at room temperature (T - 300 K) is found to be

100 nA. What should be diode current when the applied voltage is

(a) 0.2 V

(b) 0.8 V?

a) What is voltage multiplier? Discuss the working of half-wave voltage doubler.

O Persistor circuit configuration and determine the relation between a and B.

supply of 230 V is applied to a half-wave rectifier circuit through a transformer of tum ratio

Uctade.l. Find (0) the output d.c. voltage and (li) the peak inverse voltage. Assume the diode to be ideal.

4) What is meant by leakage current in a transf? How these can be classified. Show that

b) What is difference between intrinsis

a) What is difference between Modulation and De-modulation. State different types of pilation.

b) An audio signal given by 15sin2z(2000)c amplitude-modulates a sinusua

sine wave

6Osin2m( 100,000). determine modulation index, percent modulation, frequencillot signal and carrier,

channel width

c) What is solut cell? Discuss the working of solar cell.

- LK-6025/26-04-24-.

CS

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