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Draw the energy band diagram of p-n junction diode in forward and reverse bias condition .
Concept: Fermi Level Diagram for P-N Junction
Mobility of electron and hole in a sample of Ge at room temperature are 0.36 m2 /V-sec and 0.17m2 /V-sec respectively. If electron and holes densities are equal and it is 2.5 ×1013 /cm3 , calculate its conductivity.
Concept: Conductivity, mobility, current density (drift & diffusion) in semiconductors(n type and p type)
State the Hall effect. Derive the expression for Hall voltage and Hall coefficient with neat diagram.
Concept: Hall Effect
What is photovoltaic effect? Explain the principle and working of solar cell.
Concept: Applications of semiconductors : Rectifier diode, LED, Zener diode, Photo diode, Photovoltaic cell, BJT, FET, SCR., MOSFET
“Superconductor is a perfect diamagnetic”, Explain.
Concept: Meissner Effect
What is reverberation time? How it is important ? write the factors affecting reverberation time.
Concept: Reflection of Sound(Reverberation and Echo)
A hall of dimension 25×18×12m3 has an average absorption coefficient 0.2. find the reverberation time. If a curtain cloth of area 150m2 is suspended at the centre of Hall with coefficient of absorption 0.75, What will be the reverberation
time?
Concept: Reflection of Sound(Reverberation and Echo)
State the piezoelectric effect. With neat circuit diagram explain the principle and working of piezoelectric oscillator .
Concept: Piezoelectric Oscillator
Explain food chain.
Concept: Overview of Food Chain
Explain various modes needed for public awareness to protect earth from environmental degradation.
Concept: Need for Public Awareness of Environmental Education
Explain need and importance of Environmental studies?
Concept: Definition, Scope and Importance of Environmental Study
Explain the classification of ecosystem.
Concept: Ecosystem
Discuss the case study of cloudburst and landslide at kedarnath.
Concept: Global Crisis Related to – Population, Water, Sanitation and Land
What is meant by E-pollution?
Concept: Definition, Sources and Effects of E-Pollution
Explain causes and effects of ozone layer depletion.
Concept: Sources of Air Pollution
Discuss various indoor air pollutants.
Concept: Sources of Air Pollution
Discuss the case study of ‘London smog’.
Concept: Consequences of Air Pollution > Photochemical Smog
Outline the important features of environmental clearance and authorisation mechanism?
Concept: Environmental Clearance, Consent and Authorization Mechanism
Write important functions and powers of State Pollution Control Board.
Concept: Functions and Powers of Central and State Pollution Control Board
Differentiate between conventional and non-conventional energy .
Concept: Importance of Renewable Sources of Energy
