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A series LCR circuit is connected across an a.c. source of variable angular frequency 'ω'. Plot a graph showing variation of current 'i' as a function of 'ω' for two resistances R1 and R2 (R1 > R2).
Answer the following questions using this graph :
(a) In which case is the resonance sharper and why?
(b) In which case in the power dissipation more and why?
Concept: Different Types of AC Circuits: AC Voltage Applied to a Series LCR Circuit
Draw a labelled ray diagram showing the formation of a final image by a compound microscope at least distance of distinct vision
Concept: Optical Instruments >> Simple Microscope or a Reading Glass
State two points of difference between the interference patterns obtained in Young’s double slit experiment and the diffraction pattern due to a single slit.
Concept: Diffraction of Light >> The Single Slit
Write Einstein's photoelectric equation and mention which important features in photoelectric effect can be explained with the help of this equation.
The maximum kinetic energy of the photoelectrons gets doubled when the wavelength of light incident on the surface changes from λ1 to λ2. Derive the expressions for the threshold wavelength λ0 and work function for the metal surface.
Concept: Einstein’s Equation - Particle Nature of Light
Answer the following question.
Show that the density of the nucleus is independent of its mass number A.
Concept: Size of the Nucleus
How is a Zener diode fabricated?
Concept: Special Purpose P-n Junction Diodes
Describe, with the help of a circuit diagram, the working of Zener diode as a voltage regulator.
Concept: Zener Diode as a Voltage Regulator
Write the two processes that take place in the formation of a p-n junction.
Concept: p-n Junction
Write the property of a junction diode which makes it suitable for rectification of ac voltages.
Concept: Semiconductor Diode
What is the function of a 'Repeater' used in communication system?
Concept: Basic Terminology Used in Electronic Communication Systems
In the midst of severe competition and many conflicts in 1989, a consensus appeared to have emerged among most parties. Explain any three points of consensus.
Concept: Political Conflicts Overlanguage
Describe the structure of a seminiferous tubule.
Concept: The Male Reproductive System
Briefly describe the process of spermatogenesis.
Concept: Gametogenesis
Mention any three characteristics of Neanderthal man that lived in near east and central Asia.
Concept: Human Evolution
Explain adaptive radiation with the help of a suitable example.
Concept: Adaptive Radiation
What are methanogens?
Concept: Microbes in Production of Biogas
Describe how do 'flocs' and 'activated sludge' help in Sewage Treatment.
Concept: Microbes in Sewage Treatment
Why are baculoviruses considered good biocontrol agents?
Concept: Microbes as Biocontrol Agents
Suggest two advantages to a farmer for using apomictic seeds of hybrid varieties.
Concept: Strategies for Enhancement in Food Production (Questions)
Identify the type of pyramid given above. Write the identifying feature on the basis of which you identified it.
Concept: Population >> Population Attributes
