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Define the following term:
Ferromagnetism
Concept: Properties of Solids: Magnetic Properties
What is an encoder?
Concept: Applications of Boolean Algebra and Logic Gates to Half Adders, Full Adders, Encoders, Decoders, Multiplexers, NAND, NOR as Universal Gates
Draw the logic gate diagram for the reduced expression. Assume that the variables and their complements are available as inputs.
Concept: Elementary Logic Gates (NOT, AND, OR, NAND, NOR, XOR, XNOR) and Their Use in Circuits
As a member of the Student Council of you school, you wish to start an old clothes collection drive. These clothes are to be donate to an orphanage nearby. Write a proposal in not more than 150 words, stating the steps you would take to make it a seccess.
Concept: Writing Skills
You are the editor of your school magazine. You have recently attended a cultural program in your city. Write an account of this program (in approximately 300 words) using the points given below:
| Date and venue — occasion — Chief Guest — other invitees — inauguration — events —other important features — highlights — reaction of audience — conclusion. |
Concept: Writing Skills
Your uncle has promised to give you a gift of Rs. 1000/-. Write a letter thanking him for the offer, tell him how you plan to spend the money; and why you wish to spend it in this way.
Concept: Writing Skills
State Gauss’ Law.
Concept: Applications of Gauss' Theorem > Electric Field due to a Point Charge
Show that intensity of electric field at a point in broadside position of an electric dipole is given by:
E = `(1/(4 pi epsilon_0)) p/((r^2 + l^2)^(3//2))`
Where the terms have their usual meaning.
Concept: Electric Dipole
Arrangement of an oxygen ion and two hydrogen ions in a water molecule is shown in the figure below.
Calculate the electric dipole moment of a water molecule. Express your answer in terms of e (charge on hydrogen ions), l and θ.
Concept: Electric Dipole
Draw a labelled circuit diagram of a potentiometer to measure the internal resistance ‘r’ of a cell. Write the working formula (derivation is not required).
Concept: Potentiometer
Draw a labelled circuit diagram of a potentiometer to compare emfs of two cells. Write the working formula (Derivation not required).
Concept: Potentiometer
Calculate the shortest wavelength of electromagnetic radiation present in Balmer series of hydrogen spectrum.
Concept: Electromagnetic Spectrum
What happens when an electron collides with a positron?
Concept: Electromagnetic Spectrum
Name the principle on the basis of which optical fibres work.
Concept: Total Internal Reflection
Using Huygen’s wave theory of light, show that the angle of incidence is equal to the angle of reflection. Draw a neat and labelled diagram.
Concept: Huygens Principle
On the basis of Bohr's theory, derive an expression for the radius of the nth orbit of an electron of the hydrogen atom.
Concept: Bohr’s Model for Hydrogen Atom
Write one balanced equation to show Nuclear fission
Concept: Nuclear Fusion
Why nuclear fusion reaction is also called thermo-nuclear reaction?
Concept: Nuclear Fusion
What is ‘Pair production’?
Concept: Atomic Masses and Composition of Nucleus
Draw solar cell V-I characteristics.
Concept: Special Purpose P-n Junction Diodes
