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Show graphically an audio signal, a carrier wave and an amplitude modulated wave
Concept: Need for Modulation and Demodulation
A carrier wave of peak voltage 15 V is used to transmit a message signal. Find the peak voltage of the modulating signal in order to have a modulation index of 60%
Concept: Modulation and Its Necessity
How do you convert the following:
Aniline to phenol
Concept: Methods of Preparation of Phenols
How do you convert the Ethanal to Propanone
Concept: Alcohols, Phenols and Ethers >> Nomenclature
When concentrated sulphuric acid was added to an unknown salt present in a test tube a brown gas (A) was evolved. This gas intensified when copper turnings were added to this test tube. On cooling, the gas (A) changed into a colourless solid (B).
1) Identify (A) and (B).
2) Write the structures of (A) and (B).
3) Why does gas (A) change to solid on cooling?
Concept: Group 16 Elements - The Oxygen Family >> Sulphuric Acid
Arrange the following in the decreasing order of their reducing character :
HF, HCl, HBr, HI
Concept: Group 17 Elements - The Halogen Family
Account for the following:
pKa value of 4-nitrobenzoic acid is lower than that of benzoic acid.
Concept: Physical Properties of Carboxylic Acids
Give a simple chemical test to distinguish between Aniline and N, N-dimethylaniline
Concept: Concept of Amines >> Chemical Reactions of Amines - Carbylamine Reaction
In a potentiometer arrangement for determining the emf of a cell, the balance point of the cell in open circuit is 350 cm. When a resistance of 9 Ω is used in the external circuit of the cell, the balance point shifts to 300 cm. Determine the internal resistance of the cell.
Concept: Cells, Emf, Internal Resistance
Using the concept of free electrons in a conductor, derive the expression for the conductivity of a wire in terms of number density and relaxation time. Hence obtain the relation between current density and the applied electric field E.
Concept: Specific Resistance
Write the underlying principle of a moving coil galvanometer.
Concept: Moving Coil Galvanometer
Define mutual inductance.
Concept: Inductance >> Mutual Inductance
What do you understand by the statement, "Electromagnetic waves transport momentum"?
Concept: Electromagnetic Spectrum
Draw a diagram of the microscopic structure of human sperm. Label the following parts in it and write their functions:
- Acrosome
- Nucleus
- Middle piece
Concept: Gametogenesis
Explain the effect on the characteristics of a river when urban sewage is discharged into it.
Concept: Biodiversity
Name any two biodiversity hot spots in India.
Concept: Loss of Biodiversity
What type of azeotrope is formed by positive deviation from Raoult’s law?
Concept: Vapour Pressure of Liquid >> Vapour Pressure of Liquid- Liquid Solutions
Define the following term:
Fuel cell
Concept: Electrochemical Cells
How would you account for the following: Transition metals form complex compounds.
Concept: General Properties of the Transition Elements (d-block)
Account for the following:
E° value for the Mn3+/Mn2+ couple is much more positive than that for Cr3+/Cr2+.
Concept: General Properties of the Transition Elements (d-block)
