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Two monochromatic beams, one red and the other blue, have the same intensity. In which case (i) the number of photons per unit area per second is larger, (ii) the maximum kinetic energy of the photoelectrons is more? Justify your answer.
Concept: Photoelectric Effect - Hertz’s Observations
How does one explain, using de Broglie hypothesis, Bohr's second postulate of quantization of orbital angular momentum?
Concept: De Broglie’s Explanation of Bohr’s Second Postulate of Quantisation
Draw a plot of potential energy of a pair of nucleons as a function of their separations. Mark the regions where the nuclear force is (i) attractive and (ii) repulsive.
Concept: Nuclear Force
Describe the following term briefly:
Minority carrier injection in forward biasing.
Concept: Semiconductor Diode
Describe the following term briefly:
Breakdown voltage in reverse biasing
Concept: Semiconductor Diode
Write the functions of the following in communication systems:
Transmitter
Concept: Basic Terminology Used in Electronic Communication Systems
Write the functions of the following in communication systems:
Receiver
Concept: Basic Terminology Used in Electronic Communication Systems
Explain any four reasons for the dominance of the Congress Party in the first three general elections in India.
Concept: Nature of Congress Dominance at the National Level
Why did the people of China not receive the benefits of the reforms when its economy had improved dramatically? Explain giving any two reasons.
Concept: The Rise of the Chinese Economy
Highlight any two major problems faced by the Election Commission of India for holding the first General Election in 1952.
Concept: Challenge of Building Democracy
Explain India’s stand on environmental issues.
Concept: India's Stand on Environmental Issues
Analysis of any two effects of the Emergency declared in 1975 on the politics of India.
Concept: Declaration of Emergency
Explain the post-pollination events leading to seed production in angiosperms.
Concept: Pollination
List the different types of pollination depending upon the source of pollen gain.
Concept: Pollination
Why angiosperm anthers are called dithecous?
Concept: Pollination
Explain the different ways apomictic seeds can develop, Give an example of each.
Concept: Polyembryony
Mention one advantage of apomictic seeds to farmers.
Concept: Polyembryony
Draw a labelled mature stage of a dicotyledonous embryo.
Concept: Endosperm
Describe the structure of its microsporangium.
Concept: Pollination
Explain the events upto double fertilisation after the pollen tube enters one of the synergids in an ovule of an angiosperm.
Concept: Flower
