(Short/V. Short Answer Questions-1, 2 Marks) 1. What features of e.m. waves lead Maxwell to conclude that light itself is electromagnetic wave ? Answer 2. For an electromagnetic wave, write the relationship between amplitude of electric and magnetic field in free space. Answer 3. State tour properties or electromagnetic waves. Answer 4. Why sky waves cannot be used in television broadcasting ? Answer 5. What is the cut off frequency beyond which the ionosphere does not reflect electromagnetic radiations ? Answer 6. Give a diagram for which it is clear that "taller the antenna, longer the coverage of the
Very Short Answer Type Question Q. 1. An electron is not deflected which moving through a certain region of space. Can you be sure that there is no magnetic field in the region ? Answer : Q. 2. An electron is moving along X-axis in a magnetic field acting along Y-axis. What is the direction of magnetic field acting on it ? Answer : Q. 3. What is the value of permeability of free space ? Answer : Q. 4. What is the direction of force between two parallel conductors carrying current in (i) same direction ; (ii) opposite direction ? Answer
[Short/V- Short Answer Questions-1, 2 Marks Each] 1. A vertical magnetic needle falls down through plane of magnetic meridian. Will any e.m.f. be produced between its ends ? Give reasons for your answer. Answer 2. Sketch a graph showing the variation of reactance of a capacitor with frequency of applied voltage. Answer 3. A small magnet is pivoted to move freely in the magnetic meridian. At what place on the earth's surface will magnet be vertical ? Answer 4. A choke coil and a bulb are connected in series to a D.C. source. The bulb shines brightly. How does
Short Answer Type Questions Q. 1. Name the nine plantes. Answer Q. 2. What is 1 AU ? Answer Q. 3. How were the crators caused on the surface of moon ? Answer Q. 4. What is albedo of a planet ? Answer Q. 5. State Hubble's law. Answer Q. 6. What is order of mass of Sun ? Answer Q. 7. What is Milky Way ? Answer Q. 8. How is brightness of star represented ? Answer Q. 9. What is the value of Solar Constant ? Answer Q. 10.
Very Short Answer Type Questions Q. 1. What are electromagnetic waves ? Answer Q. 2. How does the relation c = 1/√µ0 €0 indicate that the velocity of all types of em waves in free space is the same? Answer Q. 3. What is a plane polarised e.m. wave? Answer Q. 4. What is Maxwell's modification of Ampere's circuital law? Answer Q. 5. What is displacement current? Answer Q. 6.
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