HIGHER SECONDARY EXAM, 2008
Physics (New Syllabus)
(English version)
Group-A
1. Give answer to the following questions either in one word or in one sentence (alternatives are to be noted): 1x10=10
(a)What is the condition for destructive interference of two monochromatic coherent beams of light? 1
OR, Fill in the blanks:
For a source of sound approaching a stationary observer, the frequency of sound source ----------.
(b)At the ends of an organ pipe open at both ends, what do we get always — nodes or antinodes? 1
(c)What is the net electric force on an electric dipole placed in a uniform electric field? 1
(d)Fill in the blank: 1 e.s.u. of potential = --------- volts . 1
OR State whether the statement is true of false:
"The direction of electrostatic field intensity at a point on the surface of a charged conductor is along the tangent drawn on the
surface at that point."
(e)The north pole of a magnet is brought near a static conductor charged negatively. Will the pole experience any force? 1
OR, Will a moving charge experience any force in a magnetic field?
(f)Write down the name of the physical quantity whose unit is joule (coulomb) 1.
(g) What kind of charge is the majority carrier in a p-type semiconductor? 1
(h) What is threshold frequency in photo electric effect? 1
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