CBSE Physics Set- I Solved Question Paper 2012, given here.
Q.1 Two wires of equal length, one of copper and the other of manganin have the same resistance. Which wire is thicker?
Ans.1 From the relation Resistance = (resistivity x length)/area R and l are constant Therefore area ∝ resistivity As manganin has higher resistivity, wire of manganin will be thicker.
Q.2 What are the directions of electric and magnetic field vectors relative to each other and relative to the direction of propagation of electromagnetic waves ?
Ans.2 Electric and magnetic field vectors are perpendicular to each other and are perpendicular to the direction of propagation of electromagnetic waves.
Q.3 How does the angular separation between fringes in single-slit diffraction experiment change when the distance of separation between the slit and screen is doubled ?
Ans.3 The separation is not the function of distance between the slit and screen. It would not change.
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