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Subjective Question
In a resonance tube experiment, a tuning fork of frequency 480 Hz resonates in the fundamental mode, with an air column of length 16 cm in a tube closed at one end. Find the diameter of the tube. Given, the speed of sound in air = 336 ms^-1.

Chemistry

Multiple-Choice Question
The bond dissociation enthalpy C-X in CH₃X (where X is halogen) follows the order

(a)	CH₃ - Cl > CH₃ - Br > CH₃ - I	(b)	CH₃ - Cl < CH₃ - Br < CH₃- I
(c)	CH₃ - Cl > CH₃ - Br < CH₃- I	(d)	CH₃ - Cl < CH₃ - Br > CH₃ - I

Mathematics

Multiple Answer Question
For non-coplanar vectors A, B and C, |(A x B) . C| = |A| |B| |C| holds if and only if
(a) A . B = B . C = C . A = 0
(b) A . B = 0 = B . C
(c) A . B = 0 = C . A
(d) B . C = 0 = C . A

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