1
NEET 2013
MCQ (Single Correct Answer)
+4
-1
If we study the vibration of a pipe open at both ends. then the following statement is not true.
A
All harmonics of the fundamental frequency will be generated.
B
Pressure change will be maximum at both ends.
C
Open end will be antinode.
D
Odd harmonics of the fundamental frequency will be generated.
2
NEET 2013
MCQ (Single Correct Answer)
+4
-1
A wave travelling in the + ve x-direction having displacement along y-direction as 1 m, wavelength 2$$\pi $$ m and frequency of $${1 \over \pi }$$ Hz is represented by
A
y = sin(10$$\pi $$x $$-$$ 20$$\pi $$t)
B
y = sin(2$$\pi $$x + 2$$\pi $$t)
C
y = sin(x $$-$$ 2t)
D
y $$=$$ sin(2$$\pi $$x $$-$$ 2$$\pi $$t)
3
NEET 2013
MCQ (Single Correct Answer)
+4
-1
A source of unknown frequency gives 4 beats/s when sounded with a source of known frquency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second, when sounded with a source of frequency 513 Hz. The unknown frequency is
A
240 Hz
B
260 Hz
C
254 Hz
D
246 Hz
4
NEET 2013
MCQ (Single Correct Answer)
+4
-1
Two pith balls carrying equal charges are suspended from a common point by strings of equal length, the equilibrium separation between them is r. Now the strings are rigidly clamped at half the height. The equilibrium separation between the balls now become

NEET 2013 Physics - Electrostatics Question 58 English
A
$$\left( {{{2r} \over {\sqrt 3 }}} \right)$$
B
$$\left( {{{2r} \over 3}} \right)$$
C
$${\left( {{1 \over {\sqrt 2 }}} \right)^2}$$
D
$$\left( {{r \over {\root 3 \of 2 }}} \right)$$
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