1
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
Change Language
A string is stretched between fixed points separated by 75.0 cm. It is observed to have resonant frequencies of 420 Hz and 315 Hz. There are no other resonant frequencies between these two. The lowest resonant frequency for this string is
A
10.5 Hz
B
105 Hz
C
155 Hz
D
205 Hz
2
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
Change Language
The fundamental frequency of a closed organ pipe of length 20 cm is equal to the second overtone of an organ pipe open at both the ends. The length of organ pipe open at both the ends is
A
120 cm
B
140 cm
C
80 cm
D
100 cm
3
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
Change Language
A parallel plate air capacitor has capacity C, distance of separation between plates is d and potential difference $$V$$ is applied between the plates. Force of attraction between the plates of the parallel plate air capacitor is
A
$${{C{V^2}} \over d}$$
B
$${{{C^2}{V^2}} \over {2{d^2}}}$$
C
$${{{C^2}{V^2}} \over {2d}}$$
D
$${{C{V^2}} \over {2d}}$$
4
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
Change Language
If potential (in volts) in a region is expressed as V(x, y, z) = 6xy $$-$$ y + 2yz, the electric field (in N/C) at point (1, 1, 0) is
A
$$ - \left( {2\widehat i + 3\widehat j + \widehat k} \right)$$
B
$$ - \left( {6\widehat i + 9\widehat j + \widehat k} \right)$$
C
$$ - \left( {3\widehat i + 5\widehat j + 3\widehat k} \right)$$
D
$$ - \left( {6\widehat i + 5\widehat j + 2\widehat k} \right)$$
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