1
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
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
2
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
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
$${{C{V^2}} \over {2d}}$$
3
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
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
$$ - \left( {6\widehat i + 5\widehat j + 2\widehat k} \right)$$
4
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
Two metal wires of identical dimensions are connected in series. If $$\sigma $$1 and $$\sigma $$2 are the conductivity of the combination is
A
$${{{\sigma _1} + {\sigma _2}} \over {{\sigma _1}{\sigma _2}}}$$
B
$${{{\sigma _1}{\sigma _2}} \over {{\sigma _1} + {\sigma _2}}}$$
C
$${{2{\sigma _1}{\sigma _2}} \over {{\sigma _1} + {\sigma _2}}}$$
D
$${{{\sigma _1} + {\sigma _2}} \over {2{\sigma _1}{\sigma _2}}}$$
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