1
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
If n1, n2 and n3 are the fundamental frequencies of three segments into which a string is divided, then the original fundamental frequency n of the string is given by
A
$${1 \over n} = {1 \over {{n_1}}} + {1 \over {{n_2}}} + {1 \over {{n_3}}}$$
B
$${1 \over {\sqrt n }} = {1 \over {\sqrt {{n_1}} }} + {1 \over {\sqrt {{n_2}} }} + {1 \over {\sqrt {{n_3}} }}$$
C
$$\sqrt n = \sqrt {{n_1}} + \sqrt {{n_2}} + \sqrt {{n_3}} $$
D
n $$=$$ n1 + n2 + n3
2
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
A speeding motorcyclist sees traffic jam ahead him. He slows down to 36 km hour$$-$$1. He finds that traffic has eased and a car moving ahead of him at 18 km hour$$-$$1 is honking at a frequency of 1392 Hz. If the speed of sound is 343 m s$$-$$1, the frequency of the honk as heard by him will be
A
1332 Hz
B
1372 Hz
C
1412 Hz
D
1454 Hz
3
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
The number of possible natural oscillations of air column in a pipe closed at one end length 85 cm whose frequencies lie below 1250 Hz are (Velocity of sound = 340 m s$$-$$1)
A
4
B
5
C
7
D
6
4
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
The length of the wire between two ends of a sonometer is 100 cm. What should be the positions of two bridges below the wire so that the three segments of the wire have their fundamental frequencies in the ratio 1 : 3 : 5.
A
$${{1500} \over {23}}cm,{{500} \over {23}}cm$$
B
$${{1500} \over {23}}cm,$$ $${{300} \over {23}}cm$$
C
$${{300} \over {23}}cm,{{1500} \over {23}}cm$$
D
$${{1500} \over {23}}cm,{{2000} \over {23}}cm$$
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