1
AIPMT 2004
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
A car is moving towards a high cliff. The driver sounds a horn of frequency $$f$$. The reflected sound heard by the driver has frequency $$2f$$. If v is the velocity of sound, then the velocity of the car, in the same velocity units, will be
A
v/$$\sqrt 2 $$
B
v/3
C
v/4
D
v/2
2
AIPMT 2004
MCQ (Single Correct Answer)
+4
-1
The phase difference between two waves. represented by
y1 = 10$$-$$6 sin[100t + (x/50) + 0.5] m
y2 = 10$$-$$6 cos[100t + (x/50)] m,
where x is expressed in metres and t is exressed in secondss, is approximately.
A
1.07 radians
B
2.07 radians
C
0.5 radians
D
1.5 radians
3
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
An observer moves towards a stationary source of sound with a speed 1/5th of the speed of sound. The wavelength and frequency of the source emitted are $$\lambda $$ and $$f$$ respectively. The apparent frequency and wavelength recorded by the observer are respectively
A
1.2 $$f$$,   1.2 $$\lambda $$
B
1.2 $$f$$,  $$\lambda $$
C
$$f$$,  1.2 $$\lambda $$
D
0.8 $$f$$,   0.8 $$\lambda $$
4
AIPMT 2002
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
A whistle revolves in a circle with angular speed $$\omega $$ = 20 rad/s using a string of length 50 cm. If the frequency of sound from the whistle is 385 Hz, then what is the minimum frequency heard by an observer which is far away from the centre (velocity of sound $$=$$ 340 m/s)
A
385 Hz
B
374 Hz
C
394 Hz
D
333 Hz.
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