1
NEET 2017
MCQ (Single Correct Answer)
+4
-1
A spring of force constant k is cut into lengths of ratio 1 : 2 : 3. They are connected in series and the new force constant is K'. Then they are connected in parallel and force constant is k''. Then k' : k'' is
A
1 : 9
B
1 : 11
C
1 : 14
D
1 : 6
2
NEET 2017
MCQ (Single Correct Answer)
+4
-1
A particle executes linear simple harmonic motion with an amplitude of 3 cm. When the particle is at 2 cm from the mean position, the magnitude of its velocity is equal to that of its acceleration. Then its time period in second is
A
$${{\sqrt 5 } \over {2\pi }}$$
B
$${{4\pi } \over {\sqrt 5 }}$$
C
$${{2\pi } \over {\sqrt 3 }}$$
D
$${{\sqrt 5 } \over \pi }$$
3
NEET 2017
MCQ (Single Correct Answer)
+4
-1
The two nearest harmonics of a tube closed at one end and open at other end are 220 Hz and 260 Hz. What is the fundamental frequency of the system ?
A
20 Hz
B
30 Hz
C
40 Hz
D
10 Hz
4
NEET 2017
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Two cars moving in opposite directions approach each other with speed of 22 m s$$-$$1 and 16.5 m s$$-$$1 respectively. The driver of the first car blows a horn having a frequency 400 Hz. The frequency heard by the driver of the second car is (velocity of sound is 340 m s$$-$$1)
A
361 Hz
B
411 Hz
C
448 Hz
D
350 Hz
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