1
WB JEE 2008
MCQ (Single Correct Answer)
+1
-0.25

A hollow cylinder with both sides open generates a frequency f in air. When the cylinder vertically immersed into water by half its length the frequency will be

A
f
B
2f
C
f/2
D
f/4
2
WB JEE 2008
MCQ (Single Correct Answer)
+1
-0.25

Two stretched strings have lengths l and 2l while tensions are T and 4T respectively. If they are made of same material the ratio of their frequency is

A
2 : 1
B
1 : 2
C
1 : 1
D
1 : 4
3
WB JEE 2008
MCQ (Single Correct Answer)
+1
-0.25

When sound is produced in an aeroplane with a velocity of 200 m/s horizontally its echo is heard after $$10\sqrt 5 $$ seconds. If velocity of sound in air is 300 ms$$-$$1 the elevation of aircraft is

A
250 m
B
$$250\sqrt 5 $$ m
C
1250 m
D
2500 m
4
WB JEE 2008
MCQ (Single Correct Answer)
+1
-0.25

Two turning forks of frequencies n1 and n2 produces n beats per second. If n2 and n are known, n1 may be given by

A
$${{{n_2}} \over n} + {n_2}$$
B
$${n_2}n$$
C
$${n_2}\, \pm \,n$$
D
$${{{n_2}} \over n} - {n_2}$$
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