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Dibyanshu Lahiri from Mont Fort Sr Sec School, Roorkee
Subject :NSO    Class : Class 8

Four different whistles, when blown, emit pure notes with the frequencies, 0.1 kHz, 1 kHz, 10 kHz, 100 kHz.
How many of the frequencies are above the normal audible range of humans?

A1
B2
C3
D4


Ans 1:

Vartika Agarwal from Phoenix world school, Pune
Class : Class 9
kHz = 1000Hz

Ans 2:

Aryan Keswani from Delhi Public School, Mathura Road, New Delhi
Class : Class 10
Answer is A Because the question is "ABOVE THE AUDIBLE RANGE, not within"

Ans 3:

AKSHAJ SRIVASTAVA from MOUNT LITERA ZEE SCHOOL, Kanpur
Class : Class 9
how many kHz = Hz

Ans 4:

Kashish Kathuria from Delhi Public School, Bangalore
Class : Class 9
1000

Ans 5:

Vartika Agarwal from Phoenix world school, Pune
Class : Class 9
correct answer should be c

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