SSC JE Electrical Engineering 2011 Paper

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Question : 65 of 150

Marks: +1, -0

Dogs are used for detective work by the police because they

can hear ultrasonic waves of frequency upto 50,000 Hz
can hear infrasonic waves
can hear ultrasonic waves of frequency upto 1,20,000 Hz
can hear sound waves of frequency in the range 20 Hz to 20,000 Hz

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