RRB Group D 24-Sep-2018 Shift 1 Solved Paper

Rats play games by producing ultrasound. Rats produce ultrasound and communicate with each other in squeaks, clicks, and whines that we cannot hear. Humans can hear sounds from about 16 to $20,000\mathit{H}\mathit{z}$ $\left(20\mathit{k}\mathit{H}\mathit{z}\right)$ and the range of the rat's hearing is around $200\mathit{H}\mathit{z}$ to 80 or $90\mathit{k}\mathit{H}\mathit{z}$.