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Bats can sense obstacles because they produce
(1) Supersonic sound waves
(2) Ultrasonic sound waves
(3) Infrasonic sound waves
(4) Micro sound waves

(2) Ultrasonic sound waves

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The first Indian ruler who accepted Subsidiary Alliance offered by Lord Wellesley in 1798 was (1) Nawab of Oudh (2) Nizam of Hyderabad (3) Nawab of Carnatic (4) King of Mysore	Which of these is a modified underground stem (1) Radish (2) Carrot (3) Sweet potato (4) Potato