At = 0 h, balloon contained Ne. X t ① Internal pressure of balloon X was constant throughout the above change. ② At = 1 h, balloon Y contained a mixture of gases. t ③ (A) (B) (C) (D) ① ② ①, ③ ②, ③ [ PHYSICS ] 11. Bats use ultrasonic waves to catch prey. When stationary, a bat emits ultrasonic waves of frequency 82.5 kHz. The bat now starts following a moth along the +x direction. The speeds of the bat and moth are 9.00 m/s and 8.00 m/s, respectively. The bat now emits and detects the wave reflected by the moth. The velocity of sound is 340 m/s. Which of the following is the closest frequency for the detected wave by the bat? (A) 82.7 kHz (B) 82.8 kHz (C) 82.9 kHz (D) 83.0 kHz 12. A ball of mass 1.0 kg is projected with a velocity of 10 m/s horizontally from the edge of a building at a height of 20 m. While falling, the ball splits into two identical pieces, X and Y without external forces. Then, X and Y hit the ground simultaneously at a point 10 m and R horizontally from the building, respectively. Consider the gravitational acceleration to be 10 m/s2 . What is the distance (Assume there is no air resistance.) R? (A) 20 m (B) 30 m (C) 40 m (D) 50 m 13. A ball X with mass travels on a frictionless track, as shown in the figure below. After barely m
① At t = 0 h, balloon X contained Ne. ② Internal pressure of balloon X was constant throughout the above change. ③ At t = 1 h, balloon Y contained a mixture of gases. (A) ① (B) ② (C) ①, ③ (D) ②, ③ [ PHYSICS ] 11. Bats use ultrasonic waves to catch prey. When stationary, a bat emits ultrasonic waves of frequency 82.5 kHz. The bat now starts following a moth along the +x direction. The speeds of the bat and moth are 9.00 m/s and 8.00 m/s, respectively. The bat now emits and detects the wave reflected by the moth. The velocity of sound is 340 m/s. Which of the following is the closest frequency for the detected wave by the bat? (A) 82.7 kHz (B) 82.8 kHz (C) 82.9 kHz (D) 83.0 kHz 12. A ball of mass 1.0 kg is projected with a velocity of 10 m/s horizontally from the edge of a building at a height of 20 m. While falling, the ball splits into two identical pieces, X and Y without external forces. Then, X and Y hit the ground simultaneously at a point 10 m and R horizontally from the building, respectively. Consider the gravitational acceleration to be 10 m/s2 . What is the distance R? (Assume there is no air resistance.) (A) 20 m (B) 30 m (C) 40 m (D) 50 m 13. A ball X with mass m travels on a frictionless track, as shown in the figure below. After barely
Multiple_Choice_Exam_Sheet_Final.docx