Explore topic-wise MCQs in Physics Questions and Answers.

This section includes 3 Mcqs, each offering curated multiple-choice questions to sharpen your Physics Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.

1.

A man jumps from a building with a source of sound. When he reaches halfway down, he starts the siren of frequency 100Hz. A person standing below him on the ground hears the first sound to be of frequency 120Hz. What is the height of the building? Speed of sound = 330m/s. Take g=9.81m/s2.

A. 154m
B. 308m
C. 77m
D. 500m
Answer» C. 77m
Discussion
2.

A source of frequency 50Hz is moving towards an observer with a deceleration of 2m/s2. If its initial speed is 20m/s, what will be the maximum frequency heard by the observer? Initial distance between source and observer is 100m. Speed of sound = 330m/s.

A. 47.14Hz
B. 0
C. 53.22Hz
D. 53.03Hz
Answer» D. 53.03Hz
Discussion
3.

A train with a frequency ‘f’. What will be the frequency heard by a person sitting in the train? Speed of the train is ‘v’.

A. f
B. f(330+v)/330
C. fv/(330-v)
D. fv/(330+v)
Answer» B. f(330+v)/330
Discussion