Physics Form Four Focus Series Exam – Iringa Girls Sec PDF

Posted by Dastan Anastaz April 18, 2026

Physics Form Four Focus Series Exam – Iringa Girls Sec PDF

Download Physics Form Four Focus Series Exam – Iringa Girls’ Secondary for free.

PHYSICS 1 FORM FOUR FOCUS SERIES 01 EXAMINATION – IRINGA GIRLS’ SECONDARY SCHOOL

SECTION C (30 Marks)
Answer two (2) questions from this section

9. (a) In a closed pipe, the first resonance is at 23 cm and second at 73 cm. Determine the wavelength of the sound and the end correction of the pipe. (5 Marks)
(b) Explain why it is not advisable for soldiers to march across a bridge in rhythm. (4 Marks)
(c) String A is 2 m long and has a linear mass density of 9 g cm−1. String B has a linear mass density of 18 g cm−1. If the tension in both strings is the same, how long must string B be for it to be at resonance with string A? (6 Marks)

10. (a) How does the size of a gap in a barrier affect the diffraction of waves? (3 Marks)
(b) (i) State two ways in which visible light differs from radio waves. (4 Marks)
(ii) List two applications of gamma rays. (4 Marks)
(c) What is the wavelength of a wave whose speed is 4 m s−1 and frequency is 2 Hz? (4 Marks)

11. Two persons stand facing each other, 200 m apart on one side of a high wall and at the same perpendicular distance to it. When one fires a pistol the other hears a report 0.60 s after the flash and a second 0.25 s after the first. Explain this and calculate:
(a) The velocity of sound in air. (5 Marks)
(b) The perpendicular distance of the persons from the wall. (5 Marks)
(c) Draw a diagram showing the positions of the persons and the wall. (5 Marks)

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