2021 SJI Physics Prelim Year 4 P1

ST JOSEPH’S INSTITUTION PRELIMINARY EXAMINATION 2021 (YEAR 4) CANDIDATE NAME CLASS INDEX NUMBER PHYSICS Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 6091/1 27 AUGUST 2021 1 hour (10:30 – 11:30) READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue, or correction fluid. Write your name, class and index number in the multiple choice answer sheet. There are forty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate Multiple Choice Answer Sheet. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done on this question paper. The use of an approved scientific calculator is expected, where appropriate. This document consists of 18 printed pages including this cover page.

2 distance / mtime / s0 Going up At maximum height Coming down A -10 m/s2 0 m/s2 +10 m/s2 B -10 m/s2 -10 m/s2 -10 m/s2 C +10 m/s2 +10 m/s2 +10 m/s2 D +10 m/s2 0 m/s2 -10 m/s2 1 Which combination of lengths gives the smallest rectangular area? A 1.0 Gm x 1.0 mm B 1.0 km x 1.0 cm C 1.0 Mm x 1.0 nm D 1.0 μm x 1.0 m 2 A ball is thrown vertically upwards, where it stops momentarily at the maximum height, before falling vertically down. Taking downwards as the positive direction, and ignoring the effects of air resistance, which of the following states its acceleration of its motion? 3 The diagram shows the distance-time graph of a moving object. Which of the following describes this moving object? A It is a ball thrown vertically upwards and falling back to the thrower. B It is a car that starts from rest and speeds up as it moves away from a traffic signal. C It is a rock that is dropped from a high cliff and falling into the sea below.  D It is a train slowing down and coming to a stop at a train station. 4 A gymnast of mass 60 kg lands on a trampoline. If he rebounds upwards with an acceleration of 0.60 m/s2, what is the maximum force exerted by the trampoline on the gymnast? A 36 N B 564 N C 636 N D 672 N

3 5 A parachutist jumps off a plane. After 1.0 min, he opens the parachute and his velocity decreases at a decreasing rate. The following statements are possible explanations why the velocity of the parachutist decreases at a decreasing rate. (I) The velocity decreases as such the air resistance acting on the parachute decreases. (II) The tension exerting on the parachutist decreases. (III) The force of the parachute acting on the air increases. Which of the above statements is/are correct?