SCGS 2022 Prelim P1

SINGAPORE CHINESE GIRLS’ SCHOOL PRELIMINARY EXAMINATION 2022 SECONDARY FOUR PHYSICS PAPER 1 Multiple Choice Monday 1 Hour Additional Materials: Multiple Choice Answer Sheet 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 on the Question Paper and Answer Sheet in the spaces provided. There are forty questions in this paper. Answer all questions. For each question, there are four possible answers, A, B, C, D. Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet. Read the instructions on the Answer Sheet very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. The use of an approved scientific calculator is expected, where appropriate. Take g = 10 ms-2 or 10 Nkg-1 unless specified otherwise. This question paper consists of 24 printed pages CANDIDATE NAME CLASS REGISTER NUMBER

2 1 A student is given a reel of wire of diameter less than 0.2 mm and is asked to find the density of the metal. Which pair of instruments would be most suitable for finding the volume of the wire? A Balance and micrometer B Metre rule and micrometer C Metre rule and vernier calipers D Micrometer and vernier calipers 2 The diameter of a solid metal sphere is measured using a micrometer screw gauge. The diagram shows an enlargement of the shaft of the micrometer screw gauge when taking the measurement. The mass of the sphere is 0.450 g. What is the density of the metal used to make the sphere? A 965 kg m–3 B 1340 kg m–3 C 7720 kg m–3 D 10 700 kg m–3 3 4 40 30 20

3 3 Paths are laid as shown between points X, Y and Z. A person walks along the paths from X to Y to Z and then back to X. What is the value of the total displacement and of the total distance travelled? total displacement / m total distance travelled / m A 0 0 B 0 30 C 30 0 D 30 30 4 Two tugs are towing an oil rig as shown The tensions in the towing cables are 4.0 kN and 5.0 kN. What is the total force acting on the rig due to the cables, in the direction to the east? A 3.1 kN B 5.2 kN C 7.0 kN D 8.3 Kn oil rig 20 ° 50 ° east tug tug 4.0 kN 5.0 kN X Y Z 5.0 m 12.0 m 13.0 m

4 5 A car accelerates uniformly from velocity u to velocity v in time t. On the graph, which area equals the distance travelled by the car in time t ? A NPTU + PQST B NPWV + VRSU C NPWV + WRST D PST + PQS 6 A raindrop falls vertically from rest in air. The variation with time of the speed of the raindrop is shown in the graph. Which statement about the raindrop is correct? A At point X, the raindrop has an acceleration of 10 m s–2. B At point Z, the force on the raindrop due to air resistance has reached its maximum value and so the acceleration of the raindrop has also reached its maximum value. C At point Z, the force due to air resistance is equal and opposite to the weight of the raindrop and so the speed of the raindrop is zero. D The resultant force on the raindrop at point Y is less than the resultant force on the raindrop at point X.

5 7 A sphere is released and falls. Its initial acceleration decreases until it eventually begins to travel at constant terminal velocity. Which displacement-time graph best represents the motion of the sphere?

6 8 The acceleration of free fall on the Moon is 1.6 m s–2. The Moon has no atmosphere. An astronaut standing on the surface of the Moon drops a feather. Which graph shows the variation with time of the speed of the feather during the first second of its fall?

7 9 A car travels along a straight horizontal road. The graph shows the variation of the velocity v of the car with time t for 6.0 s of its journey. The brakes of the car are applied from t = 1.0 s to t = 4.0 s. How far does the car travel while the brakes are applied? A 21 m B 45 m C 67 m D 83 m 10 A submarine descends vertically at constant velocity. The three forces acting on the submarine are drag, upthrust and weight as shown in the diagram below. Drag, D upthrust, U Which relationship between their magnitudes is correct? A W  D + U B W > D + U C W = D + U D W < D + U Weight, W

8 11 A U-tube containing water is used as a manometer. When one end of the manometer is connected to a low-pressure chamber, both water levels in the manometer change by 20 cm. The gravitational field strength g is 10 N / kg. The density of water is 1000 kg / m3. How far below atmospheric pressure is the pressure in this chamber? A 2000 Pa B 4000 Pa C 200000 Pa D 400000 Pa

9 12 Five blocks have the same mass but different base areas. They all rest on a horizontal table. A graph is plotted to show the relationship between the pressure exerted on the table and the base area of the block. Which graph shows this relationship? 13 The diagram shows a muscle and bones in a person’s arm. The hand holds a load of weight 40 N. The elbow acts as a pivot and the tension in the muscle keeps the lower part of the arm horizontal. What is the tension in the muscle due to the load? A 200 N B 240 N C 280 N D 1400 N

10 14 A uniform solid block has weight 500 N, width 0.4 m and height 0.6 m. The block rests on the edge of a step of depth 0.8 m, as shown. The block is knocked over the edge of the step and rotates through 90° before coming to rest with the 0.6 m edge horizontal. What is the change in gravitational potential energy of the block? A 300 J B 400 J C 450 J D 550 J 15 A student can run or walk up the stairs to her classroom. Which statement describes the power required and the gravitational potential energy gained while running up the stairs compared to walking up them? A Running provides more gravitational potential energy and uses more power. B Running provides more gravitational potential energy and uses the same power. C Running provides the same gravitational potential energy and uses more power. D Running provides the same gravitational potential energy and uses the same power 0.8 m 0.6 m 0.4 m 0.4 m