CGS 2025 Physics P1 MS

This paper consists of 18 printed pages including this cover page. Class: Index No.: Name: Answer Key w/ Solutions CRESCENT GIRLS’ SCHOOL SECONDARY FOUR PRELIMINARY EXAMINATION PHYSICS 6091 / 01 Paper 1 Multiple Choice 02 September 2025 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write your name, index number and class in the spaces provided at the top of this page and on the optical answer sheet. Do not use staples, paper clips, highlighters, glue or correction fluid. 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 optical 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.

2 6091/01/CGS/2025 1 What is the volume of air in a typical classroom in Crescent Girl’s School? A 8 × 100 m3 B 8 × 101 m3 C 8 × 102 m3 D 8 × 103 m3 2 Which set of quantities are all scalars? A displacement, force, work done B distance, pressure, kinetic energy C speed, weight, chemical energy D velocity, gravitational field strength, moment 3 A car travels from town A to town B with an average speed of 45 km h-1. It then travels from town B to town A along the same road with an average speed of 65 km h-1. What is the average speed of the car for the entire journey? A 0 km h-1 B 20 km h-1 C 53 km h-1 D 55 km h-1 4 A moon buggy used by astronauts has a weight of 2100 N on the Earth. The gravitational field strength on the Moon is 1 6 of that on the Earth. What is the weight of the moon buggy on the Moon? A 210 N B 350 N C 2100 N D 12600 N volume of air in a typical classroom: (L) 16 m × (W) 12 (m) × (H) 4 m ≈ 800 m3. Hence correct order of magnitude is ×102 m3 Ans: C vectors: displacement, force, weight, velocity, gravitational field strength, moment Ans: B weight on earth = mgearth = 2100 N weight on moon = m( 1 6 gearth) = 1 6 × weight on earth = 1 6 × 2100 = 350 N Ans: B From town A to town B: d t1 = 45 → t1 = d 45 From town B to town A: d t2 = 65 → t2 = d 65 Average speed = 2d t1+t2 = 2d d 45+ d 65 = 53.2 km h-1 Ans: C

3 6091/01/CGS/2025 5 An object falls without air resistance. Its position at equal time intervals is shown by a sequence of dots. Which sequence of dots is correct? Without air resistance, object falls with a constant acceleration. Hence the displacement (which is given by the separation of the dots) for the next time interval increases. Ans: D

4 6091/01/CGS/2025 6 An object slides down a rough slope as shown. In which direction does the surface exert a force on the object? 7 The diagram shows a uniform solid block on a road next to a kerb that is 15 cm high. The block is 40 cm high, 20 cm thick and 30 cm long and has a mass of 6.0 kg. Determine the minimum force, F, required to tilt the block onto the kerb. A 3.0 N B 15 N C 24 N D 30 N 8 A man uses clay to make a pot. He wants the pot to be as stable as possible when placed on a flat surface. Which two features of the pot must the man consider? A the area of the base and the height of the centre of gravity B the density of the clay and the area of the base C the density of the clay and the height of the centre of gravity D the weight and the height of the centre of gravity Force that surface acts on the object is the resultant of the normal contact (in direction of C) and friction (in direction of A) Ans: B Taking moments about top-right corner of kerb: Sum of clockwise moments = Sum of anti-clockwise moments (6 × 10) × 10 = F × (40 – 15) F = 24 N Ans: C The stability of an object is affected by 1. the position is of its C.G. 2. its base area Ans: A

5 6091/01/CGS/2025 9 Two identical thin tubes, M and N, contain mercury as shown. One end is opened to the atmosphere and the other end has trapped air inside. It is observed that x is shorter than y in length. Which statement is the correct explanation? A Atmospheric pressure on the mercury is larger in M than that in N. B Atmospheric pressure on the mercury is smaller in M than that in N. C Pressure of trapped air in M is larger than that in N. D Pressure of trapped air in M is smaller than that in N. 10 The diagrams show liquids in containers. Which column of liquid exerts the greatest pressure on the base of its container? The pressure at the open ends is equal to atmospheric pressure. For the tube on the left, pressure of trapped air is equal to the sum of atmospheric pressure and the pressure due to the column of liquid. For the tube on the right, the sum of the pressure of trapped air and the pressure due to the column of liquid is equal to the sum of atmospheric pressure. Ans: C The pressure exerted by liquid on base of container = hρg Ans: B

6 6091/01/CGS/2025 11 The diagram shows two identical vessels X and Y connected by a very short pipe with a tap. Initially, X is filled with water of mass m to a depth h and Y is empty. When the tap is opened, water flows from X to Y until the depths of water in both vessels are equal. By considering the change to the position of the centre of gravity of the entire body of water, what is the decrease in the gravitational potential store of the water during this process? A 0 B mgh 4 C mgh 2 D mgh 12 A 15 W lamp is turned on for 30 minutes. During this period, it transfers 1000 J of energy to its internal store and 2500 J of energy to the internal store of the surrounding air. What is the efficiency of the lamp? A 0.13 B 0.29 C 0.71 D 0.87 13. What happens when a solid is heated and expands? A The molecules do not change size and the spaces between the molecules become larger. B The molecules expand and the spaces between the molecules become larger. C The molecules expand and the spaces between the molecules become smaller. D The molecules expand and the spaces between the molecules do not change size. efficiency = useful work total energy input = 15×30×60 - (1000+2500) 15×30×60 = 0.87 Ans: D Depth of water at equilibrium is h 2. Hence, the centre of gravity of the water decreases from h 2 to h 4. Thus loss in potential energy is mgh 4 . Ans: B size of molecules does not change with temperature the distance between molecules increases with temperature Ans: A tap

7 6091/01/CGS/2025 14 The syringe in the diagram contains a gas at atmospheric pressure. The piston moves freely along the cylinder without any friction. When the syringe is heated from 40 C to 100 C, the piston moves outwards. When the temperature becomes steady, the piston stops moving. Which row correctly describes how the value of each of the following quantities at 100 C compares with its corresponding value at 40 C, after the piston stops? average speed of gas molecules pressure of gas in the cylinder A increases increases B increases unchanged C unchanged increases D unchanged unchanged 15. A copper rod is heated at one end. Which statement describes how heat transfer occurs in the copper? A Energetic copper molecules move from the cooler end to the hotter end. B Energetic copper molecules move from the hotter end to the cooler end. C Energetic free electrons move from the cooler end to the hotter end. D Energetic free electrons move from the hotter end to the cooler end. microscopic kinetic energy and hence average speed of molecules increases with temperature pres