2025 ZHSS Physics Prelim Paper 1 QP

1 [Turn over ZHONGHUA SECONDARY SCHOOL PRELIMINARY EXAMINATION 2025 SECONDARY 4 EXPRESS Candidate’s Name Class Register Number PHYSICS 6091 /01 Paper 1 26 August 2025 1 hour Additional Materials: OTAS READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, index number and class on the OTAS in the spaces provided. 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 OTAS. Read the instructions on the OTAS 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. This document consists of 22 printed pages.

2 1 Velocity is given by the change in displacement divided by the change in time. How many vector quantities appear in this statement? A 0 B 1 C 2 D 3 2 The velocity-time graph represents a short journey of an object. Which displacement-time graph represents the same journey? A B 3 A man drives from Serangoon to Woodlands. The total distance he travels is 19 km. He started driving from Serangoon for 15 min and rested half an hour at a coffee shop. He then continued driving 20 min before he reached Woodlands. What is the man’s average driving speed? A 0.54 km/h B 18 km/h C 19 km/h D 33 km/h C D

3 [Turn over 4 The table below shows the readings on a car speedometer at every five seconds interval. time / s speed / km/h 0 0 5 10 10 22 15 36 20 54 Which of the following describes the acceleration of the car? A constant B decrease C Increase D zero 5 Forces of 4.0 N and 2.0 N act at a point. Which scale diagram shows the forces that have a resultant of 4.0 N?

4 6 An aeroplane is half way along a runway before it takes off. The arrows show the directions of four forces acting on the aeroplane. The drag forces on the aeroplane are negligible. The gravitational field strength g is 10 N/ kg. The acceleration of the aeroplane is 2.0 m/s2. What is the largest force? A the force on wheels from the ground B the lift acting on the wings C the thrust from the jet engines D the weight of the aeroplane 7 Four solid uniform cones have equal weight. They are placed on a bench as shown in the scale diagram. Which cone is the most stable?

5 [Turn over 8 The stability of a bus is tested by tilting it on a ramp. The diagram shows a bus that is just about to topple over. Which statement is correct? A Centre of gravity is at position X and anti-clockwise moments is contributed by the weight of the bus, about the pivot. B Centre of gravity is at position Y and zero moments is contributed by the weight of the bus, about the pivot. C Centre of gravity is at position Z and zero moments is contributed by the weight of the bus, about the pivot. D Centre of gravity is at position Z and clockwise moments is contributed by the weight of the bus, about the pivot. X Y Z

6 9 The diagram shows a simple car brake system. The slave piston and the master piston has a diameter of 1.0 cm and 3.0 cm respectively. If the force exerted on the slave piston is 100 N, what is the force exerted on the master piston during braking? A 200 N B 300 N C 600 N D 900 N 10 A mercury manometer that is connected to a gas supply. Atmospheric pressure is assumed to be 0.75 mHg. What is the pressure of the gas supply? A 29 cmHg B 31 cmHg C 45 cmHg D 105 cmHg 11 A man lifts five slabs from the ground on to the back of a lorry 1.5 m high. The total time taken is 50 s and each slab weighs 20N. How much useful power does the builder produce? A 0.60 W B 3.0 W C 30 W D 1500 W pivot slave piston master piston 100 N 1.0 cm 3.0 cm

7 [Turn over 12 Hydroelectric, biofuel and fossil fuel power stations generate electrical energy. Which option shows renewable and non-renewable energy sources? hydroelectric biofuel fossil fuel A non-renewable renewable renewable B non-renewable non-renewable renewable C renewable non-renewable non-renewable D renewable renewable non-renewable 13 Gas in a sealed glass container is cooled. What happens to the gas molecules? A They move closer together and their average speed decreases. B They move closer together and their average speed increases. C They move further apart and their average speed decreases. D They stay the same distance apart and their average speed decreases. 14 When pollen grains suspended in water are viewed under the microscope, they are seen to be making small, erratic movements. Which statement explains the movements? A There are convection currents in the water. B The grains are being hit by air molecules. C The grains are being hit by water molecules. D The grains are moving and colliding with one another.

8 15 The diagram shows a block of ice placed in a warm room. At which point is the temperature the lowest? 16 The diagram shows a stick of ice cream that is fried in hot oil. Before the ice cream was fried, it was dipped in dough mixed with bicarbonate of soda. Why does the ice cream remain frozen after it has been fried? A The dough contains gas bubbles which allow heat energy that is trapped in the region near the ice cream to escape to the environment via convection currents. B The dough contains gas bubbles which is a poor conductor of heat energy from hot oil to cold ice cream. C The heat energy from the hot oil is not able to radiate effectively to the cold ice cream. D The ice cream which is removed from the freezer has a layer of ice around it and ice is a good insulator of heat energy. 17 What is the correct unit for latent heat of vaporisation? A J B J/kg C J/kgK D J/kgOC ice cream gas bubbles flour dough

9 [Turn over 18 Substances can change from one state to another as shown. For substances to change from one state to another, there is a change in the internal energy between the particles in the system. Which option correctly shows the changes involving the energy store that is made up of the total kinetic energy and the total potential energy between the particles in the system? stage change in total kinetic energy change in total potential energy A 1 increases increases B 2 increases decreases C 3 no change decreases D 4 decreases increases 19 A heater with a power rating of 1000 W is used to heat water of mass 0.10 kg. The water was initially at 30 oC and started boiling. At the end of time t, the mass of water left is 0.080 kg. The specific heat capacity of water is 4.2 kJ/(kgK). The specific latent heat of vaporization of water is 2.2 × 106 J/kg. What is t? A 44 s B 73 s C 180 s D 210 s

10 20 Diagram shows a duck weed in the way of a water ripple. Which best describes how the duck weed will move as the water ripple passes through? A B 21 The displacement-time graph below represents the original, sound X and the new