2025 CCHY Pure Physics Prelim P1 + P2 + MS

2 CCHY 2025 6091/01/Sec 4/Aug/25 [Turn Over 1 For which quantity is the magnitude a reasonable estimate? quantity magnitude A diameter of an atom 50 µm B Earth’s gravitational field strength 9.0 N / kg C refractive index of glass 0.93 D wavelength of radio waves 5.0 m 2 Which expression with only SI base units is equivalent to the newton? A J / m B kg m / s² C kg m² / s D kg m² / s² 3 Which group of quantities contains only vectors? A acceleration, displacement, speed B acceleration, gravitational field strength, work done C displacement, force, velocity D gravitational field strength, force, power 4 The variation of velocity with time of a car is shown in the diagram. What is the acceleration of the car? A 190 m / s² B 53 m / s² C 26 m / s² D 7.3 m / s² 2025 Phy Set 6

3 CCHY 2025 6091/01/Sec 4/Aug/25 [Turn Over 5 On Mars, the gravitational field strength is 38% of that on Earth. A body has a mass of 2.5 kg and weight of 25 N on Earth. What are the mass and weight of this body on Mars? mass on Mars / kg weight on Mars / N A 0.95 9.5 B 0.95 66 C 2.5 9.5 D 2.5 66 6 A ball falls from rest through air and eventually reaches terminal velocity. For this fall, forces X and Y acting on the ball vary with time as shown. What are forces X and Y? force X force Y A air resistance resultant force B air resistance weight C resultant force air resistance D resultant force weight

4 CCHY 2025 6091/01/Sec 4/Aug/25 [Turn Over 7 A model plane is descending at constant speed at an angle to the horizontal. The diagram shows the directions of the lift L, air resistance R and weight W acting on the plane. Which vector diagram could represent the forces acting on the glider? 8 A book rests on a table. What is the reaction to the weight of the book? A the pull of the book by the Earth B the pull of the Earth by the book C the push of the book on the table D the push of the table on the book

5 CCHY 2025 6091/01/Sec 4/Aug/25 [Turn Over 9 A piece of cardboard with uniform thickness is freely suspended from point O, where OC = 13 cm. The weight of the cardboard is 7.3 N and its centre of gravity is at C. When the lamina is displaced to the position with OA = 12  cm, what is the moment of the force (due to the weight) about point O that causes the lamina to swing? A 7.3 N cm anticlockwise B 37 N cm clockwise C 88 N cm clockwise D 95 N cm anticlockwise 10 Similar sets of books are placed in identical bookcases. Which bookcase is most likely to fall backward if pushed sightly from the front?

6 CCHY 2025 6091/01/Sec 4/Aug/25 [Turn Over 11 A volume of 1.5 m³ of water is mixed with 0.50 m³ of alcohol. The density of water is 1000 kg / m³ and the density of alcohol is 800 kg / m³. The volume of the mixture is 2.0 m³. What is the density of the mixture? A 850 kg / m³ B 900 kg / m³ C 940 kg / m³ D 950 kg / m³ 12 A horizontal plate of area 0.036 m² is placed beneath the surface of a liquid of density 930 kg / m³. The force acting on the plate due to the pressure of the liquid is 290 N. The gravitational field strength is 10 N / kg. The effect of atmospheric pressure is negligible. What is the depth of the plate beneath the surface of the liquid? A 0.87 m B 1.13 m C 8.7 m D 9.1 m

7 CCHY 2025 6091/01/Sec 4/Aug/25 [Turn Over 13 A thin tube contains a short thread of mercury, trapping a column of air at one end. The other end of the tube is open to the atmosphere. When the tube is held vertically, the length of the trapped air column is X. When the tube is placed horizontally, the length of the trapped air column is Y. Which statement correctly describes the relationship between lengths X and Y? A X may be greater or smaller than Y, depending on atmospheric pressure. B X is always greater than Y, due to increased pressure from the mercury thread. C X is always smaller than Y, due to increased pressure from the mercury thread. D X is always equal to Y, as atmospheric pressure remains constant. 14 A toy car travels fom P to Q along a track. P is higher than Q. At P, the car has 8.0 kJ of energy in its kinetic store. At Q, its gravitational potential store has 35 kJ less energy than that at P. Between P and Q, 10 kJ of work is done against friction. What is the minimum energy in the car’s kinetic store at Q? A 33 kJ B 45 kJ C 53 kJ D 65 kJ NOT DRAWN TO SCALE

8 CCHY 2025 6091/01/Sec 4/Aug/25 [Turn Over 15 An electrical heater is turned on at time zero. The total thermal energy transferred by the heater during the first 6 seconds is shown in the graph. What is the maximum power output of the heater at any instant during these 6 seconds? A 10 W B 20 W C 30 W D 40 W 16 What are the energy changes in nuclear power production? A chemical → thermal → electrical B electrical → thermal → nuclear C nuclear → chemical → electrical D nuclear → thermal → electrical 17 When energy is continuously removed from the thermal store of a substance at a steady rate, its temperature decreases but occasionally remains constant for a period of time. What is happening to the substance when its temperature remains constant temporarily? A The substance is losing thermal energy faster. B The substance is undergoing a change in physical state. C The substance is experiencing an increase in internal energy. D The substance has reached thermal equilibrium with its surroundings.

9 CCHY 2025 6091/01/Sec 4/Aug/25 [Turn Over 18 Why does the pressure inside a sealed container of gas increase when the gas is heated? A The gas molecules collide more frequently with each other. B The gas molecules expand when heated. C The gas molecules move faster and collide with the walls of the container more frequently. D There are more gas molecules present to collide with the walls of the container. 19 What is meant by the internal energy of an object? A The energy related to the object’s motion through space. B The energy due to the random motion of molecules in the object. C The energy arising from the forces of attraction between the molecules. D The total of all the kinetic and potential energies of the molecules in the object. 20 A 0.10 kg block of copper requires 1160 J of thermal energy to increase its temperature from 10 °C to 40 °C. What is the numerical value of the ratio specific heat capacity of copper heat capacity of the copper block ? A 1 30 B 1 10 C 10 D 30 21 The graph shows how the displacement of a particle in a wave varies with time. The wave has an amplitude of A 10 mm and could be either transverse or longitudinal. B 10 mm and must be transverse. C 20 mm and could be either transverse or longitudinal. D 20 mm and must be transverse.

10 CCHY 2025 6091/01/Sec 4/Aug/25 [Turn Over 22 The diagram shows the shape of part of a transverse wave travelling along a rope at a particular instant. P, Q, R and S are four different points on the rope. The wave is travelling towards the right. Which statement is correct? A P and Q are moving to the right. B P and R are moving downward. C Q and R are moving upward. D Q and S are moving to the left. 23 A radar system sends out a pulse of radio waves which reflects off an aircraft and returns to the receiver after 240 µs. The speed of radio waves in air is 3.0 × 10⁸ m/s. What is the distance between the radar and the aircraft? A 3.6 km B 7.2 km C 36 km D 72 km

11 CCHY 2025 6091/01/Sec 4/Aug/25 [Turn Over 24 A ray of light is reflected by two parallel plane mirrors X and Y. Which statement is correct? A The angle of incidence at mirror X is 30°. B The angle of reflection at mirror X is 60°. C The angle of reflection at mirror Y is 30°. D The angle of incidence at mirror Y is 120°. 25 The diagram shows a ray of light incident on the boundary between two mediums, P and Q. The mediums have different refractive indexes. Some of the incident light is reflected back into medium P Some