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