SASS 2025 4E Physics Prelim paper 1

3 Prelim Examination 2025/4Exp/Physics Paper 1 __________________________________________________________________________________________________ [Turn Over 1 The diagram shows a clothes peg. Which device is suitable for obtaining an accurate value for the height of the clothes peg? A a digital micrometer screw gauge B a measuring cylinder C a metre rule D a tape 2 What is the unit of work expressed in base unit? A (kgm)/s2 B (kgm2)/s2 C J D Nm clothes peg height

4 Prelim Examination 2025/4Exp/Physics Paper 1 __________________________________________________________________________________________________ [Turn Over 3 A heavy ball hanging from a cable is held in equilibrium by a chain Which vector diagram shows the three forces acting on the ball? A point of suspension cable heavy ball chain weight of ball weight of ball weight of ball weight of ball tension in cable tension in cable tension in cable tension in cable tension in chain tension in chain tension in chain tension in chain

5 Prelim Examination 2025/4Exp/Physics Paper 1 __________________________________________________________________________________________________ [Turn Over 4 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? A B C D direction of movement direction of movement direction of movement direction of movement

6 Prelim Examination 2025/4Exp/Physics Paper 1 __________________________________________________________________________________________________ [Turn Over 5 A spacecraft is launched vertically. The velocity-time graph of the motion of the spacecraft is shown in the diagram. What is the maximum height reached by the spacecraft? A 25 000 km B 50 000 km C 75 000 km D 100 000 km 6 A ball is dropped from rest at the top of a building. Air resistance is negligible. The velocity of the ball is 14 m/s when it hits the ground. What is the height of the building? A 2.9 m B 9.8 m C 20 m D 40 m time / h Velocity / km/h

7 Prelim Examination 2025/4Exp/Physics Paper 1 __________________________________________________________________________________________________ [Turn Over 7 Four of the gravitational forces that act between objects in the Solar System are listed. P the force on the Moon due to the Earth Q the force on the Earth due to the Sun R the force on the Earth due to the Moon S the force on the Moon due to the Sun Which two forces are a Newton’s third law pair? A P and Q B P and R C Q and S D R and S 8 A car is at rest by a red traffic light. When the light changes to green, the car starts moving. The graph represents the motion of the car. The car has a constant acceleration. Which quantity is plotted on the x-axis and which quantity is plotted on the y-axis? x-axis y-axis A distance time B speed time C time distance D time speed x-axis y-axis

8 Prelim Examination 2025/4Exp/Physics Paper 1 __________________________________________________________________________________________________ [Turn Over 9 A student drops, from rest, a light ball in air. The ball experiences some air resistance as it falls. What happens to the velocity and to the acceleration of the ball during the first few seconds after release? velocity acceleration A decreases decreases B decreases increases C increases decreases D increases increases 10 A uniform beam is pivoted at its centre and balanced by three weights as shown. What is distance x? A 17.5 cm B 22.5 cm C 35.0 cm D 37.5 cm

9 Prelim Examination 2025/4Exp/Physics Paper 1 __________________________________________________________________________________________________ [Turn Over 11 A force F causes a moment about point O on an L-shaped bar. The force F acts at point P. What is the moment of F about O? A Fd1 B Fd2 C Fd3 D Fd4 F d2 d1

10 Prelim Examination 2025/4Exp/Physics Paper 1 __________________________________________________________________________________________________ [Turn Over 12 The diagram shows a pail containing approximately equal amount of water and sand. X and Z are the centre of gravity of the sand and water respectively. More sand is added to the pail. This affects the position of the centre of gravity of the pail and its contents, and the stability of the pail. Which of the following shows how the position of the centre of gravity of the pail and its contents, and the stability of the pail will be affected? centre of gravity stability A moves from X towards Y decreases B moves from X towards Y increases C moves from Y towards Z decreases D moves from Y towards Z increases

11 Prelim Examination 2025/4Exp/Physics Paper 1 __________________________________________________________________________________________________ [Turn Over 13 A liquid is held in a cylindrical container. The diameter of the base of the cylinder is d. The mass of the liquid is m and its depth is h. Which expression gives the pressure due to the liquid on the bottom of the cylinder? 14 The diagram shows an instrument that is used to measure the atmospheric pressure. The density of mercury is 1.4104 kg/m3. What is the atmospheric pressure? A 2.7 kPa B 21 kPa C 104 kPa D 117 kPa A B C D NOT TO SCALE mercury 850 mm 760 mm 20 mm vacuum 150 mm

12 Prelim Examination 2025/4Exp/Physics Paper 1 __________________________________________________________________________________________________ [Turn Over 15 Two cubes, X and Y, have the same mass but are made of different materials. The length of a side of X is twice that of Y. What is the value of the ratio density of X density of Y ? A 0.125 B 1.0 C 4.0 D 8.0 16 A rocket is launched vertically upwards by a constant force from its engines. The data for the launch is shown. weight of rocket 1.9 MN average air resistance 0.10 MN force from engine 3.5 MN How much of the work done on the rocket is used to increase its speed in the first 100 m? A 150 MJ B 170 MJ C 350 MJ D 550 MJ