2021 4E Prelim PHY P1

Name of Candidate: _____________________ ( ) Class: ______ Calculator Model: This paper consists of 17 printed pages BUKIT PANJANG GOVERNMENT HIGH SCHOOL PRELIMINARY EXAMINATION 2021 SECONDARY 4 EXPRESS PHYSICS Paper 1 6091 / 01 Date: 31 August, 2021 Duration: 1 hour Time: 0745-0845 READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class, and index number on the OAS in the spaces provided. There are forty questions in this paper. Answer all questions. For each question, there are four possible answers A, B, C or D. Choose the one you consider correct and record your choice in soft pencil on the OAS provided. 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 scientific calculator is expected, where appropriate. Setter: Ms. Le Nam Chi [Turn over FOR EXAMINER’S USE Total: / 40 Additional Materials: OAS

2 1 The angular momentum of an object in a circular orbit can be calculated using the formula: Angular momentum = mass x velocity x radius of orbit What is the derived SI unit of angular momentum? A kgm-2 B kgm2s-1 C kgms2 D kgms-2 2 A stone is dropped from a tall building. 5 seconds later, an identical stone is dropped from the same height. Which of the following statements is correct about the motion of the two stones before they hit the ground? Assume air resistance is negligible. A The distance between the stones will remain constant throughout. B The distance between the stones will increase with time. C The distance between the stones will decrease with time then remain constant. D The distance between the stone will decrease with time. 3 Which of the following diagram represents the velocity-time graph of an object when a constant force is applied on it? A B C D velocity velocity velocity velocity time time time time

3 4 A block accelerates at 1.7 ms-2 from a height of 0.21 m down a smooth plank from rest. The plank is inclined at an angle of 10° to the horizontal. What is the speed of the block at the bottom of the plank? A 0.83 ms-1 B 2.0 ms-1 C 4.8 ms-1 D 14 ms-1 5 To pull a tree stump out of the ground, two tractors pull on ropes in different directions. The diagram, not drawn to scale, shows the view from the top. Which of the following options shows the most likely resultant force? A B C D block 1000 N 1500 N [Turn over 0.21 m 10°

4 6 The diagram below shows a train car that is loaded with sand. It is moving at a constant speed along a smooth horizontal track with negligible friction. A hole develops in the bottom of the car and sand starts spilling out onto the ground at a constant rate. While the sand is spilling out, how does the speed of the car change? Ignore air resistance. A It decreases uniformly. B It increases uniformly. C It increases at an increasing rate. D It stays the same. 7 A brick is placed on a table top. A force F is applied on it such that the brick moves with a constant speed, as shown in the diagram below. How will the speed of the brick change immediately after the force F is removed? A It will decrease. B It will increase. C It will be the same. D There is not enough information to form a conclusion. direction of motion motion F

5 8 Min Min pushes a thick Physics book against the ceiling using a force F of 30 N. The book has a weight of 20 N. Which of the following options shows the correct value for each pair of contact forces? between ceiling and book between hand and book A 10 N 50 N B 10 N 30 N C 20 N 30 N D 30 N 10 N 9 The following four properties of a solid object are measured in a laboratory on the Earth’s surface. Which property would have a different value if measurements were carried out in a space laboratory? A Density of the object B Mass of the object C Weight of the object D Volume of the object 10 A rectangular, uniform signboard is attached to a vertical wall by a hinge at P so that Q rests against the wall vertically below P. wall signboard If the mass of the signboard is 60 kg, what is the normal reaction, F, exerted by the wall at Q? A 200 N B 400 N C 450 N D 900 N F 3 m 2 m F ceiling Q P [Turn over

6 11 A trolley of mass 50 kg runs from position P to Q along a rough track. At point Q, its potential energy is 50 J less than at point P. Its speed at point P is 3.0 ms-1. The work done against friction from point P to Q is 20 J. What is the speed of the trolley at point Q? A 1.1 ms-1 B 1.4 ms-1 C 3.0 ms-1 D 3.2 ms-1 12 Amin and Kumar start off at the same time to run up a hill. Amin is 50 kg while Kumar is 70 kg. Which statement is true about the power produced? A Amin produced more power. B Kumar produced more power. C They produced the same power. D It is impossible to tell from the information provided. 13 In a hydraulic press, a small piston of weight 150 N is pushed down and this force is just sufficient to raise a heavy load in the large piston. Neglecting the weight of the pistons, what is the maximum load that can be lifted? A 7.5 N B 500 N C 750 N D 3000 N 150 N small piston of area 5.0 cm2 large piston of area 100 cm2 P Q

7 14 A uniform capillary tube is closed at one end. It contains air trapped by a thread of mercury 80 mm long. When the tube is held horizontally, the length of the air column is 20 mm. When it is held vertically with the closed end downwards, the length is 18 mm. Given that the atmospheric pressure is p, which of the following expression shows the pressure, in terms of p, exerted by the mercury column on the trapped air? A p 10 B p C p 9 D p-80 15 The mercury-in-glass thermometer in the diagram below has a linear scale. At a temperature of 100 °C, h has a value of 28 cm. At 80 °C, h has a value of 24 cm. What is the value of h when the temperature is 20 °C? A 0.0 cm B 4.0 cm C 8.0 cm D 12.0 cm 16 What does the temperature of a gas measure? A average velocity of the gas molecules B maximum velocity of the gas molecules C average kinetic energy of the gas molecules D total kinetic energy of the gas molecules 80 mm 80 mm 20 mm 18 mm [Turn over

8 17 A fixed mass of gas is kept at constant volume. When the temperature of the gas increases, the pressure increases. What is the reason for the increase in pressure? A The gas molecules move more vigorously. B The gas molecules are closer together. C The gas molecules collide more frequently against one another. D The gas molecules expands with temperature. 18 In very cold weather, ice can form on the surface of puddles of water because the air temperature is below that of the water. If the ice layer is found to be thickening at its lower surface, what is the main method of thermal transfer that causes this? A Convection through the water. B Conduction through the air. C Conduction from the