SJI 2020 Year 3 EOY Physics 6091 P1

ST JOSEPH’S INSTITUTION END-OF-YEAR EXAMINATION 2020 (YEAR 3) CANDIDATE NAME CLASS INDEX NUMBER PHYSICS Paper 1 Additional Materials: Multiple Choice Answer Sheet 6091/01 7 OCTOBER 2020 45 minutes (08:00 – 08:45) 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 in the spaces provided. There are thirty 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 Multiple Choice Answer Sheet. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done on this question paper. This document consists of 11 printed pages including this cover page.

2 1 In a practical session, a student needs to measure the internal diameter, depth and thickness of a glass beaker. Which of the following instrument(s) should the student use? A micrometer only B vernier caliper only C micrometer and vernier calliper D micrometer or vernier calliper 2 Fig. 2.1 shows the reading of the vernier calliper when it is completely closed. Fig 2.2 shows the reading of the same vernier calliper used to measure the thickness of a book. Fig. 2.1 Fig. 2.2 What is the thickness of the book? A 0.59 cm B 0.77 cm C 0.79 cm D 0.89 cm 3 An object is propelled vertically upward with an initial velocity of 40 m/s. Ignoring air resistance, what is the velocity of the object 5.0 s later? A - 40 m/s B - 10 m/s C 8.0 m/s D 10 m/s 4 The table below describes the motion of an object travelling from P to R. distance / m time taken / s P to Q 3.0 3.0 Q to R 4.0 6.0 What is the average velocity of the object over the period of 9.0 s? A 0.56 m/s B 0.78 m/s C 1.0 m/s D 5.0 m/s P Q R

3 5 The graph shows how the height of a skydiver changes with time after he jumped from a plane. Which of the following statements best describes the motion of the skydiver? A From A to B the skydiver is undergoing acceleration. B From B to C the skydiver is undergoing decreasing deceleration C The speed of the skydiver is decreasing throughout the whole 80 s duration. D The skydiver fell through a distance of 12 500 m while travelling at constant speed. 6 An object was pulled up the slope with a constant force. The object moves up with a constant velocity of 5.0 cm/s. Which of the following statement s correctly explain why the object moves at a constant velocity of 5.0 cm/s? A The pulling force on the object is equal to the frictional force acting on the object . B The pulling force of the object is equal to the frictional force acting on the object and the component of the weight of the object that is parallel to the direction of motion. C The resultant force of the weight, the pulling force on the object and the frictional force is 0 N. D The weight of the force is equal to the pulling force on the object.

4 7 An object moves to the right on a table. The diagrams below show the forces acting on the object, table and earth. (i) (ii) (iii) Which of the following shows the correct action-reaction pair of forces? A (i) B (iii) C (ii) and (iii) D (i), (ii) and (iii) 8 When a constant force of 20 N is applied on a 200 g object, the object moves at a constant velocity of 0.50 m/s. What is the acceleration of the object if the constant force increases to 30 N? A 50 m/s2 B 100 m/s2 C 150 m/s2 D 250 m/s2 9 A cube, made of aluminium, has sides of length 8.0 cm. The centre portion of the aluminium cube is removed such that a smaller cubic hole of 4.0 cm sides is formed. Another cube of 4.0 cm sides, made of copper, is then inserted into this hole. If the density of aluminium is 2.7 g/cm 3 and copper is 9.0 g/cm 3, what is the density of the composite cube? A 2.70 g/cm3 B 3.50 g/cm3 C 4.30 g/cm3 D 5.90 g/cm3 Wobject Fobject by table Ftable by object Fobject by table Fobject by earth Fearth by object 8.0 cm 4.0 cm 8.0 cm 8.0 cm 4.0 cm 4.0 cm

5 10 Two cylinders, R and S, are made of zinc. The height of R is half the height of S, and the diameter of R is twice that of S. Which of the following statements is correct? A The density of R is half that of S. B The density of R is equal to that of S. C The density of R is twice that of S. D The density of R is four times that of S. 11 The figure shows four table lamps where M is the centre of gravity of each lamp. Which lamp is the least stable? 12 To ensure that a racing car making a sharp turn at high speed does not topple, two factors affecting the stability of the car are considered: the height of the car’s centre of gravity and the distance between its front wheels. Which of the following will make the car most stable? centre of gravity distance between front wheels A high large B high small C low large D low small SR

6 13 A beam acting as a balance is used to determine the mass of a basket of flowers. At equilibrium, the pivot is closer to the basket of flowers than to the piece of rock. What is the mass of the basket of flowers? A It is less than the mass of the rock B It is more than the mass of the rock C It is the same as the mass of the rock D It is not possible to determine 14 A graph is plotted to show the relationship between the pressure exerted by the weight of a block on a table and the base area of the block in contact with the table. Given that the weight of the block is constant, which graph shows the relationship correctly? A B C D pressure area pressure area pressure area pressure area basket of flower pivot rock centre of gravity of the beam beam basket of flowers

7 15 The figure below shows a brake system of a mountain bike. The mountain bike uses liquid-filled tubes to transmit pressure from the master piston to the slave pistons. A force of 80 N is applied on the master piston. What is the force exerted by the liquid on one of the slave pistons? A 1.6 N B 20 N C 200 N D 320 N 16 The height of the mercury column in a barometer is recorded as 75 cmHg on Earth. The barometer is brought to another planet where the atmospheric pressure is one third that of Earth and the gravitational field strength is double that on Earth. What will be the recorded height of the mercury on this planet? A 12.5 cm B 37.5 cm C 50.0 cm D 150 cm area = 50 mm2 area = 200 mm2 75 cm

8 17 What is the work done by the weight of the box to move from the top to the bottom of the slope? A Wy B Wx C W(y-x) D W(x+z) 18 A pendulum bob of mass m, attached to a light string, is released from rest at a height h above its lowest point. The speed of the bob at its lowest point is u. Ignoring air resistance, what will be the speed of the bob when it reaches a height of h 2 on the other side? A u/√2 B u/2 C u D u√2 19 A car maintains a power of 1200 W when it is moving at a constant speed of 15 m/s. What is the resistive force acting on the car when it is moving at the constant speed of 15 m/s? A 15 N B 40 N C 60 N D 80 N

9 20 It is observed that pollen grains suspended in water move in continuous and random direction. Which of the following is the correct ex