CHS 2021 - Sec 4 PHYSICS Prelim Exam PAPER 1 - Questions

1 Name: Index Number: Class: CATHOLIC HIGH SCHOOL Preliminary Examination Secondary 4 (O-Level Programme) PHYSICS 6091/01 Paper 1 Multiple Choice 16 September 2021 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use paper clips, glue or correction fluid. Write your name, index number and class on the Answer Sheet in the spaces provided. There are forty 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 Answer Sheet. Read the instructions on the Answer Sheet very carefully. 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 an approved scientific calculator is expected, where appropriate. For examiner’s use only: Total Marks / 40 Paper Type of Paper Marks Weighting 1 Multiple Choice 40 30 % 2 Theory 80 50 % 3 Practical 40 20 % This document consists of 16 printed pages.

2 1 Which one of the following base quantities is paired correctly? Physical Quantity SI unit A electric current A B length cm C mass g D temperature °C 2 Which one of the following has the same value as 0.1 µm? A 0.0001 nm B 100 nm C 0.0001 cm D 100 cm 3 The diameter of a piece of wire is measured using a micrometer screw gauge. A student takes an initial zero reading and then a reading of the diameter. The following figures show enlargements of the micrometer screw gauge readings. What is the diameter of the wire? A 1.86 mm B 2.36 mm C 2.48 mm D 2.98 mm 4 A student dropped a metal sphere and a ping-pong ball from a thirty-storey building. The balls have the same volume and there was significant air resistance as the objects were falling. He made the following statements: I Both objects will have the same initial acceleration. II The metal sphere will have a greater final velocity than the ping-pong ball when it hits the ground. III The metal sphere will reach the ground first. Which of the statements are correct? A I and II B I and III C II and III D I, II and III

3 5 A girl throws a ball vertically upwards. It takes a time of 3.20 s to return to her hand. Assume air resistance is negligible. What is the initial speed with which the ball is thrown? A 3.2 m/s B 6.4 m/s C 16.0 m/s D 32.0 m/s 6 Two forces of equal magnitude are represented by two vectors on the same plane. One is directed towards the east and the other is directed towards the north. What is the direction of a single force that will balance these two forces? A towards the north-east B towards the north-west C towards the south-east D towards the south-west 7 A charged oil drop is at rest between two charged parallel plates as shown below. Which forces act on the oil drop? A both electric and gravitational B electric only C gravitational only D neither electric nor gravitational 8 A steel pellet with a mass of 6.0 g is travelling on the ground to the right. It then collides head-on with the wall. It strikes the wall with a velocity of 5.0 m/s and rebounds to the left with a velocity of 4.0 m/s. The time of contact between the wall and the pellet is 0.10 s. What is the average force exerted by the wall on the pellet? A 0.060 N B 0.54 N C 60 N D 540 N

4 9 The density of paper is 800 kg/m3. A typical sheet of paper has a width of 210 mm and a length of 300 mm. The thickness of a pack of 500 sheets of paper is 50 mm. What is the mass of a single sheet of paper? A 0.50 g B 5.0 g C 50 g D 500 g 10 A force F is applied to a beam at a distance d from a pivot. The force acts at an angle θ to a line perpendicular to the beam. Which combination will cause the largest turning effect about the pivot? F d θ A large large large B large large small C small small large D small large small

5 11 A student finds the centre of mass of a triangular lamina PQR. He drills a small hole at Q. He suspends the lamina from a pin through the hole at Q so that the lamina swings freely. He then hangs a plumb-line from the pin at Q, as shown. He marks the position of the plumb-line on the lamina. To determine the location of the centre of mass, the student then repeats the experiment but with one change. What is the change? A He suspends the lamina from the hole at Q, with R on the left and P on the right. B He suspends the lamina from a pin through a hole at R. C He uses a heavier weight on the plumb-line. D He uses a longer plumb-line. 12 A brick of mass 8.0 kg rests on one of its flat surfaces on the ground. The gravitational field strength g is 10 N/kg. What is the minimum pressure it can exert on the ground? A 0.40 Pa B 400 Pa C 4000 Pa D 40 000 Pa

6 13 Two bulbs X and Y containing air at different pressures are connected by a tube P which contains two threads of liquid. P contains some gas and the density of the liquid is 100 kg/m3. Which pair of values of h1 and h2 is possible? h1/ cm h2/cm A 20 30 B 30 20 C 90 140 D 140 90 14 A small diesel engine uses a volume of 1.5 × 104 cm3 of fuel per hour to produce a useful power output of 40 kW. It may be assumed that 34 kJ of energy is transferred to the engine when it uses 1.0 cm3 of fuel. What is the rate of transfer from the engine of energy that is wasted? A 102 kW B 142 kW C 182 kW D 470 kW air pressure 1000 Pa air pressure 1500 Pa

7 15 Two boxes X and Y have the same mass. Box X is lifted vertically through a height h by a force of magnitude F. Box Y is pulled along a slope by a force of the same magnitude to reach the same height, as shown. Which statement is correct? A Both boxes gain the same amount of gravitational potential energy and the same amount of work is done by the two forces. B Both boxes gain the same amount of gravitational potential energy but more work is done by the force acting on box Y than by the force acting on box X. C Box Y gains less gravitational potential energy than box X because the weight of box Y is less than the weight of box X. D Box Y gains more gravitational potential energy than box X as more work is done by the force acting on box Y than by the force acting on box X. 16 A bead is released from rest at point P and slides along a wire, as shown. The diagram is not drawn to scale. The track loops around and forms a vertical circle of diameter 40 cm. At point Q, the bead has a speed of 1.4 m/s. Air resistance and friction between the wire and bead are negligible. What is the height h from which the bead is released? A 0.070 m B 0.098 m C 0.470 m D 0.498 m

8 17 Which law or principle does Brownian Motion provide evidence for? A kinetic theory of matter B Newton’s second law of motion C Newton’s third law of motion D principle of conservation of energy 18 There are gas molecules inside a cylinder. The piston of the cylinder is pulled outwards while the temperature of the gas inside does not change. How do the average speed of the gas molecules and the pressure of the trapped gas change as the piston is moved outwards? average speed of molecules pressure of the trapped gas A decreases remains the same B increases remains the same C remains the same increases D remains the same reduces 19 Which statement about the transfer of thermal energy is correct? A Transfer of thermal energy by radiation does not require a medium. B Transfer of thermal en