2021 S3 EOY P1 2021 S3 EOY P1 2021 S3 EOY P1 1 / 30 2021 S3 EOY P1 Q01 Which of the following contains only base physical quantities? length, volume and mass length, temperature and mass time, mass and energy length, temperature and speed 2 / 30 2021 S3 EOY P1 Q02 What is the equivalent of 100 kg m⁻³? 100 000 g cm⁻³ 0.10 g cm⁻³ 100 g cm⁻³ 0.010 g cm⁻³ 3 / 30 (NO LONGER TESTED) 2021 S3 EOY P1 Q03 A micrometer screw gauge is used to measure the diameter of a glass tube. Diagram 1 shows the reading on the micrometer screw gauge when it is closed with nothing between the anvil and spindle. Diagram 2 shows the reading taken for the external diameter of the glass tube. If the thickness of the glass tube is 2.20 mm, what is the internal diameter of the glass tube? 12.40 mm 13.36 mm 12.86 mm 12.90 mm 4 / 30 2021 S3 EOY P1 Q04 A ray of light is incident normally on a plane mirror. What is the angle of deviation of the ray? 0º 90º 45º 180º 5 / 30 2021 S3 EOY P1 Q05 Which of the following are the properties of an image formed from a plane mirror? (I) the image is the same size as the object (II) the image is upright (III) the image is inverted II and III only I and III only I, II and III I and II only 6 / 30 2021 S3 EOY P1 Q06 A ray of light strikes two plane mirrors placed perpendicularly to each other as shown. What is angle r? 40º 80º 50º 30º 7 / 30 2021 S3 EOY P1 Q07 The diagram below shows the top view of three optical pins being placed vertically in front of a plane mirror. When an observer looks through a hole in the barrier, how many images of the pins can the observer see? 2 1 0 3 8 / 30 2021 S3 EOY P1 Q08 What is the refractive index of a medium? The ratio of the speed of light in vacuum to the speed of light in the medium. The ratio of the speed of light in air to the speed of light in the medium. The ratio of the speed of light in medium to the speed of light in the vacuum. The ratio of the speed of light in vacuum to the speed of light in air. 9 / 30 2021 S3 EOY P1 Q09 A ray of light is travelling from air to water. Which ratio represents the refractive index of water? sin (90º − α) / sin (90º − β) sin α / sin β sin β / sin α sin (90º − β) / sin (90º − α) 10 / 30 2021 S3 EOY P1 Q10 A ray of light travels from medium P to medium Q. Medium P has a lower refractive index than medium Q. Which of the rays are possible? 2 only 4 only 1 only 3 and 4 only 11 / 30 2021 S3 EOY P1 Q11 A light ray travels from a medium of refractive index 1.7 to a medium of refractive index 1.5. At what angle will total internal reflection occur? 90º 42º 36º 62º 12 / 30 2021 S3 EOY P1 Q12 Two lenses, G and H, of the same diameter are made of the same material. G is twice as thick as H. Which statement is true? G will have a longer focal length than H. G will have a shorter focal length than H. G and H have the same focal length. G will have a focal length twice that of H. 13 / 30 2021 S3 EOY P1 Q13 Which statement is true about converging lenses? A B C D The images formed are always on the focal plane. The image distance of a faraway object is its focal length. The images obtained are always real. The images obtained are always inverted. 14 / 30 2021 S3 EOY P1 Q14 A ray of light travels through a converging lens as shown in the scaled diagram below. Which is the correct emergent ray? D B C A 15 / 30 2021 S3 EOY P1 Q15 A runner runs 5.0 km towards the West in 0.50 hours and 5.0 km towards the East in 1.5 hours. What is his average speed? 0 km h⁻¹ 5.0 km h⁻¹ 0.2 km h⁻¹ 6.7 km h⁻¹ 16 / 30 2021 S3 EOY P1 Q16 A ticker-tape timer is used to investigate the movement of a trolley. The frequency of the timer is 65 Hz and a portion of the tape is shown in the diagram (not drawn to scale) below. What is the average deceleration of the trolley? 1300 cm s⁻² 790 cm s⁻² 3200 cm s⁻² 560 cm s⁻² 17 / 30 2021 S3 EOY P1 Q17 A car travels at a constant speed along a straight road. When the driver sees a cat dashing across the road, he immediately steps on the brakes. The car decelerates at a constant rate of 15 m s⁻² and stops after it travels a further 30 m. What was the speed of the car before the driver stepped on the brakes? 30 m s⁻¹ 15 m s⁻¹ 25 m s⁻¹ 2.0 m s⁻¹ 18 / 30 2021 S3 EOY P1 Q18 A ball is released from rest at point L on a track LM. The track is frictionless and air resistance is negligible. Which graph correctly shows how the speed of the ball varies with time as the ball travels from L to M? D C B A 19 / 30 2021 S3 EOY P1 Q19 Two balls, O and P, are dropped at the same time from different levels of the same building. Ball O took twice the time of ball P took to reach the ground. Ignoring the effects of air resistance, what is the ratio of the acceleration of ball O to ball P? 4 : 1 1 : 1 2 : 1 1 : 2 20 / 30 2021 S3 EOY P1 Q20 A man standing on top of a 150 m building throws a pebble vertically upwards with an initial velocity of 5.0 m s⁻¹. How long does it take for the pebble to hit the ground from the time it leaves the man’s hand? 0.5 s 5.0 s 3.0 s 6.0 s 21 / 30 2021 S3 EOY P1 Q21 A person is standing upright inside a bus moving forward at constant velocity when the bus driver suddenly steps on the brakes. Which statement is true about the person’s subsequent motion? The person leans towards the back of the bus, due to his tendency to remain stationary. The person leans towards the front of the bus, due to his tendency to continue moving at a constant velocity. The person leans towards the back of the bus, due to his tendency to continue moving at a constant velocity. The person leans towards the front of the bus, due to his tendency to remain stationary. 22 / 30 2021 S3 EOY P1 Q22 A ball of mass 6.0 kg sinks in water at a constant velocity of 3.0 m s⁻¹. What is the resultant force on the ball? 54 N 18 N 0 N 60 N 23 / 30 2021 S3 EOY P1 Q23 The mass of a hovercraft is 20 000 kg. The propeller on a hovercraft pushes air backwards with a force of 40 000 N. The hovercraft moves through the air and water against a total resistive force of 16 000 N. What is the acceleration of the hovercraft? 0.8 m s⁻² 2.8 m s⁻² 1.2 m s⁻² 2.0 m s⁻² 24 / 30 2021 S3 EOY P1 Q24 Two masses M and N are connected by a string over a frictionless pulley, as shown in the diagram. When the masses are released, N pulls M along a smooth surface. Assume air resistance to be negligible. If the masses of M and N are increased, which statement is true about the acceleration of the masses? Acceleration becomes smaller. According to Newton’s Second Law of Motion, acceleration is inversely proportional to mass. The effect on acceleration is uncertain without the actual values of masses M and N. Acceleration becomes larger, since the larger weight of mass N would lead to a larger resultant force. Acceleration remains the same, since the acceleration of this system is independent of mass. 25 / 30 2021 S3 EOY P1 Q25 Which cannot be the magnitude of the resultant force when a force of 6.0 N and a force of 9.0 N act on an object? 6.0 N 2.5 N 14.5 N 3.5 N 26 / 30 2021 S3 EOY P1 Q26 A box of mass 2.0 kg is stationary on a slope. The slope is inclined downwards at an angle of 60º to the vertical, as shown in the diagram. What is the frictional force between the box and the slope? 13 N 15 N 17 N 10 N 27 / 30 2021 S3 EOY P1 Q27 A metre rule is balanced at its midpoint P on a pivot. A force of 20 N is then applied on the metre rule. Which moment of the 20 N force about P is not possible? 20 N m 0 N m 10 N m 5.0 N m 28 / 30 2021 S3 EOY P1 Q28 Four blocks P, Q, R and S are balanced on a uniform beam with the pivot at the centre in different combinations. Which of the following correctly arranges the blocks in order of increasing mass? S, R, P, Q R, S, P, Q Q, P, R, S Q, P, S, R 29 / 30 2021 S3 EOY P1 Q29 A uniform metre rule of mass 0.100 kg is suspended from the ceiling with two identical spring balances as shown in the diagram below. The points of suspension are at the 30-cm and 90-cm marks. Where should a 0.050 kg mass be placed such that the spring balances have the same reading? 70-cm mark 80-cm mark 10-cm mark 40-cm mark 30 / 30 2021 S3 EOY P1 Q30 A uniform circular lamina has a circular section cut from it as shown in the diagram. Where is the centre of gravity of the remaining section likely to be located? D A B C Your score is