2021 Sec 3 Science Physics EOY Deyi Secondary with Answer

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Class lndex no. Name : DEYI SECONDARY SCHOOL Endof-Year Examination 2021 Secondary Three Express scrENcE(PHYSTCS) 5076t5077 7 od2021 1115-1300h t hours 45 minutes Additional Materials: OTAS READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so, Write your name and class/register number in the spaces above. 1 There are three sections in this paper: Section A (20 marks), Section B (45 marks) and Section C (20 marks). Answer ALL questions in Section A on the OTAS provided. Answer ALL questions in Sections B and C in the spaces provided. Hand in the OTAS separately from the answers to Sections B and C. Take acceleration due to gravity, g, to be 10 m/s2 whenever necessary. 2 3 4 5 Section Marks Section A 120 Section B t45 Section C t20 Total /85 This question paper consists of 19 printed pages, including the cover page. ffum over Partnerlnleaming 1 10

2 Section A (20 marks) Answer all questions on the OTAS provided. 'l The diagram shows the reading on a micrometer screw gauge. t5 What is the reading shown? l0 5.14 mm 5.54 mm 9.14 mm 9.64 mm 2 A pendulum clock is found to be too fast by 10 minutes per day. This clock can be conected by decreasing the amplitude of oscillation. decreasing the length of pendulum. increasing the amplitude of oscillation. increasing the length of pendulum. 3 What must change when a body is accelerating? the force acting on the body the mass of the body the speed of the body the velocity of the body 4 A car driver drove 80 km in t hour before making a stop for lunch for 30 minutes. She drove another 100 km in the next 1.5 hour in heavy traffic. what was her average speed for the whole joumey? 60 km/h 80 km/h 72kmlh 103 km/h 5 A stone is falling through the air. The acceleration of free fall is 10 m/s2. lgnoring air resistance, what happens to the stone each second during its fall? The acceleration of the stone increases by 10 m/s2. The speed of the stone increases by 10 m/s. The stone travels a distance of 10 m. The stone travels at a speed of 10 m/s. PartnerlnLeaming 111 A B c D A B c D A B c D A B c D B D A c

6 3 Which of the following is not an example of inertia? A coin remains at its original position when the card, which the coin is resting on, is pulled away suddenly. A person in a bus is thrown backwards, when the bus suddenly moves from rest. Coffee spills from the cup when a car is brought to a stop suddenly. When a few drops of blue ink are added to a beaker of water, the ink spreads evenly in the beaker after a while. On Earth, the gravitational field strength is 10 N/kg. On the moon, the gravitational field strength is 1.6 N/kg. lf an object has a weight of 50 N on Earth, what is its weight on the moon? 1.6 N 8.0 N 5.0 N 80N A uniform beam is balanced at its midpoint. An object is placed on the beam as shown in the diagram. 30cm 50N Which force will rebalance the system? 30 N acting upwards, 60 cm to the right of the midpoint 30 N acting upwards, 60 cm to the left of the midpoint 45 N acting downwards, 45 cm to the right of the midpoint 90 N acting downwards, 20 cm to the left of the midpoint 9 A man walks along a tightrope, carrying a long pole. Why does he carry the pole? to make it easier to keep his cenke of gravity over the rope to raise his centre of gravity to reduce his pressure on the rope to spread out his weight A B c D 7 A c B D 8 1 I i A B c D A B c D PartnerlnLearning 112 ffurn over

4 10 't1 A ball, starting at pointX, rolls down the hill shown in the diagram. At which point does the ball have half of its maximum kinetic energy? lgnore friction. A 300 N force is applied to a box in the direction XY in order to move it up a ramp of the dimensions shown. x How much work is done when moving the box from X to Y? ll C I) B D A c ml ml 2.0 2.8 B D m/s m/s 1.4 2.4 900 J 1500 J 1200 J 3000 J 12 A golf ball, of mass 0.10 kg, is travelling horizontally in the direction shown. 10 cm goll ball Y 30 cm A c X Assume that no kinetic energy is transferred to thermal energy or sound energy, and the gravitational field strength is 10 N/kg. What is the minimum speed the golf ball must have at X, to enable it to reach point Y? S PartnerlnLeaming 113 3m 5m 4m S

't3 14 15 5 The diagram shows a patient having her eyes tested. A chart with letters on it is placed behind her and she sees the chart reflected in a plane mirror. 2.0 m mtrlor patient chart How far away from the patient is the image of the chart? A c A c A student uses a converging lens to produce an enlarged virtual image of an insect she wishes to scrutinize carefully. The focal length of the lens is 10 cm. What is a suitable distance between the insect and the lens? 3.0 m 7.0 m 8cm 15 cm B D B D 5.0 m 'r0.0 m 10 cm 20 cm The diagram shows a wave on a string with two points P and Q marked. The wave is moving in the direction shown. P wave direct'ron ---o What will happen next? P will move to the right. P will move up. Q will move up. Q will not move. A B c D PartnerlnLeaming 114 3.0 m [Turn over

16 17 6 The diagram shows waves travelling on the sea. R Which points are one wavelength apart? T B D A c PandR RandT 300 m 1200 m 600 m 3750 m Which type of electromagnetic wave is deliberately used in some circumstances to cause damage to living cells in the human body? infra-red gamma rays microwaves radio waves 18 What is a property of all electromagnetic waves? They are deflected by magnets. They are positively charged. They travel at the speed of sound. They travel through a vacuum. 19 To find the depth of water beneath a ship, a pulse of sound is sent into the water and the time taken to receive the echo is 0.4 s. How far beneath the ship is the sea bed? (The speed of sound in water is 1500 m/s.) A B c D A B c D A c B D PartnerlnLearning 115 QandT SandT

20 7 A man who is standing at a point X between two parallel walls (as shown in the diagram) fires a starting pistol. wall wall He hears the first echo after 0.6 s and another one after 0.8 s. How long after firing the pistol will he hear the next echo? xa A c 1.2 s 1.6 s 1.4 s 2.4 s B D taIttIllItlIttIttItt PartnerlnLearning 116 [Turn over

I Section B (45 marks) Answer all questions in the spaces provided. 2'l A pair of vernier calipers is used to measure the thickness of a stack of 400 pieces of paper. The position of the vernier scale is shown in Fig. 21.1. 4 0 Fig.21.1 5 10 (a) (i) State the reading of the vernier calipers. reading = ... .. cm [1] (ii) Hence, determine the thickness of one piece of paper. (b) Describe briefly how a more accurate measurement of the thickness of the stack of papers can be obtained. tl I (c) Explain why the micrometer screw gauge is not a suitable instrument to measure the length of a pen. PartnerlnLearning 117 5 t1I

I 22 Two small tugboats are pulling a large ship in a harbour. Fig. 22.1 represents the view from above and shows the directions of the forces on the ship. 50 kN 20' tugboats 20' ship 50 kN Fi$.22.1 Each of the tugboats exerts a force of 50 kN on the ship. By drawing a vector diagram in the space below, determine the resultant of these two forces. State the scale used clearly. scale = ......., resultant force = .. kN [4] - PartnerlnLearning 118 ffurn ovei