EXAMINATION SHEET DEPT. OF ACADEMICS DEPT. OF ACADEMICS Details Name of Examination Cyclic Test 3 Name of Student Class and Section IGCSE 10 Roll No. Date November 02, 2021 Subject Physics Maximum Marks: 40 Duration: 40 Minutes Additional Sheets Not Required. Graphs Not Required Maps Not Required. Questions Attempted Invigilator’s Signature and Name Date General Instructions: 1. This question paper consists of 15 printed pages and a total of 15 questions. 2. Write in dark blue or black ink. You may use a pencil for any diagrams or graphs. 3. Do not use paper clips, highlighters, and glue or correction fluid. 4. Marks allotted are given in brackets [ ] at the end of each question or part question. 5. Read each question carefully and follow the instructions. 6. Examination decorum should be maintained at all times. Use of unfair means will be dealt with as per the school policy. 7. Answer all the questions. Electronic calculator is required. For π use calculator value or 3.142. 8. Write all answers in the question paper itself. If the degree of accuracy is not specified in the question, and if the answer is not exact, give the answer to three significant figures. 9. Read each question carefully and follow the instructions. Moderator’s/HOD’s remarks and Signature Cross checker’s Total Marks Name and remarks Cross checker’s Examiner’s Signature Signature GIIS Document number ACA-37 Effective Date: 1 January 2018 Confidential | Copyright © Global Indian International School | Version 11 EXAMINATION SHEET DEPT. OF ACADEMICS DEPT. OF ACADEMICS Section A: MCQ [Total: 10] Answer the MCQs in the grid below. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Choose the correct answer: - [1 X 10 = 10] 1. The diagram shows part of a long current-carrying conductor. At which point is the magnetic field strongest? 2. A beam of particles moves through a magnetic field. In which situation do the particles experience a magnetic force? A a beam of alpha-particles moving parallel to the magnetic field lines B a beam of electrons moving parallel to the magnetic field lines C a beam of beta-particles moving perpendicularly across the magnetic field lines D a beam of neutrons moving perpendicularly across the magnetic field lines 3. Which diagram represents the strength and direction of the magnetic field around a current-carrying conductor? (The direction of the current is into the page.) GIIS Document number ACA-37 Effective Date: 1 January 2018 Confidential | Copyright © Global Indian International School | Version 12 EXAMINATION SHEET DEPT. OF ACADEMICS DEPT. OF ACADEMICS 4. The diagram shows an a.c. generator used to power a lamp. The coil rotates in a clockwise direction. Which magnetic poles are X and Y? 5. The diagram shows a coil of wire wrapped around a soft-iron rod. The wire is connected to a d.c. power supply as indicated. The apparatus is in a region which is totally shielded from the Earth’s magnetic field. GIIS Document number ACA-37 Effective Date: 1 January 2018 Confidential | Copyright © Global Indian International School | Version 13 A small compass needle is placed at point P. EXAMINATION SHEET DEPT. OF ACADEMICS DEPT. OF ACADEMICS In which direction does the N pole of the compass needle point? A towards the bottom of the page B towards the left of the page C towards the right of the page D towards the top of the page 6. Graph X shows the output from an a.c. generator. Which changes can be made so that the generator produces graph Y? A Decrease the magnetic field strength and decrease the speed of rotation only. B Increase the magnetic field strength and decrease the number of coils only. C Increase the number of coils only. D Increase the speed of rotation only. GIIS Document number ACA-37 Effective Date: 1 January 2018 Confidential | Copyright © Global Indian International School | Version 14 EXAMINATION SHEET DEPT. OF ACADEMICS DEPT. OF ACADEMICS 7. A transformer is needed to convert a supply of 240 V a.c. into 4800 V a.c.. Which pair of coils would be suitable for this transformer? 8. Cables transmit electrical power from the output of the transformer at a power station to the Input of the transformer at a substation. The power at the output of the transformer at the power station is 400 MW. Which situation delivers the most power to the input of the transformer at the substation? GIIS Document number ACA-37 Effective Date: 1 January 2018 Confidential | Copyright © Global Indian International School | Version 15 EXAMINATION SHEET DEPT. OF ACADEMICS DEPT. OF ACADEMICS 9. The graphs show how the currents in three circuits vary with time. In which circuits is there a direct current? A 1 and 2 B 1 and 3 C 2 only D 3 only GIIS Document number ACA-37 Effective Date: 1 January 2018 Confidential | Copyright © Global Indian International School | Version 16 EXAMINATION SHEET DEPT. OF ACADEMICS DEPT. OF ACADEMICS 10. The diagram represents the transmission of electricity from a power station to homes that are many kilometres away. Two transformers are labelled X and Y. What type of transformers are X and Y? GIIS Document number ACA-37 Effective Date: 1 January 2018 Confidential | Copyright © Global Indian International School | Version 17 EXAMINATION SHEET DEPT. OF ACADEMICS DEPT. OF ACADEMICS Section B: Extended Physics [Total: 20] 11. An electromagnet consists of a solenoid X that is made of copper wire. The solenoid contains an iron core. (a) Explain why: (i) the structure of copper makes it a suitable material for the wire .......................................................................................................................................... . ........................................................................................................................................... ..................................................................................................................................... [2] (ii) iron is a suitable material for the core of an electromagnet. .......................................................................................................................................... . ........................................................................................................................................... ..................................................................................................................................... [2] (b) Fig. 11.1 shows the electromagnet inside a second solenoid Y. Fig. 11.1 GIIS Document number ACA-37 Effective Date: 1 January 2018 Confidential | Copyright © Global Indian International School | Version 18 EXAMINATION SHEET DEPT. OF ACADEMICS DEPT. OF ACADEMICS (i) Describe and explain what happens in solenoid Y when solenoid X is connected to an alternating current (a.c.) power supply. .......................................................................................................................................... . .......................................................................................................................................... . .......................................................................................................................................... . ..................................................................................................................................... [3] (ii) A switch and a lamp are connected in series with the terminals of solenoid Y. When the switch is closed, the lamp lights up at normal brightness. Describe and explain what happens to the current in solenoid X when the switch is closed. .......................................................................................................................................... . .......................................................................................................................................... . ..................................................................................................................................... [2] [Total: 9] 12. Fig. 12.1 shows a simple electric motor with a single rectangular coil between magnetic poles X and Y. Fig. 12.1 GIIS Document number ACA-37 Effective Date: 1 January 2018 Confidential | Copyright © Global Indian International School | Version 19 EXAMINATION SHEET DEPT. OF ACADEMICS DEPT. OF ACADEMICS (a) (i) Add labels to the empty boxes to the right of Fig. 12.1, to identify the parts indicated. [2] (ii) The coil rotates in a clockwise direction when viewed from point P. State which of the magnetic poles, X or Y, is the N-pole. .............................................. [1] (b) (i) Suggest two changes that cause the motor to spin faster. 1.............................................................................................................................. 2.............................................................................................................................. [2] (ii) State the effect on the motor of reversing the connections to the battery. ...................................................................................................................... [1] (c) The battery in Fig. 12.1 is replaced with a resistor. The coil is made to rotate by an external mechanism. Explain why there is a current in the resistor. ................................................................................................................................ ................................................................................................................................ ................................................................................................................................ [2] [Total: 8] GIIS Document number ACA-37 Effective Date: 1 January 2018 Confidential | Copyright © Global Indian International School | Version 110 EXAMINATION SHEET DEPT. OF ACADEMICS DEPT. OF ACADEMICS 13. Fig. 13.1 represents a transformer with primary coil P and secondary coil S, wound on an iron core. There is an alternating current in coil P. Fig. 13.1 (a) Tick the box next to the correct description of the current in S. [1] (b) Coil P has 50 turns of wire, an applied voltage of 12 V, and a current of 0.50 A. Coil S has 200 turns. Calculate the current in S. Assume the transformer is 100 % efficient. current = .................................................. [2] [Total: 3] GIIS Document number ACA-37 Effective Date: 1 January 2018 Confidential | Copyright © Global Indian International School | Version 111 EXAMINATION SHEET DEPT. OF ACADEMICS DEPT. OF ACADEMICS Section C (Alternative to Practical) [Total :10] 14. Fig. 14.1 shows a simple electrical generator. By turning the handle, the single coil may be spun between the poles of the magnet. Fig. 14.1 (a) The handle is turned so that the coil makes two complete revolutions per second maximum output is 7 V. On Fig. 14.2, sketch this output over a period of 1 s. GIIS Document number ACA-37 Effective Date: 1 January 2018 Confidential | Copyright © Global Indian International School | Version 112 EXAMINATION SHEET DEPT. OF ACADEMICS DEPT. OF ACADEMICS Fig. 14.2 [3] (b) Explain (i) How an e.m.f. is induced, .................................................................................................................................. . .................................................................................................................................. . .................................................................................................................................. . .................................................................................................................................. . (ii) Why the e.m.f. varies in magnitude and direction. .................................................................................................................................. . .................................................................................................................................. . .................................................................................................................................. . ................................................................................................................................... [2] [Total: 5] GIIS Document number ACA-37 Effective Date: 1 January 2018 Confidential | Copyright © Global Indian International School | Version 113 EXAMINATION SHEET DEPT. OF ACADEMICS DEPT. OF ACADEMICS 15. A solenoid is held in a vertical position. The solenoid is connected to a sensitive, centre-zero ammeter. A vertical bar magnet is held stationary at position X just above the upper end of the solenoid as shown in Fig. 15.1. Fig. 15.1 The magnet is released and it falls through the solenoid. During the initial stage of the fall, the sensitive ammeter shows a small deflection to the left. (a) Explain why the ammeter shows a deflection. .................................................................................................................................................. . .............................................................................................................................................[1] GIIS Document number ACA-37 Effective Date: 1 January 2018 Confidential | Copyright © Global Indian International School | Version 114 EXAMINATION SHEET DEPT. OF ACADEMICS DEPT. OF ACADEMICS (b) The magnet passes the middle point of the solenoid and continues to fall. It reaches position Y. Describe and explain what is observed on the ammeter as the magnet falls from the middle point of the solenoid to position Y. ................................................................................................................................................. .................................................................................................................................................. ................................................................................................................................................. ................................................................................................................................................. ................................................................................................................................................. .............................................................................................................................................[4] [Total: 5] ****** END OF PAPER ****** GIIS Document number ACA-37 Effective Date: 1 January 2018 Confidential | Copyright © Global Indian International School | Version 115
