Tiêu đề 2024 DSE PHY P1 E.pdf ✅

2024-DSE PHY PAPER 1A HONG KONG EXAMINATIONS AND ASSESSMENT AUTHORITY HONG KONG DIPLOMA OF SECONDARY EDUCATION EXAMINATION 2024 PHYSICS PAPER 1 8:30 am — 11:00 am (2% hours) This paper must be answered in English GENERAL INSTRUCTIONS (1 (2) (%) There are TWO sections, A and B, in this Paper. You are advised to finish Section A in about 50 minutes. Section A consists of multiple-choice questions in this question paper, while Section B contains conventional questions printed separately in Question-Answer Book B. Answers to Section A should be marked on the Multiple-choice Answer Sheet while answers to Section B should be written in the spaces provided in the Question-Answer Book. The Answer Sheet for Section A and the Question-Answer Book for Section B will be collected separately at the end of the examination. The diagrams in this paper are NOT necessarily drawn to scale. The last two pages of this question paper contain a list of data, formulae and relationships which you may find useful. INSTRUCTIONS FOR SECTION A (MULTIPLE-CHOICE QUESTIONS) (1) ©) (6) Read carefully the instructions on the Answer Sheet. After the announcement of the start of the examination, you should first stick a barcode label and insert the information required in the spaces provided. No extra time will be given for sticking on the barcode label after the ‘Time is up’ announcement. When told to open this book, you should check that all the questions are there. Look for the words ‘END OF SECTION A’ after the last question. All questions carry equal marks. ANSWER ALL QUESTIONS. You are advised to use an HB pencil to mark all the answers on the Answer Sheet, so that wrong marks can be completely erased with a rubber. You must mark the answers clearly; otherwise you will lose marks if the answers cannot be captured. You should mark only ONE answer for each question. If you mark more than one answer, you will receive NO MARKS for that question. No marks will be deducted for wrong answers. 2024-DSE-PHY 1A-1 1

What physical quantity does the shaded area represent in the above velocity-time (v-1) graph ? A. acceleration B. change of velocity C. momentum D. displacement 5 \Od\\‘i WHe horizontal A block of mass m slides down along a fixed rough incline with constant velocity as shown. The incline makes an angle 6 with the horizontal. What is the magnitude of the force exerted on the incline by the block ? A. Zero B. mg C. mg sind D. mg cosf 6. An object of weight w is placed inside an elevator of weight /7. T A force T pulls the elevator upward. A supporting force X acts on the object while the floor of the elevator experiences a force Y due to the presence of the object. Which of the ‘ following is an action and reaction pair ? ele_va“’r of X weight W A. T and (W+w) object of A B. wand X weight w T C. Xand Y D. It cannot be determined as the direction of acceleration of the elevator is unknown. Vy 2024-DSE-PHY 1A-3 3 | Goontothenextpage>
7. In an experiment, a horizontal force F acts on a block placed on a rough horizontal surface as shown in Figure (a). Figure (b) shows the variation of the block’s kinetic energy £; with the distance s it travelled. Neglect air resistance and assume frictional force unchanged. Ex N r > rough horizontal surface A A A 0 s Figure (a) Figure (b) If the experiment is repeated with force F doubled, which of the following graphs represents the expected result (in dotted line) ? A. B. Ex E; N N\ ’ ’ _ / - 7’ - ’ - 7’ - I - - - a7 ~ ~ 0 s 0 s C D. Ek Ek A v / ’ s ’ ’ ’ 4 - s _ - ,/ . ’ P ’ _ - z N 0 s 0 s 8. Block X and Y of mass 3.0 kg and 1.0 kg respectively are connected by a light inextensible string passing over a smooth light pulley fixed to the ceiling as shown. The blocks are released from rest. Find the time taken for block X to reach the ground. Neglect air resistance. ceiling ~_— pulley Y l fi._ofa ground 0.55s 0.64 s 0.68 s Sow> 0.78 s 2024-DSE-PHY 1A-4 4