0625_s18_qp_33
A paper of Physics, 0625
Questions:
12
Year:
2018
Paper:
3
Variant:
3
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1
A student watches a car race around a track. He uses a stopwatch to measure the time for the car to make one lap of the track. The student forgets to reset the stopwatch at the start of the race. shows the time on the stopwatch at the start and the time after going around the track once. time at start time after going around the track once 01:22. min s s 02:33. min s s Calculate the time the car takes to go around the track once, in seconds. time = s The length of the track is 4.0 km. The car goes around the track 20 times. The car takes 26 minutes and 40 seconds to complete the 20 laps. Calculate the average speed of the car in m / s. average speed = m / s shows a speed-time graph for the car during part of the race. 20.0 5.0 10.0 15.0 20.0 25.0 time / s 30.0 35.0 40.0 speed m / s 60.0 80.0 P Q R S T V State the section of the graph that shows the greatest acceleration. Explain your answer. Calculate the distance travelled by the car during the first 2.5 seconds. distance = m
1. Motion, forces and energy  →  1.2. Motion
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2
A student is using some 50 g masses. Calculate the weight of one 50 g mass. weight of 50 g mass = N The student uses the 50 g masses as loads to stretch a spring. shows the apparatus the student uses to obtain readings for a load-extension graph. 50 g masses 50 g mass hanger spring stand rule pin (NOT to scale) Describe how the student could use the apparatus and ensure that the readings are accurate.
1. Motion, forces and energy  →  1.5.1. Effects of forces
1. Motion, forces and energy  →  1.3. Mass and weight
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3
The mass of a small steel ball is 120 g. The volume of the ball is 16.0 cm3. Calculate the density of the steel ball. density = g / cm3 The ball falls to the ground from rest. At a time of 0.2 s after it started to fall, its acceleration is 10 m / s2. State the acceleration of the ball at a time of 0.1 s after it started to fall. shows the vertical forces that act on a large plastic ball as it is falling. 0.3 N 1.2 N large plastic ball (not to scale) State the name given to each of the forces shown in . 1. 2. Calculate the size of the resultant force on the ball. resultant force = N
1. Motion, forces and energy  →  1.2. Motion
1. Motion, forces and energy  →  1.3. Mass and weight
1. Motion, forces and energy  →  1.5.1. Effects of forces
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5
shows a metal can containing air. The can is sealed with a lid. can lid The air in the can exerts a pressure of 20 000 N / m2 on the lid. The area of the can lid is 0.09 m2. Calculate the force on the lid due to the air in the can. force = N The air in the can becomes warmer. State and explain what happens to the pressure of the air in the can. Use your ideas about gas molecules.
1. Motion, forces and energy  →  1.8. Pressure
2. Thermal physics  →  2.1.3. Gases and the absolute scale of temperature
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6
A student investigates the thermal energy lost from two metal cans, X and Y. The cans are identical apart from their outside colour. The student pours the same volume of hot water into each can and seals each can. The student records the temperature of the water in each can at regular time intervals for a period of 35 minutes. The equipment is shown in . hot water hot water can X can Y thermometer thermometer is a graph of the results from the investigation. 5.0 10.0 15.0 20.0 25.0 30.0 time / minutes temperature / °C 35.0 can X can Y For can X, use to determine the drop in temperature of the water in the first five minutes in the last five minutes. Explain why the water cools at a greater rate during the first five minutes of the experiment, compared with the last five minutes. The outside of one can is dull black and the outside of the other is shiny white. State the colour of can Y. Explain your answer.
2. Thermal physics  →  2.2.3. Melting, boiling and evaporation
2. Thermal physics  →  2.2.1. Thermal expansion of solids, liquids and gases
2. Thermal physics  →  2.3.4. Consequences of thermal energy transfer
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7
shows an incomplete diagram of the electromagnetic spectrum. 1m wavelength / m 10−1 10−2 10−3 10−4 10−5 10−6 10−7 10−8 10−9 10−10 10−12 γ-rays X-rays infra-red ultraviolet microwaves B A 10−13 10−11 In , section A and section B of the electromagnetic spectrum are not labelled. State the names of these parts. A B An electromagnetic wave has a wavelength of 1.0 × 10–9 m. Use to identify the type of electromagnetic wave. All electromagnetic waves travel at the same speed in a vacuum. State one other property that is the same for all electromagnetic waves. For each purpose, state one type of electromagnetic radiation that can be used. remote controllers for televisions killing bacterial cells
3. Waves  →  3.3. Electromagnetic spectrum
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10
shows an electrical circuit. V 12 V power supply A X R State the name for the component labelled X and state its function in this circuit. name for component function Describe how the circuit shown in could be used to find the resistance of the fixed resistor R. An electrical heater has a resistance of 21.8 Ω when connected to a 240 V mains supply. Calculate the current in the heater. current = A Suggest a rating for the fuse to be fitted to the mains plug for the heater. fuse rating = A
4. Electricity and magnetism  →  4.3.3. Action and use of circuit components
4. Electricity and magnetism  →  4.2.4. Resistance
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11
shows a coil wrapped around a plastic tube. There is a current in the coil. The arrows show the direction of the current in the coil. plastic tube On , draw the pattern of the magnetic field lines around the coil. Add arrows to show the direction of the magnetic field. A long soft iron bar is placed inside the plastic tube. There is a current in the coil. This forms a device. State the name of the device. shows a relay operated by switch S. pivot soft iron armature soft iron core S coil of wire insulator springy metal B A contacts M Using , describe how closing the switch, S, causes the electric motor to operate.
4. Electricity and magnetism  →  4.5.3. Magnetic effect of a current
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12
shows a diagram to represent a helium atom, and an incomplete key. proton key Complete the key in . State the name of each particle. The table in compares two isotopes of helium. 2He 2He number of protons number of neutrons For each isotope, write the number of protons and the number of neutrons in the correct places in the table. The nucleus of the helium atom in is the same as an α-particle. Describe the penetrating ability of α-particles. Explain why it is dangerous to swallow a source that emits α-particles.
5. Nuclear physics  →  5.1.2. The nucleus
5. Nuclear physics  →  5.2.3. Radioactive decay
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