0625_m15_qp_22
A paper of Physics, 0625
Questions:
12
Year:
2015
Paper:
2
Variant:
2
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3
A microphone is a device designed to convert an input of sound energy into an output of electrical energy. Complete the table below. In each case, give the name of a device that is designed to give the stated energy output with the stated energy input. energy input useful energy output device sound electrical microphone electrical sound chemical electrical electrical thermal electrical kinetic The electrical energy output from the microphone is less than the sound energy input. State the principle of conservation of energy. Explain how this principle applies to the microphone.
1. Motion, forces and energy  →  1.7.1. Energy
4. Electricity and magnetism  →  4.2.5. Electrical energy and electrical power
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5
A ray of light in glass meets a boundary with air. In , the three diagrams X, Y and Z each show a different angle of incidence for the ray. glass air ray X glass air Y glass air Z Write down the letter of any diagram, X, Y or Z, in which the ray undergoes 1. refraction, 2. total internal reflection. On , use the letter C to mark the critical angle for light at the glass-air boundary. Water waves move more slowly in shallow water than in deep water. shows wavefronts of a wave in deep water meeting the boundary with some shallow water. wave moves in this direction wavefronts deep water shallow water Using your ruler, carefully complete the wavefronts 1, 2 and 3, showing their possible positions in the shallow water where they move more slowly. Tick the one box that describes what is happening at the boundary. diffraction echo refraction total internal reflection
3. Waves  →  3.2.2. Refraction of light
3. Waves  →  3.1. General properties of waves
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6
Two students A and B are carrying out an experiment to determine the speed of sound. They are standing side by side at a distance of 480 m from the school wall, as shown in . A 480 m school wall B (not to scale) Student A makes a loud sound by banging two pan lids together once. A short time later, both students hear the sound again. State what causes this second sound. Underline the phrases that correctly complete the sentences below. louder than The second sound is equally as loud as the original sound. quieter than amplitude frequency changed. This is because the of the sound has speed not changed. wavelength The time between the two sounds, as measured by student B, is 3.0 s. Suggest the instrument that student B used to measure the time. Use the measurements to calculate the speed of sound. speed = m / s
3. Waves  →  3.4. Sound
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7
The electric circuit in consists of a battery, two lamps and a switch. A voltmeter is connected across one of the lamps. V 12 V A B Which quantity does the voltmeter measure? Tick one box. charge current potential difference power The switch is closed so that there is a current in the lamps. What flows in the circuit in order to create the current? Tick one box. charge potential difference power resistance The resistance of each lamp is 18 Ω. Calculate 1. the combined resistance of the lamps, combined resistance = Ω 2. the current in the circuit, stating the unit in your answer. current = Calculate the value of the reading on the voltmeter. voltmeter reading = V Suggest one disadvantage of connecting lamps in series rather than in parallel.
4. Electricity and magnetism  →  4.3.2. Series and parallel circuits
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8
When materials are heated, they usually expand. Describe one example where the expansion is useful, the expansion causes problems that need to be allowed for. State two things that happen to the molecules of a solid when it is cooled. 1. 2. shows some balloons that have been filled with gas and tied to a heavy box. heavy box In the sunlight, the gas in the balloons gets warmer. State what is seen to happen to the balloons. In terms of molecules, explain your answer to .
2. Thermal physics  →  2.2.1. Thermal expansion of solids, liquids and gases
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10
Complete the three sentences below, to describe attraction and repulsion in electrostatics. Two positive charges . Two negative charges . A positive charge and a negative charge . A positive charge and an uncharged conductor . A charged plastic sphere is hanging on an insulating thread. When a negatively-charged rod is brought near, the sphere and thread move to the position shown in . – rod insulating thread charged sphere – – – – – – – – – – – – State the sign of the charge on the sphere. Describe what happens to the sphere and thread when the rod is moved far away from them. State the name of a material that is an electrical conductor.
4. Electricity and magnetism  →  4.2.1. Electric charge
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11
shows how the count rate from a radioactive source varies with time. time / s count rate counts / s Using , describe how the count rate changes with time. Using , determine how many seconds it takes for the count rate to change from 60 counts / s to 15 counts / s. number of seconds = State the number of half-lives in this time. number of half-lives = Calculate the half-life of the radioactive substance. half-life = s State the time taken for the count rate to change from 10 counts / s to 5 counts / s. time = s Question 12 is on the next page.
5. Nuclear physics  →  5.2.1. Detection of radioactivity
5. Nuclear physics  →  5.2.4. Half-life
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