0625_w16_qp_32
A paper of Physics, 0625
Questions:
12
Year:
2016
Paper:
3
Variant:
2
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1
is an incomplete graph that shows the motion of an object. The axes labels are incomplete. m / s / s A B C D E On , complete the label on each of the axes. Identify the part of the graph which shows the greatest acceleration. Tick one box. A to B B to C C to D D to E Calculate the distance travelled by the object between points C and D. distance = m Another object starts from rest at the same time as the object shown by the graph in . This object has constant acceleration for 10 s. After 10 s it moves at 8.0 m / s. On , draw a line to show the motion of this object between 0 and 10 s.
1. Motion, forces and energy  →  1.2. Motion
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2
shows a block of wood. 5.0 cm 5.0 cm 10.0 cm (not to scale) A student measures the mass of the block. He then measures the length of each side, as shown in . State the names of the measuring instruments used by the student. 1. 2. Calculate the volume of the block of wood. volume = cm3 The block of wood shown in has a mass of 200 g. Calculate the density of the wood. density = g / cm3 The table shows the densities of five liquids. liquid density g / cm3 does the block float? alcohol 0.75 freon 1.37 glycerol 1.13 petrol 0.72 sea water 1.02 Indicate the liquids on which the block of wood will float by placing ticks (3) in the final column.
1. Motion, forces and energy  →  1.4. Density
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3
shows a child and an adult on a see-saw. 1.4 m 0.6 m 300 N W pivot The see-saw shown in is in equilibrium. Tick the box alongside any correct statement. The resultant force on the see-saw is zero. The resultant turning effect on the see-saw is zero. Calculate the moment of the child about the pivot. moment = N m Calculate the weight W of the adult. weight = N State what would happen if the child moved further away from the pivot.
1. Motion, forces and energy  →  1.5.2. Turning effect of forces
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4
shows a student standing on soft sand. The student does not sink into the sand. soft sand The student has a mass of 40 kg. Calculate the force of her body acting on the sand. force = N The total area of both her shoes in contact with the sand is 0.02 m2. Calculate the pressure the student exerts on the sand, when standing as shown in . pressure = N / m2 The student lifts one foot off the sand. The other foot sinks into the sand. Explain why this happens. A calculation is not required.
1. Motion, forces and energy  →  1.8. Pressure
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5
shows an electrical heater placed so that it is the same distance from two cans. shiny silver can with water lid lid dull black can with water thermometers electrical heater The cans are the same size and contain equal volumes of water, initially at the same temperature. Energy travels to the cans from the heater. State the name of this process. Both cans are heated by the process in for 20 minutes. Compare the temperature of the water in the two cans at the end of the 20 minutes. Explain your answer. Some water is spilt on the bench when the cans are filled. At the end of the experiment the bench is dry. State what happened to the water on the bench and explain the process in terms of the water molecules.
2. Thermal physics  →  2.2.3. Melting, boiling and evaporation
2. Thermal physics  →  2.3.4. Consequences of thermal energy transfer
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7
shows how a fishing boat uses ultrasound to locate fish. sea surface fish sound wave returned sound wave sent out The boat sends out a pulse of ultrasound. The pulse reflects off the fish and returns to the boat. The time between sending and receiving the pulse is 0.3 s. The speed of sound in sea water is 1500 m / s. Calculate the distance from the boat to the fish. distance = m Tick the box alongside the correct statement for ultrasound. The frequency of ultrasound is less than 20 Hz. The frequency of ultrasound is between 20 Hz and 2000 Hz. The frequency of ultrasound is between 2000 Hz and 20 000 Hz. The frequency of ultrasound is more than 20 000 Hz. Ultrasound is not part of the electromagnetic spectrum. State the name of a wave that forms part of the electromagnetic spectrum.
3. Waves  →  3.4. Sound
3. Waves  →  3.3. Electromagnetic spectrum
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9
shows a laptop and a charger. The charger contains a step-down transformer. charger laptop Explain the function of a step-down transformer. State the name of the material from which the two coils of the transformer are made. The transformer has an input voltage of 240 V and an output voltage of 12 V. There are 10 000 turns on the input coil. Calculate the number of turns on the output coil. number of turns = Electricity is transmitted at high voltages. State two advantages of transmitting electricity in this way. 1. 2.
4. Electricity and magnetism  →  4.5.6. The transformer
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10
shows a simplified circuit diagram for a fan-assisted electric oven. The fan is driven by a motor. component X power supply M On , circle the symbol representing the heater. includes a variable resistor. State the function of a variable resistor. Suggest how using a variable resistor can affect the heater. The potential difference across the motor is 250 V. The current in the motor is 2.0 A. Calculate the resistance of the motor. resistance = Ω State the name of component X and explain how it contributes to the safety of the user. name of component X explanation
4. Electricity and magnetism  →  4.2.4. Resistance
4. Electricity and magnetism  →  4.3.1. Circuit diagrams and circuit components
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11
shows a relay. contacts pivot iron armature circuit switch X circuit high-voltage a.c. supply motor Y M The relay is used to switch on the motor in the high-voltage circuit 2. Circuit 1 uses direct current (d.c.). State what is meant by direct current. State a suitable material for Y and explain why it is made from this material. material explanation Closing switch X in circuit 1 results in a current in circuit 2. Use to explain why this happens. Circuit 2 requires thicker wires than the wires in circuit 1. Suggest why circuit 2 needs thicker wires.
4. Electricity and magnetism  →  4.5.3. Magnetic effect of a current
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12
Carbon-14 is a radioactive element. Describe what is meant by the term radioactive. The radioactive decay curve for carbon-14 is shown in . count rate counts / min time / years 10 000 15 000 20 000 25 000 30 000 Complete the table using information from . The first value has been done for you. count rate counts / minute time / years Determine the half-life of carbon-14. half-life = years A radioactive iodine isotope has a half-life of 8 days. A sample contains 10 g of this iodine isotope. Calculate the mass of the iodine isotope remaining in the sample after 16 days. mass remaining = g State one safety precaution taken by people who use radioactive sources.
5. Nuclear physics  →  5.2.4. Half-life
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