0625_w14_qp_22
A paper of Physics, 0625
Questions:
12
Year:
2014
Paper:
2
Variant:
2
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1
Which two conditions apply for an object on Earth to be in equilibrium? Tick two boxes. there are no forces acting on the object the object has no mass there is no resultant force on the object there is no resultant moment is a simplified diagram of a balance with equal arms. A copper block of unknown mass is placed on the left-hand pan. Six standard masses, placed on the right-hand pan, cause the balance to be in equilibrium, with the beam horizontal. The six standard masses on the right-hand pan are: 100 g, 100 g, 50 g, 10 g, 5 g, 2 g What is the mass of the copper block? mass = g What will be seen to happen if the 2 g mass is removed from the right-hand pan? The volume of the copper block is 30 cm3. Calculate the density of copper. State the unit in your answer. density =
1. Motion, forces and energy  →  1.5.2. Turning effect of forces
1. Motion, forces and energy  →  1.3. Mass and weight
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2
A car travels along a straight, horizontal road at a steady speed of 36 m / s. The total resistive force on the car is 2800 N, as represented on . 2800 N 36 m / s resistive force driving force The speed of the car is constant at 36 m / s. What is the value of the driving force? driving force = N Later in the journey, the car’s speed decreases uniformly from 36 m / s to zero in 18 s. On the axes in , sketch the speed-time graph for the motion of the car during these 18 s. Mark 36 m / s and 18 s clearly on your graph. time / s speed m / s Determine the distance travelled by the car in these 18 s. distance = m
1. Motion, forces and energy  →  1.2. Motion
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4
Some water forms a shallow puddle on a metal surface in a laboratory, as shown in . puddle of water metal surface Later in the day, it is noticed that the puddle has disappeared and the metal surface is dry. Which process has caused the disappearance of the puddle? Tick one box. boiling condensation evaporation freezing In terms of molecules, describe how this process occurs. When this process occurs, it causes cooling. In terms of molecules, explain why this cooling occurs.
2. Thermal physics  →  2.2.3. Melting, boiling and evaporation
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5
Here are some statements about forces. Some statements are correct. Put a tick () in the box alongside each of these. Other statements are false. Put a cross () in the box alongside each of these. On Earth, an object has weight due to a force acting towards the Earth. Work is done when an object moves in the direction of the force acting on it. When a single force acts on an object, it moves at constant speed. If the only forces acting on an object are two equal and opposite forces in the same straight line, then the object is in equilibrium. An object at rest always has no forces acting on it.
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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6
A laboratory liquid-in-glass thermometer has a range from –10 °C to 110 °C. Describe what you would do to check the accuracy of the 0 °C mark on the thermometer, the 100 °C mark on the thermometer. The temperature of some water is reduced to –10 °C. In which state is the water at this temperature? The measurement of temperature can be carried out using any physical property that changes with temperature. Two examples are given below. the volume of a liquid the resistance of a wire Add two more examples. You may re-use words from the examples if you wish, but you do not have to do so. 1. the of 2. the of
2. Thermal physics  →  2.2.3. Melting, boiling and evaporation
2. Thermal physics  →  2.1.3. Gases and the absolute scale of temperature
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7
Four school athletes are about to run a 100 m race, as shown in . 100 m winning line B A timekeeper starting pistol starter (not to scale) The runners start at A, when the starter fires the starting pistol, and they finish at B. Suggest what equipment the groundsman used when he measured out the 100 m before marking the track, the timekeeper uses to time how long the runners take to run the 100 m. The timing instrument is known to work correctly. What might cause the timekeeper to introduce an inaccuracy into the timing of the race? The winner takes 12.5 s to run the race. Calculate the average speed of the winner. average speed = m / s Suggest one reason why the average speed of the winner is less than his top speed. On another occasion, the starter and timekeeper decide to measure the speed of the sound from the gun. They use the same equipment they used to time the race. Suggest how far apart they should be. Suggest how the timekeeper would know when to start timing.
1. Motion, forces and energy  →  1.2. Motion
3. Waves  →  3.4. Sound
1. Motion, forces and energy  →  1.1. Physical quantities and measurement techniques
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8
shows a section through the swimming pool in a hotel. To make the pool more attractive at night, there are submerged lamps in the pool. shows three rays coming from one of these lamps. 40° 50° 30° air water lamp B A The critical angle for the water/air boundary is 48 °. State what is meant by the critical angle for a ray of light. On , use your ruler to draw approximate paths for the rays after they reach the surface at A and B.
3. Waves  →  3.2.2. Refraction of light
3. Waves  →  3.2.1. Reflection of light
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9
Which electrical quantity does a voltmeter measure? Tick one box. current potential difference power resistance The transformer in has 600 turns on its primary coil AB, and 400 turns on its secondary coil CD. A B C D primary coil 600 turns secondary coil 400 turns iron core AB is connected to a 120 V alternating mains supply. An a.c. voltmeter is connected across CD. Calculate the reading on the voltmeter. voltmeter reading = V A large number of cells are connected in series, to make a 120 V battery. The mains supply is disconnected from AB, and the 120 V battery is connected in its place. 1. State the voltage across CD. 2. Explain your answer.
4. Electricity and magnetism  →  4.5.6. The transformer
4. Electricity and magnetism  →  4.2.3. Electromotive force and potential difference
4. Electricity and magnetism  →  4.2.4. Resistance
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10
A student is attempting to measure the resistance of a resistor R. To do this, she connects the circuit of . R E S The letter E on represents the electromotive force (e.m.f.) of the battery. In which unit is E measured? The circles on represent a voltmeter and an ammeter. Write V and A in the appropriate circles, to show which meter is which. The battery cannot be changed. Write down the label of the component that is used to vary the current in the circuit. What is this component called? The table below gives the readings obtained by the student for different currents. ammeter reading / A 0.20 0.30 0.50 0.75 1.00 voltmeter reading / V 1.15 1.65 2.65 4.10 5.55 On , draw a graph of these values. The first two points have been plotted for you. 0.2 0.4 0.6 ammeter reading / A voltmeter reading / V 0.8 1.0 Use your graph to find a value for the resistance of R. resistance = Ω
4. Electricity and magnetism  →  4.2.4. Resistance
4. Electricity and magnetism  →  4.3.3. Action and use of circuit components
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11
The radiation detector and counter in are being used to count particles from a radioactive source. counter radiation detector Y X Each time the counter is used to make a measurement, it is first reset to zero and then left switched on for 3 minutes. With no radioactive source anywhere near the radiation detector, after being switched on for 3 minutes the reading on the counter is 85 counts. Suggest what radiation caused this reading. A radioactive source emitting β-particles is placed at X. After 3 minutes, the counter reads 592 counts. Calculate the average count rate, in counts / min, from the radioactive source. count rate = counts / min The β-particle source is left at X and a block of aluminium 4 cm thick is placed at Y. Suggest what the counter would read on this occasion, after 3 minutes. Explain your answer to .
5. Nuclear physics  →  5.2.1. Detection of radioactivity
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12
is a very simple representation of the structure of an atom. – nucleus – – – + + + + The broken circle indicates the nucleus, and the particles inside this broken circle are the particles in the nucleus. Charged particles are marked + or –. Uncharged particles are shown as empty circles. State the number of neutrons in this atom. State the nucleon number of the atom, the proton number of the atom. What name is given to the negatively-charged particles?
5. Nuclear physics  →  5.1.1. The atom
5. Nuclear physics  →  5.1.2. The nucleus
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