0625_w11_qp_21
A paper of Physics, 0625
Questions:
12
Year:
2011
Paper:
2
Variant:
1
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2
Two girls attempt to measure the speed of the water in a river, as shown in . bridge 1 bridge 2 50 m The distance between the two bridges is measured as 50 m. Suggest an appropriate instrument that they might use to measure this distance. The girl on bridge 1 drops a piece of wood into the water. The girl on bridge 2 measures how long it takes for the piece of wood to reach bridge 2. It takes 400 s to travel between the two bridges. Name an appropriate instrument that could be used to measure this time. Describe the procedure for measuring this time. Calculate the speed of the water. speed =
3. Waves  →  3.4. Sound
1. Motion, forces and energy  →  1.2. Motion
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3
In a laboratory experiment to find the centre of mass of a triangular piece of card, the card is suspended first from point A and then from point B, as shown in Figs. 3.1 and 3.2. A B D E C C D B A E When suspended from A, point D is found to be vertically below A. When suspended from B, point E is vertically below B. What piece of apparatus might be used to determine the vertical lines through A and B? On below, draw construction lines to find the position of the centre of mass of the triangular card. Label this point clearly with the letter G. C D B A E illustrates a toy that always returns to the upright position, whatever position it is put in to start with. On one of the three positions of the toy shown in , clearly mark X at a possible position for the centre of mass of the toy.
1. Motion, forces and energy  →  1.5.3. Centre of gravity
1. Motion, forces and energy  →  1.5.2. Turning effect of forces
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4
In , the smoke cell consists of an illuminated glass box into which some smoke has been injected. microscope smoke cell light Describe briefly what is seen when the contents of the smoke cell are viewed through the focused microscope. State the name we normally give to what is seen. What deductions about the properties and behaviour of air molecules can be made from these observations?
2. Thermal physics  →  2.1.3. Gases and the absolute scale of temperature
2. Thermal physics  →  2.2.1. Thermal expansion of solids, liquids and gases
2. Thermal physics  →  2.2.3. Melting, boiling and evaporation
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6
The list below contains the names of the various regions of the electromagnetic spectrum, but they are in the wrong order and an extra, non-electromagnetic type of wave motion has been included. infra-red radiation X-rays gamma rays visible light radio waves ultrasound waves ultra-violet radiation Which one of these is not electromagnetic? In the boxes below, list the various regions of the electromagnetic spectrum in order of wavelength. The first and last boxes have been filled in for you. radio waves gamma rays Which of these has the longest wavelength? Which of these produces a significant heating effect? Which of these may be used to obtain a picture of a broken bone inside the body?
3. Waves  →  3.3. Electromagnetic spectrum
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8
A student learning about electric circuits connects up the circuit shown in . battery ammeter coil of wire variable resistor AMPS 4 5 The student has already made one mistake with his connections. What is his mistake? In the space below, draw the circuit diagram of the arrangement shown in , using standard symbols. The student now connects a voltmeter to the circuit, so that readings can be taken to find the resistance of the coil of wire. On your circuit diagram, draw the voltmeter, connected to measure the potential difference across the coil. Having obtained a correctly-working circuit, the readings on the two meters for one setting of the variable resistor are as shown in Figs. 8.2 and 8.3. AMPS VOLTS Record these two readings. ammeter reading = A voltmeter reading = V The slider on the variable resistor (see ) is moved a small distance to the left, reducing its resistance. State what happens to the readings on the two meters. ammeter reading voltmeter reading The slider is adjusted so that the total resistance in the circuit is double that which gave the readings in Figs. 8.2 and 8.3. Calculate the new values of the readings on the meters. ammeter reading = A voltmeter reading = V
4. Electricity and magnetism  →  4.2.4. Resistance
4. Electricity and magnetism  →  4.2.3. Electromotive force and potential difference
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9
The circuit symbol shown in represents a device often used in electrical equipment. State the name of this device. shows, in simplified form, the essential parts of a grid system for distributing electrical energy from a power station to domestic consumers. The device in part is used both at X and at Y. power station X 22 000 V 132 000 V transmission cables and pylons 240 V domestic consumer Y Using information from , deduce the ratio secondary turns primary turns necessary at X and at Y. turns ratio at X = turns ratio at Y = State two reasons why power transmission is cheaper if the voltage across the cables is very high. 1. 2.
4. Electricity and magnetism  →  4.5.6. The transformer
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10
Complete the following statement about an electric field. An electric field is a region in which experiences a shows two identical light uncharged balls suspended on thin nylon threads. nylon thread ball B A Ball A is given a positive charge and ball B is given a negative charge. In the space below, draw a diagram showing the positions that the balls and threads will take, now that the balls are charged. On ball B in your diagram, use labelled arrows to show the directions of the electrostatic force on the ball (label it E), the weight of the ball (label it W), the tension force of the thread on the ball (label it T). Ball B is in equilibrium. State the value of the resultant of forces E, W and T. resultant =
4. Electricity and magnetism  →  4.2.1. Electric charge
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11
shows a tube that can be used to produce cathode rays. Metal plates above and below the tube have zero potential difference between them. On , clearly label the filament cathode (label it C), the anode (label it A). On , draw a battery (label it B), connected to cause thermionic emission of electrons, a 1000 V power supply (label it P), connected to cause a beam of cathode rays along the tube, the path of the beam of cathode rays along the tube. What is seen when the beam of cathode rays hits the screen? A high potential difference is now connected between the two metal plates, so that the lower plate is positive and the upper plate is negative. What change is seen on the screen?
4. Electricity and magnetism  →  4.2.4. Resistance
4. Electricity and magnetism  →  4.5.1. Electromagnetic induction
4. Electricity and magnetism  →  4.5.3. Magnetic effect of a current
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12
The count-rate from a sample of radioactive material is investigated by a team of scientists in a laboratory. With the radioactive sample in place, the count-rate from the sample is determined every 7 days, with the results shown below. The background count-rate has already been subtracted. time / days count-rate counts / s On , plot a graph of count-rate from the sample against time. time / days count-rate counts / s From your graph, find the time at which the count-rate is 1. 800 counts / s, days 2. 200 counts / s. days From the figures in , find the value of the half-life of the substance. half-life = days
5. Nuclear physics  →  5.2.1. Detection of radioactivity
5. Nuclear physics  →  5.2.4. Half-life
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