Free CXC Physics Paper 2 January 2020 past paper from 2020. Includes a worked answer key. Open the PDF, take a timed test, and study with AI on Caribbean AI.
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CSEC Physics Paper 2 January 2020 - Free CXC Past Paper with Answers
Free CXC Physics Paper 2 January 2020 past paper from 2020. Includes a worked answer key. Open the PDF, take a timed test, and study with AI on Caribbean AI.
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Every question from this paper as text. See the answers and worked solutions. Questions are the property of the Caribbean Examinations Council; Caribbean AI is not affiliated with CXC.
A sprinter of mass 55 kg was running a 100 m race. Her velocity was measured at different intervals of a 11.0 s period. The results are recorded in Table 1.
TABLE 1: RESULTS
| Velocity, | 0.00 | 1.20 | 3.75 | 8.75 | 10.00 | 10.00 |
|---|---|---|---|---|---|---|
| Time, |
| 0.0 |
| 1.0 |
| 3.0 |
| 7.0 |
| 8.0 |
| 11.0 |
[25 marks]
Define the term 'velocity'.
[2 marks]
Complete the following statement.
Acceleration is defined as the rate of change of 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<![CDATA[Using the grid provided **on page 5**, plot a graph of velocity, v/ms⁻¹ against time, t/s.[1 mark]
Using the grid provided on page 5, plot a graph of velocity, against time, .
[8 marks]
Determine the slope of the graph over the first 7.0 s of the race.
[4 marks]
State the physical quantity relating to the motion of the sprinter which the slope of the graph represents.
[1 mark]
Describe the sprinter's motion from 8 s to 10 s.
[1 mark]
Calculate the resultant force acting on the sprinter after 7.0 s.
[3 marks]
Using the graph drawn on page 5, determine how far from the finish line the sprinter would be after 11.0 s.
[5 marks]
This question is about specific heat capacity and latent heat.
Define EACH of the following terms:
[6 marks]
Specific heat capacity
[3 marks]
Specific latent heat of fusion of ice
[3 marks]
A block of ice, which has a mass of 2.5 kg and a temperature of , is placed in a container.
Calculate
[5 marks]
the heat energy required to change the temperature of the ice at to ice at .
[3 marks]
the heat energy required to convert all the ice at to water at .
[2 marks]
The water in the container is now heated to a temperature of by an electrical heater, in 600 seconds.
[4 marks]
Calculate the power output of the heater.
[3 marks]
State ONE assumption which must be taken into account in (c) (i).
[1 mark]
This question is about linear momentum.
Define the term 'linear momentum'.
[1 mark]
State the SI unit for linear momentum.
[1 mark]
State the law of conservation of linear momentum.
[3 marks]
State TWO real-life examples that demonstrate the law of conservation of linear momentum.
[2 marks]
Trolley A and Trolley B collided head-on. Trolley A of mass 72.0 kg was moving towards the west at . Trolley B of mass 69.4 kg was moving towards the east at . Calculate:
[4 marks]
Trolley A and Trolley B collided head-on. Trolley A of mass was moving towards the west at . Trolley B of mass was moving towards the east at . Calculate the initial momentum of Trolley A
the initial momentum of Trolley B.
[2 marks]
Assuming the trolleys locked during the collision and that they moved off together in one direction, determine the speed and the direction of the joined trolleys immediately after the collision.
[4 marks]
With the aid of a labelled diagram, state the TWO laws of refraction.
Law 1 Law 2
[4 marks]
When a diver under the sea shines a beam of light towards the surface of the water, the light does not pass through the water-air boundary into the air above but reflects into the sea.
State the name of the phenomenon which occurs and briefly explain why it occurs.
[2 marks]
Another diver shines a beam of light into the water to see some fishes as shown in Figure 2.
Given that the index of refraction for the water is 1.33 and the angle of incidence, , calculate the angle of refraction, .
[3 marks]
An object 2 cm in height, is placed 10 cm in front in a converging lens with a focal length, , of 6 cm. Calculate (i) the image distance, . (4 marks) (ii) the linear magnification, . (2 marks)
[6 marks]
the image distance, .
[4 marks]
the linear magnification, .
[2 marks]
Complete Table 2 by inserting the missing logic gates, symbols and functions.
TABLE 2: LOGIC GATES, SYMBOLS AND FUNCTIONS
| Logic Gate | Symbol | Function |
|---|---|---|
| Changes logic 0 to logic 1 | ||
| AND | ||
| OR | ||
| NAND | Produces a logic 1 only when A and B are logic 0 |
[6 marks]
With the aid of a circuit diagram, describe how an alternating current (a.c.) can be half-wave rectified to produce a direct current across a resistor (load).
[5 marks]
With the aid of a circuit diagram, describe how an alternating current (a.c.) can be half-wave rectified to produce a direct current across a resistor (load).
[5 marks]
Sketch the voltage-time graph to show the expected output across the load in (b) (i).
[1 mark]
Draw a voltage-time graph showing an a.c. source with a frequency of 5 Hz and a peak voltage of 12 V. Figure 4. Voltage-time graph showing an a.c. source
[3 marks]
Three emissions, , , , from a radioactive source are subjected to a uniform magnetic field perpendicular to their path, as shown in Figure 5.
(i) Draw the three rays to represent the path of EACH of the three emissions, , , , on Figure 5, as they pass through the magnetic field. (ii) The magnetic field is replaced by an electric field as shown in Figure 6. Draw the three rays to represent the path of EACH of the three emissions, , , , on Figure 6, as they pass through the electric field.
[6 marks]
Three emissions, , , , from a radioactive source are subjected to a uniform magnetic field perpendicular to their path, as shown in Figure 5. Draw the three rays to represent the path of EACH of the three emissions, , , , on Figure 5, as they pass through the magnetic field. Figure 5. Radioactive source in a uniform magnetic field
The magnetic field is replaced by an electric field as shown in Figure 6. Draw the three rays to represent the path of EACH of the three emissions, , , , on Figure 6, as they pass through the electric field. Figure 6. Radioactive source in an electric field
[3 marks]
An unstable isotope of lead, , undergoes exactly two sequential beta particle decays followed by an alpha particle decay to become stable lead, .
Calculate the energy given off in a nuclear reaction if the change in mass is . (, )
[2 marks]
[3 marks]
With reference to the information in Table 3, write the nuclear equations that will result in the formation of stable lead, from .
| Element | Atomic Number |
|---|---|
| Bi | 83 |
| Po | 84 |
First beta decay equation Second beta decay equation Alpha decay equation
[6 marks]
[3 marks]