CSEC Physics Paper 2 May/June 2024 - Free CXC Past Paper with Answers

Identify the types of lenses shown in Figure 1.

A student used the apparatus shown in Figure 2 to determine the focal length of a lens. She adjusted the position of the lens and screen to obtain a sharp image on the screen. She measured the image distance, $v$ , deduced the magnification, $m$ , of the object and recorded her results in Table 1 below.

TABLE 1: IMAGE DISTANCE, $v$ , AND MAGNIFICATION OF THE OBJECT,

v/cm	20	30	40	50	60	70	80
m	0.15	0.65	1.20	1.85	2.35	2.95	3.52

Using a scale of 2 cm to represent 0.50 on the y-axis, plot a graph of magnification, $m$ , against image distance, $v$ , on the grid provided on page 7.

Calculate the gradient, $G$ .

Given that $G = 1/f$ , calculate the focal length of the lens, $f$ .

Figure 4 shows a full-scale diagram of an object, $O$ , which has a height of 3 cm. The object is placed 8 cm in front of a diverging lens, $L$ .

Given that the focal length of the lens is 5 cm, draw the ray diagram in Figure 4 to find the image of the object.

Record the image distance.

State whether the image is real or virtual.

Figure 5 shows a bottle filled with water resting on the ground in three different positions, A, B and C.

Figure 5. Three different positions of a full bottle of water

State the type of equilibrium for EACH of the following. (i) Position A (ii) Position B (iii) Position C

Define the term 'moment of a force'. State its SI unit.

Figure 6 shows a uniform metre rule balanced horizontally on a fulcrum with a mass of 0.24 kg hanging from one end. [ $g = 10 \text{ N kg}^{-1}$ ]

Figure 6. A uniform metre rule

Calculate the weight of the 0.24 kg mass.

By taking moments, calculate the weight of the metre rule.

Calculate the magnitude of the force of the fulcrum acting on the metre rule.

Using arrows, match each mode of heat transfer to ONE correct description.

Figure 7 shows a section of a solar water heater which utilizes the greenhouse (glasshouse) effect in its operation.

Briefly describe the greenhouse (glasshouse) effect.

The energy absorbed from the sun by a solar water heater is $360 \text{ kJ}$ . Thirty-five per cent of the energy is transferred to $1.5 \text{ kg}$ of water in the pipes. Calculate the final temperature of the water if its initial temperature is $30 \text{ °C}$ .

[Specific heat capacity of water is $4200 \text{ J kg}^{-1} \text{ °C}^{-1}$ .]

Explain why the pipes (tubes) are made from copper.

SECTION B Answer ALL questions.

Figure 8 shows a circuit diagram with a low voltage power supply circuit which can be used to test whether a given material is a conductor or insulator.

Figure 8. Circuit diagram

Describe the procedure which would be used to test whether the material is a conductor.

Name ONE material which is an electrical conductor and ONE which is an insulator. Conductor Insulator

On the diagram in Figure 8, mark the direction of electron flow.

Figure 9 shows a circuit diagram which has a combination of four resistors and an ammeter, A.

Figure 9. Circuit diagram

Calculate the reading of the ammeter when the switch is

Calculate the power dissipated in the $1 \Omega$ resistor when the switch is closed.

Define the term 'electric field'.

Figure 10 represents the electric field between and around two charged objects.

Figure 10. An electric field State the type of charge at object A.

Explain how a polythene rod when rubbed with fur becomes negatively charged.

A magnetic relay is used to switch on a circuit carrying a large current. Figure 11 shows an electromagnet used in a magnetic relay to operate the starter motor of a car.

Figure 11. A magnetic relay Explain how the magnetic relay can be used to operate the starter motor in Figure 11.

Figure 12 shows a wire connected to a centre zero galvanometer. The wire is placed between the poles of a permanent magnet.

State what is observed on the galvanometer when the wire is moved in the direction shown by the arrows.

parallel to the magnetic field

upwards through the magnetic field

downwards through the magnetic field

A single nuclear fission reactor could produce most of the electricity requirements for many Caribbean countries.

State TWO arguments against building such a nuclear reactor in one of the larger islands of the Caribbean.

Give ONE argument to support the building of such a reactor to produce the electricity required for an island.

Define the term 'radioisotope'.

Radioisotopes have useful applications in the fields of medicine, agriculture and industry.

Choose TWO of the fields above and describe ONE useful application of radioisotopes in EACH.

The letters P, Q, R and Y represent five different nuclides. $_{\text{19}}^{\text{40}}\text{P}$ $_{\text{92}}^{\text{235}}\text{Q}$ $_{\text{92}}^{\text{238}}\text{R}$ $_{\text{19}}^{\text{40}}\text{Y}$

Determine

which nuclides have identical mass numbers

how many neutrons are in the heaviest nuclide

which pair of nuclides are isotopes.

In an experiment to determine the half-life of a radioactive isotope, the initial count rate of 16 000 counts per minute was recorded. After 100 seconds the new count rate was 1000 counts per minute.

Use the information given to calculate the half-life of the isotope.

CSEC Physics Paper 2 May/June 2024 Questions

Question 1 (25 marks)

Question 2 (15 marks)

Figure 5. Three different positions of a full bottle of water

Figure 6. A uniform metre rule

Question 3 (15 marks)

Question 4 (15 marks)

Question 5 (15 marks)

Question 6 (15 marks)