CSEC Physics Paper 2 January 2018 - Free CXC Past Paper with Answers

Complete Table 2 to distinguish among solids, liquids and gases using the terms 'definite/fixed', 'vibrate', 'move freely', 'very weak/negligibly weak', 'no fixed shape'.

TABLE 2

Students in a fifth form Physics class used the apparatus in Figures 3a and 3b in an experiment to find the specific latent heat of vaporization of water, $L_v$.

Figure 3a shows the initial readings as the water begins to boil and Figure 3b shows readings taken after 5 minutes and 45 seconds.

Figure 3a. Initial Readings

Figure 3b. Readings after 5 minutes and 45 seconds

Convert the time recorded in Figure 3b to seconds.

Calculate the mass of water evaporated in the experiment.

The power of the electric heater used in the experiment was 100 W. Assuming no heat was lost to the surroundings, calculate the specific latent heat of vaporization of water, $L_v$.

Define the term 'energy' and state its SI unit.

Complete Table 3 to show the MAIN form of energy associated with EACH of the following examples.

TABLE 3

State the MAIN energy conversions taking place when a flashlight is turned on.

Figure 4 shows a pendulum of mass 0.5 kg oscillating in a vacuum. X is the lowest position of the pendulum, where its maximum speed is $1.8 \text{ ms}^{-1}$.

Figure 4. Simple pendulum

Calculate the maximum kinetic energy of the pendulum.

Use the principle of conservation of energy to find the maximum gravitational potential energy of the pendulum.

Calculate the greatest height, $h$.

The 2011 Fukushima nuclear disaster raised questions about the wisdom of utilizing nuclear power. State TWO arguments for and TWO arguments against the use of nuclear fission reactors.

Arguments for 1. 2.

Arguments against 1. 2.

Nuclear fusion is seen as the great energy hope of the future. State TWO advantages of nuclear fusion over nuclear fission.

Correctly complete the following nuclear fusion reaction.

$\text{}^{2}\text{H} + \text{}^{3}\text{H} \longrightarrow \text{}^{4}\text{He} + \text{}^{1}\text{n}$

A commonly used fusion reaction is

$\text{}^{2}\text{H} + \text{}^{3}\text{H} \longrightarrow \text{}^{4}\text{He} + \text{}^{1}\text{n}$

The mass of the reactants and products for this reaction are recorded in Table 4 below.

TABLE 4

$u = 1.66 \times 10^{-27} \text{ kg}$ $c = 3.0 \times 10^{8} \text{ ms}^{-1}$

Newton and Huygens were two of the scientists who made significant contributions to the modern view of light as embracing both a wave and particle nature. State what evidence each proposed and whether this evidence supported the wave theory or particle theory.

Newton..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................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and the diagram below, answer the questions that follow.

Figure 5. A diagram of a homemade projector

(i) Suggest, with a reason, an appropriate distance from the lens, at which the phone should be placed in order to get a magnified image on an external screen.

If the phone is placed 20 cm from the lens, calculate the distance the screen must be placed from the lens in order to obtain a clear image of the phone.

Calculate the magnification of the image on the external screen formed in (b) (ii).

If the dimensions of the phone screen are $11.0 \text{ cm} \times 6.0 \text{ cm}$, calculate the dimensions of the image of the phone screen on the external screen.

State whether the image formed in (b) (ii) is upright or inverted.

Suggest one way in which the image formed in (b) (ii) can be made larger.

Figure 6 shows the magnetic field between the poles of a strong magnet.

Complete the following diagrams to show (i) the magnetic field due to a current carrying conductor where the current is directed into the plane of the paper

the resulting magnetic field when the current carrying conductor in (a) (i) is placed between the poles of the magnet, as shown in Figure 6.

Figure 7 shows the end view of a simple d.c. motor.

Figure 7. Diagram of a simple d.c. motor

Name the part labelled X.

Explain what happens when the switch is closed. Your answer should include the direction of the current, the forces acting, any rules applied, the direction of rotation and how continuous rotation is achieved.