CSEC Physics Paper 2 January 2019 - Free CXC Past Paper with Answers

State the factor on which EACH of the following characteristics of sound depends.

Pitch

Loudness

A sound wave completes three cycles in 6 ms. Calculate its frequency.

Figure 2 shows the side AB of a rectangular glass block and CD which is the normal at the point O.

Figure 2. Glass block

On Figure 2, draw the path taken by a ray of light which meets the glass–air boundary at the point O at an angle of incidence equal to the critical angle.

Label the incident ray, the critical angle and the refracted ray (path taken by the ray).

The glass block has a refractive index of 1.5. Determine the value of the critical angle of the glass.

The ray of light now meets the glass-air boundary at the point O at an angle of incidence greater than the critical angle. On Figure 3, draw a diagram to show the new path taken by the ray of light.

Figure 3. Glass block

State the law of conservation of energy.

A goalkeeper drops a football of mass $0.43 \text{ kg}$ vertically downwards from rest at a height of $1.5 \text{ m}$.

Calculate the velocity of the ball as it makes contact with the ground. (Assume no air resistance or wind is present.)

[Acceleration due to gravity, $g=10 \text{ ms}^{-2}$]

Define the term 'force'.

Many types of forces are applied in various situations.

Complete Table 2 by inserting the appropriate types of forces and examples.

TABLE 2: TYPES OF FORCES AND EXAMPLES OF WHERE THE FORCES ARE EXPERIENCED

A class of Physics students conducted a School-Based Assessment on the relationship between force (F) and extension (e) for a rubber band.

One of the groups produced the following graph from the results.

Figure 4. Graph of Force (F) against extension (e)

State the mathematical relationship between force and extension in the segment OA.

State the point at which the elastic limit is located.

Give a reason for the shape of the segment AB in the graph.

Explain what is meant by the term 'the specific latent heat of vaporization of water'.

Calculate the heat energy required to convert 8 kg of water at $100 \text{ }^\circ\text{C}$ to steam at $100 \text{ }^\circ\text{C}$.

(Specific latent heat of vaporization of water / $L_v = 2 \text{ }300 \text{ }000 \text{ Jkg}^{-1}$)

Define the pressure law.

The initial pressure of a sample of gas is $3 \text{ Pa}$, the final pressure is $9 \text{ Pa}$, while its volume remains unchanged.

If the initial temperature of the gas was $27 \text{ °C}$, calculate the final temperature of the gas.

What is the purpose of the fuse in a circuit?

What is the purpose of the earth wire in a circuit?

State TWO reasons why appliances are connected to the circuit in parallel.

Figure 5 shows a circuit diagram.

Figure 5. Circuit diagram

Use the circuit diagram in Figure 5 to determine

the TOTAL resistance in the circuit

the TOTAL current in the circuit.

Which fuse, a 2A fuse, a 3A fuse or a 4A fuse, is the most suitable to use in the circuit shown in Figure 5?

Complete Table 3 below to show the properties of the THREE types of radioactive emissions.

TABLE 3: PROPERTIES OF RADIOACTIVE EMISSIONS

Complete the following nuclear equations. (i) $_{6}^{14}\text{C} \longrightarrow {7}^{14}\text{N} + \boxed{\phantom{X}} $ (ii) ${88}^{226}\text{Ra} \longrightarrow _{86}^{222}\text{Rn} + \boxed{\phantom{X}} $

${6}^{14}\text{C} \longrightarrow {7}^{14}\text{N} + \text{__}$

${88}^{226}\text{Ra} \longrightarrow {86}^{222}\text{Rn} + \text{__}$

A radioactive sample had an initial count of 1000 as measured on a Geiger–Müller counter.

After 15 hours, the count rate was 250. Calculate the half-life of the sample.