CSEC Physics Paper 2 May/June 2019 - Free CXC Past Paper with Answers

Complete Table 2 by inserting the appropriate physical quantities and derived SI units.

TABLE 2: PHYSICAL QUANTITIES AND UNITS

Volume

kg $m^{-3}$

N

Pressure

Pressure

The concrete block shown in Figure 3 was made with cement.

Figure 3. Concrete block

Calculate the density of the concrete block, given that its mass is 20 160 kg.

Define the term 'pressure'.

Given that $g = 10$ N $kg^{-1}$, calculate the pressure exerted on the floor by the base of the concrete block.

Define the term 'heat capacity'.

Define the term 'specific latent heat of vaporization'.

A substance which has a freezing point of $80 \text{ }^{\circ}\text{C}$ was cooled from $90 \text{ }^{\circ}\text{C}$ to a total solid at its freezing point.

Sketch a graph on Figure 4 to represent the statement above.

Figure 4. Cooling curve

A student conducted an experiment in which $1.5 \text{ kg}$ of water at $30 \text{ }^{\circ}\text{C}$ was converted to steam at $100 \text{ }^{\circ}\text{C}$.

heat the water from $30 \text{ }^{\circ}\text{C}$ to $100 \text{ }^{\circ}\text{C}$

convert the water at $100 \text{ }^{\circ}\text{C}$ to steam at $100 \text{ }^{\circ}\text{C}$

heat the water from $30 \text{ }^{\circ}\text{C}$ to steam at $100 \text{ }^{\circ}\text{C}$.

SECTION B Answer ALL questions.

State THREE features of an image produced in a plane mirror.

Feature 1

Feature 2

Feature 3

Explain why the word $\boxed{\text{          }}$ is painted in this manner at the front of some emergency vehicles.

Figure 5 shows an incomplete ray diagram. Complete the ray diagram to show the path of the emerging ray after it passes through the lens.

Complete the ray diagram to show the path of the emerging ray after it passes through the lens.

On the diagram, label the focal length, $f$.

An object $AB$ was placed $15 \text{ cm}$ in front of a converging lens of focal length $5 \text{ cm}$. Calculate the

• image distance
• magnification of the image formed.

image distance

magnification of the image formed.

A semiconductor diode is used in a half-wave rectification. Using the axes on Figure 6, sketch the $I-V$ graph for the semiconductor diode.

Complete the truth table shown in Table 3 for a NAND gate.

TABLE 3: NAND GATE

Lithium $-7$ is an isotope of lithium. The mass number is $7$ and the atomic number is $3$. (i) Use the information given above to determine the number of protons and neutrons present in an atom of lithium $-7$. Protons 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Figure 8. Resistors in parallel

Calculate the equivalent resistance of the resistors in Figure 8.

Calculate the half-life of lithium.

Calculate the energy given off in a nuclear reaction if the change in mass is $0.2014\text{ u}$. ($1\text{ u} = 1.66 \times 10^{-27}\text{ kg}$, $c=3.0\times {10}^8{}^{}$)