CSEC Physics Paper 2 May/June 2011 - Free CXC Past Paper with Answers

Complete Table 3 by inserting the correct symbol and SI Unit which relate to the quantity shown in Column 1.

TABLE 3

Define the term 'heat capacity of a substance'.

Write the equation that relates specific heat capacity with heat capacity.

A busy housewife left 25 g of ice in an open insulated container while she was answering her cellphone. When she returned, the ice at $0\ \degree\text{C}$ was converted to water at $3.0\ \degree\text{C}$.

A busy housewife left $25 \text{ g}$ of ice in an open insulated container while she was answering her cellphone. When she returned, the ice at $0 \text{ }^\circ\text{C}$ was converted to water at $3.0 \text{ }^\circ\text{C}$.

If this melting and heating activity took place over $300 \text{ s}$, calculate the rate at which the ice / water was receiving heat.

If this melting and heating activity took place over 300 s, calculate the rate at which the ice / water was receiving heat.

How does the flow of the current within the simple cell differ from that in a copper wire?

Name the material used for the positive terminal in a dry cell.

Name the material used for the negative terminal in a dry cell.

In the circuit in Figure 1, if the current is steady at $0.1 \text{ A}$, calculate the charge that goes through the copper wire in $60 \text{ s}$.

Determine how much charge goes through the simple cell in $60 \text{ s}$.

Identify the type of current (d.c. or a.c.) which generated the specific waveforms A, B and C shown in Table 4.

TABLE 4

<image: Table 4 shows three waveforms (A, B, C) plotted against time (t/s) and current (I/A). Waveform A is a positive half-cycle, Waveform B is a constant positive current, and Waveform C is a full sinusoidal wave.>

Determine the period and frequency for Waveform C.

Eron, a form five Physics student, has available to him a bright filament light in a ray box, an opaque screen with two closely spaced narrow slits, and a large white screen.

Describe how he can set up the apparatus to be able to observe an interference pattern of light and dark bands on the white screen and briefly explain why this pattern forms.

Figure 2 shows a narrow beam of white light which is shone onto a triangular prism at an angle of incidence of $30^\circ$.

(i) If the angle of refraction for the violet light, $\theta_v$, is $20^\circ$, what is the refractive index of this prism for violet light? (ii) Calculate the speed of the violet light in the prism. (iii) Calculate the frequency of violet light if the wavelength in air is $430 \text{ nm}$.

[1 nm = $10^{-9} \text{ m}$] [Velocity of light in air = $3.0 \times 10^8 \text{ m s}^{-1}$]

If the angle of refraction for the violet light, $\theta_v$, is $20^\circ$, what is the refractive index of this prism for violet light?

Calculate the speed of the violet light in the prism.

Calculate the frequency of violet light if the wavelength in air is $430 \text{ nm}$.

[1 nm = $10^{-9} \text{ m}$] [Velocity of light in air = $3.0 \times 10^8 \text{ m s}^{-1}$]

Many modern electrical appliances have been designed to operate with a.c. power rather than d.c. power because electrical power is transmitted as a.c. rather than d.c.

(i) State TWO advantages of using a.c. to transmit electrical power. (ii) Draw a diagram of a simple transformer indicating the features which enhance efficiency.

State TWO advantages of using a.c. to transmit electrical power.

Draw a diagram of a simple transformer indicating the features which enhance efficiency.

Electrical power produced by Powergen in Trinidad is stepped up from $11 \text{ 000 V}$ at $8 \text{ 000 A}$ to $110 \text{ 000 V}$ for transmission to Tobago.

(i) If the number of turns in the secondary coil is $900$, calculate the number of turns in the primary coil for an ideal transformer. (ii) Calculate the transmission current for the ideal transformer referred to at (b) (i). (iii) Calculate the transmission power if the transformer is $70%$ efficient.

If the number of turns in the secondary coil is $900$, calculate the number of turns in the primary coil for an ideal transformer.

Calculate the transmission current for the ideal transformer referred to at (b) (i).

Calculate the transmission power if the transformer is $70%$ efficient.

Outline THREE uses of radioisotopes in medicine.

State THREE safety precautions to be taken when using radioactive substances.

A gram of living plant material with Carbon-14, decays at a rate of about $16$ disintegrations per minute. When the plant dies, the Carbon-14 decays, with a half-life of $5,600$ years. A gram of the dead plant is found to decay at about $1$ disintegration per minute. Calculate the probable age of the plant.

The mass of the sun is lost at the rate of $2.0 \times 10^9\,\text{kg s}^{-1}$. If the speed of light in a vacuum is $3.0 \times 10^8\,\text{m s}^{-1}$, calculate the power output of the sun in kilowatts.