CSEC Integrated Science Paper 2 May/June 2010 - Free CXC Past Paper with Answers

Name TWO household pests that may be present in the dining room if it is habitually left overnight as in Figure 3 and give a reason for the presence of these pests.

Pest 1: Reason:

Pest 2: Reason:

Describe ONE way in which the pests named in (a) affect humans.

Give TWO methods for controlling household pests.

Mosquitoes are carriers of dengue fever in many Caribbean Countries. Figure 4 shows the Smiths' backyard. Identify ONE object which may encourage the breeding of mosquitoes.

There is no medicine to treat the virus that causes dengue fever. Suggest ONE way that the Smiths may assist in reducing the incidence of dengue fever.

Name TWO other diseases spread by mosquitoes.

Water from rainfall is collected from the roof in containers. Name TWO impurities that may be present in this water.

Suggest TWO ways by which Mrs. Smith can make the water collected in the containers safe for drinking.

Sophia hopes to become a member of the national swimming team. Her coach encourages her to do weightlifting, aerobics and running.

What is the effect of weightlifting on the muscles of the body?

Suggest ONE benefit of aerobics and running that CANNOT be gained from weightlifting.

The coach has recommended that Sophia eats more lean meats, peas, rice and sweet potatoes. What are the TWO food groups in her new diet?

State ONE function of EACH of the food groups named in (b) (i) above.

Give ONE reason for EACH of the following:

Sophia breathes faster when she is running.

Sophia's heart beats faster when she exercises.

Sophia’s father, Mr. Pierre, decides to support her by joining in her exercises. Name ONE physical factor, other than fitness, which he must consider. Give ONE reason for your answer.

After one month, the amount of fat around Mr. Pierre’s waist decreased. Explain how this fat was used by his body.

Some athletes take performance enhancement drugs such as steroids which may result in their disqualification and ban from competition. What are THREE possible negative effects on Sophia’s body if she uses steroids?

Identify the group member with the MOST stable equilibrium and state TWO reasons for your answer.

Group member: Reasons:

Complete rows (i), (ii) and (iii) in Table 1 to show the correct stimulus, sense organ or major coordinating role during the rehearsal.

TABLE 1: STIMULUS, SENSE ORGAN AND COORDINATING ROLE

Energy occurs in different forms and is used in different ways. To carry out their activities, each group member requires energy. Explain how energy is obtained and used in producing their movements.

Label parts L and M on Figure 6, the internal structure of the eye shown below.

Jenny’s grandmother holds the newspaper at arm’s length when reading it.

What is the most likely cause of this condition?

State TWO ways of correcting this defect.

While preparing for her examinations, Jenny has been reading late into the night. What is ONE precaution that she can take to prevent damage to her eyes?

(i) What is the function of an electricity meter?

What is the reading on the meter shown in Figure 7?

The reading of the meter on 01 June 2008 was 22 943 kWh. Calculate the amount of electricity used during the month of June.

The power company determines that the cost of electricity is 70 cents for every kWh of energy used. Calculate the cost of electricity for the month of June.

Table 2 below lists the wattage of some household items.

TABLE 2: WATTAGE OF HOUSEHOLD ITEMS

Complete Table 2 to show the missing values at (a) and (b).

State THREE measures which the family of this household can implement to reduce energy consumption.

Which of the following is the most cost effective: using the fan for twelve hours instead of six hours OR using the toaster oven for two hours? Explain your answer.

Distinguish between a 'switch' and a 'fuse'.

Some homes in the Caribbean are powered by solar energy. State the energy changes that take place in these homes when an electric toaster oven is used.

Explain the concept of the conservation of linear momentum.

Figure 8 shows a trolley of mass 20 kg, moving at a speed of 2 metres per second (2m/s). The trolley collides with a stationary toy truck of mass 10 kg.

Figure 8. Diagram to show collision of a trolley with a truck

State TWO possible results of this collision.

Calculate the momentum of the truck if it was moving at a speed of four metres per second (4 m/s) towards the trolley.

State TWO possible results of the collision between the truck moving at the speed in (b)(ii) and the trolley.

Define the term 'energy' and state the unit of energy.

Energy is

The unit of energy is

What is the symbol for the unit of energy?

State the forms of energy present (i) before, (ii) during and (iii) after the trolley collides with the stationary toy truck.

(i) Before

(ii) During

(iii) After

The toy truck possesses gravitational potential energy. Explain where this energy comes from.