STTSS S2 08 EST Est Spmtrial p2(07)

8/14/2019 STTSS S2 08 EST Est Spmtrial p2(07)

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PAPER 2

SECTION A[25 Marks]

You are advised to spend 50 minutes on this section.Questions 1-25

For each for the questions in this section, blacken the answerA, B, C, orD on the

Answer Sheet provided.

Question 1

Read the text below carefully and answer the question that follows.

In a movie theater, the reason why you wear 3-D glasses is to feed different images

into your eyes. The screen actually displays two images, and the glasses cause one of

the images to enter one eye and the other to enter the other eye. In red and blue or

green system, two images are displayed on the screen, one in red and the other inblue(or green). The filters on the glasses allow only one image to enter each eye, and

your brain does the rest.

1. To have a 3-D effect, a pair of 3-D glasses depend on

A. several images showing on the screenB. different coloured images appearing on the screen

C. different coloured glasses that accept all images

D. our brain to filter the different coloured glasses

Question 2Read the text below carefully and answer the question that follows.

The MP3 format is a compression system for music. The MP3 format helps reduce the

number of bytes in a song without hurting the quality of the songs sound. The goal of

the MP3 format is to compress a CD-quality song by a factor of 10 to 14 without

noticeably affecting the CD-quality sound.

2. From the text, we can conclude thatA. the quality of song will be affected in MP3

B. the compression system is still not efficient

C. MP3 is able to store more songs than CDs

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Questions 3-4

Read the text below carefully and answer the questions that follow.

Optical sensing gives a computer the capability of reading printed characters.

Reflected or transmitted light from the character strikes an array of photoelectric cells,

which effectively dissect it into light and dark areas. By analysis of these areas the

computer is able to recognize the character, with some tolerance for less than perfectand uniform printing.

3. To read printed characters, optical sensing responds toA. reflected light

B. striking array

C. photoelectric cells

4. Optical sensing is a device in a computer to allow computer toA. identify different pictures

B. respond to transmitted light

C. discard photoelectric cells

D. allow for imperfect printing

Questions 5-6


During the transmission through facsimile machine, a document is broken down into

pixels. This is accomplished by reflecting the image of the document being scanned

through a lens which is focused to a CCD (charged coupled device). The CCD converts

the image into different levels of electrical current based on the intensity of light of

each picture element. This process is called photoelectric conversion. The electrical

signals are then modulated and sent over the phone line.

5. We can conclude that facsimile transmission requiresA. a paper breaking facsimile machine

B. a scanner to scan images

C. different intensity of lightD. a telecommunication cable

6. Which of these procedures show the correct sequence for images to be transmitted

through a facsimile machine?

A. images turned pixels scanned by lens modulated converted into electrical

current

sentB. images turned into pixels scanned by lens converted into electrical current

modulated sent

C. images turned into pixels converted into electrical current modulated

scanned by lens sent

D. images turned into pixels modulated converted into electrical current

scanned by lens sent

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Questions 7-8


Many mountain ranges influence deserts because they are very tall and wide. They do

not let much rain get into the desert. Wind is also another way deserts form. The wind

that blows in the desert comes from far away waters. As it travels, the moisture leaves.By the time any wind reaches the deserts, it is very dry. Wind also helps in the

formation of sand dunes.

7. Mountains contribute to the forming off desert byA. maintaining their height and width

B. blocking rain into certain areas

C. causing strong winds to blow away water

D. distancing certain areas from rivers.

8. Which of the following statements best describe how wind helps in the formation of

desert?

A. The strong wind removes moisture from the desertB. The speed of wind affects the formation of desert

C. The wind increases speed as it reaches the desertD. The wind brings in sand from other places

Question 9


Roadrunner or Geococcyx californianus is a well-known desert resident. The greater

roadrunner has adapted to life on the run. Though it can fly well, it prefers to use its

strong legs and X- shaped toes to run rapidly over the desert landscape. Active

predators, roadrunners aggressively chase insects, lizards, snakes, small birds and

mammals.

9. Based on the text above, which of the following statements is true?

A. Roadrunner is a birdB. Roadrunner prefers flying

C. Roadrunner is an herbivore

D. Roadrunner hunts with its x-shaped toes

Question 10


Water is one of the prime promoters of chemical activity. Besides causing metals to

rust and corrode, and rocks to decay into soil, it has tremendous and widespread

effect on climate through ocean currents which acts as distributors of the earths

heat. Through its remarkable ability to change its state, water continually rises as

vapour from the sea and then condenses to fall on the land as rain.

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10. What are the main functions of water?

I Change the climateII Corrode metals

III Form soil

IV Create rain

A. I, II and III

B. II, III and IVC. I, III and IV

D. All of the above

Question 11


Mobile phones are small radio transmitters. They create an electric field when they

are used, and this can disturb sensitive equipment nearby, such as an aeroplanesnavigation and control systems. Hospital equipment heart monitors and kidney

dialysis machines for example can also be affected. Since they send and receive

signals even on standby mode, mobile phones should always be switched off

completely in aircraft and hospitals.

11. Based on the text, which of the following statements is true?

A. Mobile phones can affect a persons heartbeat.B. Mobile phones can spoil dialysis machines and heart monitors.

C. Mobile phones can damage the control system of an aeroplane.

D. Mobile phones can interfere with an aeroplanes navigation readings.

Question 12

Read the text below carefully.

Butanol or butyl alcohol is an alcohol with a 4 carbon structure and the molecular

formula of C H O. It is primarily used as a solvent, as an intermediate in chemical

synthesis and as a fuel.

12. Which of the following would complete the statement below?Butanol has 4 carbon atoms and ____________ hydrogen atoms.

A 4

B 1C 10

D None

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Question 13


Time is measured in terms of the S.I. unit of the second (s), minute (min.) hour (h),day, month, year, decade and century. The duration of one second is based on the

precise frequency of oscillation within caesium atoms which has an error of only 1

second in 300 000 years.

13. How do we know that the measurement of second(s), as stated in the text, is

accurate?

A. Error of only 1 day in 300 000 yearsB. Error of only 1 hour in 300 000 years

C. Error of only 1 minute in 300 000 years

D. Error of only 1 second in 300 000 years

Questions 14 & 15

The weather patterns in our environment depend on the geographical location of the

particular area. Places that are further away from the Equator experience the four

seasons: spring, summer, autumn and winter. Different types of flora and fauna thrive

in specific conditions and cannot live in extreme weather. For example, the orang-utan

can only be found in tropical jungles rather than in temperate forests .

14. The determining factor in ensuring the survival of specific living beings depends on

A. the specific location of a particular area.

B. the specific weather changes of a particular area.

c. the specific location of a particular area at the Equator.

15. Temperate forests are locatedA. closer to the Equator.

B. farther from the Equator.

C. within the Equatorial belt.

Question 16

Diseases of tomatoes include wilts, leaf spots, fruit spots or rots. Most tomato

wilts are caused bysoil-borne bacteria and fungi.

16. Which of the following will explain the term soil-borne bacteria?

A. Bacteria that live in the soil.B. The soil that breeds bacteria

C. Bacteria spreads soil diseases.

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Questions 17 & 18

Read the text below carefully and answer the following questions.

The sun is the biggest star in the universe and is the central provider of energy for

all living beings in the galaxy. Using solar energy to generate power is a more

environmentally friendly alternative. However, the technology being used at presentis not efficient enough for global use in a more cost effective way. Thus, a proposal to

use giant solar modules attached to geostationary Earth orbit satellites that would

generate electric power harnessed from the sun is a system that would most

probably be the best step towards eliminating the use of fossil fuels that cause

pollution.

17. Which of the statements below is incorrect?

A. Generating power using solar energy is environmentally friendly.B. Solar energy is a better alternative to fossil fuels but is limited at present.

C. Solar energy harnessed from the sun is the cause of fossil fuel pollution.

D. The new proposal to maximize the collection of solar energy involves satellites.

18. From the text, it can be best concluded that

A. the sun is the central provider of energy in the universe.

B. fossil fuels is still the best option for energy at present.C. solar energy is the only source of energy that is cost effective.

D. the future of generating energy lies in maximizing solar energy.

Question 19

Worlds Largest Dams by Power Generation Capacity

Ranking Name of Dam Location/Country

1 Itaipu Brazil/Paraguay2 Guri Venezuela

3 Grand Coulee United States of America

4 Sayano-Sushensk Russia

5 Krasnoyarsk Russia

6 La Grande 2 Canada

7 Churchill Falls Canada

8 Bratsk Russia

9 Ust-Ilim Russia

10 Tucurui Brazil

19. Which of the following statement is true based on the information given in the tableabove?A. Brazil is the only country that shares its hydroelectric energy.

B. Brazil and Paraguay are the leading countries in hydroelectric production.

C. Canada produces more hydroelectric energy than the United States of America.D. Russia and Brazil are the leading countries that utilize hydroelectric energy.

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Question 20


Your weight on the moon would be approximately one sixth of your

weight on earth due to the effect of gravity.

20. If your weight on earth is 66 kilograms, your weight on the moon would beA. 11 kilograms. C. 106 kilograms.

B. 66 kilograms. D. 396 kilograms.

Question 21

A star is a body that at some time in its life generates its light and heat by

nuclear reactions, specifically by the fusion of hydrogen into helium under

conditions of enormous temperature and density. When hydrogen atoms

merge to create the next heavier element, helium, mass is lost, the mass (M)

converted to energy (E) through Einsteins famous equation E = mc2, wherec is the speed of light.

21. What gives power to a star?

A. Loss of mass

B. Helium fusionC. Hydrogen fusion

D. High temperature

Question 22

Study the information carefully and choose the best option.

Symbol Element Melting Point Boiling Point

Ca Calcium 1115 K 1757 K

Mg Magnesium 923 K 1363 K

Ti Titanium 1941 K 3569 K

Zr Zirconium 2128 K 4682 K

Cr Chromium 2180 K 2944 K

Fe Iron 1811 K 3134 K

Au Gold 1377.33 K 3129 K

Si Silicon 1687 K 3538 K

Sb Antimony 903.78 K 1860 K

Br Bromine 265.8 K 332 K

22. Which of the following statements is true?

A. Iron has a higher melting point than Zirconium.B. Calcium has a higher boiling point than Titanium.

C. 75% of the elements in the table have a boiling point higher than 1000 K.

D. 70% of the elements in the table have a melting point higher than 1000 K.

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Question 23

Numerical system to classify the extent of occurrence of cancer.

Stage 0 Cancer in situ (limited to Surface

cells)

Stage I Cancer limited to the tissue of origin,evidence of tumour growth

Stage II Limited local spread of cancerous cells

Stage III Extensive local and regional spread

Stage IV Distant metastasis

23. What does it mean when a person is diagnosed with cancer in stage O?

A. The cancer cannot be treated.B. The tumour is growing on the surface cells.

C. The cancer has affected the surface cells only.

D. The cancer has affected the immediate surrounding cells.

Questions 24 25

24. Why does the smolt undergo a process called smoltification?

A. To allow it to reproduce C. To allow it to grow and mature

B. To allow it to live in saltwater D. To allow it to live in freshwater

25. Which of the following does not hunt for food?

A. Fry B. Smolt C. Alevin

Section B

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[5 marks]

Questions 26 30

Read the following passage and then circle the BEST answerA, B, CorD.

Acne is one of the most common of all skin problems today. Some of the more

common forms of acne include whiteheads, blackheads, pimples and cysts. Almosteveryone encounters ___(26)____ of acne at some stage of his or her life, but acne is

particularly ____(27)____ among teenagers. The main cause of acne in adolescents is the

____(28)____ production of hormones: oestrogen in young women and testosterone in

young men.The hormonal changes during puberty ____(29)____ the skins sebaceous glands to

enlarge and this may increase their output of an oily substance called sebum. A build-up

of sebum ____(30)_____ with bacteria, dead skin cells and other debris, clogs pores,leading to one or more forms of acne.

26. A. break in 29. A. trigger

B. break off B. moveC. breakouts C. set

27. A. common 30. A. fused

B. shared B. mixed

C. usual C. reacted

D. diffused

28. A. enlarged

B. extended

C. increased

D. developed

KERTAS SOALAN TAMAT Questions 26 30 are based on the following passage.

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The ozone layer is important because it absorbs ultraviolet (UV) radiation from

the sun, preventing most of it from reaching the Earths surface. Radiation in the UV

spectrum has wavelengths just shorter than those of visible lights. UV radiation with__26__ is between 280 and 315 nanometres. UV-B is damaging to almost all __27__ of

life. By absorbing most UV-B radiation before it can reach the Earths surface, the ozone

layer shields the planet from the radiation harmful effects. Stratospheric ozone also__28__ the temperature distribution of the atmosphere, thus playing a role in regulating

the Earths climate.

Impact of ultraviolet radiation on our health is notable. Ultraviolet radiationswhich will increase as a result of depletion of the stratospheric ozone layer has a number

of __29__ effects on human health including __30__ the risk of various forms of skin

cancer, weakening of the human immune system and causing eye disorders such as

cataract problems.

26. A rays 29. A. good

B light B. adverse

C spectrum C. positiveD wavelength D. unknown

27. A senses 30. A. declining

B forms B. improving

C sections C. increasing

D categories D. decreasing

28. A effectsB affects

C defects

D reflects

END OF QUESTION PAPER

ALL THE BEST OF LUCK!!!

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STTSS S2 08 EST Est Spmtrial p2(07)