H B621/02 GENERAL CERTIFICATE OF SECONDARY EDUCATION GATEWAY SCIENCE SCIENCE B UNIT 1: Modules B1 C1 P1 (Higher Tier) TUESDAY 15 JANUARY 2008 Afternoon Time: 1 hour *CUP/T45720* Candidates answer on the question paper. Additional materials (enclosed): None Calculators may be used. Additional materials: Pencil Ruler (cm/mm) INSTRUCTIONS TO CANDIDATES • • • • • • • Write your name in capital letters‚ your Centre Number and Candidate Number in the boxes above. Use blue or black ink. Pencil may
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I. INTRODUCTION Today‚ every country draws its energy needs from a variety of sources. We broadly classified this source as conventional and non conventional. 1.1] CONVENTIONAL SOURCES 1) Fossil fuels‚ 2) Hydroelectric power‚ 3) Nuclear fission‚ 1.2] NON-CONVENTIONAL SOURCES 1) Solar energy‚ 2) Wind energy‚ 3) Bio mass and bio gas‚ 4) Ocean thermal energy‚ 5) Tidal energy‚ 6) Geothermal energy. Energy is the prime mover of economic growth and is vital to the survival of a modern economy
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with those of the dermis. The main functions of the skin are protection of the tissues and organs that lie beneath against bumps and shocks‚ prevents entry of microorganisms and controls entry of foreign materials‚ protects the body from harmful radiation from the sun‚ controls water loss and regulates heat loss from the body and transmits social and sexual signals to others. However this essay will demonstrate how some of these different functions of the skin contribute to the maintenance of homeostasis
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Molecular model c. Evaporation d. Pressure changes 2.2 Thermal properties a. Thermal expansion of solids‚ liquids and gases b. Measurement of temperature c. Thermal capactiy d. Melting and boiling 2.3 Transfer of thermal energy a. Conduction b. Convection c. Radiation d. Consequences of energy transfer Properties of waves‚ including light and sound 3.1 General wave properties 3.2 Light a. Reflection of light b. Refraction of light c. Thin converging lens d. Dispersion of light e. Electromagnetic
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Energy Management and Audit Report 1) Introduction For over the past few years‚ the planet Earth is being damaged by human activities. Buildings play a major role in that. They contribute to approximately 40% of the greenhouse gas emissions globally. Over the past 30 years‚ 10% of the ice burgs have been melted due to the rising temperature of Earth. The rise in temperature is caused by greenhouse gas. Therefore‚ green building is important today. Green building has both positive and negative
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IB Thermal Physics MCQ questions ( Higher) 1. Thermal energy is transferred through the glass windows of a house mainly by A. conduction. B. radiation. C. conduction and convection. D. radiation and convection. 2. The first law of thermodynamics may be expressed in terms of the quantities below. DU‚ the increase in the internal energy of the system Q‚ the energy transferred to the system by heating W‚ the work done on the system Which one of the following is a correct statement
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of light either as a glow or flame and heat. Some of the heat energy is radiated back into the fuel‚ releasing more fuel to allow the combustion process to continue. Conduction The transfer of heat energy by the movement of the heat-agitated atoms colliding with each other‚ transmitting some of the energy or heat. Convection The movement of heat energy by the agitation of air molecules reduces the density of molecules making heated air lighter than cooled air. In a heated enclosed compartment
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raise the heat loss mechanism starts one or two things: “dilation of cutaneous blood vessels or enhanced sweating.”(Marieb 833) “Dilation of cutaneous blood vessels is where the vessels swell with warm blood‚ heat is lost from the radiation‚ conduction‚ and convection” (Marieb 833) Some symptoms for a heat stroke are “throbbing headache‚ dizziness and light-headedness‚ lack of sweating despite the heat‚ red hot skin‚ muscle weakness or cramps‚ nausea and vomiting‚ rapid heartbeat‚ which may either
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following is the best conductor for electricity? A. Distilled water B. Salt water C. Tap water D. Rain water A sprayer works on the principle expounded by A. Newton B. Archimedes C. Boyle D. Pascal Cloudy nights are warmer because A. clouds prevent radiation of heat from the ground into the air B. of low atmospheric pressure C. of the compact density of air D. more dust particles gather in the air A moving body on earth ordinarily comes to rest by itself because of the A. law of inertia B. force of friction
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AIR POLLUTION [pic] Introduction The earth’s atmosphere‚ at or near sea level‚ consists approximately of 78 percent nitrogen‚ 21 percent oxygen and 1 percent other gases. If it were possible to remain in this state‚ 100 percent clean air would result. However‚ many varied sources allow other gases and particulates to mix with the clean air‚ causing our atmosphere to become unclean or polluted. Some of these pollutants are visible while others are invisible‚ with each
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