1) 2 .Where are genes found? a) cell membrane b) mitochondria c) vacuole d) chromosomes 2) zinc is ________ a) cat ion b) element c) compound d) non metal 3) coal, oil and natural gas is _____ a) nuclear fuel b) non fossil fuel c) alternative fuel d) fossil fuel 4) A catalyst is a substance that changes the_____ of reaction a) speed b) volume c) colour d) size 5) The long-term warming of the planet's overall temperature is_____ a) green house b) heating c) global warming d) riveting 6) Increasing livestock farming ,burning of coal and deforestation are the causes of______ a) pollution b) global warming c) all are correct d) increase in green house gases 7) The two parts join together with the help of the rivet is known as the _________ process. a) metalling b) welding c) joining d) riveting 8) When most of the atoms on the same metal surface are oxidized, damaging the entire surface, the process is ____ a) rusting b) oxidation c) corrosion d) reduction 9) Rusting occur only in iron and steel. a) True b) false c) some time d) none 10) Formula of pressure is ______ a) P=F/A b) P=D/A c) P=A/F d) P=F*A 11) When oxygen combines with an element or compound is known as _______ a) Reduction b) redox c) fermentation d) Oxidation 12) __________ is the loss of oxygen. a) Reduction b) redox c) fermentation d) Oxidation 13) A reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat a) Burning b) combustion c) exothermic d) All are correct 14) Energy is gained by splitting apart heavy atoms is known as ___________ a) fusion b) fission c) oxidation d) none 15) When CaCO3 breaks it porduces ________ a) CaCO + O 2 b) CaCO 2 + O c) CaO + CO d) CaO + CO 2 16) __________ is a device that measures altitude, the distance of a point above sea level. a) barometer b) speedometer c) altimeter d) neurometer 17) A barometer is a scientific instrument used to measure ________ a) DISTANCE b) atmospheric pressure c) barrier d) volume 18) The lowest temperature that is theoretically possible is absolute zero and its value is_____ a) -273 degree celsius b) 0 degree Celsius c) 273 celsius d) -273 degree Fahrenheit 19) Which chemical elements do all hydrocarbons contain? a) hydrogen and carbon b) hydrogen and oxygen c) carbon and oxygen d) hydrogen and sulphur 20) Sulphur is an example of: a) an element b) a compound c) a metal d) a mixture 21) What units do we use to measure pressure? a) newtonmetres b) pascals c) metres d) newtons 22) What pressure is created when a force of 500 N is applied over an area of 25 m2 a) 12,500 Nm b) 2500 Pa c) 20 Nm d) 20 Pa 23) High-heeled shoes are banned from certain types of floor because a) they are not fashionable b) the wearer can easily fall over c) they may damage the floor d) it is not easy to dance in them 24) The pressure of a liquid: a) is the same everywhere b) increases with depth c) is caused by air pressure d) is greatest from above 25) What name is given to a device which automatically controls the temperature a) transistor b) thermostat c) thermometer d) thermocline

science VIII

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