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Student exam questions Question 1 • Out of nuclear power stations and coal fired stations, which produces more CO2 ? • Answer: Coal fired Question 2 • Which heart and blood vessles are part of which body system ? • Answer: The circulatory system Question 3 • What 2 particles are found in the centre of an atom? • Answer: Protons and Neutrons Question 4 • An element consists of a) b) c) d) One type of atom Two or more atoms A group of electrons None of the above Answer: A Question 5 • In all chemical changes: a) b) c) d) Atoms are rearranged to form new substances New atoms are formed Atoms are destroyed Mass is lost Answer: A Question 6 • Atoms with the same number of protons belonging to the same element is called an ? • Answer: Isotope Question 7 • Balance the following equation CH4 + ? O2 CO2 + ? H2O Answer: CH4 + 2 O2 CO2 + 2 H2O Question 8 • Ionic is a non metal and a metal bonding, covalent is bonding by 2 non-metals State which is a ionic and covalent bonding a) Carbon + Oxygen = Carbon Dioxide CO2 b) Sodium + Flurine = Sodium Fluride NaF Answer: a) covalent b) ionic Question 9 • What 2 gases contribute to the green house effect the most? a) Oxygen + Nitrogen b) Nitrogen + Methane c) Methane + Carbon Dioxide d) Carbon Dioxide + Oxygen Answer: c Question 10 • What is it called when two plates collide into each other and oceanic plate dives underneith continental plate? • Answer: Subduction zones Question 11 • The build up of chemicals in animals over time is ? a) Photosynthesis b) Bioaccumulation c) Biomass d) Biogas Answer: b Question 12 • If the speed of light is 300, 000 kilometres per second and the moon is 384 403 from earth. How long does it take for light reflected off the moon to reach earth? Answer: speed = distance/time time = distance/speed t = 384,403 km/300,000 km/s = 1.3 seconds (approx) Question 13 • Which of the following causes mid ocean ridges and rift valleys ? a) Transform fault zones b) Spreading zones c) Collision zones d) None of the above Answer: b Question 14 • Ohm’s Law states that: Voltage + current x resistance (V=IR) Find the voltage used when a resistor of 10 Ohm’s has a current of 2A flowing through it Answer: V=IR = 2x10 = 20 volts