Review: Physics 1st term Question 1: Which material(s) can NOT be magnetized? a) copper (Cu) b) nickel (Ni) c) iron (Fe) d) cobalt (Co) Question 2: Where is the magnetic force strongest? a) At the poles. b) In the centre. c) On top. d) It's equally strong everywhere. Question 3: How can you demagnetize a magnet? a) by rubbing it. b) by heating it. c) by shaking it. d) by colouring it. Question 4: What can be used to show the magnetic field? a) compass needles b) paper scraps c) aluminium d) iron filings Question 5: There is no such thing as... a) a magnetic field. b) a magnetic monopole. c) an electromagnet. d) a permanent magnet. Question 6: Which animals do NOT have a magnetic sense? a) elephants b) sharks c) pigeons d) migratory birds Question 7: Where does magnetism come from? a) from the adhesive forces between molecules. b) from the protons attracting neutrons. c) from the electrons moving around the atomic nucleus. d) from electric current. Question 8: How can you magnetize a piece of steel? a) by placing it near a magnet. b) by rubbing it with one end of a magnet. c) by heating it. d) by placing it in a coil of wire and pass current through the coil. Question 9: The magnetic field of a currentcarrying coil is similar to... a) the magnetic field of a current- carrying wire b) the magnetic field of a ring magnet c) the magnetic field of a bar magnet d) the magnetic field of a horseshoe magnet Question 10: The experiment that showed that every electric current produces a magnetic field was conducted by... a) Isaac Newton b) Michael Faraday c) Hans Christian Ørsted d) Albert Einstein Question 11: What do you need to build an electromagnet? a) a volt meter b) a wire c) a power supply d) an iron core Question 12: In which device is there no electromagnet? a) electric bell b) electric motor c) compass d) loud speaker Question 13: In order to keep an electromotor rotating after half a turn you need... a) a turbine. b) a coil. c) a commutator. d) a dynamo. Question 14: A generator converts... a) electric energy into kinetic energy. b) radiant energy into electric energy. c) dinetic energy into radiant energy. d) kinetic energy into electric energy. Question 15: Which physical principle does a generator use? a) law of conservation of energy b) induction c) magnetism d) refraction of light Question 16: Which of the following is a DC source? a) power socket b) battery c) solar cell d) accumulator Question 17: What is the frequency of AC current in the mains in Europe? a) 100 Hz b) 100 Volts c) 50 Hz d) 230 Volts Question 18: A device for converting current and voltage is called... a) transformer. b) generator. c) uniformator. d) transistor. Question 19: An efficient power plant makes use of... a) power-heat-coupling. b) current-heat-coupling. c) force-current-coupling. d) light-current-coupling. Question 20: A renewable energy resource is... a) coal b) wood c) oil d) gas Question 21: Which is NOT a greenhouse gas? a) methane b) oxygen c) CFCs d) carbon dioxide Question 22: An advantage of nuclear power plants is the fact that... a) they use renewable energy resources. b) they can be built in a short period of time. c) they do not emit CO2. d) all of the garbage can be recycled. Question 23: Wood is called CO2-neutral because a) it is a natural energy resource. b) it takes up as much CO2 when growing as it emits when burned. c) it does not emit CO2 when growing. d) burning it does not emit greenhouse gases. CONGRATULATIONS!!!!!