Review: Physics

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Review Physics

• 1st term

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Question 1 Which material(s) can NOT be
magnetized?

• copper (Cu)
• nickel (Ni)
• iron (Fe)
• cobalt (Co)

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Question 2 Where is the magnetic force
strongest?

• At the poles.
• In the centre.
• On top.
• It's equally strong everywhere.

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Question 3 How can you demagnetize a magnet?

• by rubbing it.
• by heating it.
• by shaking it.
• by colouring it.

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Question 4 What can be used to show the
magnetic field?

• compass needles
• paper scraps
• aluminium
• iron filings

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Question 5There is no such thing as...

• a magnetic field.
• a magnetic monopole.
• an electromagnet.
• a permanent magnet.

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Question 6Which animals do NOT have a magnetic
sense?

• elephants
• sharks
• pigeons
• migratory birds

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Question 7Where does magnetism come from?

1. from the adhesive forces between molecules.
2. from the protons attracting neutrons.
3. from the electrons moving around the atomic
   nucleus.
4. from electric current.

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Question 8How can you magnetize a piece of
steel?

• by placing it near a magnet.
• by rubbing it with one end of a magnet.
• by heating it.
• by placing it in a coil of wire and pass current
  through the coil.

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Question 9The magnetic field of a
current-carrying coil is similar to...

• the magnetic field of a current-carrying wire
• the magnetic field of a ring magnet
• the magnetic field of a bar magnet
• the magnetic field of a horseshoe magnet

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Question 10The experiment that showed that
every electric current produces a magnetic field
was conducted by...

• Isaac Newton
• Michael Faraday
• Hans Christian Ørsted
• Albert Einstein

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Question 11What do you need to build an
electromagnet?

• a volt meter
• a wire
• a power supply
• an iron core

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Question 12In which device is there no
electromagnet?

• electric bell
• electric motor
• compass
• loud speaker

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Question 13In order to keep an electromotor
rotating after half a turn you need...

• a turbine.
• a coil.
• a commutator.
• a dynamo.

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Question 14A generator converts...

• electric energy into kinetic energy.
• radiant energy into electric energy.
• dinetic energy into radiant energy.
• kinetic energy into electric energy.

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Question 15 Which physical principle does a
generator use?

• law of conservation of energy
• induction
• magnetism
• refraction of light

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Question 16Which of the following is a DC
source?

• power socket
• battery
• solar cell
• accumulator

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Question 17What is the frequency of AC current
in the mains in Europe?

• 100 Hz
• 100 Volts
• 50 Hz
• 230 Volts

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Question 18A device for converting current and
voltage is called...

• transformer.
• generator.
• uniformator.
• transistor.

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Question 19An efficient power plant makes use
of...

1. power-heat-coupling.
2. current-heat-coupling.
3. force-current-coupling.
4. light-current-coupling.

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Question 20A renewable energy resource is...

1. coal
2. wood
3. oil
4. gas

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Question 21Which is NOT a greenhouse gas?

1. methane
2. oxygen
3. CFCs
4. carbon dioxide

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Question 22An advantage of nuclear power plants
is the fact that...

• they use renewable energy resources.
• they can be built in a short period of time.
• they do not emit CO2.
• all of the garbage can be recycled.

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Question 23Wood is called CO2-neutral because

• it is a natural energy resource.
• it takes up as much CO2 when growing as it emits
  when burned.
• it does not emit CO2 when growing.
• burning it does not emit greenhouse gases.

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CONGRATULATIONS!!!!!