GCSE Science/Electricity multiple choice
A student rubs a polythene strip with fur and suspends it from a clamp stand. She then rubs another polythene strip with fur and brings it up to the first strip. The two strips repel each other.
Look at the following four statements:
- A) One of the strips is neutral, the other charged.
- B) The strips are both negatively charged.
- C) The strips are both positively charged.
- D) The strips are both neutral.
Which two of the above statements are false?
- A and B
- A and C
- A and D
- B and C
- B and D
- C and D
A student decided to silver plate his/her mother's forks. S/he set up the apparatus above. S/he set the power pack and variable resistor so that the ammeter read 0.1 A. S/he allowed the fork to remain in the electrolysis apparatus for 10 min. Once s/he removed the fork s/he tested it by trying to scratch the silver off. S/he found that the layer of silver was too thin and decided that s/he would have to take steps to make the layer a lot thicker.
Which one of the following steps would not produce a thicker layer of silver ?
- Increasing the voltage of the power pack
- Increasing the resistance of the variable resistance
- Increasing the time spent in the apparatus
- Increasing the concentration of the silver nitrate solution
What is the maximum power that an appliance should have if it is connect to a 230V supply by a 5A cable ?
- 1.15 kW
The graph above shows how the potential difference across a conductor varied with the current flowing through it. Which of the following statements is true ?
- The resistance of the conductor increases as the current increases
- The resistance of the conductor decreases as the current increases
- The resistance of the conductor stays constant as the current increases
- It is not possible to say anything about the resistance of the conductor based on the information given
Two students, Jane and John are working together to make an electromagnet. John coils some plastic coated wire around a pencil and attaches the two ends to a 1.5V cell. He finds the electromagnet that he has made will deflect a compass placed near it but will not pick up a paperclip.
Jane suggest that using an iron nail rather than a pencil will make the magnet stronger. Is she correct, and why?
- She is correct, the iron core will make the magnet stronger, because iron conducts electricity.
- She is correct, the iron core will make the magnet stronger because iron is a magnetic material.
- She is incorrect, the iron core will not make the magnet stronger, because iron conducts electricity.
- She is incorrect, the iron core will not make the magnet stronger because iron is a magnetic material.
Jane and John have made an electromagnet using a soft iron core with 10 windings of insulated copper wire and a voltage of 1.5V. They found that they could pick up 3 paper clips with this magnet if they were careful. Which of the following changes would not result in more paper clips being picked up?
- Increasing the voltage (and therefore the current).
- Using 15 turns of wire instead of 10.
- Reverse the connections to the battery so that the current flows in the opposite direction.
- Add a resistor in series with the electromagnet.
A photocopying machine creates a picture by making use of static electricity. Put the following statements about how the process works in the correct order.
- Paper is given an opposite charge to the toner and pressed onto the plate. This causes the toner to stick to the paper rendering a copy of the picture.
- A plate is given a charge, an image is projected onto the plate. Where the image was dark, a dark area forms on the plate.
- Particles of toner are sprayed over the plate and are attracted to the charged areas, but not the neutral areas.
- Light shining on the plate gives the charges enough energy to leak away. The dark areas of the plate stay charged.
- 1 2 3 4
- 3 2 1 4
- 4 2 3 1
- 1 3 2 4
- 1 3 4 2
- 2 1 4 3
- 2 4 3 1
- 2 4 1 3
(Don't see your order in among the options? Check again because the correct order is certainly in there).
What effect will increasing the current in the wire have ?
- There will be no effect because the magnets haven't been changed.
- The wire still moves upwards, but this time the greater current causes it to move more slowly.
- The wire will now move downwards.
- The wire will move upwards more quickly than before.
This is the same setup as in question 12.
What can be done to make the wire move downwards ? (Choose two methods from the list)
- increase the current
- reverse the current
- make the wire shorter
- reverse the magnetic field
External Question papers
- http://www.aqa.org.uk/qual/gcse/sci_da_m_assess.html Requires adobe acrobat viewer.